# 2023 in paleomalacology

This list of fossil molluscs described in 2023 is a list of new taxa of fossil molluscs that were described during the year 2023, as well as other significant discoveries and events related to molluscan paleontology that occurred in 2023.

## Ammonites

| Name | Novelty | Status | Authors | Age | Type locality | Location | Notes |
| Acutimitoceras paracutum | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Prionoceratidae belonging to the subfamily Acutimitoceratinae. |
| Acutimitoceras ucatum | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Prionoceratidae belonging to the subfamily Acutimitoceratinae. |
| Ammonellipsites infirmus | Sp. nov | Valid | Korn in Zohara Malti et al. | Carboniferous (Tournaisian) | Hassi Sguilma Formation | Algeria | |
| Arpavoniceras | Gen. et sp. et comb. nov | | Frau & Fuhr | Early Cretaceous (Hauterivian) | | France  United Kingdom | A member of the family Neocomitidae. The type species is A. buloti; genus also includes "Shasticrioceras" anglicum Doyle (1963). |
| Asteroceras dommerguesi | Sp. nov | Valid | Zaitsev & Ippolitov | Early Jurassic (Sinemurian) | | Crimea | |
| Aulatornoceras beyrichi | Sp. nov | Valid | Söte & Becker | Devonian (Frasnian) | Büdesheim Formation | Germany | A member of the family Tornoceratidae. Announced in 2022; the final article version was published in 2023. |
| Australopseudothurmannia | Gen. et sp. nov | | Marin, Aguirre-Urreta & Rawson | Early Cretaceous (Hauterivian) | | Argentina | Genus includes new species A. flexuosa. |
| Becanites rowanensis | Sp. nov | Valid | Work & Mason | Carboniferous (Tournaisian) | Borden Formation | United States ( Kentucky) | |
| Bollandoceras antecedens | Sp. nov | Valid | Korn in Zohara Malti et al. | Carboniferous (Tournaisian) | Hassi Sguilma Formation | Algeria | |
| Buedesheimites | Gen. et sp. nov | Valid | Söte & Becker | Devonian (Frasnian) | Büdesheim Formation | Germany | A member of the family Tornoceratidae. Genus includes new species B. housei. Announced in 2022; the final article version was published in 2023. |
| Corbinites | Gen. et comb. nov | Valid | Poulton | Late Jurassic | | Canada | A member of the family Ataxioceratidae belonging to the subfamily Lithacoceratinae. The type species is "Titanites" occidentalis Frebold (1957). |
| Costiphylloceras limayense | Sp. nov | Valid | Joly, Parent & Garrido | Middle Jurassic (Aalenian) | Los Molles Formation | Argentina | A member of the family Phylloceratidae. |
| Crassotornoceras tenue | Sp. nov | Valid | Söte & Becker | Devonian (Frasnian) | Büdesheim Formation | Germany | A member of the family Tornoceratidae. Announced in 2022; the final article version was published in 2023. |
| Cryptomorphiceras | Gen. et comb. et 2 sp. nov | Valid | Marchesi, Balini & Jenks | Late Triassic (Carnian) | | United States ( Nevada) | A member of Trachyceratinae. The type species is C. compressum (Johnston, 1941); genus also includes new species C. crassum, and C. levicostatum. Announced in 2022; the final article version was published in 2023. |
| Djanaliparkinsonia egori | Sp. nov | Valid | Mitta | Middle Jurassic (Bajocian) | | Russia ( Karachay-Cherkessia) | A member of the family Stephanoceratidae. |
| Emileites christophi | Sp. nov | Valid | Dietze & Hostettler | Middle Jurassic | Passwang Formation | Switzerland | |
| Eocanites delicatus | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Prolecanitidae belonging to the subfamily Prolecanitinae. |
| Gattendorfia bella | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae. |
| Gattendorfia corpulenta | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae. |
| Gattendorfia immodica | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae. |
| Gattendorfia rhenana | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae. |
| Gattendorfia schmidti | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae. |
| Gattendorfia valdevoluta | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae. |
| Hammatocyclus rugosus | Sp. nov | Valid | Korn in Zohara Malti et al. | Carboniferous (Tournaisian) | Hassi Sguilma Formation | Algeria | |
| Hasselbachia erronea | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae belonging to the subfamily Gattendorfiinae. |
| Idahocolumbites phatthalungensis | Sp. nov. | Valid | Thongterm & Shigeta in Thongterm et al. | Triassic (Spathian) | Chaiburi formation | Thailand | A member of Ceratitida belonging to the family Columbitidae. |
| Imitoceras initium | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Prionoceratidae belonging to the subfamily Imitoceratinae. |
| Kazakhstania kana | Sp. nov | Valid | Korn & Weyer | Carboniferous | | Morocco | A member of the family Gattendorfiidae belonging to the subfamily Gattendorfiinae. |
| Knemiceras lanceolatum | Sp. nov | | Latil & Jaillard | Early Cretaceous | | Tunisia | |
| Knemiceras multicostatum | Sp. nov | | Latil & Jaillard | Early Cretaceous | | Tunisia | |
| Knemiceras sagetae | Sp. nov | | Latil & Jaillard | Early Cretaceous | | Tunisia | |
| Knemiceras tunisiense | Sp. nov | | Latil & Jaillard | Early Cretaceous | | Tunisia | |
| Kornia acia | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Prionoceratidae belonging to the subfamily Prionoceratinae. |
| Kornia fibula | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Prionoceratidae belonging to the subfamily Prionoceratinae. |
| Lazariniceras heterostylia | Sp. nov | | Bert et al. | Early Cretaceous (Barremian) | | France | |
| Lazariniceras lhaumeti | Sp. nov | | Bert et al. | Early Cretaceous (Barremian) | | France | |
| Linguatornoceras acutilobatum | Sp. nov | Valid | Söte & Becker | Devonian (Frasnian) | Büdesheim Formation | Germany | A member of the family Tornoceratidae. Announced in 2022; the final article version was published in 2023. |
| Linguatornoceras sandense | Sp. nov | Valid | Söte & Becker | Devonian (Frasnian) | Büdesheim Formation | Germany | A member of the family Tornoceratidae. Announced in 2022; the final article version was published in 2023. |
| Lobosphinctes dzhissaensis | Sp. nov | Valid | Mitta in Mitta & Sherstyukov | Middle Jurassic | | Russia | A member of the family Perisphinctidae. |
| Merocanites parvevolutus | Sp. nov | Valid | Korn in Zohara Malti et al. | Carboniferous (Tournaisian) | Hassi Sguilma Formation | Algeria | |
| Metengonoceras foleyi | Sp. nov | Valid | May & Lucas | Late Cretaceous (Cenomanian) | Dakota Sandstone | United States ( New Mexico) | A member of the family Engonoceratidae. |
