# 2018 in paleomalacology

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This list, 2018 in paleomalacology, is a list of new taxa of ammonites and other fossil cephalopods, as well as fossil gastropods, bivalves and other molluscs that are scheduled to be described during the year 2018, as well as other significant discoveries and events related to molluscan paleontology that are scheduled to occur in the year 2018.

## General research

* A study on the impact of the Paleocene–Eocene Thermal Maximum on the richness, turnover, or ecological structure of shallow marine molluscan faunas from the Gulf Coastal Plain, or on the body size, growth rate, or life span of component taxa, is published by Ivany et al. (2018).
* A study on the basal metabolic rate of Pliocene to recent bivalves and gastropods from the Western Atlantic is published by Strotz et al. (2018).
* A study evaluating how faithfully stratigraphic ranges of extant Adriatic molluscs are recorded in a series of cores drilled through alluvial, coastal and shallow-marine strata of the Po Plain (Italy) is published by Nawrot et al. (2018), who also evaluate the implications of their study for interpretations of the timing, duration and ecological selectivity of mass extinction events in general.

## Ammonites
### Research

* A study on the life history and habits of ammonites as indicated by measurements of their conchs is published by Walton & Korn (2018).
* A study on the life mode of ammonite hatchlings, as indicated by the oxygen and carbon isotope composition of the embryonic shells and early postembryonic whorls of five juveniles of Hoploscaphites comprimus from the Fox Hills Formation (South Dakota, United States), is published by Linzmeier et al. (2018).
* A study on the succession of latest Permian ammonite fossils in Iran is published by Kiessling et al. (2018), who interpret their findings as indicating that Permian–Triassic extinction event had a prelude leading to extinction pulses, a decline of body size and morphological simplification in latest Permian ammonites.
* A study on the distribution and abundance of Early Triassic ammonites from the western United States basin is published by Jattiot et al. (2018).
* A study testing whether the Rapoport effect can be observed among the early Pliensbachian ammonites from the area of the present-day Europe, the Middle East and North Africa is published by Zacaï et al. (2018).
* A study on the number of eggs laid by large adult females of Cretaceous ammonites and belemnites, as well as on the ecological niches occupied by juvenile ammonites and belemnites, is published by Tajika, Nützel & Klug (2018).
* Ammonite nuclei (earliest whorls), representing a rare case of preservation of very early ontogenetic stages of ammonites and indicating high juvenile mortality that is seldom recorded in the fossil record of this group, are described from the Cretaceous (upper Turonian to Coniacian) of Tanzania by Ifrim, Wendler & Lehmann (2018), who interpret their finding as indicating that the mating and spawning areas of ammonites were locally restricted, and that their earliest ontogenetic stages were probably distributed by currents passing by their mating and spawning areas, similar to extant coleoids.
* A study on the paleoecology of the ammonites belonging to the genera Baculites and Scaphites, as indicated by the intracolonial variance in the size of zooids of cheilostome bryozoans that colonized the internal body chambers of the shells of these ammonites once they settled to the seafloor following the death of the ammonite, is published by Berry (2018).
* A study on the growth of spines in Kimmeridgian aspidoceratids, Turonian euomphaloceratines and Coniacian collignoniceratids is published by Ifrim, Bengtson & Schweigert (2018).
* A study on the suture lines in Cretaceous ammonite genera and on the link between suture complexity and generic longevity in ammonites is published by Pérez-Claros & Bengtson (2018).
* A study on the ammonite turnover events during the broad 'mid-Cretaceous' interval is published by Bengtson & Kakabadze (2018).
* A sclerochronological study of shell material from seep and age-equivalent non-seep specimens of Baculites compressus, aiming to test the hypothesis that methane seeps provided a habitat for ammonites, is published by Landman et al. (2018).

