# 2020 in paleomalacology

This list 2020 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 2020, as well as other significant discoveries and events related to molluscan paleontology that are scheduled to occur in the year 2020.

## Ammonites
### New taxa

| Name | Novelty | Status | Authors | Age | Type locality | Country | Notes |
| Acrimeroceras hoppeckense | Sp. nov | Valid | Korn & Buchwald in Korn et al. | Late Devonian | | Germany | |
| Acrimeroceras ropicense | Sp. nov | Valid | Korn, Bartzsch & Weyer in Korn et al. | Late Devonian | | | |
| Acrimeroceras saalense | Sp. nov | Valid | Korn, Bartzsch & Weyer in Korn et al. | Late Devonian | | | |
| Acutimitoceras alabasense | Sp. nov | Valid | Nikolaeva | Devonian-Carboniferous boundary | | Kazakhstan | |
| Acutimitoceras dzhanganense | Sp. nov | Valid | Nikolaeva | Devonian-Carboniferous boundary | | Kazakhstan | |
| Almites hayasakai | Sp. nov | Valid | Ehiro & Ozawa | Permian (Asselian) | Taishaku Limestone | Japan | |
| Angolaites elegans | Sp. nov | Valid | Kennedy in Gale & Kennedy | Early Cretaceous (Albian) | Lower Duck Creek | United States ( Texas) | A member of the family Brancoceratidae. |
| Aspidoceras schweigertense | Sp. nov | Valid | Sarti | Late Jurassic (Tithonian) | Rosso Ammonitico Veronese Formation | Italy | |
| Aulacostephanus camericensis | Sp. nov | Valid | Cope & Etches | Late Jurassic (Kimmeridgian) | | United Kingdom | |
| Baidites obesus | Sp. nov | Valid | Jattiot, Bucher & Brayard | Early Triassic | | Indonesia | |
| Boesites biconcavus | Sp. nov | Valid | Ehiro & Ozawa | Permian (Asselian) | Taishaku Limestone | Japan | |
| Borissjakoceras falcatum | Sp. nov | Valid | Kennedy | Late Cretaceous (Cenomanian) | | Tunisia | A member of the family Binneyitidae. |
| ?Bouleiceras betetensis | Sp. nov | Valid | Martínez & Joral | Early Jurassic (Toarcian) | | Spain | A member of the family Hildoceratidae. |
| Bouleiceras ibericum | Sp. nov | Valid | Martínez & Joral | Early Jurassic (Toarcian) | | Spain | A member of the family Hildoceratidae. |
| Cagliceras baldii | Sp. nov | Valid | Kovács, Dunai & Evanics | Early Jurassic (Toarcian) | | Hungary | A member of the family Erycitidae. |
| Cagliceras wegeneri | Sp. nov | Valid | Kovács, Dunai & Evanics | Early Jurassic (Toarcian) | | Hungary | A member of the family Erycitidae. |
| Carthaginites elegans | Sp. nov | Valid | Kennedy | Late Cretaceous (Cenomanian) | | Algeria | A member of the family Turrilitidae. |
| Churkites warei | Sp. nov | Valid | Jattiot, Bucher & Brayard | Early Triassic | | Indonesia | |
| Collignoniceras badilleti | Sp. nov | Valid | Amédro & Châtelier in Amédro et al. | Late Cretaceous (Turonian) | | France | |
| Collignoniceras hourqueigi | Sp. nov | Valid | Amédro & Châtelier in Amédro et al. | Late Cretaceous (Turonian) | | France | |
| Collignoniceras vigennum | Sp. nov | Valid | Amédro & Châtelier in Amédro et al. | Late Cretaceous (Turonian) | | France | |
| Conlinites evolutum | Sp. nov | Valid | Kennedy | Early Cretaceous (Albian) | | Algeria | A member of the family Brancoceratidae. |
| Coquandiceras | Gen. et comb. nov | Valid | Kennedy | Late Cretaceous (Cenomanian) | | Algeria  Tunisia | A member of the family Acanthoceratidae belonging to the subfamily Mantelliceratinae. The type species is "Ammonites" jubae Coquand (1880); genus also includes "Ammonites" villei Coquand (1862). |
| Cryptoturrilites | Gen. et sp. nov | Valid | Kennedy | Late Cretaceous (Cenomanian) | | Tunisia | A member of the family Turrilitidae. The type species is C. tenuicostatus. |
| Elobiceras (Craginites) simplex | Sp. nov | Valid | Kennedy in Gale & Kennedy | Early Cretaceous (Albian) | Lower Duck Creek | United States ( Texas) | A member of the family Brancoceratidae. |
| Elobiceras (Craginites) sparcicostatum | Sp. nov | Valid | Kennedy in Gale & Kennedy | Early Cretaceous (Albian) | Lower Duck Creek | United States ( Texas) | A member of the family Brancoceratidae. |
| Flemingites lidakensis | Sp. nov | Valid | Jattiot, Bucher & Brayard | Early Triassic | | Indonesia | |
| Goniatites abaiensis | Sp. nov | Valid | Korn et al. | Carboniferous (Viséan) | Baktysai Formation | Kazakhstan | |
| Goniatites zhankurganensis | Sp. nov | Valid | Korn et al. | Carboniferous (Viséan) | Baktysai Formation | Kazakhstan | |
| Graysonites elegans | Sp. nov | Valid | Kennedy | Late Cretaceous (Cenomanian) | | Algeria | A member of the family Acanthoceratidae. |
| Gregoryceras boreale | Sp. nov | Valid | Mitta & Stupachenko | Late Jurassic (Oxfordian) | | Russia | A member of the family Aspidoceratidae. |
| Hoevelia megalomanica | Sp. nov | Valid | Korn, Hairapetian & Gholamalian | Late Devonian | | Iran | |
| Homeomorphites | Gen. et sp. et comb. nov | Valid | Bert, Bersac & Canut | Early Cretaceous (Hauterivian to Barremian) | | Argentina  Chile | A member of the family Neocomitidae. The type species is H. aguirreurretae; genus also includes H. ploszkiewiczi (Riccardi and Aguirre-Urreta, 1989) and H. varicostatus (Riccardi and Aguirre-Urreta, 1989). Announced in 2019; the final version of the article naming was published in 2020. |
| Homoceratoides wangchengi | Sp. nov | Valid | Korn & Wang in Korn et al. | Carboniferous (Bashkirian) | Jingyuan Formation | China | A member of the family Bisatoceratidae. Announced in 2020; the final version of the article naming was published in 2021. |
| Hoploscaphites peterseni | Sp. nov | Valid | Landman et al. | Late Cretaceous | Bearpaw Shale Pierre Shale | United States ( Montana Wyoming) | |
| Howarthiceras | Gen. et comb. nov | Valid | Zakharov & Rogov | Upper Jurassic (Tithonian) | | United States ( California) | A new genus for "Groebericeras" baylei Imlay & Jones. |
| Hybonoticeras pseudoharpephorum | Sp. nov | Valid | Sarti | Late Jurassic (Tithonian) | Rosso Ammonitico Veronese Formation | Italy | |
| Hypowaagenia | Gen. et sp. nov | Valid | Schweigert & Schlampp | Late Jurassic (Kimmeridgian) | Arzberg Formation | Germany  Pakistan? | A member of the family Aspidoceratidae. The type species is H. endressi; genus might also include "Aspidoceras" acanthomphalum Zittel (1870). |
| Kosmoclymenia ebbighauseni | Sp. nov | Valid | Korn | Devonian (Famennian) | | Morocco | |
| Lasswitzia | Gen. et comb. nov | Valid | Kennedy in Gale & Kennedy | Early Cretaceous (Albian) | Lower Duck Creek Formation | United States ( Texas) | A member of the family Brancoceratidae. The type species is "Schloenbachia austinensis" Roemer var. minima Lasswitz (1904) (raised to the rank of a separate species Lasswitzia minima). |
| Lenicostites | Gen. et comb. nov | Valid | Bert, Bersac & Canut | Early Cretaceous (Barremian) | | France | A member of Ancyloceratoidea belonging to the new family Lenicostitidae. The type species is "Hemihoplites" rusticus Vermeulen (1996). Announced in 2019; the final version of the article naming was published in 2020. |
| Lithacoceras főzyi | Sp. nov | Valid | Sarti | Late Jurassic (Tithonian) | Rosso Ammonitico Veronese Formation | Italy | |
| Litophragmatoceras curiosus | Sp. nov | Valid | Kennedy | Late Cretaceous (Cenomanian) | | Algeria | A member of the family Flickiidae. |