| Mimimitoceras mina | Sp. nov | Valid | Korn & Weyer | Carboniferous | | Morocco | A member of the family Prionoceratidae belonging to the subfamily Prionoceratinae. |
| Mimimitoceras perditum | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Prionoceratidae belonging to the subfamily Prionoceratinae. |
| Mosirites | Gen. et 2 sp. nov | | Shigeta, Nishimura & Izukura | Cretaceous (Albian to Cenomanian) | | Japan | A heteromorph ammonoid, possibly derived from Anisoceras. Genus includes M. serpentiformis and M. mirabilis. |
| Muensteroceras rectilineum | Sp. nov | Valid | Korn in Zohara Malti et al. | Carboniferous (Tournaisian) | Hassi Sguilma Formation | Algeria | |
| Muensteroceras triplettense | Sp. nov | Valid | Work & Mason | Carboniferous (Tournaisian) | Borden Formation | United States ( Kentucky) | |
| Nomismocanites | Gen. et sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Prolecanitidae belonging to the subfamily Prolecanitinae. The type species is N. raritas. |
| Paprothites beckeri | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae belonging to the subfamily Pseudarietitinae. |
| Paprothites kullmanni | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae belonging to the subfamily Pseudarietitinae. |
| Paraemericiceras | Gen. et sp. nov | | Marin, Aguirre-Urreta & Rawson | Early Cretaceous (Hauterivian) | Agrio Formation | Argentina | Genus includes new species P. argentinense. |
| Paraspiticeras bituberculatum | Sp. nov | | Marin, Aguirre-Urreta & Rawson | Early Cretaceous (Hauterivian) | Agrio Formation | Argentina | |
| Parengonoceras chottensis | Sp. nov | | Latil & Jaillard | Early Cretaceous | | Tunisia | |
| Planisphinctes pirkli | Sp. nov | Valid | Mitta in Mitta & Sherstyukov | Middle Jurassic | | Russia | A member of the family Perisphinctidae. |
| Plesechioceras rochai | Sp. nov | Valid | Vitón et al. | Early Jurassic (Sinemurian) | | Portugal | |
| Proplacenticeras alabushevi | Nom. nov | | Latil, Murphy & Rodda | Cretaceous (Albian-Cenomanian) | | Russia | The fossil material was originally described as Rapidoplacenticeras sutherlandbrowni (McLearn, 1972) by Alabushev (1988). |
| Pseudhimalayites carchelejensis | Sp. nov | Valid | Parent et al. | Late Jurassic (Tithonian) | | Spain | A member of the family Aspidoceratidae. |
| Roberticeras | Gen. et comb. nov | Valid | Latil, Murphy & Rodda | Cretaceous | | France  Madagascar  Switzerland  Tunisia  United Kingdom | A member of the family Desmoceratidae. The type species is "Ammonites" dupinianus d'Orbigny (1841); genus also includes other species which were formerly assigned to the genus Beudanticeras. |
| Rodingites | Gen. et comb. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae belonging to the subfamily Pseudarietitinae. The type species is "Pseudarietites" planissimus Vöhringer (1960); genus also includes "Pseudarietites" carinatus Vöhringer (1960). |
| Rotopericyclus saourensis | Sp. nov | Valid | Korn in Zohara Malti et al. | Carboniferous (Tournaisian) | Hassi Sguilma Formation | Algeria | |
| Serpenticyclus | Gen. et comb. nov | Valid | Becker | Carboniferous (Tournaisian, possibly also Viséan) | | Algeria  Morocco  Russia? | A member of the family Pericyclidae. The type species is "Helicocyclus" fuscus Korn et al. (2003); genus also includes "H." formosus Korn et al. (2010), "H." inornatus Korn et al. (2010), "H." laxaris Korn et al. (2010) and possibly "H." involutus Kusina in Shimankiy & Kusina (1977) and "H." aberratus Kusina and Konovalova (2004). |
| Stockumites hofensis | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | | Germany | A member of the family Prionoceratidae belonging to the subfamily Acutimitoceratinae. |
| Stockumites marocensis | Sp. nov | Valid | Korn & Weyer | Carboniferous | | Morocco | A member of the family Prionoceratidae belonging to the subfamily Acutimitoceratinae. |
| Stockumites nonaginta | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | | Germany | A member of the family Prionoceratidae belonging to the subfamily Acutimitoceratinae. |
| Stockumites parallelus | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Stockum Limestone | Germany | A member of the family Prionoceratidae belonging to the subfamily Acutimitoceratinae. |
| Stockumites voehringeri | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Prionoceratidae belonging to the subfamily Acutimitoceratinae. |
| Tanabeceras nakagawaense | Sp. nov | | Shigeta, Sakai & Fujita | Late Cretaceous (Cenomanian) | | Japan | A member of the family Tetragonitidae. |
| Tectocyclus | Gen. et sp. et comb. nov | Valid | Becker | Carboniferous (Viséan) | | Morocco  United Kingdom | A member of the family Pericyclidae. The type species is T. herbigi; genus also includes "Helicocyclus" divergens Riley (1996). |
| Tetragonites nanus | Sp. nov | | Shigeta | Late Cretaceous (Coniacian to Campanian) | | Japan | A member of the family Tetragonitidae. |
| Tornoceras incisum | Sp. nov | Valid | Söte & Becker | Devonian (Frasnian) | Büdesheim Formation | Germany | A member of the family Tornoceratidae. Announced in 2022; the final article version was published in 2023. |
| Tornoceras ventrovaricatum | Sp. nov | Valid | Söte & Becker | Devonian (Frasnian) | Büdesheim Formation | Germany | A member of the family Tornoceratidae. Announced in 2022; the final article version was published in 2023. |
| Ulyanovskiceras | Gen. et comb. nov | Valid | Delanoy & Baudouin | Early Cretaceous (Aptian) | | Russia | A member of the family Ancyloceratidae. The type species is "Audouliceras" vyrystaykense Stenshin, Shumilkin & Uspensky (2014); genus also includes "Audouliceras" brusyankense Stenshin, Shumilkin & Uspensky (2014) and "Audouliceras" mordovense Stenshin, Shumilkin & Uspensky (2014). |
| Virgonisites | Gen. et sp. nov | Valid | Delanoy & Baudouin | Early Cretaceous (Barremian) | | France | A member of the family Ancyloceratidae. The type species is V. sippae. |
| Vutacuracrioceras | Gen. et comb. nov | | Marin, Aguirre-Urreta & Rawson | Early Cretaceous (Hauterivian) | | Argentina | A new genus for "Paraspiticeras" groeberi Aguirre-Urreta (1993). |
| Weyerella lenis | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae belonging to the subfamily Gattendorfiinae. |
| Zadelsdorfia oblita | Sp. nov | Valid | Korn & Weyer | Carboniferous (Tournaisian) | Hangenberg Limestone | Germany | A member of the family Gattendorfiidae belonging to the subfamily Gattendorfiinae. |
| Zadelsdorfia zana | Sp. nov | Valid | Korn & Weyer | Carboniferous | | Morocco | A member of the family Gattendorfiidae belonging to the subfamily Gattendorfiinae. |