### New taxa

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Ambites bjerageri | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Ceratite Marls | Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Gyronitidae. |
| Ambites bojeseni | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Ceratite Marls | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Gyronitidae. |
| Ambites nyingmai | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | | India | A member of Ceratitida belonging to the group Meekocerataceae and the family Gyronitidae. |
| Ambites subradiatus | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Ceratite Marls | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Gyronitidae. |
| Ambites tenuis | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Lower Ceratite Limestone | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Gyronitidae. |
| Arctoceras rubyae | Sp. nov | Valid | Jenks & Brayard | Early Triassic | | United States ( Nevada) | |
| Aspenites weitschati | Sp. nov | Valid | Jenks & Brayard | Early Triassic | | United States ( Nevada) | |
| Aspidoceras (Pseudowaagenia) inerme | Sp. nov | Valid | Énay | Late Jurassic (Kimmeridgian) | | France | |
| Awanites | Gen. et sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Ceratite Marls | Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Paranoritidae. Genus includes new species A. awani. |
| Borroceras | Gen. et sp. et comb. nov | Valid | Vermeulen et al. | Early Cretaceous | | France | A relative of Emericiceras. The type species is B. borroi; genus also includes B. ottohaasi (Sarkar, 1955) and B. mahadevai (Sarkar, 1955). |
| Bukkenites sakesarensis | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Lower Ceratite Limestone | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Proptychitidae. |
| Bullatihungarites | Gen. et comb. nov | Valid | Vörös | Middle Triassic (Anisian) | Vászoly Formation | Bosnia and Herzegovina  Hungary  Italy | A member of the family Hungaritidae. The type species is "Hungarites" emiliae Mojsisovics (1882); genus also includes "Ceratites (Hungarites)" semiplicatus Hauer (1896). |
| Clausiuraloceras mechetlense | Sp. nov | Valid | Kutygin | Permian (Kungurian) | | Russia | |
| Comahueites | Gen. et sp. nov | Valid | Aguirre-Urreta & Rawson | Early Cretaceous (Early Hauterivian) | Agrio Formation | Argentina | A member of the family Neocomitidae. Genus includes new species C. aequalicostatus. |
| Condensoceras | Gen. et comb. nov | Valid | Jenks & Brayard | Early Triassic | | United States ( Nevada) | A member of the family Xenoceltitidae; a new genus for "Xenoceltites" youngi Kummel & Steele (1962). |
| Conteites | Gen. et comb. nov | Valid | Delanoy et al. | Early Cretaceous (Barremian) | | France | A member of Ancyloceratina belonging to the family Heteroceratidae. The type species is "Heteroceras" fuhrae Delanoy (1997). |
| Costaclymenia subsolaris | Sp. nov | Valid | Korn, Bockwinkel & Ebbighausen | Devonian (Famennian) | | Morocco | |
| Crittendenites | Gen. et sp. nov | Valid | Jenks & Brayard | Early Triassic | | United States ( Nevada) | A relative of Wyomingites Hyatt (1900); both genera are assigned to the new family Crittendentidae. Genus includes new species C. jattioti. |
| Delphinites heineae | Sp. nov | Valid | Mitta | Early Cretaceous (Valanginian) | | Russia | A member of the family Neocomitidae. |
| Diptychoceras iwatense | Sp. nov | Valid | Obata & Matsukawa | Early Cretaceous | Miyako Group | Japan | |
| Djanaliparkinsonia alanica | Sp. nov | Valid | Mitta | Middle Jurassic (Bajocian) | Djangura Formation | Russia ( Karachay-Cherkessia) | A member of the family Stephanoceratidae. |
| Dorsoplanites typicus | Nom. nov | Valid | Mitta & Starodubtseva | Late Jurassic | | Russia | A replacement name for Dorsoplanites panderi auct. non Eichwald (1840). |
| Elkoceras | Gen. et comb. nov | Valid | Jenks & Brayard | Early Triassic | | United States ( Nevada) | An ammonite of uncertain phylogenetic placement; a new genus for "Dieneroceras" spathi Kummel & Steele (1962). |
| Eofrechites | Gen. et sp. nov | Valid | Ji & Bucher | Middle Triassic (Anisian) | | Canada ( British Columbia) | Genus includes new species E. roopnarini. |
| Eoscaphites kuersteineri | Sp. nov | Valid | Tajika, Tschanz & Klug | Early Cretaceous (Albian) | | Switzerland | |
| Epikellnerites | Gen. et comb. et 4 sp. nov | Valid | Vörös | Middle Triassic (Anisian) | | Bosnia and Herzegovina  Hungary  Italy | A member of the family Ceratitidae. The type species is "Ceratites" angustecarinatus Hauer (1896); genus also includes "Kellnerites" bagolinensis Brack & Rieber (1993), as well as new species E. tamasi, E. vaszolyensis, E. pseudocholnokyi and E. spinatus. |
| Gambleites | Gen. et sp. nov | Valid | Jenks & Brayard | Early Triassic | | United States ( Nevada) | A member of the family Proptychitidae. Genus includes new species G. eichhorni. |
| Geticeras | Gen. et sp. nov | Valid | Pandey, Pathak & Jaitly | Early Cretaceous (Valanginian) | Giumal Formation | India | A member of the family Neocomitidae. The type species is G. getensis. |
| Ghazalaites | Gen. et sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Lower Ceratite Limestone | India  Pakistan | A member of the family Ophiceratidae. The type species is G. roohii. |
| Glaucolithites gardarikensis | Sp. nov | Valid | Kiselev in Kiselev & Rogov | Late Jurassic | | Russia ( Ulyanovsk Oblast) | A member of the family Dorsoplanitidae. |
| Gyronites bullatus | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | | India | A member of Ceratitida belonging to the group Meekocerataceae and the family Gyronitidae. |
| Gyronites levilatus | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | | India | A member of Ceratitida belonging to the group Meekocerataceae and the family Gyronitidae. |
| Gyronites schwanderi | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Lower Ceratite Limestone | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Gyronitidae. |
| Heteroceras gracile | Sp. nov | Valid | Baudouin et al. | Early Cretaceous (late Barremian) | | Bulgaria  France  Japan? | |
| Hungarites sinuosus | Sp. nov | Valid | Vörös | Middle Triassic (Anisian) | Vászoly Formation | Hungary | A member of the family Hungaritidae. |
| Hungarites szentei | Sp. nov | Valid | Vörös | Middle Triassic (Anisian) | Vászoly Formation | Hungary | A member of the family Hungaritidae. |
| Hybonoticeras authariformis | Sp. nov | Valid | Olóriz & Villaseñor | Late Jurassic (Tithonian) | | Mexico | |
| Hypacanthoplites regina | Sp. nov | Valid | Obata & Matsukawa | Early Cretaceous | Miyako Group | Japan | |
| Hyparpadites szaboi | Sp. nov | Valid | Vörös | Middle Triassic (Anisian) | Vászoly Formation | Hungary | A member of the family Ceratitidae. |
| Immelites | Gen. et comb. nov | Valid | Bulot, Frau & Pictet | Early Cretaceous (Aptian) | Ganbadongshan Formation | China | A member of the family Acrioceratidae; a new genus for "Tonohamites" multituberculatus Immel & Guoxiong (2002). |
| Jenslehmannella | Gen. et sp. nov | Valid | Bulot, Frau & Pictet | Early Cretaceous (Early Aptian) | Dariyan Formation | Iran | A member of the family Acrioceratidae. The type species is J. bangestanense. |
| Karasyazites | Gen. et comb. nov | Valid | Mitta | Early Cretaceous | | Russia | A member of the family Himalayitidae. The type species is "Subalpinites" bajarunasi Luppov. |
| Klingerites | Gen. et comb. nov | Valid | Bulot, Frau & Pictet | Early Cretaceous (Aptian) | | Argentina  Madagascar  South Africa | A member of the family Acrioceratidae; a new genus for "Toxoceratoides"? haughtoni Klinger & Kennedy (1977). |
| Koiloceras sahibi | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Lower Ceratite Limestone | Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Paranoritidae. |
| Kossmaticeras (Kossmaticeras) kilenensis | Sp. nov | Valid | Alsen | Late Cretaceous (Coniacian) | Sølverbæk Formation | Greenland | |
| Kyoktites | Gen. et sp. et comb. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Lower Ceratite Limestone | India  Pakistan | A member of the family Ophiceratidae. The type species is K. hebeiseni; genus also includes "Meekoceras" kyokticum von Krafft (1909). |
| Leioceras hansrieberi | Sp. nov | Valid | Dietze & Schweigert | Middle Jurassic (Aalenian) | Opalinuston Formation | Germany | A member of the family Graphoceratidae. |
| Leviclymenia ramula | Sp. nov | Valid | Hartenfels & Becker | Devonian (Famennian) | | Morocco | |
| Lobitoceras | Gen. et comb. nov | Valid | Cooper | Early Cretaceous (Albian) | | Angola | A member of the family Brancoceratidae. The type species is "Elobiceras" arietiforme Spath (1922); genus also includes L. decipiens (Spath, 1922), L. flexicostatum (Spath, 1922), L. irregulare (Spath, 1922), L. szajnochai (Spath, 1922) and L. spathianum (Haas, 1942). |
| Loyezia jaenensis | Sp. nov | Valid | Vermeulen et al. | Early Cretaceous | | Spain | A member of the family Crioceratitidae. Originally described as a species of Loyezia, but subsequently transferred to the genus Binelliceras by Vermeulen et al. (2019). |
| Meekoceras bylundi | Sp. nov | Valid | Jenks & Brayard | Early Triassic | | United States ( Nevada) | |
| Montelloites | Gen. et sp. nov | Valid | Jenks & Brayard | Early Triassic | | United States ( Nevada) | A member of the family Galfettitidae. Genus includes new species M. stephensi. |
| Moutaiceras | Gen. et comb. nov | Valid | Cooper | Early Cretaceous (Albian) | | Angola | A member of the family Brancoceratidae; a new genus for "Sharpeiceras" goliath Haas (1942). |
| Mullericeras gujiaoense | Sp. nov | Valid | Dai et al. | Early Triassic (Induan) | Daye Formation | China | |
| Mullericeras indusense | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Ceratite Marls | Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Mullericeratidae. |
| Mullericeras niazii | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Ceratite Marls | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Mullericeratidae. |
| Mullericeras shigetai | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Ceratite Marls | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Mullericeratidae. |
| Neocosmoceras eliasi | Sp. nov | Valid | Vašíček, Skupien & Jagt | Early Cretaceous (early Berriasian) | Štramberk Limestone | Czech Republic | |
| Neopetitclercia | Gen. et sp. nov | Valid | Schweigert & Kapitzke | Late Jurassic (Kimmeridgian) | Impressamergel Formation | Germany | A member of the family Strigoceratidae belonging to the subfamily Phlycticeratinae. The type species is N. jantschkei. |
| Nodicoeloceras middlegatense | Sp. nov | Valid | Caruthers et al. | Early Jurassic (Lower Toarcian) | | United States ( Nevada) | |
| Nodicoeloceras nevadaense | Sp. nov | Valid | Caruthers et al. | Early Jurassic (Lower Toarcian) | | United States ( Nevada) | |
| Nodihungarites | Gen. et comb. et sp. nov | Valid | Vörös | Middle Triassic (Anisian) | Vászoly Formation | Hungary | A member of the family Hungaritidae. The type species is "Hungarites" bocsarensis Arthaber (1903); genus also includes new species N. vinczei. |
| Orientosirenites | Gen. et sp. et comb. nov | Valid | Konstantinov | Late Triassic (Carnian) | | Russia | A member of the family Sirenitidae. The type species is O. bytschkovi; genus also includes O. yakutensis (Kiparisova). |
| Parafrechites cordeyi | Sp. nov | Valid | Ji & Bucher | Middle Triassic (Anisian) | | Canada ( British Columbia) | |
| Parahungarites | Gen. et comb. et sp. nov | Valid | Vörös | Middle Triassic (Anisian) | Vászoly Formation | Bosnia and Herzegovina  Hungary  Italy | A member of the family Ceratitidae. The type species is "Hungarites" arthaberi Diener (1899); genus also includes new species P. solyensis. |
| Parakellnerites stuerzenbaumi | Sp. nov | Valid | Vörös | Middle Triassic (Anisian) | Vászoly Formation | Hungary | A member of the family Ceratitidae. |
| Pashtunites | Gen. et comb. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Paranoritidae. Genus includes "Koninckites" kraffti Spath (1934). |
| Patrulia karachaica | Sp. nov | Valid | Mitta in Mitta & Sherstyukov | Middle Jurassic (Bajocian) | | Russia ( Karachay-Cherkessia) | A member of the family Stephanoceratidae. |
| Phylloceras (Gyrophylloceras) | Nom. nov | Valid | Howarth in Énay & Howarth | Early Cretaceous | | Tunisia | A subgenus of Phylloceras; a replacement name for Gyrophyllites Wiedmann (1963). The type species is Phylloceras lateumbilicatum Pervinquière (1907). |
| Phyllopachyceras reymenti | Sp. nov | Valid | Riccardi | Early Cretaceous | | Argentina | |
| Physodoceras widerai | Sp. nov | Valid | Scherzinger, Parent & Schweigert | Late Jurassic (Tithonian) | Hangende-Bankkalke Formation | Germany | A member of the family Aspidoceratidae. |
| Prodactylioceras westgatenses | Sp. nov | Valid | Caruthers et al. | Early Jurassic (Upper Pliensbachian) | | United States ( Nevada) | |
| Proptychites wargalensis | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Lower Ceratite Limestone | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Proptychitidae. |
| Protanisoceras hanaii | Sp. nov | Valid | Obata & Matsukawa | Early Cretaceous | Miyako Group | Japan | |
| Protengonoceras neolobitoides | Sp. nov | Valid | Robert et al. | Early Cretaceous | | Mexico | |
| Protogrammoceras (Matteiceras) tipperi | Sp. nov | Valid | Caruthers et al. | Early Jurassic (Upper Pliensbachian) | | United States ( Nevada) | |
| Protolongaeviceras | Gen. et comb. nov | | Knyazev, Meledina & Alifirov | Middle Jurassic (Callovian) | | Russia | A member of Cardioceratidae. The type species is "Cadoceras (Streptocadoceras)" arcticoides Kiselev & Meledina (2004). |
| Pseudosageceras simplelobatum | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Ceratite Marls | India  Pakistan | A member of Ceratitida belonging to the group Sagecerataceae and the family Hedenstroemiidae. |
| Reymenticoceras | Gen. et comb. nov | Valid | Kennedy | Late Cretaceous (Turonian) | | Colombia | A member of Mammitinae. A new genus for "Mammites" nodosoidesappelatus Etayo-Serna (1979). |
| Reynesocoeloceras corvalani | Sp. nov | Valid | Caruthers et al. | Early Jurassic (Upper Pliensbachian) | | United States ( Nevada) | |
| Richardreymentella | Gen. et comb. nov | Valid | Bulot, Frau & Pictet | Early Cretaceous (Late Aptian) | | Argentina | A member of the family Acrioceratidae; a new genus for "Ancyloceras" patagonicum Stolley (1912). |
| Rotopericyclus chaplini | Sp. nov | Valid | Work & Mason | Carboniferous (Tournaisian) | Borden Formation | United States ( Kentucky) | |
| Rotopericyclus howardi | Sp. nov | Valid | Work & Mason | Carboniferous (Tournaisian) | Borden Formation | United States ( Kentucky) | |
| Sakartveloceras | Gen. et comb. nov | Valid | Delanoy et al. | Early Cretaceous (Barremian) | | Georgia  Iran  Turkmenistan | A member of Ancyloceratina belonging to the family Heteroceratidae. The type species is "Ammonites" securiformis Simonovich, Batsevich & Sorokin (1875); genus also includes "Colchidites" shaoriensis Djanélidzé (1926), "C." elissoae Kakabadze (1971), "C." tenuicostatus Kakabadze (1971) and "C." veleurensis Kakabadze (1971). |
| Stevensites | Nom. nov | Valid | Énay in Énay & Howarth | Late Jurassic | | Nepal | A replacement name for Stevensia Énay (2009). The type species is "Kossmatia" desmidopthycha Uhlig (1910). |
| Stoppaniceras budaii | Sp. nov | Valid | Vörös | Middle Triassic (Anisian) | Vászoly Formation | Hungary | A member of the family Ceratitidae. |
| Stoppaniceras hermanni | Sp. nov | Valid | Vörös | Middle Triassic (Anisian) | Vászoly Formation | Hungary | A member of the family Ceratitidae. |
| Stoppaniceras rieberi | Sp. nov | Valid | Vörös | Middle Triassic (Anisian) | Vászoly Formation | Hungary  Italy | A member of the family Ceratitidae. |
| Subacerites | Gen. et sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Ceratite Marls | Pakistan | A member of Ceratitida of uncertain phylogenetic placement. Genus includes new species S. friski. |
| Sutneria armigerum | Sp. nov | Valid | Énay | Late Jurassic (Kimmeridgian) | | France | |
| Titanites (Paratitanites) | Subgen. et sp. nov | Valid | Kiselev in Kiselev & Rogov | Late Jurassic | | Russia ( Ulyanovsk Oblast Yaroslavl Oblast) | The type species of the subgenus is Titanites (Paratitanites) manipulocostatus. |
| Titanites (Pseudogalbanites) | Subgen. et sp. et comb. nov | Valid | Kiselev in Kiselev & Rogov | Late Jurassic | | Russia ( Yaroslavl Oblast) | The type species of the subgenus is Titanites (Pseudogalbanites) triceps; the subgenus also includes "Kerberites" mosquensis Mikhailov (1957). |
| Tolimacoceras | Gen. et comb. nov | Valid | Kennedy | Late Cretaceous (Turonian) | | Colombia | A member of Vascoceratidae. A new genus for "Paramammites" colombianus Etayo-Serna (1979). |
| Toxancyloceras canuti | Sp. nov | Valid | Bert et al. | Early Cretaceous (Barremian) | | France  Spain | A member of Ancyloceratidae. |
| Transcaspiites transitionis | Sp. nov | Valid | Mitta | Early Cretaceous | | Russia | A member of the family Himalayitidae. |
| Transcaspiites tscheffkini | Sp. nov | Valid | Mitta | Early Cretaceous | | Russia | A member of the family Himalayitidae. |
| Ussuridiscus ornatus | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Lower Ceratite Limestone | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Mullericeratidae. |
| Ussuridiscus ventriosus | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | Lower Ceratite Limestone | India  Pakistan | A member of Ceratitida belonging to the group Meekocerataceae and the family Mullericeratidae. |
| Valdedorsella kasei | Sp. nov | Valid | Obata & Matsukawa | Early Cretaceous | Miyako Group | Japan | |
| Vavilovites meridialis | Sp. nov | Valid | Ware & Bucher in Ware et al. | Early Triassic | | India | A member of Ceratitida belonging to the group Meekocerataceae and the family Paranoritidae. |
| Vocontiiceras | Gen. et sp. nov | Valid | Diebold et al. | Late Cretaceous (Turonian) | Vocontian Basin | France | A member of the family Collignoniceratidae. Genus includes new species V. vocontiense. |
| Zittelites | Nom. nov | Valid | Énay in Énay & Howarth | Late Jurassic | | Spain | A replacement name for Zittelia Tavera Benitez (1985). The type species is "Ammonites" eudichotomus Zittel (1868). |