| Lytoceras pseudorsinii | Sp. nov | Valid | Sarti | Late Jurassic (Tithonian) | Rosso Ammonitico Veronese Formation | Italy | |
| Marcouxia chaiburiensis | Sp. nov | Valid | Tongtherm et al. | Early Triassic | Chaiburi | Thailand | |
| Margoceras | Gen. et sp. nov | Valid | Borissenkov | Permian (Cisuralian) | | Russia ( Nenets Autonomous Okrug) | A member of the family Paragastrioceratidae. Genus includes new species M. boreale. |
| Mittaites | Gen. et comb. nov | Valid | Frau et al. | Early Cretaceous (Berriasian) | | Russia | The type species is "Mazenoticeras" ceccai. Announced in 2020; the final version of the article naming it was published in 2021. |
| Mortoniceratoides elegans | Sp. nov | Valid | Kennedy in Gale & Kennedy | Early Cretaceous (Albian) | Kiamichi | United States ( Texas) | A member of the family Brancoceratidae. |
| Muessenbiaergia bockwinkeli | Sp. nov | Valid | Korn | Devonian (Famennian) | | Morocco | A member of the family Kosmoclymeniidae. |
| Neophlycticeras algeriense | Sp. nov | Valid | Kennedy | Late Cretaceous (Cenomanian) | | Algeria | A member of the family Lyelliceratidae. |
| Neophyllites lavernockensis | Sp. nov | Valid | Hodges | Early Jurassic (Hettangian) | White Lias Formation | United Kingdom | Announced in 2020; the final version of the article naming it was published in 2021. |
| Neotelodactylites | Gen. et comb. nov | Valid | Jattiot, Gris & Trincal | Early Jurassic (Toarcian) | | France  Italy | A new genus for "Peronoceras" eucosmum Lippi Boncambi (1947). |
| Neouddenites echiensis | Sp. nov | Valid | Kutygin | Permian | | Russia ( Sakha) | A member of the family Medlicottiidae. |
| Paracraginites | Gen. et sp. nov | Valid | Kennedy in Gale & Kennedy | Early Cretaceous (Albian) | Lower Duck Creek | United States ( Texas) | A member of the family Brancoceratidae. The type species is P. conlini. |
| Paracrioceras giraudae | Sp. nov | Valid | Vermeulen et al. | Early Cretaceous | | France | |
| Paragastrioceras cantabrignianum | Sp. nov | Valid | Borissenkov | Permian (Cisuralian) | | Russia ( Nenets Autonomous Okrug) | A member of the family Paragastrioceratidae. |
| Paraspidites bicarinatus | Sp. nov | Valid | Jattiot, Bucher & Brayard | Early Triassic | | Indonesia | |
| Paratornoceras ayense | Sp. nov | Valid | Korn & Buchwald in Korn et al. | Late Devonian | | | |
| Paratornoceras harounense | Sp. nov | Valid | Korn & Ebbighausen in Korn et al. | Late Devonian | | | |
| Paratornoceras peterseni | Sp. nov | Valid | Korn & Buchwald in Korn et al. | Late Devonian | | | |
| Paratornoceras thuringense | Sp. nov | Valid | Korn, Bartzsch & Weyer in Korn et al. | Late Devonian | | | |
| Pernaceras leroyi | Sp. nov | Valid | Vermeulen et al. | Early Cretaceous | | France | |
| Pervinquieria (Deiradoceras) serpentiforme | Sp. nov | Valid | Kennedy in Gale & Kennedy | Early Cretaceous (Albian) | Lower Duck Creek | United States ( Texas) | A member of the family Brancoceratidae. |
| Pervinquieria (Pervinquieria) asper | Sp. nov | Valid | Kennedy in Gale & Kennedy | Early Cretaceous (Albian) | Lower Duck Creek | United States ( Texas) | A member of the family Brancoceratidae. |
| Procrioceratites | Gen. et sp. et comb. nov | Valid | Vermeulen et al. | Early Cretaceous | | France | A member of the family Crioceratitidae. The type species is P. etiennei; genus also includes P. primitivus (Reboulet, 1996) and P. barrabei (Sarkar, 1955). |
| Protacanthoceras sottaraense | Sp. nov | Valid | Kennedy | Late Cretaceous (Cenomanian) | | Algeria | A member of the family Acanthoceratidae. |
| Protacanthodiscus guerrai | Sp. nov | Valid | Sarti | Late Jurassic (Tithonian) | Rosso Ammonitico Veronese Formation | Italy | |
| Prouddenites evolutus | Sp. nov | Valid | Kutygin | Permian | | Russia ( Sakha) | A member of the family Medlicottiidae. |
| Pseudodiscosphinctes pseudorhodanicus | Sp. nov | Valid | Caracuel & Sarti in Sarti | Late Jurassic (Tithonian) | Rosso Ammonitico Veronese Formation | Italy | |
| Pseudolissoceras atesinum | Sp. nov | Valid | Sarti | Late Jurassic (Tithonian) | Rosso Ammonitico Veronese Formation | Italy | |
| Pseudolongaeviceras | Gen. et sp. nov | Valid | Alifirov & Knyazev | Middle Jurassic (Callovian) | | Russia | A member of the family Cardioceratidae. Genus includes new species P. densicostatum. |
| Pseudoxybeloceras simplex | Sp. nov | Valid | Kennedy | Late Cretaceous | | United Kingdom | |
| Ptychites embreei | Sp. nov | Valid | Bischof & Lehmann | Middle Triassic (Anisian) | Favret Formation | United States ( Nevada) | |
| Reymenticoceras ornatum | Sp. nov | Valid | Kennedy | Late Cretaceous (Turonian) | | Colombia | A member of the family Acanthoceratidae belonging to the subfamily Mammitinae. Announced in 2020; the final version of the article naming it was published in 2021. |
| Romaniceras (Romaniceras) marigniacum | Sp. nov | Valid | Amédro & Châtelier in Amédro et al. | Late Cretaceous (Turonian) | | France | |
| Roopnarinites | Gen. et comb. nov | Valid | Jattiot, Bucher & Brayard | Early Triassic | | Indonesia | Genus includes "Meekoceras" paucesculptatum Welter (1922). |
| Scaphites occlusus | Sp. nov | Valid | Kennedy | Late Cretaceous (Cenomanian) | | Algeria  Tunisia | A member of the family Scaphitidae. |
| Schaireria (Schaireria) vetera | Sp. nov | Valid | Sarti | Late Jurassic (Tithonian) | Rosso Ammonitico Veronese Formation | Italy | |
| Shumardites umbilicatus | Sp. nov | Valid | Ehiro & Ozawa | Permian (Asselian) | Taishaku Limestone | Japan | |
| Sormaites | Gen. et sp. nov | Valid | Muramiya & Shigeta | Late Cretaceous (Turonian) | | Japan | A member of the family Diplomoceratidae. Genus includes new species S. teshioensis. |
| Stoliczkaia (Stoliczkaia) djerissaensis | Sp. nov | Valid | Kennedy | Early Cretaceous (Albian) | | Tunisia | A member of the family Lyelliceratidae. |
| Subflemingites bihatiense | Sp. nov | Valid | Jattiot, Bucher & Brayard | Early Triassic | | Indonesia | |
| Tescheniceras | Gen. et comb. nov | Valid | Vašíček | Early Cretaceous (Valanginian to Hauterivian) | | Austria  France  Italy  Morocco  Romania  Serbia  Slovakia  Spain  Switzerland | A member of the family Neocomitidae. The type species is "Neocomites (Teschenites)" flucticulus Thieuloy (1977); genus also includes "Neocomites (Teschenites)" callidiscus Thieuloy (1971), "Teschenites" subflucticulus Reboulet (1996), "Neocomites (Teschenites)" pachydicranus Thieuloy (1977) and "Teschenites" subpachydicranus Reboulet (1996). |
| Tumaroceras paveli | Sp. nov | Valid | Borissenkov | Permian (Cisuralian) | | Russia ( Nenets Autonomous Okrug) | A member of the family Paragastrioceratidae. |
| Vidrioceras ellipticum | Sp. nov | Valid | Ehiro & Ozawa | Permian (Asselian) | Taishaku Limestone | Japan | |
| Virgatosimoceras propecostatum | Sp. nov | Valid | Sarti | Late Jurassic (Tithonian) | Rosso Ammonitico Veronese Formation | Italy | |
| Yezoceras elegans | Sp. nov | Valid | Aiba, Karasawa & Iwasaki | Late Cretaceous (Coniacian) | | Japan | A member of the family Nostoceratidae. |