### Ammonite research

* A study on the swimming capabilities of ammonites, aiming to determine hydrodynamic costs and advantages provided by different conch geometries, is published by Ritterbush & Hebdon (2023).
* A study on the mechanics and fluid dynamics of ammonite swimming is published by De Blasio (2023).
* Revision of the Middle Triassic ammonite assemblage from the Samobor and Žumberak Mountains (Croatia) is published by Vidaković et al. (2023), who consider "Protrachyceras" dorae Salopek (1912) to be the only unambiguously valid species with a holotype from the Gregurić Breg locality, and transfer this species to the genus Eoprotrachyceras.
* Revision of the early Kimmeridgian ammonites from the planula Biohorizon of the Wohlgeschichtete Kalk Formation (Germany) is published by Jantschke & Schweigert (2023).
* Revision of acanthohoplitid taxa from the Aptian strata from Dagestan (Russia) is published by Frau (2023), who considers Protacanthoplites abichi to be a synonym of Acanthohoplites aschiltaensis, and retains A. aschiltaensis as the senior valid name.
* Evidence from the Albian fossil material from the Clansayes locality (France), interpreted as indicative of the presence of sexual dimorphism in Mariella bergeri, as well as indicating that upper Albian Mariella, lower Cenomanian Mariella and lower Cenomanian Hypoturrilites share the same peristome morphology, is presented by Jattiot et al. (2023).
* A specimen of Prionocyclus germari found in association with an aptychus referred to the genus Praestriaptychus is described from the Turonian strata near Úpohlavy (Czech Republic) by Košťák et al. (2023).
* A specimen of Mammites nodosoides, preserved with bite traces interpreted as most likely resulting from a lethal attack of a mosasaur directed at the apertural part of the ammonite with the head and arm crown, is described from the Turonian Bílá Hora Formation (Czech Republic) by Mazuch et al. (2023).
* A study on the evolution of the peculiar morphology of Pravitoceras sigmoidale is published by Misaki, Okamoto & Maeda (2023).
* Shigeta & Maeda (2023) describe new fossil material of ammonites from the Maastrichtian Krasnoyarka Formation (Sakhalin, Russia), including fossils of Zelandites varuna, Gaudryceras seymouriense, Pachydiscus subcompressus and Anagaudryceras mikobokense, and interpret the presence of these species as indicative of the influx of immigrant ammonite species into the Northwest Pacific region during late Maastrichtian, which might have been associated with cooling after the greenhouse Middle Maastrichtian Event.

## Other cephalopods

| Name | Novelty | Status | Authors | Age | Type locality | Location | Notes |
| Aphelaeceras validum | Sp. nov | Valid | Korn in Zohara Malti et al. | Carboniferous (Tournaisian) | Hassi Sguilma Formation | Algeria | |
| Cenoceras polonicum | Sp. nov | | Jain et al. | Jurassic | | Poland | |
| Cenoceras rumelangense | Sp. nov | | Weis & Schweigert in Weis, Schweigert & Wittische | Middle Jurassic | | Germany  Luxembourg | |
| Conchorhynchus tabellulis | Sp. nov | Valid | Martinez | Eocene | | France | |
| Ellesmeroceras humahuacaensis | Sp. nov | Valid | Cichowolski et al. | Ordovician (Tremadocian) | Santa Rosita Formation | Argentina | |
| Endoceras novamagnum | Nom. nov | Valid | Greenfield | Late Ordovician | Saxby locality | Estonia | A replacement name for Endoceras magnum Stumbur (1956). |
| Endoceras secundepressum | Nom. nov | Valid | Greenfield | Middle Ordovician | Jigunsan Formation | South Korea | A replacement name for Endoceras depressum Yun (2011). |
| Endolobus rota | Sp. nov | Valid | Korn & Klug | Carboniferous (Viséan) | Zrigat Formation | Morocco | |
| Ephippioceras pygops | Sp. nov | Valid | Korn & Klug | Carboniferous (Viséan) | Zrigat Formation | Morocco | A member of the family Ephippioceratidae. |
| Epidomatoceras ebbighausenorum | Sp. nov | Valid | Korn & Klug | Carboniferous (Viséan) | Hamou-Rhanem Formation | Morocco | A member of the family Grypoceratidae. |
| Foveroceras | Gen. et sp. nov | Valid | Leonova & Shchedukhin | Permian (Asselian-Sakmarian) | | Russia ( Bashkortostan) | A member of Nautilida belonging to the family Permoceratidae. The type species is F. magnum. |
| Germanonautilus warthi | Sp. nov | Valid | Schweigert | Early Jurassic (Pliensbachian) | Numismalismergel Formation | Germany | |
| Linteroceras | Nom. nov | Valid | Mironenko | Carboniferous | | Russia | A replacement name for Linter Shimansky (1968). |
| Liroceras karaouii | Sp. nov | Valid | Korn & Klug | Carboniferous (Viséan) | Mougoui Ayoun Formation | Morocco | |
| Liroceras vermis | Sp. nov | Valid | Korn & Klug | Carboniferous (Viséan) | Hamou-Rhanem Formation | Morocco | |
| Micronautilus | Gen. et 2 sp. nov | Valid | Branger | Middle Jurassic (Bathonian) | | France | A member of the family Paracenoceratidae. The type species is M. evolutus; genus also includes M. minoti. |
| Nautilaphractus | Nom. nov | Valid | Ceccolini & Cianferoni | Carboniferous | | Russia | A replacement name for Aphractus Shimansky (1967). |
| Omorphoceras | Gen. et sp. nov | Valid | Leonova & Shchedukhin | Permian (Asselian-Sakmarian) | | Russia ( Bashkortostan) | A member of the family Grypoceratidae. The type species is O. igori. |
| Shikhanonautilus compressus | Sp. nov | Valid | Shchedukhin | Permian (Asselian-Sakmarian) | | Russia ( Bashkortostan) | A member of the family Liroceratidae. |
| Sichuanobelus luxiensis | Sp. nov | | Ma et al. | Late Triassic (Carnian) | Xiaowa Formation | China | A member of Belemnitida belonging to the family Sinobelemnitidae. |
| Solenochilus lucynae | Sp. nov | Valid | Korn & Klug | Carboniferous (Viséan) | Mougoui Ayoun Formation | Morocco | |
| Solenochilus pohlei | Sp. nov | Valid | Korn & Klug | Carboniferous (Viséan) | Mougoui Ayoun Formation | Morocco | |
| Stenopoceras (Leptodomatoceras) bashkiricum | Sp. nov | Valid | Leonova & Shchedukhin | Permian (Asselian-Sakmarian) | | Russia ( Bashkortostan) | A member of the family Grypoceratidae. |
| Temnocheilus aubrechtovae | Sp. nov | Valid | Korn & Klug | Carboniferous (Viséan) | Mougoui Ayoun Formation | Morocco | A member of the family Trigonoceratidae. |
| Temnocheilus imazighenorum | Sp. nov | Valid | Korn & Klug | Carboniferous (Viséan) | Zrigat Formation | Morocco | A member of the family Trigonoceratidae. |
| Trocholites chaloupkai | Sp. nov | Valid | Aubrechtová, Turek & Manda | Ordovician (Katian) | Upper Zahořany Formation | Czech Republic | |
| Uralharuspex | Nom. nov | Valid | Ceccolini & Cianferoni | Carboniferous | | Russia | A replacement name for  Haruspex Shimansky (1968). |
| Vampyrofugiens | Gen. et sp. nov | Valid | Rowe et al. | Middle Jurassic (Callovian) | La Voulte-sur-Rhône lagerstätte | France | A member of Vampyromorpha belonging to the group Loligosepiina and the family Geopeltidae. The type species is V. atramentum. |
| Vestinautilus kesslerae | Sp. nov | Valid | Korn & Klug | Carboniferous (Viséan) | Zrigat Formation | Morocco | A member of the family Trigonoceratidae. |