## Other cephalopods
### Research

* A study on the relationship between egg size, maximum size of embryonic shells and the size of the initial chamber in extant cephalopods, and on its implications for inferring reproductive strategies of fossil cephalopods, is published by Laptikhovsky, Nikolaeva & Rogov (2018).
* Mironenko (2018) proposes a new hypothesis about the habits and feeding strategies of endocerids, interpreting them as planktotrophic cephalopods, and arguing that the largest of endocerids were suspension feeders.
* Antarcticeras nordenskjoeldi Doguzhaeva in Doguzhaeva et al. (2017), originally assigned to a new cephalopod subclass Paracoleoidea and the new order Antarcticerida, is reinterpreted as a possible member of Oegopsida by Fuchs, Keupp & Klug (2018); this reinterpretation is subsequently criticized and rejected by Doguzhaeva (2018).
* A study on the changes of body size of orthoconic cephalopods known from late Silurian to late Devonian sediments in Morocco is published by Pohle & Klug (2018).
* De Baets & Munnecke (2018) report presence of bimineralic, partially calcitic shell in two orthoconic nautiloids (members of the genus Dawsonoceras from the Silurian of Sweden, and members of the genus Spyroceras from the Devonian of Morocco), unlike extant and some fossil shelled cephalopods with an aragonitic shell wall, but similar to shells of some bivalves and gastropods.
* A study on the belemnites from the Lower Jurassic localities in Buttenheim (Germany) and Lixhausen (France), focusing on changes in spacing of septa that divided the phragmocone into chambers during the animals' growth, as well as their implications for the anatomy of belemnite hatchlings, is published by Wani et al. (2018).
* A study on belemnite rostra from two Toarcian belemnite battlefields in the Buttenheim and Teufelsgraben localities (Franconia, Germany), examining whether a rostrum size difference can be recognized between the studied samples, is published by Rita, De Baets & Schlott (2018).
* A pathological belemnite rostrum, indicative of the presence of a parasite during the lifetime of the belemnite, is described from the Cretaceous (Santonian) Bavnodde Greensand (Denmark) by Hoffmann et al. (2018).
* A study on the taxonomy, stratigraphy and palaeobiogeography of the late early Maastrichtian Belemnella lineage from the eastern part of the Roztocze Hills (Poland), comparing it with forms known from western Europe and easterly areas as far the peri-Aralian Sea area of Kazakhstan, and assessing their implications for inferring the taxonomic diversification and possible migratory patterns of members of the genus Belemnella in general, is published by Remin (2018).
* The oldest known fossil ink sac of the cuttlefish belonging to the genus Sepia, preserving original eumelanin and melanosomes, is described from the Miocene (Serravallian) deposits of the Vienna Basin by Košťák et al. (2018).
* Janiszewska et al. (2018) report aragonite preservation in ammonite and nautilid specimens from Upper Cretaceous siliceous limestone sections in Poland and Ukraine, and illustrate a broad spectrum of preservation of originally aragonitic structures in these specimens.

### New taxa

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Acanthoteuthis foliorostris | Sp. nov | Valid | Ippolitov | Middle Jurassic (Bathonian) | | Russia | A belemnite belonging to the family Belemnotheutididae. |
| Aphyctoceras friesenbichlerae | Sp. nov | Valid | Pohle & Klug | Devonian (early Eifelian) | | Morocco | A nautiloid cephalopod belonging to the family Rutoceratidae. |
| Arbuckleoceras | Gen. et comb. nov | Valid | Niko, Seuss & Mapes | Carboniferous (middle Pennsylvanian) | Boggy Formation | United States ( Oklahoma) | A member of Orthocerida. Genus includes A. tricamerae (Smith). |
| Armenoceras xizangense | Sp. nov | Valid | Fang et al. | Middle Ordovician | Lhasai Formation | China | |
| Astoceras floweri | Sp. nov | Valid | Pohle & Klug | Devonian (late Emsian) | | Morocco | A member of Orthocerida belonging to the family Sichuanoceratidae. |
| Barskovisella | Gen. et 6 sp. et comb. nov | Valid | Ippolitov | Middle Jurassic (Bathonian) | | Poland  Russia  Switzerland | A belemnite belonging to the family Megateuthididae. The type species is B. issae; genus also includes B. pseudoishmensis, B. variabilis, B. barskovi, B. gracilis and B. renegata, as well as "Mesoteuthis" bajosicus Ivanova (1959) and "Nannobelus" parabellus Barskov in Mitta et al. (2004). |
| Calliconites? shimizui | Sp. nov | Valid | Niko & Ehiro | Early Triassic (Olenekian) | Osawa Formation | Japan | A member of Aulacocerida belonging to the family Xiphoteuthididae. |
| Castellanibelus vaubellensis | Sp. nov | Valid | Janssen | Early Cretaceous (Valanginian) | | France  Spain  Switzerland | A belemnite belonging to the family Duvaliidae. |
| Challinoria | Gen. et sp. nov | Valid | Ippolitov & Desai | Middle Jurassic (Bathonian) | | India | A belemnite belonging to the family Megateuthididae. Genus includes new species C. challinori. |
| Colorthoceras | Gen. et 3 sp. nov | Valid | Mutvei & Mapes | Carboniferous (Gzhelian) | Graham Formation | United States ( Texas) | A coleoid with mixed orthocerid-coleoid characteristics. The type species is C. inflata; genus also includes new species C. tubulata and C. concavus. |
| Cyclopoceras | Nom. nov | Valid | Mironenko | Devonian | | Russia | A member of Discosorida belonging to the family Taxyceratidae; a replacement name for Cyclopites Zhuravleva (1962). The type species is "Gomphoceras" cyclops Wenjukoff (1886). |
| Cylindroteuthis gelida | Sp. nov | Valid | de Lagausie in Dzyuba & de Lagausie | Middle Jurassic (Bajocian) | Yuryung-Tumus Formation | Russia | A belemnite belonging to the family Cylindroteuthididae. |
| Discoceras lindstroemi | Sp. nov | Valid | Manda & Turek | Silurian (Wenlock) | | Sweden | |
| Discoceras stridsbergi | Sp. nov | Valid | Manda & Turek | Silurian (Wenlock) | | Sweden | |
| Dolorthoceras boggyense | Sp. nov | Valid | Niko, Seuss & Mapes | Carboniferous (middle Pennsylvanian) | Boggy Formation | United States ( Oklahoma) | |
| Duvalia crassa | Sp. nov | Valid | Janssen | Early Cretaceous (Valanginian) | | Bulgaria  France  Slovakia  Spain  Switzerland | A belemnite belonging to the family Duvaliidae. |
| Duvalia elongata | Sp. nov | Valid | Janssen | Early Cretaceous (Valanginian) | | France  Spain  Switzerland | A belemnite belonging to the family Duvaliidae. |
| Duvalia kleini | Sp. nov | Valid | Janssen | Early Cretaceous (Valanginian) | | France  Romania  Spain | A belemnite belonging to the family Duvaliidae. |
| Duvalia superconstricta | Sp. nov | Valid | Janssen | Early Cretaceous (Valanginian) | | Crimean Peninsula  France  Spain  Switzerland  Hungary? | A belemnite belonging to the family Duvaliidae. |
| Eocylindroteuthis gracilenta | Sp. nov | Valid | Dzyuba & Schraer in Dzyuba et al. | Middle Jurassic (Bajocian) | | United States ( Alaska) | A belemnite. |
| Eocylindroteuthis mariottii | Sp. nov | Valid | Ippolitov | Middle Jurassic (Bajocian) | | Russia ( Volgograd Oblast) | A belemnite. |
| Eocylindroteuthis riegrafi | Sp. nov | Valid | Dzyuba & Schraer in Dzyuba et al. | Middle Jurassic (Bajocian) | | United States ( Alaska) | A belemnite. |
| Eocylindroteuthis weisi | Sp. nov | Valid | Ippolitov | Middle Jurassic (Bajocian) | | Russia ( Volgograd Oblast) | A belemnite. |
| Eocylindroteuthis yarkovi | Sp. nov | Valid | Ippolitov | Middle Jurassic (Bajocian) | | Russia ( Volgograd Oblast) | A belemnite. |
| Geidoloceras hebeiseni | Sp. nov | Valid | Pohle & Klug | Devonian (Pragian) | | Morocco | A member of Pseudorthocerida belonging to the family Pseudorthoceratidae. |
| Hastites orphana | Sp. nov | Valid | Ippolitov | Middle Jurassic (Bajocian) | | Russia ( Volgograd Oblast) | A belemnite. |
| "Hibolithes" lebresensis | Sp. nov | Valid | Janssen | Early Cretaceous (Valanginian) | Vocontian Basin | France | A belemnite belonging to the family Belemnopseidae. |
| Homaloteuthis volgogradensis | Sp. nov | Valid | Ippolitov | Middle Jurassic (Bajocian) | | Russia ( Volgograd Oblast) | A belemnite. |
| Idahoteuthis | Gen. et sp. nov | Valid | Doguzhaeva & Brayard in Doguzhaeva et al. | Early Triassic (Olenekian) | Thaynes Group | United States ( Idaho) | A member of Coleoidea, possibly belonging to the order Myopsida. The type species is I. parisiana. |
| Infundibuloceras kroegeri | Sp. nov | Valid | Pohle & Klug | Devonian (Emsian) | | Morocco | A member of Orthocerida belonging to the family Orthoceratidae. |
| Mesonaedyceras | Gen. et sp. nov | Valid | Pohle & Klug | Devonian (Eifelian) | | Morocco | A member of Oncocerida belonging to the family Naedyceratidae. Genus includes new species M. laterobliquum. |
| Miyagiteuthis | Gen. et comb. nov | Valid | Niko & Ehiro | Late Triassic (early Norian) | Chonomori Formation | Japan | A member of Aulacocerida belonging to the family Aulacoceratidae. The type species is "Dictyoconites" nipponicus Shimizu & Mabuti (1941). |
| Nebraskaconus | Gen. et sp. nov | Valid | Mapes & Doguzhaeva | Carboniferous (Kasimovian) | Stark Shale | United States ( Nebraska) | A member of Coleoidea. Genus includes new species N. whitei. |
| Oklaconus | Gen. et sp. nov | Valid | Doguzhaeva & Mapes | Carboniferous (Moscovian) | Wewoka Shale | United States ( Oklahoma) | A bactritoid-like coleoid. Genus includes new species O. okmulgeensis. |
| Pabianiconus | Gen. et sp. nov | Valid | Mapes & Doguzhaeva | Carboniferous (Kasimovian) | Stark Shale | United States ( Nebraska) | A member of Coleoidea. Genus includes new species P. starkensis. |
| Pachtoceras laghdadense | Sp. nov | Valid | Pohle & Klug | Devonian (late Givetian) | | Morocco | A member of Oncocerida belonging to the family Poterioceratidae. |
| Pachyteuthis mittai | Sp. nov | Valid | Ippolitov | Middle Jurassic (Bathonian) | | Russia | A belemnite belonging to the family Cylindroteuthididae. |
| Paramegateuthis ovata | Sp. nov | Valid | de Lagausie & Dzyuba in Dzyuba & de Lagausie | Middle Jurassic (Bajocian) | Yuryung-Tumus Formation | Norway  Russia | A belemnite belonging to the family Megateuthididae. |
| Paramegateuthis schurygini | Sp. nov | Valid | Dzyuba in Dzyuba & de Lagausie | Middle Jurassic (Bathonian) | Yuryung-Tumus Formation | Russia | A belemnite belonging to the family Megateuthididae. |
| Parapassaloteuthis francoizbreutae | Sp. nov | Valid | Weis & Mariotti | Early Jurassic (Toarcian) | | France | A belemnite. |
| Patelloctopus | Gen. et sp. nov | Valid | Fuchs & Schweigert | Late Jurassic (Kimmeridgian) | Nusplingen Limestone | Germany | A member of the stem group of the Octopoda or a stem-incirrate. Genus includes new species P. ilgi. |
| Phatthalungoceras | Gen. et sp. nov | Valid | Tongtherm & Nabhitabhata | Middle Triassic (Anisian) | Chaiburi Formation | Thailand | A member of the family Orthoceratidae. The type species is P. srisuki. |
| Pseudendoplectoceras angustum | Sp. nov | Valid | Pohle & Klug | Devonian (Pragian) | | Morocco | A member of Discosorida belonging to the family Phragmoceratidae. |
| Pseudosimobelus | Gen. et sp. nov | Valid | Dzyuba & Schraer in Dzyuba et al. | Middle Jurassic (Bajocian) | | United States ( Alaska) | A belemnite. Genus includes new species P. tuxedniensis. |
| Sepia fabianschwankei | Sp. nov | Valid | Košták & Jagt | Miocene | Twistringen Beds | Germany | A species of Sepia. |
| Smithorthoceras | Gen. et comb. nov | Valid | Niko, Seuss & Mapes | Carboniferous (middle Pennsylvanian) | Boggy Formation | United States ( Oklahoma) | A member of Orthocerida. Genus includes S. unicamera (Smith). |
| Starkites | Gen. et sp. nov | Valid | Mapes & Doguzhaeva | Carboniferous (Kasimovian) | Stark Shale | United States ( Nebraska) | A member of Coleoidea. Genus includes new species S. compressus. |
| Subormoceras asymmetricum | Sp. nov | Valid | Pohle & Klug | Devonian (Pragian) | | Morocco | A member of Pseudorthocerida belonging to the family Pseudorthoceratidae. |
| Subtheoceras | Gen. et sp. nov | Valid | Pohle & Klug | Devonian (Pragian) | | Morocco | A member of Orthocerida belonging to the family Orthoceratidae. Genus includes new species S. striatum. |
| Sulphurnites | Gen. et sp. nov | Valid | Niko, Seuss & Mapes | Carboniferous (middle Pennsylvanian) | Boggy Formation | United States ( Oklahoma) | A member of Orthocerida. Genus includes new species S. taffi. |
| Unklesbayoceras | Gen. et sp. nov | Valid | Niko, Seuss & Mapes | Carboniferous (middle Pennsylvanian) | Boggy Formation | United States ( Oklahoma) | A member of Orthocerida. Genus includes new species U. striatulum. |