### General research

* A study aiming to determine the drag force experienced by a wide range of ammonite shell shapes is published by Hebdon, Ritterbush & Choi (2020).
* A study evaluating how different parameters affected the ammonite shell's response to water pressure, aiming to determine whether the ammonite septa strengthened the shell against pressure at increasing water depths, is published by Lemanis (2020).
* A study on global patterns of ammonite diversification and extinction from the Early Devonian (Emsian) to the Early Triassic (Induan) is published by Whalen, Hull & Briggs (2020).
* A study on the abundance and size distribution of small specimens of Baculites and Hoploscaphites at eight cold methane seep sites in the Upper Cretaceous Pierre Shale (South Dakota, United States) is published by Rowe et al. (2020), who interpret their findings as indicating that newly hatched ammonites lived in close proximity to seep fluids emerging at the sediment-water interface and the associated microbial food web.
* A study on changes of hydrostatic properties of three species of Didymoceras during their ontogeny is published by Peterman et al. (2020).

## Other cephalopods
### New taxa

| Name | Novelty | Status | Authors | Age | Type locality | Country | Notes |
| Alexoceras | Gen. et sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | A nautiloid related to Temnocheilus. Genus includes new species A. mazaevi. |
| Ancistroceras ristnensis | Sp. nov | Valid | Aubrechtová & Meidla | Ordovician | | Estonia | |
| Ancistroceras vahikuelaensis | Sp. nov | Valid | Aubrechtová & Meidla | Ordovician | | Estonia | |
| Bairstowius amaliae | Sp. nov | Valid | Rita et al. | Early Jurassic (Pliensbachian) | Lemede | Portugal | A belemnite belonging to the family Hastitidae. |
| Barskoceras | Gen. et sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | A probable member of Oncocerida. Genus includes new species B. mirum. |
| Chromatoceras | Gen. et comb. nov | Valid | Turek & Manda | Silurian (Pridoli) | Kopanina | Czech Republic | A member of Oncocerida belonging to the family Oonoceratidae. The type species is "Cyrtoceras" veteranum Barrande (1866); genus also includes "Cyrtoceras" constringens Barrande (1866). |
| Domatoceras bashkiricum | Sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | |
| Domatoceras sterlitamakense | Sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | |
| Enigmabelus | Gen. et 3 sp. nov | Valid | Keupp & Fuchs | Early Jurassic (Pliensbachian) | Amaltheenton | Germany | A member of Belemnitina. Genus includes new species E. doppelsteini, E. micros and possibly ? E. leptos. |
| Houdongoceras | Gen. et sp. nov | Valid | Yang et al. | Permian Guadalupian | Gufeng Formation | China | A member of Orthocerida. Genus includes new species H. chaohuensis. Announced in 2020; the final version of the article naming it was published in 2021. |
| Leniceras | Gen. et sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | A nautiloid belonging to the family Liroceratidae. Genus includes new species L. ovale. |
| Liroceras shakhtauense | Sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | A nautiloid belonging to the family Liroceratidae. |
| Lituites nehatuensis | Sp. nov | Valid | Aubrechtová & Meidla | Ordovician | | Estonia | |
| Megaglossoceras barskovi | Sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | A nautiloid belonging to the family Ephippioceratidae. |
| Mosquoceras planum | Sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | |
| Shatoceras | Gen. et sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | A nautiloid related to Domatoceras. Genus includes new species S. umbilicatum. |
| Shikhanonautilus | Gen. et sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | A nautiloid belonging to the family Liroceratidae. Genus includes new species S. siphonoventralis. |
| Sholakoceras formosum | Sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | |
| Thyoceras | Gen. et sp. nov | Valid | Leonova & Shchedukhin | Early Permian | | Russia ( Bashkortostan) | A nautiloid related to Permonautilus. Genus includes new species T. involutum. |
| Trematoceras watanabei | Sp. nov | Valid | Niko & Ehiro | Middle Triassic (Anisian) | Fukkoshi Formation | Japan | |

### General research

* A study aiming to determine whether the development of chamber volume in fossil cephalopod phragmocones conveys information about their physiology is published by Tajika et al. (2020), who evaluate the implications of their findings for the knowledge of the ecology and extinction selectivity of fossil cephalopods.
* A study on the spatial distribution of Givetian oncocerid fossils from the Hamar Laghdad ridge (eastern Anti-Atlas, Morocco), evaluating its implications for the knowledge of the life cycle of these cephalopods, is published by Pohle et al. (2020).
* Jurassic nautiloid Somalinautilus antiquus, previously known only from the Kimmeridgian strata of Ethiopia, is reported from the Kimmeridgian of Southern Germany by Schweigert (2020), who also reports the first finding of the species Somalinautilus clavifer the Middle Jurassic (Bathonian) of Southern Germany.
* A study on the reproductive strategies of fossil coleoids, based on data from shells of belemnoids, spirulids and sepiids, is published by Fuchs et al. (2020).
* A specimen of Plesioteuthis preserved with an associated tooth of a pterosaur is reported from the Upper Jurassic Altmühltal Formation (Germany) by Hoffmann et al. (2020), who evaluate the implications of this finding for the knowledge of the likely habitat of Plesioteuthis.