### Other cephalopod research

* A study on the phylogenetic relationships of belemnites is published by Stevens et al. (2023).
* Dzyuba et al. (2023) report the discovery of the fossil material of Arcobelus cf. krimholzi from the Jurassic (Toarcian–Aalenian) strata from the Kuoika kimberlite field (northeastern Siberian Platform, Olenek Uplift), and interpret putative Late Jurassic or Early Cretaceous belemnites from the studied area as possibly of Bajocian–Bathonian age.
* Evidence from clumped and stable isotopes and trace element data for three specimens from the Valanginian of southern Tibet and Madagascar, interpreted as indicating that Acroteuthis acrei and Duvalia sp. occupied shallower and warmer waters than Hibolithes jaculoides and that the latter belemnite was a fast swimmer that undertook vertical migration in the water column, is presented by Wang et al. (2023).
* Dernov (2023) reports the preservation of color patterns on conchs of nautiloid cephalopods from the Carboniferous (Moscovian) Kamenskaya Formation (Luhansk Oblast), interpreted as indicative of the presence of disruptive coloration.
* Wilmsen (2023) redescribes the Coniacian nautilid "Nautilus" sinuatoplicatus and transfers it to the genus Anglonautilus, filling a gap in the fossil record of this genus which was previously unknown from the late Cenomanian to early Campanian.
* A study aiming to determine the metabolic rates of ammonites and nautiloid cephalopods living at the end of the Cretaceous is published by Tajika et al. (2023), who find that the nautiloid Eutrephoceras had a lower metabolic rate than co-occurring ammonites, and argue that the lower metabolic rate in nautiloids might have been an advantage during the Cretaceous–Paleogene extinction event.
* Klug et al. (2023) report evidence of preservation of axial nerve cords in specimens of Jurassic cephalopods from France and Germany.
* Syllipsimopodi bideni, originally described as a member of the clade Vampyropoda, is reinterpreted as a probable junior synonym of Gordoniconus beargulchensis and unlikely to be a vampyropod by Klug et al. (2023); in a subsequent study Whalen & Landman (2023) support the interpretation of S. bideni as distinct from G. beargulchensis, but hint that further analyses might be needed to confirm the hypothesis that it is a vampyropod.
* Rogov et al. (2023) report the discovery of jaws of decabrachian coleoids from the Toarcian deposits of the Vilyui River basin (Sakha, Russia), representing the first finding of coleoid jaws in the Lower Jurassic strata in Siberia reported to date.
* Tanabe & Misaki (2023) describe new coleoid fossil material from the Upper Cretaceous Yezo Group (Japan), including a large upper jaw of an indeterminate member of Oegopsida and two lower jaws possibly belonging to members of the species Longibelus matsumotoi, and interpret the anatomy of the studied lower jaws as supporting the interpretation of Longibelus as a relative of Decapodiformes.
* An assemblage of coleoid cephalopods, including the latest record of Belosaepia blainvillei, is described from the Eocene (Priabonian) Mandrykivka Beds (Ukraine) by Dernov & Demianov (2023).
* Mironenko (2023) describes phosphatized jaws of cephalopods (mostly coleoids, but also one nautilid specimen) from the Upper Jurassic, Lower and Upper Cretaceous localities in Russia, including jaws likely belonging to large-bodied coleoids.