## Gastropods
### Research

* A study on the evolutionary history of endemic genera of Late Cretaceous shallow-marine gastropods from the rim of the Northeast Pacific (a region extending from the Alaska Peninsula southward to the northern part of Baja California Sur, Mexico) is published by Squires (2018).
* New fossil material of "Pleurotomaria" perlata is described from the Silurian Niagara Group (Ohio, United States) by Peel (2018), who interprets new fossils as indicating that "P." perlata wasn't a pleurotomariid vetigastropod, and transfers this species to the genus Isfarispira.
* A study on the effect of climatic cooling on the cannibalistic behaviour of members of the genus Falsilunatia from the Eocene La Meseta Formation (Antarctica) is published by Dietl, Nagel-Myers & Aronson (2018).
* A study on predatory traces in gastropod specimens collected from middle Eocene beds of the Paris Basin and the lower Miocene Chipola Formation in Florida, and on their implications for inferring possible correlations between the shell morphology and the vulnerability to predators in fossil marine gastropods, is published by Ishikawa, Kase & Tsutsui (2018).

### New taxa

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Acirsa sceauxsensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Acirsa. |
| Adelphotectonica bieleri | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A member of the family Architectonicidae. |
| Aegopinella depressula | Sp. nov | Valid | Harzhauser & Neubauer | Miocene | | Poland | A species of Aegopinella. |
| Allmoniella | Gen. et sp. et comb. nov | Valid | Dolin & Dockery | Eocene (Bartonian) | Cook Mountain Formation | United States ( Louisiana  Mississippi) | A member of Ovulidae. Genus includes new species A. magnolia, as well as "Cypraea" vaughani Johnson (1899). |
| Alvania acuticarinata | Nom. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania; a replacement name for Delphinula carinata Millet (1854). |
| Alvania armata | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania couffoni | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania fezata | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania globosa | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania insulsa | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania josephineae | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania lachrimula | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania milleti | Nom. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania; a replacement name for Rissoa suturalis Millet (1865). |
| Alvania milletispinosa | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania miocalasi | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania miolactea | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania napoleoni | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania parasusieae | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania redoniana | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania renauleauensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania subtiliangulosa | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania susieae | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania tenuisculpturata | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Alvania turtaudierei | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Alvania. |
| Amalda acutapex | Sp. nov | Valid | Raven & Recourt | Miocene | | Brunei | A species of Amalda. |
| Amalda bruneiana | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Amalda. |
| Amalda miriensis | Sp. nov | Valid | Raven & Recourt | Miocene | | Malaysia | A species of Amalda. |
| Angaria complanata | Sp. nov | Valid | Gain, Belliard & Le Renard | Eocene | | France | A species of Angaria. |
| Angaria constantinensis | Sp. nov | Valid | Gain, Belliard & Le Renard | Eocene | | France | A species of Angaria. |
| Angaria nigellensis | Sp. nov | Valid | Gain, Belliard & Le Renard | Eocene | | France | A species of Angaria. |
| Angaria scutellata | Sp. nov | Valid | Gain, Belliard & Le Renard | Eocene | | France | A species of Angaria. |
| Aphanitoma marqueti | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Aphanitoma. |
| Aporrhais sauditica | Sp. nov | Valid | Ferrari et al. | Jurassic | | Saudi Arabia | A species of Aporrhais. |
| Archierato antonioi | Sp. nov | Valid | Fehse & Villacampa | Miocene | | United States ( Florida) | A member of the family Eratoidae. |
| Archimediella sancticlementensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | |
| Architectonica beetsi | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Architectonica. |
| Asthenotoma lanceolata | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Asthenotoma. |
| Ataxocerithium turbineum | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Ataxocerithium. |
| Athleta (Volutospina) delvallei | Sp. nov | Valid | Astibia, Merle & Pacaud in Astibia et al. | Eocene (Bartonian-?early Priabonian) | Ardanatz Sandstone Ilundain Marl Formation | Spain | A species of Athleta. |
| Athleta nikolaji | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Athleta. |
| Bela falbalae | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Bela. |
| Bernaya amandula | Sp. nov | Valid | Pacaud | Eocene (Bartonian) | | France | A species of Bernaya. |
| Biconomphalus | Gen. et sp. nov | Valid | Szabó | Early Jurassic (Sinemurian to Pliensbachian) | Hierlatz Limestone | Austria | A possible member of the family Eucyclidae. The type species is B. singularis. |
| Biomphalaria manya | Sp. nov | Valid | Cabrera & Martínez | Late Cretaceous | Queguay Formation | Uruguay | A species of Biomphalaria. |
| Biplica paleocenica | Sp. nov | Valid | Amano & Jenkins in Amano, Jenkins & Kurita | Paleocene | Katsuhira Formation | Japan | |
| Bithynia erzurumensis | Sp. nov | Valid | Harzhauser, Neubauer & Hoşgör | Late Oligocene or early Miocene | Susuz Formation | Turkey | A species of Bithynia. |
| Bittium crassum | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Bittium. |
| Bittium gallicum | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Bittium. |
| Bittium pingue | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Bittium. |
| Bittium renauleauense | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Bittium. |
| Boreocomitas inouei | Sp. nov | Valid | Amano, Hryniewicz & Jenkins | Paleocene | Katsuhira Formation | Japan | A member of the family Pseudomelatomidae. |
| Borystheniella | Gen. et 3 sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | A member of the family Cypraeidae. The type species is B. incisa; genus also includes new species B. gracilenta and B. zamberlani. |
| Caballasea | Gen. et sp et comb. nov | Valid | DeVries | Early Paleogene | Carroza Formation Pisco Basin (Caballas Formation) | Mexico  Peru | The type species is C. segmentata; genus also includes "Pachychilus (Pachychiloides)" lawtoni Perrilliat et al. (2008). |
| Callina waldeni | Sp. nov | Valid | Groh & De Mattia in De Mattia, Neiber & Groh | Quaternary | | Portugal ( Madeira) | A member of Helicoidea belonging to the family Geomitridae. |
| Calliotropis (Riselloidea) faustiankensis | Sp. nov | Valid | Ferrari & Kaim | Middle Jurassic | | Poland | A species of Calliotropis. |
| Calliotropis (Riselloidea) lukovensis | Sp. nov | Valid | Ferrari & Kaim | Middle Jurassic | | Poland | A species of Calliotropis. |
| Calliovarica oregonensis | Sp. nov | Valid | Hickman | Early late Eocene | Nestucca Formation | United States ( Oregon) | A member of the family Chilodontaidae. |
| Callotrochus? avernoides | Sp. nov | Valid | Szabó | Early Jurassic (Sinemurian to Pliensbachian) | Hierlatz Limestone | Austria | A possible member of the family Calliostomatidae. |
| Carnevalea santiapillaii | Sp. nov | Valid | Epa et al. | Late Oligocene | Nsungwe Formation | Tanzania | A member of the family Ampullariidae. |
| Carychium stworzewiczae | Sp. nov | Valid | Harzhauser & Neubauer | Miocene | | Poland | A species of Carychium. |
| Cassis calusa | Sp. nov | Valid | Petuch & Berschauer | Pleistocene | Caloosahatchee Formation | United States ( Florida) | A species of Cassis. |
| Cassis powelli | Sp. nov | Valid | Petuch & Berschauer | Pleistocene | Caloosahatchee Formation | United States ( Florida) | A species of Cassis. |
| Cerithiella malakae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Cerithiella. |
| Cerithiella salmae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Cerithiella. |
| Cerithiopsis andreae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Cerithiopsis. |
| Cerithiopsis boanderseni | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Cerithiopsis. |
| Cerithiopsis cerithiopsoides | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Cerithiopsis. |
| Cerithiopsis emilieae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Cerithiopsis. |
| Cerithiopsis esterae | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Cerithiopsis. |
| ?Cerithiopsis luiseae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | Possibly a species of Cerithiopsis. |
| Cerithiopsis mira | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Cerithiopsis. |
| Cerithium miocanariensis | Sp. nov | Valid | Martín-González & Vera-Peláez in Martín-González et al. | Late Miocene | | Spain ( Canary Islands) | A species of Cerithium. |
| Chelidonura radwanskii | Sp. nov | Valid | Bałuk | Miocene (Langhian) | Korytnica Basin | Poland | A species of Chelidonura. |
| Clathurella pierreaimei | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Clathurella. |
| Clavatula helwerdae | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Clavatula. |
| Clavogyra | Gen. et sp. nov | Valid | Leroy | Eocene (Ypresian) | Paris Basin | France | A member of the family Turbinellidae. The type species is C. ledeei. |
| Cleotrivia gallica | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Cleotrivia. |
| Coelostylina hydrobiformis | Sp. nov | Valid | Nützel & Ware in Nützel et al. | Early Triassic | | Pakistan | A member of the family Coelostylinidae. |
| Coelostylina micropunctata | Sp. nov | Valid | Nützel, Kaim & Grădinaru | Middle Triassic (Anisian) | | Romania | A member of the family Coelostylinidae. |
| Conasprella paupera | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Conasprella. |
| Conasprella trianginodus | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Conasprella. |
| Conus fuerteventurensis | Sp. nov | Valid | Vera-Peláez & Martín-González in Martín-González et al. | Late Miocene | | Spain ( Canary Islands) | A species of Conus. |
| Conus (Stephanoconus) woodringi | Sp. nov | Valid | Hendricks | Miocene | Gatun Formation | Panama | A species of Conus. |
| Crassispira strangulata | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Crassispira. |
| Crassitonella lozoueti | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | |
| Cretatortulosa | Gen. et sp. nov | Valid | Yu, Wang & Pan | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A member of the family Pupinidae. Genus includes new species C. multilinea. |
| Cristispira caballasensis | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A member of the family Turritellidae. |
| Csigabaga | Gen. et sp. nov | Valid | Szabó | Early Jurassic (Sinemurian to Pliensbachian) | Hierlatz Limestone | Austria | A member of the family Proconulidae. The type species is C. nillae. |
| Cupaniella praebiplicata | Sp. nov | Valid | Szabó | Early Jurassic (Sinemurian to Pliensbachian) | Hierlatz Limestone | Austria | A member of the family Chilodontaidae. |
| Cymbiola ambugensis | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Cymbiola. |
| Cymbovula (Winklea) | Subgen. nov | Valid | Dolin & Dockery | Eocene (Bartonian) | Cook Mountain Formation | United States ( Alabama) | A subgenus of Cymbovula. The subgenus includes Cymbovula transovuloides (Schilder, 1926). |
| Cypraedia durandae | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | A species of Cypraedia. |
| Cypraedia fragilis | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | A species of Cypraedia. |
| Cypraedia insperata | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | A species of Cypraedia. |
| Cypraedia prunellum | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | A species of Cypraedia. |
| Cypraeorbis angustior | Sp. nov | Valid | Checchi & Zamberlan | Eocene (late Ypresian-early Lutetian) | | Italy | A species of Cypraeorbis. |
| Cypraeorbis longula | Sp. nov | Valid | Checchi & Zamberlan | Eocene (late Ypresian-early Lutetian) | | Italy | A species of Cypraeorbis. |
| Dermomurex nemethi | Sp. nov | Valid | Kovács | Middle Miocene | Sámsonháza Formation | Hungary | A species of Dermomurex. |
| Desbruyeresia belliatus | Sp. nov | Valid | Hybertsen & Kiel | Middle Eocene | Humptulips Formation | United States ( Washington) | A species of Desbruyeresia. |
| Discopsis pseudocanui | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Discopsis. |
| Dizoniopsis boucheti | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Dizoniopsis. |
| Dolomena bruneiensis | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Dolomena. |
| Duplicaria aequalis | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Duplicaria. |
| Eographis | Gen. et sp. nov | Valid | Nützel & Ware in Nützel et al. | Early Triassic | | Pakistan | A member of the family Hyalogyrinidae. The type species is E. microlineata. |
| Eotrivia amitrovi | Sp. nov | Disputed | Pacaud | Eocene (Priabonian) | | Ukraine | Fehse (2021) considered this species to be a junior synonym of Eotrivia faracii (de Gregorio, 1880). |
| Eotrivia ledoni | Sp. nov | Valid | Pacaud | Eocene (Lutetian) | | France | |
| ?Epetrium flemmingi | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | |
| ?Epetrium pernilleae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | |
| Erato lozoueti | Sp. nov | Valid | Fehse | Oligocene (Chattian) | | France | A species of Erato. |