## Gastropods
### New taxa

| Name | Novelty | Status | Authors | Age | Type locality | Country | Notes |
| Acanthinula karsdorfensis | Sp. nov | Valid | Kadolsky | Early Eocene | | Germany | A species of Acanthinula sensu lato. |
| Acroloxus aspis | Sp. nov | Valid | Kadolsky | Early Eocene | | Germany | A species of Acroloxus. |
| Acroloxus korys | Sp. nov | Valid | Kadolsky | Early Eocene | | Germany | A species of Acroloxus. |
| "Acteon" distinctus | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | |
| Afrodontops | Gen. et 2 sp. nov | Valid | Kadolsky | Early Eocene | | Germany | A member of the family Charopidae. The type species is A. europaea; genus also includes A. comes. |
| Alanstukella | Gen. et comb. nov | Valid | Mazaev | Carboniferous (Kasimovian) to Permian (Sakmarian) | | Russia | A member of the family Trochonematidae. The type species is A. rossica (Stuckenberg, 1905). |
| Albinulopsis | Gen. et sp. et comb. nov | Valid | Kadolsky | Eocene | | France Germany | A member of the family Gastrocoptidae. The type species is A. gibba; genus also includes "Pupa" bonneti Cossmann (1907). |
| Altotomaria | Gen. et sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | Genus includes new species A. reticulata. |
| Ammonicera oliveri | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Ammonicera. |
| Andonia delgadoi | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | |
| Andonia wilhelminamariae | Sp. nov | Valid | Landau & Mulder | Pliocene | | Italy Spain | |
| Anomphalus murankaensis | Sp. nov | Valid | Mazaev | Permian (Sakmarian) | | Russia | |
| Apachella noinskyi | Sp. nov | Valid | Mazaev | Permian (Sakmarian) | | Russia | |
| Apachella thailandensis | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Aphanitoma roesti | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Aphanitoma. |
| Aquitanobursa javana | Sp. nov | Valid | Landau et al. | Miocene | | Indonesia | A member of the family Bursidae. |
| Assiminea striatura | Sp. nov | Valid | Bullis et al. | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A species of Assiminea. |
| Auristomia insulsa | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Auristomia. |
| Bactrocythara pascaleae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Bactrocythara. |
| Balticopta | Gen. et sp. nov | Valid | Balashov & Perkovsky | Eocene (Priabonian) | Baltic amber | Russia ( Kaliningrad Oblast) | A member of the family Gastrocoptidae. The type species is B. gusakovi. |
| Bania goehlichae | Sp. nov | Valid | Mandic, Harzhauser & Neubauer | Middle Miocene | | Bosnia and Herzegovina | |
| Bela henkmulderi | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Bela. |
| Bela keukelaari | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Bela. |
| Bela pseudomegastoma | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Bela. |
| Bela pseudovulpecula | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Bela. |
| Bela redoniana | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Bela. |
| Bela scarponii | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Bela. |
| Bela sceauxensis | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Bela. |
| Belgrandiella? nichterli | Sp. nov | Valid | Harzhauser et al. | Late Eocene | | Spain | Possibly a species of Belgrandiella. |
| Bellerophon erawanensis | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Biarmeaspira mazaevi | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Buccinaria minuscula | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Buccinaria. |
| Calculocochlea | Gen. et sp. nov | Valid | Juárez-Ruiz, Matamales-Andreu & Kadolsky | Early Oligocene | | Spain | A member of the family Vidaliellidae. Genus includes new species C. oliveri. |
| Callitrochilia | Gen. et comb. nov | Valid | Gain, Belliard & Le Renard | Eocene | | France | A member of the family Calliostomatidae. The type species is "Calliostoma (Eutrochus)" ditropis Cossmann & Pissarro (1902). |
| Calogoniodiscus pyrenaicus | Sp. nov | Valid | Harzhauser et al. | Late Eocene | | Spain | |
| Campanile madagasikara | Sp. nov | | Pacaud | Late Miocene | | Madagascar | A species of Campanile. |
| Careliopsis gallica | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Careliopsis. |
| Carychiopsina | Gen. et comb. nov | Valid | Kadolsky | Late Oligocene and early Miocene | | Czech Republic Poland | A member of the family Ellobiidae belonging to the subfamily Carychiinae. The type species is "Pupa" schwageri Reuss (1868); genus also includes C. costulata (Sandberger, 1862), C. prisyazhnyuki (Stworzewicz, 1999) and possibly C.? surai (Stworzewicz, 1999). |
| Carychium bachi | Sp. nov | Valid | Kadolsky | Early Eocene | | Germany | A species of Carychium. |
| Carychium vagum | Sp. nov | Valid | Kadolsky | Early Eocene | | Germany | A species of Carychium. |
| Casmaria primitiva | Sp. nov | Valid | Landau et al. | Miocene | | Indonesia | A species of Casmaria. |
| Cassis robusta | Sp. nov | Valid | Landau et al. | Miocene | | Indonesia | A species of Cassis. |
| Cassitriton | Gen. et sp. nov | Valid | Craig & Tracey in Craig et al. | Eocene (Lutetian) | | France | A member of the family Cymatiidae. The type species is C. magnificus Craig, Tracey & Gain. |
| Cataegis ramosi | Sp. nov | Valid | Kiel, Aguilar & Kase | Late Pliocene | Bata Formation | Philippines | A species of Cataegis. |
| Cheilospicata cedrus | Sp. nov | Valid | Garvie in Garvie, Goedert & Janssen | | | United States | |
| Chemnitzia miogallica | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Chemnitzia. |
| Chemnitzia robusticostata | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Chemnitzia. |
| Chilodonta tricostatula | Sp. nov | Valid | Gründel, Hostettler & Gfeller | Late Jurassic (Oxfordian) | St-Ursanne-Formation | Switzerland | A species of Chilodonta. |
| Clanculus (Clanculopsis) krachi | Sp. nov | Valid | Nosowska | Middle Miocene | | Poland  Ukraine | A species of Clanculus. |
| Clathrella semilaeve | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | |
| Clathromangelia daisyae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Clathromangelia. |
| Clathromangelia densecostata | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Clathromangelia. |
| Clathromangelia hakkennesi | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Clathromangelia. |
| Clathromangelia helwerdae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Clathromangelia. |
| Clathromangelia karinneae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Clathromangelia. |
| Clathromangelia pereirae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Clathromangelia. |
| Clathromangelia vannieulandei | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Clathromangelia. |
| Clathromangelia wopkeae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Clathromangelia. |
| Clavatula sceauxensis | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Clavatula. |
| Clio gailae | Sp. nov | Valid | Goedert & Janssen in Garvie, Goedert & Janssen | | | United States ( Washington) | A species of Clio. |
| Cochleochilus? spiralocostatus | Sp. nov | Valid | Gründel, Hostettler & Gfeller | Late Jurassic (Oxfordian) | St-Ursanne-Formation | Switzerland | Possibly a member of the family Ataphridae. |
| Coenaculum boucheti | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Coenaculum. |
| Cryptochorda altavesna | Sp. nov | Valid | Pacaud & Sautereau | Eocene (Lutetian) | | France | A member of the family Harpidae. |
| Cryptochorda cosediensis | Sp. nov | Valid | Pacaud & Sautereau | Eocene (Lutetian)) | | France | A member of the family Harpidae. |
| Cryptochorda neptis | Sp. nov | Valid | Pacaud & Sautereau | Eocene (Ypresian)) | | France | A member of the family Harpidae. |
| Currylimacina asperita | Sp. nov | Valid | Garvie in Garvie, Goedert & Janssen | | | United States | |
| Cypraecassis minirufa | Sp. nov | Valid | Landau et al. | Miocene | | Indonesia | A species of Cypraecassis. |
| Cyrillia michalidesi | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Cyrillia. |
| Daphnella groeneveldi | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Daphnella. |
| Donaldina sakmaraensis | Sp. nov | Valid | Mazaev | Permian (Sakmarian) | | Russia | |
| Ebala ornatissima | Sp. nov | Valid | Landau, Ceulemans & Van Dingenen | Miocene (Tortonian) | | France | A species of Ebala. |
| Emarginula rara | Sp. nov | Valid | Gründel, Hostettler & Gfeller | Late Jurassic (Oxfordian) | St-Ursanne-Formation | Switzerland | A species of Emarginula. |
| Enneopupa priabonica | Sp. nov | Valid | Harzhauser et al. | Late Eocene | | Spain | |
| Eoconus cambieni | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | |
| Eoconus vanhoutenae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | |
| Eofavartia dharmai | Sp. nov | Valid | Merle & Landau | Middle Miocene | | Indonesia | A member of the family Muricidae. |
| Eohispania | Gen. et sp. nov | Valid | Harzhauser et al. | Late Eocene | | Spain | Genus includes new species E. dominicii. |
| Eotrichophorus | Gen. et sp. nov | Valid | Bullis et al. | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A member of the family Cyclophoridae. Genus includes new species E. kachin. |
| Erato crassus | Sp. nov | Valid | Fehse | Miocene | | France | A species of Erato. |
| Erato fragilis | Sp. nov | Valid | Fehse | Miocene | | France | A species of Erato. |
| Erato pinguis | Sp. nov | Valid | Fehse | Miocene | | France | A species of Erato. |
| Erato princeps | Sp. nov | Valid | Fehse | Miocene | | France | A species of Erato. |
| Erato prokimakowiczi | Sp. nov | Valid | Fehse | Miocene | | France | A species of Erato. |
| Erato quasiplanulosa | Sp. nov | Valid | Fehse | Miocene | | France | A species of Erato. |
| Erato tenuipustulata | Sp. nov | Valid | Fehse | Miocene | | France | A species of Erato. |
| Eulimella redoniana | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Eulimella. |
| Eulimella semilaeve | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Eulimella. |
| Eusassia | Gen. et comb. nov | Valid | Craig & Tracey in Craig et al. | Eocene | | France | A member of the family Cymatiidae. The type species is "Triton (Lampusia)" chalmasi Vasseur (1882); genus also includes "Eutritonium (Sassia)" dubusi Cossmann & Pissarro (1905). |
| Euthema annae | Sp. nov | In press | Balashov | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A species of Euthema. |
| Euthema truncatellina | Sp. nov | Valid | Balashov, Perkovsky & Vasilenko | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A species of Euthema. |
| Euthriofusus postumus | Sp. nov | Valid | Landau & Mulder | Pliocene | | Spain | |
| Freboldia carinii | Sp. nov | Valid | Pieroni & Nützel | Middle Triassic | Esino Limestone | Italy | |