## Bivalves

| Name | Novelty | Status | Authors | Age | Type locality | Location | Notes |
| Acharax frenademezi | Sp. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of the family Solemyidae. |
| Alena | Gen. et sp. nov | | Polechová, Zicha & Rak | Ordovician (Sandbian) | Letná Formation | Czech Republic | A member of Pteriomorphia, possibly belonging to the group Cyrtodontida. The type species is A. pustulosa. The generic name is shared with Alena Navas (1916). |
| Allemanella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Argentina  Chile  Peru | A member of Trigoniida belonging to the family Rutitrigoniidae and the subfamily Syrotrigoniinae. The type species is "Quoiecchia" sigeli Leanza & Garate Zubillaga (1987); genus also includes "Buchotrigonia" biroi Pérez & Reyes (1986), "Trigonia" boiti Lissón (1930), "Buchotrigonia" chilensis Pérez & Reyes (1986) and "Syrotrigonia" obesa Pérez & Reyes (1997). |
| Bakevellia (Bakevellia) preromangica | Sp. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of the family Bakevelliidae. |
| Bathyisognomon | Gen. et sp. nov | Valid | Hickman | Eocene | Keasey Formation | United States ( Oregon) | A member of the family Isognomonidae. The type species is B. smithwickensis. |
| Delectopecten keaseyorum | Sp. nov | Valid | Hickman | Paleogene | Keasey Formation | United States ( Oregon) | A species of Delectopecten. |
| Delectopecten kieli | Sp. nov | Valid | Hickman | Paleogene | Keasey Formation | United States ( Oregon) | A species of Delectopecten. |
| Earlpackardia methowensis | Sp. nov | Valid | Halligan | Early Cretaceous (Albian) | | United States ( Washington) | A member of Trigoniida belonging to the family Rutitrigoniidae. |
| Edmondia hautmanni | Sp. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of the family Edmondiidae. |
| Etayosernella | Gen. et comb. et sp. nov | Valid | Cooper | Early Cretaceous | | Colombia | A member of Trigoniida belonging to the family Rutitrigoniidae and the subfamily Syrotrigoniinae. The type species is "Trigonia (Laevitrigonia)" scheibei Dietrich (1938); genus also includes new species E. noetlingi. |
| Etheripecten stuflesseri | Sp. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of Pectinida belonging to the family Heteropectinidae. |
| Gardenapecten | Gen. et comb. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of Pectinida belonging to the superfamily Aviculopectinoidea and the family Asoellidae. The type species is "Pecten (Aviculopecten)" trinkeri Stache (1878); genus also includes "Pecten (Aviculopecten)" comelicanus Stache (1878). |
| Glycymeris (Glycymeris) radiolyrata exaggerata | Ssp. nov | Valid | Moerdijk & van Nieulande | Pliocene | | Belgium  United Kingdom | A member of the family Glycymerididae. |
| Incagonia | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Peru | A member of Trigoniida belonging to the family Rutitrigoniidae and the subfamily Syrotrigoniinae. The type species is "Trigonia" mathewsi Richards (1947); genus also includes "Trigonia" flexicostata Fritzsche (1924), "Trigonia" forti Lissón (1930), "Trigonia" gerthi Lissón (1930), "Trigonia" inca Fritzsche (1924), "Trigonia" lorentii Dana (1849) and "Trigonia" paradisensis Lissón (1907). |
| Ionesimactra | Nom. nov | Valid | Signorelli | | | | A member of the family Mactridae; a replacement name for Caspimactra Ionesi. The type species is "Mactra" caspia Eichwald. |
| Isorropodon humptulipsense | Sp. nov | Valid | Kiel, Amano & Goedert | Eocene | Humptulips Formation | United States ( Washington) | A member of the family Vesicomyidae. |
| Ladinomya | Gen. et sp. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of the superfamily Trigonioidea, the type genus of the new family Ladinomyidae. The type species is L. fosteri. |
| Leguminaia hedenborgi | Sp. nov | Valid | Schneider & Linse | Pliocene–Pleistocene boundary | Kritika Formation | Greece | A member of the family Unionidae belonging to the subfamily Gonideinae. |
| Limopsis squiresi | Sp. nov | Valid | Hickman | Paleogene | Keasey Formation | United States ( Oregon) | A species of Limopsis. |
| Lovaralucina | Gen. et sp. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of the family Lucinidae. The type species is L. covidi. |
| Lucina dickersoni | Nom. nov | Valid | Pacaud et al. | Paleocene | | United States ( California) | A species of Lucina; a replacement name for Phacoides quadrata Dickerson (1914). |
| "Lucina" hungarica | Nom. nov | Valid | Pacaud et al. | Triassic | | Hungary | A replacement name for Lucina quadrata Kutassy (1933). |
| Lusitanigonia | Gen. et comb. nov | Valid | Cooper | Late Jurassic | | Portugal | A member of Trigoniida belonging to the family Rutitrigoniidae and the subfamily Syrotrigoniinae. The type species is "Trigonia" freixialensis Choffat (1885); genus also includes "Trigonia" kobyi Choffat (1885). |
| Macomopsis onubensis | Sp. nov | Valid | Brunetti & Della Bella | Pliocene | | Spain | A member of the family Tellinidae. |
| Macomopsis saccoi | Sp. nov | Valid | Brunetti & Della Bella | Pliocene (Piacenzian) | | Italy | A member of the family Tellinidae. |
| Matheronia carinata | Sp. nov | | Masse, Fenerci-Masse & Bucur | Early Cretaceous (Barremian-Aptian) | | Romania | A rudist bivalve belonging to the family Requieniidae. |
| Matheronia dacica | Sp. nov | | Masse, Fenerci-Masse & Bucur | Early Cretaceous (Barremian) | | Romania | A rudist bivalve belonging to the family Requieniidae. |
| Matheronia nerae | Sp. nov | | Masse, Fenerci-Masse & Bucur | Early Cretaceous (Barremian-Aptian) | | Romania | A rudist bivalve belonging to the family Requieniidae. |
| Matheronia silvaeregis | Sp. nov | | Masse, Fenerci-Masse & Bucur | Early Cretaceous (Aptian) | | Romania | A rudist bivalve belonging to the family Requieniidae. |
| Meleagrinella golberti | Sp. nov | Valid | Lutikov & Arp | Early Jurassic (Toarcian) | | Canada  Germany  Russia  United Kingdom | A member of the family Oxytomidae. Published online in 2023, but the issue date is listed as December 2022. |
| Meleagrinella prima | Sp. nov | Valid | Lutikov in Lutikov & Arp | Early Jurassic (Toarcian) | | Russia | A member of the family Oxytomidae. Published online in 2023, but the issue date is listed as December 2022. |
| Miltha (sensu lato) romaniae | Sp. nov | Valid | Kiel, Sami & Taviani | Miocene | | Italy | A member of the family Lucinidae. |
| Moerella etrusca | Sp. nov | Valid | Brunetti & Della Bella | Pliocene | | Italy | A member of the family Tellinidae. |
| Moerella hispanica | Sp. nov | Valid | Brunetti & Della Bella | Pliocene | | Spain | A member of the family Tellinidae. |
| Nuculoma douvillei | Sp. nov | Valid | Ayoub-Hannaa, Fürsich & Abdelhady | Middle Jurassic (Bathonian to Callovian) | Kehailia Formation | Egypt | A member of the family Nuculidae. |
| Nuculoma sinaiensis | Sp. nov | Valid | Ayoub-Hannaa, Fürsich & Abdelhady | Jurassic (Toarcian to lower Kimmeridgian) | Bir Maghara Formation | Egypt | A member of the family Nuculidae. |
| Pachygervillia | Gen. et sp. et comb. nov | Valid | Posenato & Crippa | Early Jurassic (Sinemurian–Toarcian) | Rotzo Formation | Italy | A member of Ostreida belonging to the family Plicatostylidae. The type species is P. anguillaensis; genus also includes "Perna" taramellii Boehm (1884). |
| Pachytraga carpathica | Sp. nov | | Masse, Fenerci-Masse & Bucur | Early Cretaceous (Barremian) | | Romania | A rudist bivalve belonging to the family Caprinidae. |
| Pachytraga gracilis | Sp. nov | | Masse, Frau & Fenerci-Masse | Early Cretaceous (Barremian) | | France | A rudist bivalve belonging to the family Caprinidae. |
| Palaeolima badiotica | Sp. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of the family Limidae. |
| Palaeoneilo aegyptiaca | Sp. nov | Valid | Ayoub-Hannaa, Fürsich & Abdelhady | Jurassic (Bajocian to Bathonian) | Kehailia Formation | Egypt | A member of Nuculanida belonging the family Cucullellidae. |
| Parvitrigonia | Gen. et sp. nov | Valid | Halligan | Early Cretaceous (Albian) | | United States ( Washington) | A member of Trigoniida belonging to the family Rutitrigoniidae. The type species is P. cooperi. |
| Pinna pacata | Sp. nov | Valid | Shilekhin, Mazaev & Biakov | Permian | | Russia | A species of Pinna. |
| Pleurophopsis thieli | Sp. nov | Valid | Kiel, Amano & Goedert | Oligocene | Makah Formation | United States ( Washington) | A member of the family Vesicomyidae. |
| Pliocardia? guthrieorum | Sp. nov | Valid | Kiel, Amano & Goedert | Oligocene | Lincoln Creek Formation | United States ( Washington) | Possibly a species of Pliocardia. |
| Promytilus merlai | Sp. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of the family Mytilidae. |
| Propeamussium (Parvamussium) mistensis | Sp. nov | Valid | Hickman | Paleogene | Keasey Formation | United States ( Oregon) | A species of Propeamussium. |
| Prospondylus shakhtauensis | Sp. nov | Valid | Biakov in Biakov & Mazaev | Permian | | Russia | A member of Pectinida belonging to the family Prospondylidae. |
| Pseudomiltha horcsarriu | Sp. nov | Valid | Pacaud et al. | Eocene (Bartonian) | | France | A member of the family Lucinidae. |
| Sisonia ultimoi | Sp. nov | Valid | Kiel, Sami & Taviani | Miocene (Langhian) | | Italy | A bivalve of uncertain affinities. |
| Squiresica plana | Sp. nov | Valid | Kiel, Amano & Goedert | Oligocene | Lincoln Creek Formation | United States ( Washington) | A member of the family Vesicomyidae. |
| Squiresica yooni | Sp. nov | Valid | Kiel, Amano & Goedert | Miocene | Duho Formation | South Korea | A member of the family Vesicomyidae. |
| Streblopteria gracilicosta | Sp. nov | Valid | Biakov | Permian | | Russia | A member of Pectinida belonging to the family Streblochondriidae. |
| Streblopteria parenensis | Sp. nov | Valid | Biakov | Permian | | Russia | A member of Pectinida belonging to the family Streblochondriidae. |
| Tambanella? stetteneckensis | Sp. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of the family Bakevelliidae. |
| Thiadensia | Gen. et comb. nov | | Mitchell | Late Cretaceous (Maastrichtian) | | Cuba | A rudist bivalve belonging to the subfamily Radiolitidae. The type species is "Bournonia" planasi Thiadens (1936). |
| Valenciella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Egypt  Lebanon  Spain | A member of Trigoniida belonging to the family Rutitrigoniidae and the subfamily Syrotrigoniinae. The type species is "Trigonia" picteti Coquand (1863); genus also includes "Trigonia" analoga Douvillé (1916), "Trigonia" depauperata Douvillé (1916), "Trigonia" higazyi Abbass (1962), "Trigonia" loutfyi Abbass (1962), "Trigonia" magharensis Abbass (1962) and "Trigonia" undulatocostata Blanckenhorn (1890). |
| Vermuntia | Gen. et comb. nov | | Mitchell | Late Cretaceous | | Jamaica | A rudist bivalve belonging to the subfamily Radiolitidae. The type species is "Radiolites" macroplicatus Whitfield (1897); genus also includes "Branislavia" stellaplicatus Mitchell & Ramsook (2009). |
| Volsellina carinata | Sp. nov | Valid | Prinoth & Posenato | Permian (Changhsingian) | Bellerophon Formation | Italy | A member of the family Mytilidae. |
| Yuexiconcha | Gen. et sp. nov | Valid | Zhang, Niu & Johnston in Niu et al. | Ordovician | Dongchong Formation | China | A member of Protobranchia, possibly belonging to the family Nuculidae. The type species is Y. duplicata. |