| Erato prodromos | Nom. nov | Valid | Fehse | Oligocene (Chattian) | | France | A species of Erato. The original specific name was Erato precursor Fehse (2018), which turned out to be preoccupied by Erato praecursor Cossmann & Pissarro (1905). |
| Eratopsis zoltani | Sp. nov | Valid | Fehse | Miocene | | Hungary | A member of the family Eratoidae. |
| Eratotrivia neptis | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | |
| Eucyclomphalus? subgradatus | Sp. nov | Valid | Szabó | Early Jurassic (Sinemurian to Pliensbachian) | Hierlatz Limestone | Austria | A member of the family Eucycloscalidae. |
| Eucypraedia bertechae | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Eucypraedia longiuscula | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Eucypraedia ocliferia | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Euphemites rollinsi | Sp. nov | Valid | Harper | Carboniferous (Mississippian) | Gilmore City Formation | United States ( Iowa) | A member of Bellerophontoidea. |
| Eurocystina | Gen. et sp. nov | Valid | Harzhauser & Neubauer | Miocene | | Poland | A member of the family Pristilomatidae. The type species is E. nordsiecki. |
| Euryalox applanatus | Sp. nov | Valid | Nützel, Kaim & Grădinaru | Middle Triassic (Anisian) | | Romania | A member of the family Phymatopleuridae. |
| Euthema | Gen. et sp. nov | Valid | Yu, Wang & Pan | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A member of the family Diplommatinidae. Genus includes new species E. naggsi. |
| Euthria viciani | Sp. nov | Valid | Kovács | Middle Miocene | Leitha Limestone Formation | Hungary | A species of Euthria. |
| Exilia frejae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Exilia. |
| Ficus parvissima | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Ficus. |
| Garviea | Gen. et comb. nov | Valid | Dolin & Dockery | Eocene (Bartonian) | Cook Mountain Formation | Trinidad and Tobago  United States ( Alabama  Mississippi  Texas) | A member of Cypraeidae belonging to the subfamily Gisortiinae. The type species is "Cypraea" nuculoides Aldrich (1903); genus also includes "Archicypraea" degenerata Schilder (1939). |
| Gastrocopta (Albinula) polonica | Sp. nov | Valid | Harzhauser & Neubauer | Miocene | | Poland | A species of Gastrocopta. |
| Gemmula sculpturata | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Gemmula. |
| Genota maximei | Nom. nov | Valid | Ceulemans, Van Dingenen & Landau | Miocene | | France | A species of Genota; a replacement name for Pleurotoma insignis Millet, non Edwards, 1861. |
| Gibbula tindayaensis | Sp. nov | Valid | Martín-González & Vera-Peláez in Martín-González et al. | Late Miocene | | Spain ( Canary Islands) | A species of Gibbula. |
| Gisortia khargaensis | Sp. nov | Valid | Hewaidy, El Qot & Moneer | Early Eocene | El Rufuf Formation | Egypt | |
| Gymnobela santorsolae | Sp. nov | Valid | Tabanelli | Pliocene and Pleistocene (Gelasian) | | Italy | A species of Gymnobela. |
| Haedropleura fratemcontii | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Haedropleura. |
| Hemifusus charlieleei | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Hemifusus. |
| Hierlatzella | Gen. et sp. nov | Valid | Szabó | Early Jurassic (Sinemurian to Pliensbachian) | Hierlatz Limestone | Austria | A member of the family Coelostylinidae. The type species is H. arcana. |
| Hippochrenes nautagarona | Sp. nov | Valid | Pacaud, Teodori & Bilotte | Late Cretaceous (Maastrichtian) | | France | A member of the family Rostellariidae. |
| Hystricella microcarinata | Sp. nov | Valid | De Mattia & Groh in De Mattia, Neiber & Groh | Quaternary | | Portugal ( Madeira) | A species of Hystricella. |
| Indomitrella acuticonica | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Indomitrella. |
| Inella alia | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Inella. |
| Inella rolani | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Inella. |
| Jujubinus ajachaensis | Sp. nov | Valid | Martín-González & Vera-Peláez in Martín-González et al. | Late Miocene | | Spain ( Canary Islands) | A species of Jujubinus. |
| Kangilioptera gundstrupensis | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | |
| Karsaconulus | Gen. et sp. nov | Valid | Szabó | Early Jurassic (Sinemurian to Pliensbachian) | Hierlatz Limestone | Austria | A member of the family Proconulidae. The type species is K. robustus. |
| Kericserispira | Nom. nov | Valid | Szabó | Early Jurassic (Sinemurian to Pliensbachian) | Hierlatz Limestone | Austria  France  Hungary | A possible member of Pithodeidae; a replacement name for Foveolaria Szabó (2016). |
| Klavlia | Gen. et sp. nov | Valid | Mazaev | Middle Permian | Krasnyi Yar Beds | Russia ( Samara Oblast) | A member of the family Holopeidae belonging to the subfamily Gyronematinae. Genus includes new species K. klavlia. |
| Ladinaticella simionescui | Sp. nov | Valid | Nützel, Kaim & Grădinaru | Middle Triassic (Anisian) | | Romania | A member of Neritimorpha belonging to the family Scalaneritinidae. |
| Laevicaspia vinarskii | Sp. nov | Valid | Neubauer et al. | Late Pleistocene | | Russia ( Astrakhan Oblast) | A member of the family Hydrobiidae. |
| Lanistes microovum | Sp. nov | Valid | Epa et al. | Late Oligocene | Nsungwe Formation | Tanzania | A species of Lanistes. |
| Lanistes nsungwensis | Sp. nov | Valid | Epa et al. | Late Oligocene | Nsungwe Formation | Tanzania | A species of Lanistes. |
| Lanistes rukwaensis | Sp. nov | Valid | Epa et al. | Late Oligocene | Nsungwe Formation | Tanzania | A species of Lanistes. |
| Lanistes songwellipticus | Sp. nov | Valid | Epa et al. | Late Oligocene | Nsungwe Formation | Tanzania | A species of Lanistes. |
| Lanistes songweovum | Sp. nov | Valid | Epa et al. | Late Oligocene | Nsungwe Formation | Tanzania | A species of Lanistes. |
| Leiostyla piserai | Sp. nov | Valid | Harzhauser & Neubauer | Miocene | | Poland  Austria? | A species of Leiostyla. |
| Levifusus metteae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | |
| Lophospira telleri | Sp. nov | Valid | Peel | Silurian | Racine Formation | United States ( Illinois Wisconsin) | A member of the family Lophospiridae. |
| Lozouetina | Gen. et comb. nov | Valid | Dolin & Dockery | Eocene (Lutetian and Bartonian) | Biarritzian Formation Cook Mountain Formation Kosciusko Formation | France  Spain  United States ( Mississippi South Carolina Texas) | A member of the family Ovulidae belonging to the subfamily Pediculariinae. The type species is "Trivia" recluzi Cossmann (1897); genus also includes "Cypraea" kennedyi Harris (1895). |
| Macromphalina morgani | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Macromphalina. |
| ?Mangelia stoutjesdijki | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | Possibly a species of Mangelia. |
| Mannegaardina | Gen. et sp. nov | Valid | Frýda, Ebbestad & Frýdová | Silurian (Gorstian) | | Sweden | A member of Porcellioidea. Genus includes new species M. hedei. |
| Marmolatella iordanae | Sp. nov | Valid | Nützel, Kaim & Grădinaru | Middle Triassic (Anisian) | | Romania | A member of Neritimorpha belonging to the family Naticopsidae. |
| Martinietta kadolskyi | Sp. nov | Valid | Harzhauser & Neubauer | Miocene | | Poland | A member of the family Hydrobiidae. |
| Mcleaniella | Gen. et comb. nov | Valid | Pacaud | Paleocene | | France | A member of the family Liotiidae; a new genus for "Solarium" danae d'Orbigny (1850). |
| Meekospira baytuganensis | Sp. nov | Valid | Mazaev | Middle Permian | Baitugan Beds | Russia ( Samara Oblast) | A member of the family Meekospiridae. |
| Melanella indicaformis | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A species of Melanella. |
| Menathais viciani | Sp. nov | Valid | Kovács | Middle Miocene | Sámsonháza Formation | Hungary | A member of the family Muricidae. |
| Mennoia | Gen. et sp. nov | Valid | Harzhauser & Neubauer | Miocene | | Poland | A member of Limacoidea of uncertain phylogenetic placement. The type species is M. sculpturata. |
| Monophorus renauleauensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Monophorus. |
| Morula mionigra | Sp. nov | Valid | Martín-González in Martín-González et al. | Late Miocene | | Spain ( Canary Islands) | A species of Morula. |
| Murchisonietta | Gen. et sp. nov | Valid | Nützel, Kaim & Grădinaru | Middle Triassic (Anisian) | | Romania | A possible member of the family Goniasmatidae. Genus includes new species M. acuta. |
| Nassarius pseudoovum | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Nassarius. |
| Nerita squatina | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A species of Nerita. |
| Neritaria kamyshlensis | Sp. nov | Valid | Mazaev | Middle Permian | Krasnyi Yar Beds | Russia ( Samara Oblast) | A member of the family Neritidae. |
| Neritoptyx hogansoni | Sp. nov | Valid | Erickson | Late Cretaceous (Maastrichtian) | Fox Hills Formation | United States | |
| Neubertella | Gen. et sp. nov | Valid | Harzhauser & Neubauer | Miocene | | Poland | A member of Limacoidea of uncertain phylogenetic placement. The type species is N. pulchra. |
| Neverita majimai | Sp. nov | Valid | Amano & Jenkins in Amano, Jenkins & Kurita | Paleocene | Katsuhira Formation | Japan | A species of Neverita. |
| Ninglangella samarensis | Sp. nov | Valid | Mazaev | Middle Permian | Krasnyi Yar Beds | Russia ( Samara Oblast) | A member of the family Meekospiridae. |
| Niveria cylindriclementi | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Niveria. |
| Nodifaunus gainesi | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | |
| Obesula marshalli | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | |
| Ocinebrina landaui | Sp. nov | Valid | Kovács | Middle Miocene | Dej Formation | Romania | A species of Ocinebrina. |
| Occidentina | Gen. et comb. nov | Valid | Harzhauser & Neubauer | Miocene | | Austria  Hungary  Poland | A member of the family Diplommatinidae. The type species is "Adelopoma" martensi Andreae (1902). |
| Oligodia chauvereauensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | |
| Oliva balteata | Sp. nov | Valid | Raven & Recourt | Miocene | | Malaysia | A species of Oliva. |
| Oliva bekenuensis | Sp. nov | Valid | Raven & Recourt | Miocene | | Malaysia | A species of Oliva. |
| Oliva curta | Sp. nov | Valid | Raven & Recourt | Miocene | | Malaysia | A species of Oliva. |
| Oliva telescopica | Sp. nov | Valid | Raven & Recourt | Miocene | | Malaysia | A species of Oliva. |
| Olivella microstriata | Sp. nov | Valid | Raven & Recourt | Miocene | | Brunei | A species of Olivella. |
| Ondina asterixi | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Ondina. |
| Onoba fragilis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Onoba. |
| Onoba incisa | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Onoba. |
| Onoba redoniensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Onoba. |
| Orbitestella dioi | Sp. nov | Valid | Hybertsen & Kiel | Middle Eocene | Humptulips Formation | United States ( Washington) | A member of the family Orbitestellidae. |
| Ornopsis? barisensis | Sp. nov | Valid | Hewaidy, El Qot & Moneer | Early Paleocene | Kurkur Formation | Egypt | |
| Orthochetus darraghi | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | |
| Osilinus burgadoi | Sp. nov | Valid | Martín-González in Martín-González et al. | Late Miocene | | Spain ( Canary Islands) | A species of Osilinus. |
| Papposilenus | Gen. et comb. et sp. nov | Valid | DeVries | Early Paleogene to Miocene | Pisco Basin (Caballas Formation) | Colombia  Dominican Republic  Ecuador  Peru  United States ( Florida) | A member of the family Potamididae. The type species is "Cerithium" suprasulcatum Gabb (1873); genus also includes "Cerithium" suprasulcatum Gabb (1873), "Potamides" ormei Maury (1917), "Potamides" infraliratus Spieker (1922) and a new species Papposilenus utriculus. |
| Papuliscala presselierensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Papuliscala. |
| Papuliscala redoniensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Papuliscala. |
| Paradrillia pachyspira | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Paradrillia. |
| Paradrobacia hrvatovici | Sp. nov | Valid | Harzhauser, Mandic & Neubauer in Harzhauser et al. | Miocene (Langhian) | | Bosnia and Herzegovina | A member of the family Helicidae. |
| Paraseraphs cantamessae | Sp. nov | Valid | Maxwell, Congdon & Rymer | Eocene (Priabonian) | White Limestone Formation | Jamaica | A member of the family Seraphsidae. |
| Patella mahamensis | Sp. nov | Valid | Martín-González in Martín-González et al. | Late Miocene | | Spain ( Canary Islands) | A species of Patella. |
| Patella maxoratensis | Sp. nov | Valid | Martín-González & Vera-Peláez in Martín-González et al. | Late Miocene | | Spain ( Canary Islands) | A species of Patella. |
| Patella tintina | Sp. nov | Valid | Martín-González & Vera-Peláez in Martín-González et al. | Late Miocene | | Spain ( Canary Islands) | A species of Patella. |
| Payraudeautia obelixi | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Payraudeautia. |
| Pernericirrus lindstroemi | Sp. nov | Valid | Frýda, Ebbestad & Frýdová | Silurian (Ludfordian) | | Sweden | A member of Porcellioidea. |
| Phos bruneiensis | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Phos. |
| Planellavitrina | Gen. et sp. nov | Valid | Margry | | | Spain ( Canary Islands) | A member of the family Vitrinidae. Genus includes new species P. occulta. |
| Potamides henryi | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A species of Potamides. |
| Potamides janeae | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A species of Potamides. |
| Powellisetia europaea | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Powellisetia. |
| Praealaerato | Gen. et sp. nov | Valid | Fehse | Oligocene (Chattian) | | France | A relative of members of the genus Erato. Genus includes new species P. pacaudi. |