| Fusulculus hanseni | Nom. nov | Valid | Pacaud | Early Paleocene | | Denmark | A species of Fusulculus; a replacement name for Epalxis ? rosenkrantzi Hansen (2019). |
| Gosseletina microstriata | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | A member of the family Gosseletinidae. Originally described as a species of Gosseletina; Mazaev (2021) transferred it to the genus Nemaspira. |
| Haedropleura brebioni | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Haedropleura. |
| Haedropleura gallica | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Haedropleura. |
| Haedropleura ligeriana | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Haedropleura. |
| Headonia | Gen. et comb. nov | Valid | Harzhauser et al. | Late Eocene | Headon Hill Formation | France United Kingdom | The type species is "Planorbis" euomphalus Sowerby (1816) |
| Heliconoides hodgkinsoni | Sp. nov | Valid | Garvie in Garvie, Goedert & Janssen | | | United States | |
| Helvetataphrus | Gen. et comb. nov | Valid | Gründel, Hostettler & Gfeller | Late Jurassic (Oxfordian) | St-Ursanne-Formation | France Switzerland | A member of the family Ataphridae. The type species is "Turbo" subrugosus Buvignier (1852). |
| Heterogen praelongispira | Sp. nov | Valid | Matsuoka & Hirano | Pleistocene | Katata Formation | Japan | A species of Heterogen. |
| Heterosubulites longusapertura | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Incisilabium trochiformis | Sp. nov | Valid | Lozouet, Cahuzac & Charles | Eocene (Priabonian) | | France | A member of the family Modulidae. |
| Ividella tuberculata | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A member of the family Pyramidellidae. Originally described as a species of Ividella, but subsequently transferred to the genus Mulderia. |
| Katosira ? bicarinata | Sp. nov | Valid | Ferrari, Little & Atkinson | Early Jurassic (Toarcian) | Blea Wyke Sandstone Formation | United Kingdom | A member of the family Zygopleuridae. |
| Klavlia minuta | Sp. nov | Valid | Mazaev | Permian (Sakmarian) | | Russia | |
| Laminifera nannodes | Sp. nov | Valid | Harzhauser et al. | Late Eocene | | Spain | |
| Laxecostula | Gen. et comb. nov | Valid | Harzhauser et al. | Eocene (Lutetian) | Bouxwiller Formation | France | Genus includes "Helix" laxecostulata Sandberger (1871). |
| Leufroyia annegienae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Leufroyia. |
| Leufroyia hesseli | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Leufroyia. |
| Leufroyia ligeriana | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Leufroyia. |
| Leufroyia renauleauensis | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Leufroyia. |
| Leufroyia riccardoi | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Leufroyia. |
| Leufroyia seani | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Leufroyia. |
| Limacina parvabrazensis | Sp. nov | Valid | Garvie & Janssen in Garvie, Goedert & Janssen | | | United States | A species of Limacina. |
| Limacina pseudopygmaea | Sp. nov | Valid | Garvie & Janssen in Garvie, Goedert & Janssen | | | United States | A species of Limacina. |
| Limacina texanopsis | Sp. nov | Valid | Garvie in Garvie, Goedert & Janssen | | | United States | A species of Limacina. |
| Limacina yadongensis | Sp. nov | Valid | Li et al. | Early Eocene | Zhepure Formation | China | A species of Limacina. |
| Loriolotrema | Gen. et sp. nov | Valid | Gründel, Hostettler & Menkveld-Gfeller | Late Jurassic | | Switzerland | A member of the family Brachytrematidae. Genus includes new species L. liriola. |
| Lozouetina naonedosca | Sp. nov | Valid | Pacaud & Gómez | Eocene (Bartonian) | | France  Spain | A member of the family Ovulidae belonging to the subfamily Pediculariinae. |
| Macromphalina alinemulderae | Sp. nov | Valid | Landau & Mulder | Pliocene | | Spain | A species of Macromphalina. |
| Macropupina | Gen. et sp. nov | Valid | Bullis et al. | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A member of the family Pupinidae. Genus includes new species M. electricus. |
| Mangelia burgersae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Mangelia. |
| Margarites hayashii | Sp. nov | Valid | Kiel, Aguilar & Kase | Late Pliocene | Bata Formation | Philippines | A species of Margarites. |
| Megastomia pseudopolysarcula | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Megastomia. |
| Menestho bertieae | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Menestho. |
| Microsassia | Gen. et sp. nov | Valid | Craig & Tracey in Craig et al. | Eocene (Lutetian) | | France | A member of the family Cymatiidae. The type species is M. inconspicua Craig & Tracey. |
| Microtriton | Gen. et 2 sp. et comb. nov | Valid | Craig & Tracey in Craig et al. | Eocene | | France | A member of the family Cymatiidae. The type species is M. biplicoides Craig & Tracey; genus also includes new species M. dollfusi Craig & Tracey, as well as "Lampusia (Simpulum)" bourdoti Cossmann (1897). |
| Mitromorpha mulderi | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Mitromorpha. |
| Modulus benoisti | Sp. nov | Valid | Lozouet, Cahuzac & Charles | Miocene (Serravallian) | | France | A species of Modulus. |
| Moelleria jansseni | Sp. nov | Valid | Hoeksema, Rijken & Simons | Pleistocene | | France | A species of Moelleria. |
| Monoplex dissimilis | Sp. nov | Valid | Landau et al. | Miocene | | Indonesia | A species of Monoplex. |
| Monoplex gradatus | Sp. nov | Valid | Craig, Tracey & Gain in Craig et al. | Eocene | | France | A species of Monoplex. |
| Nassitriton | Gen. et sp. nov | Valid | Craig & Tracey in Craig et al. | Eocene | | France | A member of the family Cymatiidae. The type species is N. conicus Craig, Tracey & Le Renard; genus might also include "Lampusia (Sassia)" lennieri Cossmann & Pissarro (1901). |
| Naticopsis sokensis | Sp. nov | Valid | Mazaev | Permian (Sakmarian) | | Russia | |
| Nemdaella usensis | Sp. nov | Valid | Mazaev | Permian (Sakmarian) | | Russia | |
| Neniopsilla | Gen. et sp. nov | Valid | Harzhauser et al. | Late Eocene | | Spain | Genus includes new species N. amoena. |
| Neritopsis brasili | Sp. nov | Valid | Symonds, Gain & Le Renard | Eocene | | France | A species of Neritopsis. |
| Neritopsis toddi | Sp. nov | Valid | Symonds, Gain & Le Renard | Eocene | | France | A species of Neritopsis. |
| Niveria ledoni | Sp. nov | Valid | Fehse & Vicián | Late Miocene | | France | A species of Niveria. |
| Niveria miocarinata | Sp. nov | Valid | Fehse & Vicián | Late Miocene | | France | A species of Niveria. |
| Ocinebrina bertai | Sp. nov | Valid | Kovács | Middle Miocene | | Hungary | A species of Ocinebrina. |
| Odostomia fortistriata | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Odostomia. |
| Odostomia miopupa | Nom. nov | Valid | Landau et al. | | | France | A species of Odostomia; a replacement name for Odontostomia rissoides var. pupa Gougerot (1969). |
| Odostomia robustissima | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Odostomia. |
| Ovicarychium | Gen. et 2 sp. et comb. nov | Valid | Kadolsky | Eocene | | France Germany | A member of the family Ellobiidae belonging to the subfamily Carychiinae. The type species is O. ronlederi; genus also includes new species O.hennigeri, as well as O. bigeminatum (Deshayes, 1863), O. carbonarium (Wenz, 1932), O. interferens (Deshayes, 1863), O. polysarcum (Cossmann, 1914), O. quadridens(Andreae, 1884), O. remiense (Boissy, 1848) and O. sparnacense (Deshayes, 1863). |
| Oxfordina | Gen. et comb. nov | Valid | Gründel, Hostettler & Gfeller | Late Jurassic (Oxfordian) | St-Ursanne-Formation | Switzerland | A member of the family Eucyclidae. The type species is "Trochus" crassicosta Buvignier (1852). |
| Palaeostoa costellata | Sp. nov | Valid | Kadolsky | Early Eocene | | Germany | A member of the family Palaeostoidae. |
| Paleodiplommatina | Gen. et sp. nov | Disputed | Bullis et al. | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A member of the family Diplommatinidae. Genus includes new species P. spelomphalos. Considered to be a junior synonym of the genus Euthema by Balashov (2020). |
| Paracraticula? catalaunica | Sp. nov | Valid | Harzhauser et al. | Late Eocene | | Spain | |
| Parasassia | Gen. et comb. et 2 sp. nov | Valid | Craig & Tracey in Craig et al. | Eocene | | France | A member of the family Cymatiidae. The type species is "Triton" multigraniferum Deshayes (1835); genus also includes "Triton" bicinctum Deshayes (1835), "Triton" dumortieri Baudon (1853), "Lampusia (Simpulum)" polysarca Cossmann & Pissarro (1901), "Lampusia (Simpulum)" pustulifera Cossmann & Pissarro (1901) and "Murex" reticulosus Lamarck (1803), as well as new species P. globosa Craig & Tracey and P. polysarcoides Craig & Tracey. |
| Parthenina brebioni | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Parthenina chauvereauensis | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Parthenina clementiensis | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Parthenina lamellata | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Parthenina ligeriana | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Parthenina milleti | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Parthenina pouweri | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Parthenina redoniana | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Parthenina sceauxensis | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Parthenina tenuicostata | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Parthenina wesselinghi | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Parthenina. |
| Patella staceata | Sp. nov | Valid | Gründel, Hostettler & Gfeller | Late Jurassic (Oxfordian) | St-Ursanne-Formation | Switzerland | A species of Patella. |
| Perissocyclos | Gen. et sp. nov | Valid | Bullis et al. | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A member of the family Cyclophoridae. Genus includes new species P. kyrtostoma. |
| Peruvispira brasilensis | Sp. nov | In press | Simões et al. | Late Paleozoic | Taciba Formation | Brazil | |
| Planitriton | Gen. et comb. nov | Valid | Craig & Tracey in Craig et al. | Eocene | Calcaire Grossier d'Etrechy | France | A member of the family Cymatiidae. The type species is "Triton" planicostatum Deshayes (1835). |
| Platyzona gradata | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Pleurotomaria pogibshiensis | Sp. nov | Valid | Ferrari et al. | Early Jurassic (Hettangian) | Pogibshi Formation | United States ( Alaska) | |
| Pleurotomoides barnardi | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | |
| Pleurotomoides vanderdoncki | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | |
| Praealaerato venusta | Sp. nov | Valid | Fehse | Miocene | | France | A member of the family Eratoidae. |