### Bivalve research

* Description of shell microstructure and muscle attachment scars from the inner surface on the shell in specimens of Fordilla troyensis from the Cambrian Aftenstjernesø Formation (Greenland) is published by Peel (2023).
* A study on the fossil record of bivalves is published by Zhou et al. (2023), who report that bivalves did not undergo and increase in taxonomic, morphological and functional diversity until the Ordovician, and did not undergo a burst of functional diversity relative to taxonomic diversity even during their Ordovician diversification.
* A study on the diversification dynamics of bivalves and brachiopods throughout their evolutionary histories is published by Guo et al. (2023), who interpret their findings as indicating that the switch from brachiopods to bivalves as major seabed organisms was unlikely to be caused by competitive exclusion of brachiopods by bivalves, but rather was likely caused by loss of brachiopod diversity in the Permian–Triassic extinction event and by bivalve diversification in the Cretaceous and Cenozoic that wasn't matched by brachiopods.
* A study on changes of taxonomic and functional diversity of bivalves during the Triassic-Jurassic transition is published by Abdelhady et al. (2023), who consider the sea-level fall causing the destruction of shallower marine habitats to be the primary cause of bivalve extinction in the studied time interval.
* Description of a new Cenomanian rudist assemblage from the Gattar Member of the Zebbag Formation (Tunisia), and study on the relationships between the new assemblage and other Cenomanian rudist assemblages from North Africa and the Levant region, is published by Philip, Negra & Bachari (2023).
* Özer & Săsăran (2023) reexamine the holotype and paratypes of Lattenbergites hermi, and interpret it as a junior synonym of the radiolitid species Joufia milovanovici.
* Evidence from fossils from the Pecínov Member of the Peruc–Korycany Formation and from the Bílá Hora Formation (Czech Republic), indicative of changes of the composition of the bivalve assemblages resulting from the Cenomanian-Turonian boundary event, is presented by Kunstmüllerová & Košťák (2023).