| Praerosaria besucus | Sp. nov | Valid | Pacaud | Eocene (Bartonian) | | France | A member of the family Cypraeidae. |
| Praerosaria borysthenis | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | A member of the family Cypraeidae. |
| Praerosaria stefanskyii | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | A member of the family Cypraeidae. |
| Primovula (Squiresia) | Subgen. nov | Valid | Dolin & Dockery | Eocene (Bartonian) | Cook Mountain Formation | United States ( Alabama) | A subgenus of Primovula. The subgenus includes Primovula symmetrica (Aldrich, 1903). |
| Projenneria acinonyx | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | A member of the family Ovulidae. |
| Projenneria maculata | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | A member of the family Ovulidae. |
| Provanna fortis | Sp. nov | Valid | Hybertsen & Kiel | Middle Eocene | Humptulips Formation | United States ( Washington) | A species of Provanna. |
| Prunum seriaense | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Prunum. |
| Pseudoklikia | Gen. et comb. nov | Valid | Nordsieck | Early Pleistocene | | Austria | A member of the family Helicidae. The type species is "Klikia" altenburgensis Binder (1977). |
| Pseudosetia ivolasi | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Pseudosetia. |
| Pseudosetia peyroti | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Pseudosetia. |
| Pseudosetia sergegofasi | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Pseudosetia. |
| Pseudosetia wareni | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Pseudosetia. |
| Pseudosimnia (Vokesina) | Subgen. et sp. nov | Valid | Dolin & Dockery | Eocene (Bartonian) | Cook Mountain Formation | United States ( Mississippi) | A subgenus of Pseudosimnia. The subgenus includes new species P. (V.) anteana. |
| Pusillina dollfusi | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Pusillina. |
| Pusillina gallica | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Pusillina. |
| Pyropsis jakobseni | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | |
| Pyropsis pacaudi | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | |
| Quadrinervus wienekei | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | |
| Racheliella | Gen. et comb. nov | Valid | Nützel | Late Triassic (Carnian) | San Cassiano Formation | Italy | A member of Mathildoidea; a new genus for "Loxonema" mersai. |
| Raphitoma georgesi | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Raphitoma. |
| Raphitoma landreauensis | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Raphitoma. |
| Raphitoma palumbina | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Raphitoma. |
| Raphitoma pseudoconcinna | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Raphitoma. |
| Raphitoma turtaudierei | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Raphitoma. |
| Raphitoma vercingetorixi | Sp. nov | Valid | Ceulemans, Van Dingenen & Landau | Pliocene (Zanclean) | | France | A species of Raphitoma. |
| Rasatomaria multistriata | Sp. nov | Valid | Nützel, Kaim & Grădinaru | Middle Triassic (Anisian) | | Romania | A possible member of the family Pleurotomariidae. |
| Ravniella lipmanorum | Sp. nov | Valid | Squires in Squires & Lipman | Paleocene | San Francisquito Formation Santa Susana Formation | United States ( California) | A member of the family Acteonidae. |
| Rhinoclavis pulcherrima | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Rhinoclavis. |
| Rhinotamides everriculum | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A member of the family Potamididae. |
| Rhombopsis longinquus | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A member of the family Fasciolariidae. |
| Rissoa decorticata | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Rissoa. |
| Rissoa harmeri | Nom. nov | Valid | Faber | Pliocene | | United Kingdom | A species of Rissoa; a replacement name for Rissoa ambigua Harmer (1925). |
| Rissoa obeliscoides | Nom. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Rissoa; a replacement name for Rissoa notabilis Millet (1865). |
| Rissoa torquata | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Rissoa. |
| Rissoina tutongensis | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Rissoina. |
| Scalptia verheckeni | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Scalptia. |
| Scurria rieae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Scurria. |
| Seila petasa | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Seila. |
| Semibittium brebioni | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | |
| Semisulcospira (Biwamelania) kokubuensis | Sp. nov | Valid | Matsuoka & Miura | Pleistocene | Katata Formation | Japan | A species of Semisulcospira. |
| Semisulcospira (Biwamelania) nakamurai | Sp. nov | Valid | Matsuoka & Miura | Pleistocene | Katata Formation | Japan | A species of Semisulcospira. |
| Semisulcospira (Biwamelania) pseudomultigranosa | Sp. nov | Valid | Matsuoka & Miura | Pleistocene | Katata Formation | Japan | A species of Semisulcospira. |
| Semisulcospira (Biwamelania) pusilla | Sp. nov | Valid | Matsuoka & Miura | Pleistocene | Katata Formation | Japan | A species of Semisulcospira. |
| Semisulcospira (Biwamelania) spinulifera | Sp. nov | Valid | Matsuoka & Miura | Pleistocene | Katata Formation | Japan | A species of Semisulcospira. |
| Siphonalia morteni | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Siphonalia. |
| Siphonalia (Pseudoneptunea) semiruta | Sp. nov | Valid | Berezovsky in Berezovsky & Girik | Eocene | | Ukraine | A species of Siphonalia. |
| Siratus hirmetzli | Sp. nov | Valid | Kovács | Middle Miocene | Sámsonháza Formation | Hungary | A species of Siratus. |
| Sisenna inaequistriata | Sp. nov | Valid | Nützel, Kaim & Grădinaru | Middle Triassic (Anisian) | | Romania | A member of the family Gosseletinidae. |
| Sphaerocypraea camboritus | Sp. nov | Valid | Pacaud | Eocene (Lutetian) | | France | A member of the family Ovulidae. |
| Sphaerocypraea gallica | Sp. nov | Valid | Pacaud | Eocene (Bartonian) | Paris Basin | France | A member of the family Ovulidae. |
| Straparollus obtectus | Sp. nov | Valid | Harper | Carboniferous (Mississippian) | Gilmore City Formation | United States ( Iowa) | A member of Euomphaloidea. |
| Subepona amitrovi | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona barbei | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona basilica | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona berezovskyi | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona caelatura | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona cattoi | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona cluzaudi | Sp. nov | Valid | Pacaud | Eocene (Bartonian) | | France | A member of the family Cypraeidae. |
| Subepona dilatata | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona exspectata | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona fusoides | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona gracillima | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona harmonica | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona hungarica | Sp. nov | Valid | Pacaud & Vicián | Eocene (Lutetian) | | Hungary | A member of the family Cypraeidae. |
| Subepona insolita | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona javelina | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona laminata | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona notabilis | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona orbiculata | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona pacaudi | Sp. nov | Valid | Ledon | Eocene (Bartonian) | | France | A member of the family Cypraeidae. |
| Subepona rixatoria | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona romaneki | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona scutula | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona trigonella | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Subepona vultuosa | Sp. nov | Valid | Dolin & Aguerre | Eocene (Bartonian) | | France | |
| Taviania checchii | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | |
| Taviania danaperensis | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | |
| Taviania ukrainica | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | |
| Tectarius isletaensis | Sp. nov | Valid | Vera-Peláez in Martín-González et al. | Late Miocene | | Spain ( Canary Islands) | A species of Tectarius. |
| Teinostoma obesum | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Teinostoma. |
| Terebralia marki | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A species of Terebralia. |
| Terebralia pauli | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A species of Terebralia. |
| Theodoxus susuzianus | Sp. nov | Valid | Harzhauser, Neubauer & Hoşgör | Late Oligocene or early Miocene | Susuz Formation | Turkey | A species of Theodoxus. |
| Timbellus danapris | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | A species of Timbellus. |
| Timbellus priabonicus | Nom. nov | Valid | Pacaud | Eocene (Priabonian) | | Germany | A species of Timbellus; a replacement name for Murex trialatus von Koenen (1889). |
| Tomopleura furcata | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Tomopleura. |
| Tornus superlatus | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Tornus. |
| Trachytriton eliseae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | |
| Tragula saccoi | Sp. nov | Valid | Bongiardino & Micali | Pliocene | | Italy | A species of Tragula. |
| Triphora buscheri | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Triphora. |
| Triphora chauvereauensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Triphora. |
| Triphora fernandezgarcesi | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Triphora. |
| Triphora lherbettorum | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Triphora. |
| Triphora miopygmaea | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Triphora. |
| Triphora sancticlementensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Triphora. |
| Triplostephanus wilfordi | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Triplostephanus. |
| Tristeirostoma | Gen. et sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A member of Pyramidelloidea of uncertain phylogenetic placement. The type species is T. saxaquadrata. |
| Trivia sceauxensis | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Trivia. |
| Triviella angushawkei | Sp. nov | Valid | Fehse & Grego | Eocene | | Australia | A species of Triviella. |
| Triviella korneli | Sp. nov | Valid | Fehse & Grego | Eocene | | Australia | A species of Triviella. |
| Truncaria benjamini | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | |
| Tryonia globosa | Sp. nov | Valid | Guimarães, Ramos & de Simone | Miocene–Pliocene | Solimões Formation | Brazil | A species of Tryonia. |
| Turbonilla tabanellii | Sp. nov | Valid | Bongiardino & Micali | Pliocene | | Italy | A species of Turbonilla. |
| Turricula vibekeae | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Turricula. |
| Turritella amitava | Sp. nov | Valid | Das et al. | Uncertain; Late Jurassic or Miocene | Chari Formation | India | A species of Turritella. |
| Turritella capistrata | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A species of Turritella. |
| Turritella dhosaensis | Sp. nov | Valid | Das et al. | Uncertain; Late Jurassic or Miocene | Chari Formation | India | A species of Turritella. |
| Unedogemmula nuttalli | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Unedogemmula. |
| Valvata koehleri | Sp. nov | Valid | Harzhauser, Neubauer & Hoşgör | Late Oligocene or early Miocene | Susuz Formation | Turkey | A species of Valvata. |
| Valvata mathiasi | Sp. nov | Valid | Esu & Girotti | Early Pliocene | | Italy | A species of Valvata. |
| Vertigo antipygmaea | Sp. nov | Valid | Harzhauser & Neubauer | Miocene | | Poland | A species of Vertigo. |
| Vitrea angustaeumbilicata | Sp. nov | Valid | Harzhauser & Neubauer | Miocene | | Poland | A species of Vitrea. |
| Willungia felix | Sp. nov | Valid | Fehse | Early Miocene | | Australia | A member of Cypraeoidea. |
| Wollastonia beckmanni | Sp. nov | Valid | De Mattia & Groh in De Mattia, Neiber & Groh | Quaternary | | Portugal ( Madeira) | A member of Helicoidea belonging to the family Geomitridae. |
| Wollastonia falknerorum | Sp. nov | Valid | Groh, Neiber & De Mattia in De Mattia, Neiber & Groh | Quaternary | | Portugal ( Madeira) | A member of Helicoidea belonging to the family Geomitridae. |
| Wollastonia inexpectata | Sp. nov | Valid | De Mattia & Groh in De Mattia, Neiber & Groh | Quaternary | | Portugal ( Madeira) | A member of Helicoidea belonging to the family Geomitridae. |
| Wollastonia ripkeni | Sp. nov | Valid | De Mattia & Groh in De Mattia, Neiber & Groh | Quaternary | | Portugal ( Madeira) | A member of Helicoidea belonging to the family Geomitridae. |
| Worthenia (Humiliworthenia) anisica | Sp. nov | Valid | Nützel, Kaim & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Worthenia (Humiliworthenia) microstriata | Sp. nov | Valid | Nützel, Kaim & Grădinaru | Middle Triassic (Anisian) | | Romania | A member of Pleurotomariida belonging to the superfamily Pleurotomarioidea and possibly to the family Wortheniellidae. Originally described as a species of Worthenia; Monari & Dellantonio (2024) transferred it to the genus Dimorphotomaria. |
| Worthenia (Worthenia) dobrogeana | Sp. nov | Valid | Nützel, Kaim & Grădinaru | Middle Triassic (Anisian) | | Romania | |
| Xanthodaphne pederzanii | Sp. nov | Valid | Tabanelli & Bongiardino | Pliocene-Pleistocene | | Italy | A species of Xanthodaphne. |
| Ziba waltercernohorskyi | Sp. nov | Valid | Harzhauser et al. | Miocene (Tortonian) | Seria Formation | Brunei | A species of Ziba. |