| Profundimitra lacuiensis | Nom. nov | Valid | Nielsen & Ampuero | Early Miocene | | Chile | A species of Profundimitra; a replacement name for Mitra martini Philippi (1887). |
| Prososthenia krijgsmani | Sp. nov | Valid | Mandic, Harzhauser & Neubauer | Middle Miocene | | Bosnia and Herzegovina | |
| Prososthenia milosevici | Sp. nov | Valid | Neubauer et al. | Miocene | | Serbia | A member of the family Hydrobiidae belonging to the subfamily Pyrgulinae. |
| Prososthenia? naissensis | Sp. nov | Valid | Neubauer et al. | Miocene | | Serbia | A member of the family Hydrobiidae belonging to the subfamily Pyrgulinae. |
| Prososthenia rundici | Sp. nov | Valid | Neubauer et al. | Miocene | | Serbia | A member of the family Hydrobiidae belonging to the subfamily Pyrgulinae. |
| Protocharonia | Gen. et comb. nov | Valid | Craig & Tracey in Craig et al. | Eocene | | France | A member of the family Charoniidae. The type species is "Triton" formosum Deshayes (1865); genus also includes "Eutritonium (Sassia) gouetense" var. semitextum Cossmann (1919). |
| Protoplex | Gen. et sp. et comb. nov | Valid | Craig & Tracey in Craig et al. | Eocene | | France United Kingdom | A member of the family Cymatiidae. The type species is P. gervillei Craig & Tracey; genus also includes "Murex" nodularius Lamarck (1803), "Sassia" websteri Wrigley (1932) and "Sassia" biserialis Wrigley (1932). |
| Provanna azurini | Sp. nov | Valid | Kiel, Aguilar & Kase | Late Pliocene | Bata Formation | Philippines | A species of Provanna. |
| Pseudangaria | Gen. et comb. nov | Valid | Gründel, Hostettler & Gfeller | Late Jurassic (Oxfordian) | St-Ursanne-Formation | Switzerland | A member of the family Angariidae. The type species is "Delphinula" kobyi De Loriol in De Loriol & Koby (1895). |
| Pseudoneptunea constantinensis | Sp. nov | Valid | Gain & Belliard | Eocene | | France | |
| Pseudoneptunea prima | Sp. nov | Valid | Gain & Belliard | Paleocene (Thanetian) | | France | |
| Pseudoneptunea trinodularia | Sp. nov | Valid | Gain & Belliard | Eocene | | France | |
| Pseudoscilla breitenbergeri | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Pseudoscilla. |
| Pseudotectonica | Gen. et sp. nov | Valid | Harzhauser et al. | Late Eocene | | Spain | Genus includes new species P. pulchra. |
| Pyrgulina cancellatissima | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Pyrgulina. |
| Pyrgulina presselierensis | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Pyrgulina. |
| Raphitoma breitenbergeri | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Raphitoma. |
| Raphitoma dellabellaorum | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Raphitoma. |
| Raphitoma soniusae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Raphitoma. |
| Raphitoma vogeli | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Raphitoma. |
| Rimula lobilloensis | Sp. nov | Valid | Landau & Mulder | Pliocene | | Spain | A species of Rimula. |
| Rimulopsis torulosus | Sp. nov | Valid | Gründel, Hostettler & Gfeller | Late Jurassic (Oxfordian) | St-Ursanne-Formation | Switzerland | A member of the family Fissurellidae. |
| Rotatrigonostoma | Gen. et sp. et comb. nov | Valid | Landau, Breitenberger & Harzhauser | Miocene | | Austria Romania | A member of the family Cancellariidae. Genus includes new species R. reinholdkunzi, as well as "Pseudomalaxis" boettgeri Cossmann (1916). |
| Sassiella | Gen. et 11 sp. et comb. nov | Valid | Craig & Tracey in Craig et al. | Eocene | | France | A member of the family Cymatiidae. The type species is S. lacertina Craig & Tracey; genus also includes new species S. angulata Craig & Tracey, S. bacata Craig & Tracey, S. caputdraconis Craig & Tracey, S. crassilabrum Craig & Tracey, S. decussata Craig & Tracey, S. multivittata Craig & Tracey, S. puncticarinata Craig & Tracey, S. radulfivillensis Craig & Tracey, S. scalaris Craig & Tracey and S. vincta Craig & Tracey, as well as "Murex" colubrinus Lamarck (1803) and "Lampusia (Simpulum) polyzonalis" var. parameces Cossmann & Pissarro (1901). |
| Schilderina charlesi | Sp. nov | Valid | Dolin & Aguerre | Miocene | | France | A member of the family Cypraeidae. |
| Schilderina vaesseni | Sp. nov | Valid | Dolin & Aguerre | Miocene | | France | A member of the family Cypraeidae. |
| Scissurella nesbittae | Sp. nov | Valid | Geiger & Goedert | Eocene or Oligocene (latest Priabonian or earliest Rupelian) | Gries Ranch Formation | United States ( Washington) | A species of Scissurella. |
| Scutus mirus | Sp. nov | Valid | Gard | Late Oligocene to early Miocene | | New Zealand | A species of Scutus. |
| Seguenzia statiana | Sp. nov | Valid | Sosso, Bertolaso & Dell’Angelo | Miocene (Tortonian) | Marne di S. Agata Fossili Formation | Italy | A species of Seguenzia. |
| Selvovum | Gen. et comb. nov | Valid | Juárez-Ruiz, Matamales-Andreu & Kadolsky | Late Eocene | | Spain | A member of the family Vidaliellidae; a new genus for "Ampullaria" selvensis. |
| Semicypraea italorossii | Sp. nov | Valid | Checchi, Zamberlan & Alberti | Eocene (Ypresian-Lutetian) | | Italy | A member of the family Cypraeidae. |
| Semiricinula preturbinoides | Sp. nov | Valid | Landau et al. | Miocene (Langhian) | | Indonesia | A species of Semiricinula. |
| Skenea wesselinghi | Sp. nov | Valid | Hoeksema & Simons | Pliocene | | Belgium Netherlands | A species of Skenea. |
| Skeneopsoides | Gen. et sp. nov | Valid | Hoeksema, Rijken & Simons | Pliocene | | Netherlands | A member of the family Skeneidae. Genus includes new species S. dejongi. |
| Spiralinella pagoda | Sp. nov | Valid | Landau et al. | Miocene (Tortonian) | | France | A species of Spiralinella. |
| Spinatus | Gen. et 2 sp. et comb. nov | Valid | Dekkers et al. | Miocene | | Indonesia | A member of the family Strombidae. The type species is S. echinatus; genus also includes new species S. wonosariensis, as well as "Strombus" tjilonganensis Martin (1899). |
| Steenbergia wohlmuthorum | Sp. nov | Valid | Walther & Groh | Late Pleistocene | | Madeira | A member of the family Geomitridae. |
| Stegocoelia samaraensis | Sp. nov | Valid | Mazaev | Permian (Sakmarian) | | Russia | |
| Stephaniphera | Gen. et sp. nov | Valid | Schneider, Kollmann & Pickford | Late Cretaceous | Al-Khodh Formation | Oman | A member of Cerithioidea belonging to the family Hemisinidae. The type species is S. coronata. |
| Strebloceras kobayashii | Sp. nov | Valid | Haga | Middle Pleistocene | Toyohashi Formation | Japan | A member of the family Caecidae. |
| Streptacis? khaokhadensis | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Streptacis volgenesis | Sp. nov | Valid | Mazaev | Permian (Sakmarian) | | Russia | |
| Striactaenonina elegans | Sp. nov | Valid | Ferrari, Little & Atkinson | Early Jurassic (Toarcian) | Blea Wyke Sandstone Formation | United Kingdom | A member of Architectibranchia belonging to the family Tubiferidae. |
| Subtemenia | Gen. et comb. nov | Valid | Schneider, Kollmann & Pickford | Late Cretaceous | Al-Khodh Formation | Iran Oman | A member of the family Pseudomelaniidae. The type species is "Paryphostoma" morgani Douvillé (1904). |
| Siphocypraea daughenbaughi | Sp. nov | | Berschauer & Waller | | Tamiami Formation | United States ( Florida) | A member of the family Cypraeidae. |
| Subpterynotus feliciae | Sp. nov | | Petuch & Berschauer | | | United States ( Florida) | A species of Subpterynotus. |
| Subpterynotus gabbi | Sp. nov | | Petuch & Berschauer | | | United States ( Florida) | A species of Subpterynotus. |
| Teretia horroi | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene (Tortonian) | | France | A species of Teretia. |
| Trachydomia suwanneeae | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Trachyspira eleganta | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Triptychia catalanica | Sp. nov | Valid | Harzhauser et al. | Late Eocene | | Spain | |
| Triptychia tomerdingensis | Sp. nov | Valid | Kadolsky | Miocene (Aquitanian) | | Germany | A member of the family Filholiidae. |
| Trochomodulus stampinicus | Sp. nov | Valid | Lozouet, Cahuzac & Charles | Oligocene (Rupelian) | | France | A member of the family Modulidae. |
| Truncatellina dilatatus | Sp. nov | Valid | Yu | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | Originally described as a species of Truncatellina; Balashov (2021) transferred it to the genus Euthema. |
| Trypanocochlea lopburiensis | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Turbo histrioides | Sp. nov | Valid | Kase et al. | Miocene | | Japan | A species of Turbo. |
| Turbo izuensis | Sp. nov | Valid | Kase et al. | Miocene | | Japan | A species of Turbo. |
| Turricarychium | Gen. et sp. nov | Valid | Kadolsky | Early Eocene | | Germany | A member of the family Ellobiidae belonging to the subfamily Carychiinae. The type species is T. muelleri. |
| Turritelloidea stepheni | Sp. nov | Valid | Ferrari, Little & Atkinson | Early Jurassic (Toarcian) | Blea Wyke Sandstone Formation | United Kingdom | A member of the family Gordenellidae. |
| Umbilia darryli | Sp. nov | Valid | Hawke | Miocene | | Australia | A species of Umbilia. |
| Umbilia hallani | Sp. nov | Valid | Hawke | Miocene | | Australia | A species of Umbilia. |
| Vermetujanulus | Gen. et sp. nov | Valid | Walther & Groh | Late Pleistocene | | Madeira | A member of the family Gastrodontidae. Genus includes new species V. boessnecki. |
| Vetulonia philippinensis | Sp. nov | Valid | Kiel, Aguilar & Kase | Late Pliocene | Bata Formation | Philippines | A species of Vetulonia. |
| Vexillum pseudoschafferi | Sp. nov | Valid | Biskupič | Miocene (Serravallian) | Studienka Formation | Slovakia | A species of Vexillum. |
| Vexillum svagrovskyi | Sp. nov | Valid | Biskupič | Miocene (Serravallian) | Studienka Formation | Slovakia | A species of Vexillum. |
| Vicetia bizzottoi | Sp. nov | Valid | Dominici, Fornasiero & Giusberti | Eocene (Priabonian) | Possagno Marl Formation | Italy | A member of the family Cypraeidae belonging to the subfamily Gisortiinae. |
| Worthenia humiligrada | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Worthenia morovi | Sp. nov | Valid | Mazaev | Permian (Sakmarian) | | Russia | |
| Xenostoma | Gen. et sp. nov | Disputed | Bullis et al. | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | Genus includes new species X. lophopleura. Originally described as a member of the family Pupinidae; Balashov (2021) considered Xenostoma to be a junior synonym of the diplommatinid genus Euthema, and transferred X. lophopleura to the latter genus. |
| Yunnania inflata | Sp. nov | Valid | Ketwetsuriya et al. | Permian (Roadian) | Khao Khad Formation | Thailand | |
| Zuella | Gen. et sp. nov | Valid | Kadolsky | Early Eocene | | Germany | A member of the family Ellobiidae belonging to the subfamily Carychiinae. The type species is Z. venusta. |