## Gastropods

| Name | Novelty | Status | Authors | Age | Type locality | Location | Notes |
| Agathotoma estherae | Sp. nov | Valid | Landau, Harzhauser & Giannuzzi-Savelli | Pliocene | | Spain | A species of Agathotoma. |
| Akburunella laminaris | Sp. nov | Valid | Guzhov | Miocene | | Russia | Published online in 2023, but the issue date is listed as December 2022. |
| Akburunella nefanda archaica | Ssp. nov | Valid | Guzhov | Miocene | | Russia | Published online in 2023, but the issue date is listed as December 2022. |
| Akburunella sinuosa | Sp. nov | Valid | Guzhov | Miocene | | Russia | Published online in 2023, but the issue date is listed as December 2022. |
| Akburunella spinosa | Sp. nov | Valid | Guzhov | Miocene | | Russia | Published online in 2023, but the issue date is listed as December 2022. |
| Aliculastrum suratensis | Sp. nov | | Banerjee & Halder | Eocene | Cambay Shale | India | A species of Aliculastrum. |
| Altadema hausmannae | Sp. nov | Valid | Nützel & Karapunar | Early Triassic | Werfen Formation | Italy | A member of the family Goniasmatidae. |
| Alvania praetermissa | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene | | France | A species of Alvania. |
| Ammotectonica | Gen. et sp. et comb. nov | Valid | Harzhauser & Landau | Miocene and Pliocene | | Czech Republic  Hungary  Italy | A member of the family Architectonicidae. The type species is A. gregorovae; genus also includes "Solarium" emiliae Semper (1861), "Solarium" deshayesii Michelotti (1847) and "Solarium" soproniense Strausz (1960). |
| Andonia fosseensis | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene | | France | |
| Aspella tusciae | Sp. nov | Valid | Forli, Cresti & Pagli | Pliocene | | Italy | A species of Aspella. |
| Athleta (Volutospina) baili | Sp. nov | Valid | Pacaud & Ledon | Eocene (Bartonian) | | France | A species of Athleta. |
| Attiliosa emilyae | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Attiliosa. |
| Attiliosa septaspinosa | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Attiliosa. |
| Attiliosa subgretae | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Attiliosa. |
| Bela obesoiberica | Sp. nov | Valid | Landau, Harzhauser & Giannuzzi-Savelli | Pliocene | | Spain | A species of Bela. |
| Bela olivoidea | Sp. nov | Valid | Landau, Harzhauser & Giannuzzi-Savelli | Pliocene | | Spain | A species of Bela. |
| Bernaya kaylinae | Sp. nov | Valid | Squires & Groves | Eocene | Llajas Formation | United States ( California) | A species of Bernaya. |
| Bittium miradouroense | Sp. nov | Valid | Sacchetti, Landau & Ávila | Pliocene | | Portugal ( Azores) | A species of Bittium. |
| Bizetiella attiliosaformis | Sp. nov | Valid | Lozouet | Miocene | | France | A species of Bizetiella. |
| Bolma redoniana | Nom. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene | | France | A species of Bolma; a replacement name for Turbo trochleatus Millet. |
| Brachystomia succineiformis | Sp. nov | Valid | Guzhov | Miocene | | Russia | A species of Brachystomia. Published online in 2023, but the issue date is listed as December 2022. |
| Brookesena romandiola | Sp. nov | Valid | Tabanelli et al. | Pliocene | | Italy | A species of Brookesena. |
| Caecum roederi | Sp. nov | Valid | Raines, Powell & LaFollette | Miocene | | United States ( California) | A species of Caecum. |
| Calagrassor mathiasi | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A species of Calagrassor. |
| Calliostoma nandori | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A species of Calliostoma. |
| Calotrophon vaporosus | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Calotrophon. |
| Carychium nashuaense | Sp. nov | Valid | Jochum, Lee & Portell in Jochum et al. | Early Pleistocene | Nashua Formation | United States ( Florida) | A species of Carychium. |
| Cerion (Strophiops) palacioi | Sp. nov | Valid | Suárez | Pliocene-Pleistocene | Río Maya Formation | Cuba | A species of Cerion. |
| Cerithiella bisulcata | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene | | France | A species of Cerithiella. |
| Chauvetia brunettii | Sp. nov | Valid | Landau & Micali | Pliocene | | Italy  Spain | A species of Chauvetia. |
| Chauvetia fenestrata | Sp. nov | Valid | Landau & Micali | Pliocene (Piacenzian) | | Spain | A species of Chauvetia. |
| Chauvetia fortiornata | Sp. nov | Valid | Landau & Micali | Pliocene (Piacenzian) | | Spain | A species of Chauvetia. |
| Chauvetia hoffmani | Sp. nov | Valid | Landau & Micali | Pliocene (Piacenzian) | | Spain | A species of Chauvetia. |
| Chauvetia janseni | Sp. nov | Valid | Landau & Micali | Pliocene (Piacenzian) | | Spain | A species of Chauvetia. |
| Chauvetia obesa | Sp. nov | Valid | Landau & Micali | Pliocene (Piacenzian) | | Spain | A species of Chauvetia. |
| Chauvetia oliveri | Sp. nov | Valid | Landau & Micali | Pliocene (Piacenzian) | | Spain | A species of Chauvetia. |
| Chauvetia pseudopelorcei | Sp. nov | Valid | Landau & Micali | Pliocene (Piacenzian) | | Spain | A species of Chauvetia. |
| Chauvetia sinuosa | Sp. nov | Valid | Landau & Micali | Pliocene (Piacenzian) | | Spain | A species of Chauvetia. |
| Chauvetia solida | Sp. nov | Valid | Landau & Micali | Pliocene (Piacenzian) | | Spain | A species of Chauvetia. |
| Chauvetia spinosa | Sp. nov | Valid | Landau & Micali | Pliocene (Piacenzian) | | Spain | A species of Chauvetia. |
| Chesathais pungoensis | Sp. nov | Valid | Petuch & Berschauer | Miocene | Pungo River Formation | United States ( North Carolina) | |
| Chicoreus marcominii | Sp. nov | Valid | Lozouet | Miocene | | France | A species of Chicoreus. |
| Chicoreus sacyi | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Chicoreus. |
| Cingulina eamesi | Sp. nov | | Banerjee & Halder | Eocene | Cambay Shale | India | A species of Cingulina. |
| Cirsotrema kokayi | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A species of Cirsotrema. |