## Other molluscs
### Research

* A study on patterns of subtle morphological variation in two assemblages of the Cambrian helcionelloid Mackinnonia rostrata from the Shackleton Limestone of Antarctica and Ajax Limestone of Australia, and an assemblage of M. taconica from the Bastion Formation of Greenland, is published by Jackson & Claybourn (2018).
* The oldest known evidence of trematode parasitism of bivalves in the form of igloo-shaped traces found on shells of the freshwater bivalve Sphaerium is reported from the Upper Cretaceous Judith River Formation (Montana, United States) by Rogers et al. (2018).
* A study evaluating the association of past climate changes with extinction in Cenozoic marine bivalves is published by Edie et al. (2018).
* The oldest known shipworms reported so far, preserved with silicified soft parts, are described from the mid-Cretaceous logs of the Envigne Valley (France) by Robin et al. (2018).
* A study on the taphonomy and paleoecology of oyster mass occurrences from the Cretaceous (Hauterivian) Neuquén Basin (west-central Argentina), dominated by the gryphaeid small oyster Ceratostreon, is published by Toscano, Lazo & Luci (2018).
* Evidence of exceptional preservation in the nacre and prismatic layers of a 66-million-years-old bivalve shell (of a member of the genus Pinna from the Owl Creek Formation, Mississippi, United States) is presented by Myers et al. (2018).
* A study on the allometric growth of shells of the Cenozoic burrowing bivalves Claibornicardia paleopatagonica and Crassatella kokeni from Argentina is published by Perez & Santelli (2018).
* Macrobioerosion of silicate siltstone rocks caused by extant rock-boring mussels is reported from a freshwater section of the Kaladan River (Myanmar) by Bolotov et al. (2018), who note the similarity of recent Kaladan borings to borings assigned to the ichnotaxon Gastrochaenolites anauchen from the Carboniferous deposits of the United States, and interpret their discovery as indicating that rocks with macroborings and fossilized members of rock-boring communities are not necessarily a direct indicator of shallow marine paleo-environments, but may also reflect freshwater habitats.
* A study comparing declines in taxonomic and functional diversity in marine bivalves during the Permian–Triassic extinction event, Cretaceous–Paleogene extinction event and in present times is published by Edie, Jablonski & Valentine (2018).