### Research

* A study on the evolutionary history of pteropods, based on molecular data and revised fossil evidence, is published by Peijnenburg et al. (2020).

## Bivalves
### New taxa

| Name | Novelty | Status | Authors | Age | Type locality | Country | Notes |
| Adelfia | Gen. et comb. et sp. nov | Valid | Alvarez & Río | Eocene | La Meseta Formation Loreto Formation Submeseta Formation | Antarctica  Chile | A member of the family Veneridae. The type species is "Eumarcia" austrolissa Stilwell & Zinsmeister (1992); genus also includes "Venus" arenosa Ortmann (1899), as well as new species A. omega. |
| Aguileria romualdoensis | Sp. nov | In press | Rodrigues et al. | Early Cretaceous (Aptian) | Romualdo Formation | Brazil | A member of the family Bakevelliidae. |
| Amudariella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Uzbekistan | A member of Trigoniida belonging to the group Myophorelloidea. The type species is "Trigonia" amudariensis Arkhanguelsky (1916); genus also includes "Korobkovitrigonia" subamudariensis Saveliev (1958). |
| Araripenaia | Gen. et sp. nov | Valid | Da Silva et al. | Early Cretaceous | Crato Formation | Brazil | An unionid bivalve with possible hyriid affinities. Genus includes new species A. elliptica. |
| Araripevellia | Gen. et sp. nov | In press | Rodrigues et al. | Early Cretaceous (Aptian) | Romualdo Formation | Brazil | A member of the family Bakevelliidae. Genus includes new species A. musculosa. |
| Arca budoensis | Sp. nov | Valid | Amano in Amano & Kurita | Early Miocene | Asahi Formation | Japan | A species of Arca. |
| Archivesica pastori | Sp. nov | Valid | Kiel, Aguilar & Kase | Late Pliocene | Bata Formation | Philippines | A member of the family Vesicomyidae. |
| Astarte danningeri | Sp. nov | Valid | Mandic et al. | Early Miocene | | Austria | A species of Astarte. |
| Avichlamys hoferhauseri | Sp. nov | Valid | Szente | Early Triassic | Werfen Formation | Austria | |
| Bobkovaella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Russia | A member of Trigoniida belonging to the group Myophorelloidea. Genus includes "Trigonia" sydorenkoeremeievae Scheglova-Borodina (1960) and "Korobkovitrigonia" tobolica Pojarkova (1990). |
| Bogdanovaella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Turkmenistan  Uzbekistan | A member of Trigoniida belonging to the group Myophorelloidea. Genus includes "Korobkovitrigonia" conspecta Vinokurova (1970), "Trigonia" darwaseana Romanovsky (1890), "Trigonia" ferganensis Arkhanguelsky (1916), "Korobkovitrigonia" kugitangensis Burkova (1963), "Trigonia" rhombifera Romanovsky (1890) and "Korobkovitrigonia" tagamensis Belyakova (1970). |
| Cochisella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | United States ( Arizona Texas) | A member of Trigoniida belonging to the group Myophorelloidea. The type species is "Trigonia" guildi Stoyanow (1949); genus also includes "Trigonia" dumblei Stoyanow (1949), "Trigonia" gordoni Whitney (1952), "Trigonia" mearnsi Stoyanow (1949), "Trigonia" resoluta Stoyanow (1949), "Trigonia" saavedra Stoyanow (1949) and "Trigonia" taffi Cragin (1893). |
| Channelaxinus antipoloensis | Sp. nov | Valid | Kiel, Aguilar & Kase | Early Pleistocene | Bata Formation | Philippines | A member of the family Thyasiridae. |
| Conchocele majimai | Sp. nov | Valid | Kiel, Aguilar & Kase | Late Pliocene | Bata Formation | Philippines | A member of the family Thyasiridae. |
| Conchocele visayaensis | Sp. nov | Valid | Kiel, Aguilar & Kase | Early Pleistocene | Bata Formation | Philippines | A member of the family Thyasiridae. |
| Cratonaia | Gen. et sp. nov | Valid | Da Silva et al. | Early Cretaceous (Aptian) | Crato Formation | Brazil | A bivalve belonging to the order Unionida and to the group Silesunionoidea. Genus includes new species C. novaolindensis. |
| Cristaflabellum | Gen. et comb. nov | Valid | Hautmann et al. | Triassic | San Cassiano Formation | Bosnia and Herzegovina Italy | A member of the group Aviculopectinoidea. The type species is "Pecten" volaris Bittner (1902); genus also includes "Pecten" interstriatus Münster (1841). |
| Diplodonta oesia | Nom. nov | Valid | Pacaud | Eocene (Lutetian) | | France | A replacement name for Diplodonta profunda Deshayes (1857) |
| Dulcina liogliogensis | Sp. nov | Valid | Kiel, Aguilar & Kase | Late Pliocene | Bata Formation | Philippines | A member of the family Lucinidae. |
| Dulcina magoi | Sp. nov | Valid | Kiel, Aguilar & Kase | Late Pliocene | Bata Formation | Philippines | A member of the family Lucinidae. |
| Elliptiolucina fernandoi | Sp. nov | Valid | Kiel, Aguilar & Kase | Late Pliocene to early Pleistocene | Bata Formation | Philippines | A member of the family Lucinidae. |
| Eothyasira | Gen. et comb. nov | Valid | Karapunar et al. | Early Jurassic (Pliensbachian) | | Germany | Genus includes "Venus" antiqua Münster (1841). |
| Geloina amithoscutana | Sp. nov | Valid | Schneider, Kollmann & Pickford | Late Cretaceous | Al-Khodh Formation | Oman | A member of the family Cyrenidae. |
| Gibbolucina aremorica | Nom. nov | Valid | Pacaud | Eocene | | France | A member of the family Lucinidae; a replacement name for Lucina profunda Dufour (1881) |
| Globodiscus | Gen. et 2 sp. nov | Valid | Hautmann et al. | Triassic | | Indonesia Romania | A member of the group Aviculopectinoidea. Genus includes new species G. kiliani and G. vinzenti. |
| Gyrostrea bogdanovae | Sp. nov | Valid | Kosenko & Metelkin | Early Cretaceous (Hauterivian–Barremian) | Kugusem Formation | Kazakhstan | An oyster. |
| Illyricocongeria forcakovici | Sp. nov | Valid | Mandic, Harzhauser & Neubauer | Middle Miocene | | Bosnia and Herzegovina | |
| Lima allerdingensis | Sp. nov | Valid | Mandic et al. | Early Miocene | | Austria | A species of Lima. |
| Limopsis quenstedti | Nom. nov | Valid | Karapunar et al. | | | | A replacement name for Nucula aurita Quenstedt (1856). |
| Lucinoma canudai | Sp. nov | Valid | Kiel, Aguilar & Kase | Early Pleistocene | Bata Formation | Philippines | A member of the family Lucinidae. |
| Lucinoma kosatorea | Sp. nov | Valid | Kiel, Aguilar & Kase | Early Pleistocene | Bata Formation | Philippines | A member of the family Lucinidae. |
| Lucinoma tinagoensis | Sp. nov | Valid | Kiel, Aguilar & Kase | Early Pleistocene | Bata Formation | Philippines | A member of the family Lucinidae. |
| Lucinoma velosoi | Sp. nov | Valid | Kiel, Aguilar & Kase | Early Pleistocene | Bata Formation | Philippines | A member of the family Lucinidae. |
| Lutetigonia | Gen. et comb. nov | Valid | Cooper | Cretaceous | | France  Tunisia | A member of Trigoniida belonging to the group Myophorelloidea. The type species is "Trigonia" palmata Leymerie (1842); genus also includes "Trigonia" cherahilensis Mongin (1951). |
| Lyropecten terrysmithae | Sp. nov | Valid | Powell, Millard & Garcia | Miocene | Monterey Formation Santa Margarita Sandstone | United States ( California) | A scallop. |
| Macheromenilia | Gen. et comb. nov | Valid | Cooper | Cretaceous | | France | A member of Trigoniida belonging to the group Myophorelloidea. The type species is "Trigonia" constantii d'Orbigny (1844). |
| Malletia tsubetsuensis | Sp. nov | Valid | Matsubara in Matsubara et al. | Miocene (Aquitanian) | Tsubetsu Formation | Japan | A member of the family Malletiidae |
| Marciachlys | Gen. et comb. nov | Valid | Alvarez & Río | Eocene | Submeseta Formation | Antarctica | A member of the family Veneridae. The type species is "Eurhomalea" inflata Zinsmeister (1984). |
| Mezounio | Gen. et sp. nov | Valid | Zakharov in Zakharov et al. | Middle Jurassic (Bajocian) | | Russia | An unionid bivalve. Genus includes new species M. zverkovi. |
| Monginellopsis | Gen. et sp. nov | Valid | Da Silva et al. | Early Cretaceous | Crato Formation | Brazil | A bivalve with possible trigonioidid affinities. Genus includes new species M. bellaradiata. |
| Monopleura alesta | Sp. nov | Valid | Masse & Fenerci-Masse | Early Cretaceous (Barremian) | | France | A rudist bivalve. |
| Monopleura jurensis | Sp. nov | Valid | Masse & Fenerci-Masse | Early Cretaceous (Hauterivian) | | France | A rudist bivalve. |
| Muscatella | Gen. et sp. nov | Valid | Schneider, Kollmann & Pickford | Late Cretaceous | Al-Khodh Formation | Oman | A member of the family Cyrenidae. The type species is M. biszczukae. |
| Myonera inouei | Sp. nov | Valid | Amano in Amano & Kurita | Paleocene (Selandian) | Tomikawa Formation | Japan | A member of the family Cuspidariidae. |
| Myonia aparicioi | Sp. nov | Valid | Díaz Saravia & González | Carboniferous (Pennsylvanian) | Santa Elena Formation | Argentina | |
| Nanogyra brevisulcata | Sp. nov | Valid | Toscano & Lazo | Early Cretaceous | Neuquén Basin | Argentina | A bivalve belonging to the family Gryphaeidae. |
| Neoquadratotrigonia | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Belgium  France  United Kingdom | A member of Trigoniida belonging to the group Myophorelloidea. The type species is "Trigonia" quadrata Agassiz (1840); genus also includes "Trigonia daedalea" bracquegniensis Gillet (1920, raised to the rank of the species N. bracquegniensis), "Trigonia daedalea" var. confusa Lycett (1875, raised to the rank of the species N. confusa), "Trigonia" daedalea Parkinson (1811), "Trigonia" rudis Parkinson (1811) and "Trigonia" spectabilis Sowerby (1826). |
| Nicaniella schoberti | Sp. nov | Valid | Karapunar et al. | Early Jurassic (Pliensbachian) | | Germany | |
| Oesterheldia | Gen. et sp. nov | Valid | Pérez & Giachetti | Late Oligocene – early Miocene | | Argentina | A member of the family Carditidae. The type species is "Venericardia" cannada Ihering (1907); genus also includes "Cyclocardia" dalek Pérez & del Río (2017). |
| Palaeomutela australis | Sp. nov | Valid | Guerrini et al. | Permian | Rio do Rasto Formation | Brazil | A bivalve belonging to the group Actinodontida and the family Palaeomutelidae. Announced in 2019; the final version of the article naming it was published in 2020. |
| Paracuspidaria | Gen. et comb. nov | Valid | Karapunar et al. | Early Jurassic (Pliensbachian) | | Germany | Genus includes "Cypricardia" goldfussiana Kuhn (1935) and "Cypricardia" walteri Kuhn (1935). |
| Permophorus? yrigoyeni | Sp. nov | Valid | Díaz Saravia & González | Carboniferous (Pennsylvanian) | Santa Elena Formation | Argentina | |
| Pholadomya miyanoharaensis | Nom. nov | Valid | Matsubara | Cretaceous | | Japan | A replacement name for Pholadomya japonica Amano (1956). |
| Pratulum kurrawchipellu | Sp. nov | Valid | Rojas & Nielsen | Early Miocene | Ipún Beds | Chile | A species of Pratulum. |
| Pratulum terpoorteni | Sp. nov | Valid | Rojas & Nielsen | Early Miocene | Navidad Formation | Chile | A species of Pratulum. |
| Promytilus rochacamposi | Sp. nov | Valid | Díaz Saravia & González | Carboniferous (Pennsylvanian) | Santa Elena Formation | Argentina | |
| Protocardia broilii | Sp. nov | Valid | Yanin | Early Cretaceous (Berriasian) | | Crimean Peninsula | |
| Relogiincola | Gen. et sp. nov | Valid | Guerrini et al. | Permian | Rio do Rasto Formation | Brazil | A bivalve belonging to the group Edmondioidea and the family Pachydomidae. Genus includes new species R. delicata. Announced in 2019; the final version of the article naming it was published in 2020. |
| Retroceramus alliensis | Sp. nov | Valid | Zakharov in Zakharov et al. | Middle Jurassic (Bajocian) | | Russia | |
| Retroceramus (?) inopinatus | Sp. nov | Valid | Zakharov in Zakharov et al. | Middle Jurassic (Bajocian) | | Russia | |
| Rollieria franconica | Sp. nov | Valid | Karapunar et al. | Early Jurassic (Pliensbachian) | | Germany | |
| Rollieria goldfussi | Nom. nov | Valid | Karapunar et al. | | | | A replacement name for Nucula subovalis Goldfuss (1837). |
| Romanovskajaella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | | A member of Trigoniida belonging to the group Myophorelloidea. The type species is "Korobkovitrigonia" mediasiatica Belyakova (1970); genus also includes "Korobkovitrigonia" akkaptschigensis Belyakova (1970), "Korobkovitrigonia" bobkovae Belyakova (1970), "Korobkovitrigonia" gissarensis Belyakova (1970) and "Korobkovitrigonia" rugosa Belyakova (1970). |
| Romanovskiella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Uzbekistan | A member of Trigoniida belonging to the group Myophorelloidea. The type species is "Trigonia" romanovskii Arkhanguelsky (1916); genus also includes "Trigonia" aralensis Arkhangelsky (1912). |
| Saveligonia | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Russia  Turkmenistan | A member of Trigoniida belonging to the group Myophorelloidea. The type species is "Litschkovitrigonia" media Saveliev (1958); genus also includes "Litschkovitrigonia inguschensis" alta Prozorovskii (1961, raised to the rank of the species S. alta), "Trigonia" inguschensis Renngarten (1926), "Trigonia" subdaedalea Renngarten (1926) and "Litschkovitrigonia" tenuituberculata Saveliev (1958). |
| Shajia | Gen. et sp. nov | Valid | Rao et al. | Early Cretaceous (Aptian or Albian) | Langshan Formation | China  India | A rudist bivalve. Genus includes new species S. tibetica. |
| Terraia decarinata | Sp. nov | Valid | Guerrini et al. | Permian | Rio do Rasto Formation | Brazil | A bivalve belonging to the family Astartidae. Announced in 2019; the final version of the article naming it was published in 2020. |
| Trigonipraxis madjerensis | Sp. nov | Valid | Neubauer et al. | Miocene | | Serbia | A member of the family Dreissenidae belonging to the subfamily Congeriinae. |
| Vinokurovaella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | | A member of Trigoniida belonging to the group Myophorelloidea. The type species is "Korobkovitrigonia" grumosa Vinokurova (1970); genus also includes "Quadratotrigonia" turkmenica Vinokurova (1970). |

## Other mollusks
### New taxa

| Name | Novelty | Status | Authors | Age | Type locality | Country | Notes |
| Acanthochitona interglacialis | Sp. nov | Valid | Dell'Angelo et al. | Late Pleistocene | | Saudi Arabia | A chiton, a species of Acanthochitona. |
| Apoptopegma joyceae | Sp. nov | Valid | Smith, Brock & Paterson | Cambrian (Guzhangian) | Shannon Formation | Australia | A rostroconch. |
| Catalanispira | Gen. et sp. et comb. nov | Valid | Ebbestad, Kolata & Isakar | Ordovician (Darriwilian and Sandbian) | Kõrgekallas Platteville | Estonia United States ( Illinois) | A member of the family Onychochilidae. The type species is C. plattevillensis; genus also includes "Clisospira" reinwaldti Öpik (1930). |
| Craspedochiton fontlevensis | Sp. nov | Valid | Dell’Angelo et al. | Miocene (Burdigalian) | | France | A chiton, a species of Craspedochiton. |
| Craspedochiton lozoueti | Sp. nov | Valid | Dell’Angelo et al. | Oligocene (Rupelian) | | France | A chiton, a species of Craspedochiton. |
| Crassaplax | Gen. et sp. nov | Valid | Högström, Ebbestad & Suzuki | Ordovician (Katian) | Boda Limestone | Sweden | A member of Paleoloricata. The type species is C. collicola. |
| Lepidochitona chalossensis | Sp. nov | Valid | Dell’Angelo et al. | Oligocene (Rupelian) | | France | A chiton, a species of Lepidochitona. |
| Lepidochitona charlesi | Sp. nov | Valid | Dell’Angelo et al. | Oligocene (Rupelian) | | France | A chiton, a species of Lepidochitona. |
| Lepidochitona larratensis | Sp. nov | Valid | Dell’Angelo et al. | Oligocene (Rupelian) | | France | A chiton, a species of Lepidochitona. |
| Lepidochitona tarbelliana | Sp. nov | Valid | Dell’Angelo et al. | Oligocene (Rupelian) | | France | A chiton, a species of Lepidochitona. |
| Lepidochitona tessellata | Sp. nov | Valid | Dell’Angelo et al. | Oligocene (Rupelian) | | France | A chiton, a species of Lepidochitona. |
| Lepidochitona vancuycki | Sp. nov | Valid | Dell’Angelo et al. | Oligocene (Rupelian) | | France | A chiton, a species of Lepidochitona. |
| Lucilina aqabaensis | Sp. nov | Valid | Dell'Angelo et al. | Late Pleistocene | | Saudi Arabia | A chiton, a species of Lucilina. |
| Qaleruaqia | Gen. et sp. nov | Valid | Peel | Cambrian Stage 4 | Aftenstjernesø Formation | Greenland | A member of the family Mattheviidae. The type species is Q. sodermanorum. |
| Pseudoacanthochitona marsanensis | Sp. nov | Valid | Dell’Angelo et al. | Miocene (Burdigalian) | | France | A chiton. |
| Stenosemus radiatus | Sp. nov | Valid | Dell’Angelo et al. | Miocene (Burdigalian) | | France | A chiton. |
| Tonicella adunca | Sp. nov | Valid | Dell’Angelo et al. | Miocene (Aquitanian) | | France | A chiton, a species of Tonicella. |
| Tonicella nuda | Sp. nov | Valid | Dell’Angelo et al. | Oligocene (Rupelian) | | France | A chiton, a species of Tonicella. |

### Research

* New specimens of Pelagiella exigua with associated impressions of two clusters of chaetae, providing new information on the anatomy of this taxon, are described from the Cambrian Kinzers Formation (Pennsylvania, United States) by Thomas, Runnegar & Matt (2020), who infer the occurrence of a pair of chaeta-bearing appendages extending from the anterior body wall or foot of the animal (unique among living and extinct molluscs), and interpret Pelagiella as the earliest known stem gastropod.