### New taxa

| Name | Novelty | Status | Authors | Age | Unit | Location | Notes |
| Abra rossii | Nom. nov | Valid | Bonci, Dabove & Piazza | Oligocene | Molare Formation | Italy | A bivalve belonging to the family Semelidae, a species of Abra; a replacement name for Syndesmya intermedia Rovereto (1898). |
| Acanthochitona andegavensis | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton; a species of Acanthochitona. |
| Acanthochitona chauvereauensis | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton; a species of Acanthochitona. |
| Acanthochitona globosa | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton; a species of Acanthochitona. |
| Acutostrea gaviota | Sp. nov | Valid | Squires | Late Eocene | Alegria Formation Gaviota Formation Wheatland Formation | United States ( California) | A true oyster. |
| Adacna yaninae | Sp. nov | Valid | Büyükmeriç & Wesselingh | Late Pleistocene | | Turkey | A cockle. |
| Akardita | Gen. et comb. et sp. nov | Valid | La Perna, Brunetti & Della Bella | Pliocene to recent | | Italy  Spain West Africa | A bivalve belonging to the family Carditidae. The type species is the Pliocene species "Cardita" subrevoluta de Stefani (1888) from Italy; genus also includes new species Akardita iberica from the Pliocene of Spain, as well as extant species Cardita (Venericardia) monodi Nicklès (1953) from West Africa. |
| Aksumya | Gen. et sp. nov | Valid | Kiel | Late Triassic (late Carnian, possibly also Norian) | | Turkey  United States? | A bivalve belonging to the group Anomalodesmata and the superfamily Pholadomyoidea. The type species is A. krystyni. |
| "Anodontia" mioinflata | Sp. nov | Valid | Kiel, Sami & Taviani | Late Miocene | | Italy | A bivalve belonging to the family Lucinidae; a species of Anodontia sensu lato. |
| Astarte (Astarte) paleocenica | Sp. nov | Valid | Amano & Jenkins in Amano, Jenkins & Kurita | Paleocene | Katsuhira Formation | Japan | A species of Astarte. |
| ?Atrina rosenkrantzi | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | Possibly a species of Atrina. |
| Callochiton pouweri | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton, a species of Callochiton. |
| Cardilia edwardsi | Sp. nov | Valid | Signorelli & Raven | Eocene (Bartonian) | Becton Formation | United Kingdom | A bivalve belonging to the family Cardiliidae. |
| Carolinapecten corpulentus | Sp. nov | Valid | Waller | Late Miocene | Peace River Formation | United States ( Florida) | A scallop. |
| Carolinapecten murdockensis | Sp. et 3 subsp. nov | Valid | Waller | Late Miocene | Peace River Formation | United States ( Florida) | A scallop. This species includes new subspecies C. murdockensis druidwilsoni, C. murdockensis murdockensis and C. murdockensis parawatsonensis. |
| Caspiconcha basquensis | Sp. nov | Valid | Jenkins et al. | Early Cretaceous (late Albian) | | Spain | A kalenterid bivalve. |
| Caspiconcha lastsamurai | Sp. nov | Valid | Jenkins et al. | Late Cretaceous (Campanian) | | Japan | A kalenterid bivalve. |
| Caspiconcha raukumaraensis | Sp. nov | Valid | Jenkins et al. | Cretaceous (late Albian to mid-Cenomanian) | | New Zealand | A kalenterid bivalve. |
| Caspiconcha yubariensis | Sp. nov | Valid | Jenkins et al. | Early Cretaceous (late Albian) | | Japan | A kalenterid bivalve. |
| Chesapecten madisonius sarasotensis | Subsp. nov | Valid | Waller | Pliocene | | United States ( Florida) | A scallop. |
| Chesapecten middlesexensis bayshorensis | Subsp. nov | Valid | Waller | Late Miocene | Peace River Formation | United States ( Florida) | A scallop. |
| Chesapecten middlesexensis hunterae | Subsp. nov | Valid | Waller | Late Miocene | Peace River Formation | United States ( Florida) | A scallop. |
| Chesapecten quinarius | Sp. nov | Valid | Waller | Pliocene | | United States ( Florida) | A scallop. |
| Chokekenia | Gen. et comb. nov | Valid | Santelli & del Río | Early Miocene | | Argentina | A scallop. The type species is "Zygochlamys" nicolasi Morra (1985). |
| Connexochiton vivesi | Sp. nov | Valid | Dell'Angelo et al. | | | France | A chiton. |
| Crassatella affinis | Sp. nov | Valid | Berezovsky | Late Eocene | | Ukraine | A bivalve belonging to the family Crassatellidae. |
| Crassatella ballista | Sp. nov | Valid | Berezovsky | Middle Eocene | | Ukraine | A bivalve belonging to the family Crassatellidae. |
| Crassatella calva | Sp. nov | Valid | Berezovsky | Middle Eocene | | Ukraine | A bivalve belonging to the family Crassatellidae. |
| Crassatella ignara | Sp. nov | Valid | Berezovsky | Late Eocene | Mandrikovka Beds | Ukraine | A bivalve belonging to the family Crassatellidae. |
| Crassatella laboriosa | Sp. nov | Valid | Berezovsky | Late Eocene | | Ukraine | A bivalve belonging to the family Crassatellidae. |
| Crassatella necopina | Sp. nov | Valid | Berezovsky | Late Eocene | Mandrikovka Beds | Ukraine | A bivalve belonging to the family Crassatellidae. |
| Crassatella personata | Sp. nov | Valid | Berezovsky | Late Eocene | Mandrikovka Beds | Ukraine | A bivalve belonging to the family Crassatellidae. |
| Crassatella singulata | Sp. nov | Valid | Berezovsky | Late Eocene | Mandrikovka Beds | Ukraine | A bivalve belonging to the family Crassatellidae. Berezovsky (2018) subsequently made it the type species of a new subgenus Crassatella (Furvusa). |
| Crassatina conquisita | Sp. nov | Valid | Berezovsky | Late Eocene | Mandrikovka Beds | Ukraine | A bivalve. |
| Crassatina insolita | Sp. nov | Valid | Berezovsky | Late Eocene | Mandrikovka Beds | Ukraine | A bivalve. Transferred to the genus Chattonia by Berezovsky (2018). |
| Crassatina obscura | Sp. nov | Valid | Berezovsky | Late Eocene | | Ukraine | A bivalve belonging to the family Crassatellidae. |
| Crassatina subcostata | Sp. nov | Valid | Berezovsky | Middle Eocene | | Ukraine | A bivalve. |
| Crassostrea tectonica | Sp. nov | Valid | Squires | Middle Eocene | Coldwater Formation Domengine Formation Matilija Sandstone Santiago Formation | United States ( California) | A true oyster, a species of Crassostrea. |
| Crassovella | Gen. et comb. et 2 sp. nov | Valid | Berezovsky | Late Eocene | | Germany  Poland  Ukraine | A bivalve belonging to the family Crassatellidae. The type species is "Crassatella" raricostata Klushnikov (1958); genus also includes "Crassatella" woodi Koenen (1865), as well as new species C. depulsor and C. faber. |
| Cubitostrea californiana | Sp. nov | Valid | Squires | Late early Eocene | Ardath Shale Llajas Formation | United States ( California) | A true oyster. |
| Cuspidaria anderseni | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Cuspidaria. |
| Cuspidaria heilmannclauseni | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Cuspidaria. |
| Cyrtokolymia bobini | Sp. nov | Valid | Biakov | Middle Permian | | Russia | An Inoceramus-like bivalve belonging to the family Kolymiidae. |
| Debrunia acuta | Sp. nov | Valid | Masse & Fenerci-Masse | Early Cretaceous (Hauterivian) | | France | A rudist bivalve belonging to the family Monopleuridae. |
| Debrunia elongata | Sp. nov | Valid | Masse & Fenerci-Masse | Early Cretaceous (Aptian, possibly Albian) | Serdj Formation | Algeria  Bosnia and Herzegovina  Italy  Spain  Tunisia  Turkey? | A rudist bivalve belonging to the family Monopleuridae. |
| Debrunia heliomorpha | Sp. nov | Valid | Masse & Fenerci-Masse | Early Cretaceous (Hauterivian) | | France | A rudist bivalve belonging to the family Monopleuridae. |
| Debrunia massiliana | Sp. nov | Valid | Masse & Fenerci-Masse | Early Cretaceous (Valanginian) | | France | A rudist bivalve belonging to the family Monopleuridae. |
| Debrunia tunesiana | Sp. nov | Valid | Masse & Fenerci-Masse | Early Cretaceous (Hauterivian) | Bou Hedma Formation | Tunisia | A rudist bivalve belonging to the family Monopleuridae. |
| Debrunia ucetiae | Sp. nov | Valid | Masse & Fenerci-Masse | Early Cretaceous (Barremian and Aptian) | | France | A rudist bivalve belonging to the family Monopleuridae. |
| Elliptiolucina neozelandica | Sp. nov | Valid | Amano, Little & Campbell | Miocene | Bexhaven Limestone | New Zealand | A bivalve belonging to the family Lucinidae. |
| Eucrassatella depulsoris | Sp. nov | Valid | Berezovsky | Middle Eocene | | Ukraine | A bivalve belonging to the family Crassatellidae. |
| Hanleya sancticlementensis | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton. |
| Hanleya sossoi | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton. |
| Hebecardium lapideus | Sp. nov | Valid | Berezovsky | Eocene | | Ukraine | A cockle. |
| Incanopsis fastigiata | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A bivalve belonging to the family Noetiidae. |
| Incatina | Gen. et sp. nov | Valid | DeVries | Early Eocene | Pisco Basin (Caballas Formation) | Peru | A bivalve belonging to the family Crassatellidae. The type species is I. collinsae. |
| Ischnochiton nitidum | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton, a species of Ischnochiton. |
| Ischnochiton renardi | Sp. nov | Valid | Dell'Angelo et al. | | | France | A chiton, a species of Ischnochiton. |
| Kasimlara | Gen. et sp. nov | Valid | Kiel | Late Triassic (late Carnian) | | Turkey | A bivalve belonging to the group Carditida and the family Kalenteridae. The type species is K. kosuni. |
| Kolymia peregoedovi | Sp. nov | Valid | Biakov & Kutygin | Middle Permian | | Russia ( Sakha Republic) | A bivalve. |
| Kolymia pontoneica | Sp. nov | Valid | Biakov | Middle Permian | | Russia | An Inoceramus-like bivalve belonging to the family Kolymiidae. |
| Kolymia posneri | Sp. nov | Valid | Muromzeva, Kusnezov & Biakov in Biakov et al. | Middle Permian | Delezhinskaya Formation | Russia | An Inoceramus-like bivalve belonging to the family Kolymiidae. |
| Kolymia simkiniformis | Sp. nov | Valid | Biakov | Middle Permian | | Russia | An Inoceramus-like bivalve belonging to the family Kolymiidae. |
| Leptochiton aturriensis | Sp. nov | Valid | Dell'Angelo et al. | | | France | A chiton, a species of Leptochiton. |
| Leptochiton lateropustulosus | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton, a species of Leptochiton. |
| Leptochiton parvus | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton, a species of Leptochiton. |
| Leptochiton renauleauensis | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton, a species of Leptochiton. |
| Leptochiton terryiverseni | Sp. nov | Valid | Hybertsen & Kiel | Middle Eocene | Humptulips Formation | United States ( Washington) | A chiton, a species of Leptochiton. |
| Lepidopleurus gallicus | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton, a species of Lepidopleurus. |
| Lepidopleurus pseudobenoisti | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton, a species of Lepidopleurus. |
| Lucilina saubadeae | Sp. nov | Valid | Dell'Angelo et al. | | | France | A chiton, a species of Lucilina. |
| Lucinoma saetheri | Sp. nov | Valid | Amano, Little & Campbell | Miocene | Bexhaven Limestone Ihungia Limestone | New Zealand | A bivalve belonging to the family Lucinidae. |
| Mactra (Sarmatymactra) belokrysia | Sp. nov | Valid | Berezovsky in Berezovsky & Systerova | Miocene | | Ukraine | A bivalve, a species of Mactra. |
| Meekopecten | Gen. et comb. nov | Valid | Waterhouse | Carboniferous | Stanton Formation | Canada ( Yukon)  United States ( Kansas) | A bivalve belonging to the group Pectinida. The type species is "Acanthopecten" meeki Newel (1938). |
| Meganodontia haunuiensis | Sp. nov | Valid | Amano, Little & Campbell | Miocene | Ihungia Limestone | New Zealand | A bivalve belonging to the family Lucinidae. |
| Megaxinus stironensis | Sp. nov | Valid | Kiel & Taviani | Pliocene | Lugagnano Formation | Italy | A bivalve belonging to the family Lucinidae. |
| Modiolus mortenseni | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Modiolus. |
| Moirechlamys | Gen. et comb. nov | Valid | Santelli & del Río | Late Miocene–early Pliocene | | Argentina | A scallop. The type species is "Pecten" actinodes Sowerby (1846); genus also includes "Chlamys" aurorae Feruglio (1954). |
| Monodacna pseudocolorata | Sp. nov | Valid | Büyükmeriç & Wesselingh | Late Pleistocene | | Turkey | A cockle. |
| Mulinoides plenicostatus | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A bivalve belonging to the family Mactridae. |
| Neuquemya | Gen. et sp. nov | Valid | Damborenea | Early Jurassic (Pliensbachian) | | Argentina | A bivalve, possibly belonging to the family Cuspidariidae. Genus includes new species N. leanzaorum. |
| Nuculana acutilineata | Sp. nov | Valid | Hybertsen & Kiel | Middle Eocene | Humptulips Formation | United States ( Washington) | A bivalve. |
| Oryxia | Gen. et sp. nov | Valid | Rineau & Villier | Late Cretaceous (Cenomanian) | | Slovenia | A rudist bivalve. Genus includes new species O. sulcata. |
| Parachiton palmorum | Sp. nov | Valid | Dell'Angelo et al. | | | France | A chiton, a species of Parachiton. |
| Permianaia | Gen. et sp. nov | Valid | Silantiev, Urazaeva & Golubev | Late Permian | | Russia ( Vladimir Oblast) | A bivalve belonging to the family Naiaditidae. Genus includes new species P. gusevi. |
| Phygraea badgeri | Sp. nov | Valid | Squires | Late middle Eocene to early late Eocene | Coldwater Formation Lower Gaviota Formation | United States ( California) | A foam oyster. |
| Pixiechlamys | Gen. et comb. nov | Valid | Santelli & del Río | Early Miocene | | Argentina | A scallop. The type species is "Pecten" quemadensis Ihering (1897). |
| Pleuriocardia (Incacardium) schneideri | Sp. nov | Valid | DeVries | Early Paleogene | Pisco Basin (Caballas Formation) | Peru | A cockle. |
| Poromya katsuhiraensis | Sp. nov | Valid | Amano & Jenkins in Amano, Jenkins & Kurita | Paleocene | Katsuhira Formation | Japan | A bivalve. |
| Pteria thomseni | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | | Denmark | A species of Pteria. |
| Pulvinites elenae | Sp. nov | Valid | Jagt | Late Cretaceous (Maastrichtian) | | Netherlands | A bivalve belonging to the family Pulvinitidae. |
| Pycnogryphaea | Gen. et comb. nov | Valid | Kosenko | Early Cretaceous (Berriasian) | | Crimean Peninsula | A bivalve belonging to the family Gryphaeidae and the subfamily Pycnodonteinae. The type species is "Gryphaea" weberae Yanin in Tschelzova (1969). |
| Rhyssoplax assurrectum | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton, a species of Rhyssoplax. |
| Schizochiton tasteti | Sp. nov | Valid | Dell'Angelo et al. | | | France | A chiton, a species of Schizochiton. |
| Terzileria | Gen. et sp. nov | Valid | Kiel | Late Triassic (late Carnian, possibly also Norian) | | Turkey  United States? | A bivalve belonging to the group Carditida and the family Kalenteridae. The type species is T. gregaria. |
| Thyasira (Thyasira) oliveri | Sp. nov | Valid | Amano & Jenkins in Amano, Jenkins & Kurita | Paleocene | Katsuhira Formation | Japan | A species of Thyasira. |
| Tonicella redoniensis | Sp. nov | Valid | Dell'Angelo et al. | Miocene (Tortonian) | | France | A chiton, a species of Tonicella. |