| Clanculus s. l. gulyasi | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A member of the family Trochidae. |
| Clavatula s. l. barnabasi | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A member of the family Clavatulidae. |
| Clavatula s. l. istvani | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A member of the family Clavatulidae. |
| "Clavatula" pettkoi | Sp. nov | Valid | Biskupič | Miocene | Studienka Formation | Slovakia | A member of the family Clavatulidae. |
| Conomurex indica | Sp. nov | Valid | Bose, Das & Saha | Miocene | Dwarka Basin | India | A species of Conomurex. |
| Conotomaria dovilleae | Sp. nov | Valid | Chaix & Grenier | Late Cretaceous (Campanian) | | France | A member of the family Pleurotomariidae. |
| Conotomaria pilonae | Sp. nov | Valid | Chaix & Grenier | Late Cretaceous (Campanian) | | France | A member of the family Pleurotomariidae. |
| Cornirostra anistratenkorum umbilicaris | Ssp. nov | Valid | Guzhov | Miocene | | Russia | Published online in 2023, but the issue date is listed as December 2022. |
| Cossmannina australis | Sp. nov | | Ferrari | Early Jurassic (Pliensbachian) | Lepá Formation | Argentina | A member of Acteonoidea belonging to the family Tubiferidae. |
| Costoanachis haurzhauseri | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene | | France | A species of Costoanachis. |
| Costoanachis malaquiasi | Sp. nov | Valid | Landau, Harzhauser & Monsecour | Pliocene (Piacenzian) | | Spain | A species of Costoanachis. |
| Costosyrnola taptiensis | Sp. nov | | Banerjee & Halder | Eocene | Cambay Shale | India | A species of Costosyrnola. |
| Cylichna (Cylichna) ypresiana | Sp. nov | | Banerjee & Halder | Eocene | Cambay Shale | India | A species of Cylichna. |
| Cylindrobullina caquelensis | Sp. nov | | Ferrari | Early Jurassic (Pliensbachian) | Lepá Formation | Argentina | A member of Acteonoidea belonging to the family Cylindrobullinidae. |
| Cymia (sensu lato) praecaerulea | Sp. nov | Valid | Lozouet | Oligocene | | France | A member of the family Muricidae. |
| Cymia (sensu lato) subcaerulea | Sp. nov | Valid | Lozouet | Oligocene | | France | A member of the family Muricidae. |
| Cypraedia misrensis | Nom. nov | Valid | Pacaud | Eocene (Bartonian) | | Egypt | A member of the family Ovulidae; a replacement name for Cypraea (Cypraedia) arabica Cuvillier (1935). |
| Dentimargo barnai | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A species of Dentimargo. |
| Dilatilabrum mahalonobisi | Sp. nov | Valid | Bose, Das & Saha | Miocene | Dwarka Basin | India | |
| Echinophoria statioliteralis | Sp. nov | | Darragh | | | Australia | A species of Echinophoria. |
| Ecphora (Powhatan) grulkei | Sp. nov | Valid | Petuch & Berschauer | | | United States | A species of Ecphora. |
| Ecphora roxaneae dalli | Ssp. nov | Valid | Petuch & Berschauer | | Goose Creek Limestone | United States ( South Carolina) | |
| Edrozeba | Gen. et 4 sp. et comb. nov | Valid | Guzhov | Miocene | | Russia | A member of the family Hydrobiidae. The type species is E. caeca; genus also includes new species E. angulata, E. minuta and E. striata, as well as "Hydrobia" enikalensis Kolesnikov (1935). Published online in 2023, but the issue date is listed as December 2022. |
| Ellobium kerwaense | Sp. nov | Valid | Harzhauser, Pacaud & Landau | Oligocene (Chattian) | Mány Formation | Hungary | A species of Ellobium. |
| Eocypraea judithsmithae | Sp. nov | Valid | Groves & Squires | Eocene | Llajas Formation | United States ( California) | A member of the family Eocypraeidae. |
| Eoellobium | Gen. et comb. nov | Valid | Harzhauser, Pacaud & Landau | Eocene (Bartonian) | | France | A member of the family Ellobiidae. The type species is "Auricula" heberti Vasseur (1881); genus also includes "Melampus" britannus Vasseur (1882) and "Auricula" simplex Cossmann (1895). |
| Eopterodonta | Nom. nov | Valid | Pacaud | Late Cretaceous | | France | A member of the family Tylostomatidae; a replacement name for Pterodonta d'Orbigny (1843). |
| Erato mayeri | Sp. nov | Valid | Sacchetti, Landau & Ávila | Pliocene | | Portugal ( Azores) | A species of Erato. |
| Eriptycha delpeyi | Sp. nov | Valid | Chaix in Chaix & Plicot | Late Cretaceous (Santonian) | | France | A member of the family Ringiculidae. |
| Eriptycha ? royi | Sp. nov | Valid | Chaix in Chaix & Plicot | Late Cretaceous (Santonian) | | France | A member of the family Ringiculidae. |
| Euspira? louiemarincovichi | Sp. nov | | Powell & Dineen | Pleistocene (Gelasian) | Gubik Formation | United States ( Alaska) | Possibly a species of Euspira. |
| Falsipyrgula ? coronata | Sp. nov | Valid | Neubauer & Wesselingh | Pleistocene (Gelasian) | Kolankaya Formation | Turkey | A member of the family Hydrobiidae. |
| Favartia faviai | Sp. nov | Valid | Lozouet | Miocene | | France | A species of Favartia. |
| Galeodea fuscirivularis | Sp. nov | | Darragh | | | Australia | A species of Galeodea. |
| Galeodea goudeyi | Sp. nov | | Darragh | | | Australia | A species of Galeodea. |
| Gibbula kralli | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A species of Gibbula. |
| Glabrocingulum (Stenozone) heminodosus | Sp. nov | | Pinilla & Taboada | Permian | Pampa de Tepuel Formation | Argentina | A member of the family Eotomariidae. |
| Globecphora mardieae | Sp. nov | Valid | Petuch & Berschauer | | | United States | |
| Globiconcha vizcainoi | Sp. nov | Valid | Chaix in Chaix & Plicot | Late Cretaceous (Santonian) | | France | A member of the family Acteonidae. |
| Globulocerithium | Gen. et nom. nov | Valid | Pacaud | Paleogene | | Belgium  France  Germany  Hungary  Italy  Poland  Ukraine | A member of the family Cerithiidae. The type species is "Cerithium" globulosus Deshayes (1833); genus also includes "Cerithium" coezi Boussac (1911), "Cerithium" dallagonis Oppenheim (1894), "Cerithium" felix Deshayes (1864), "Cerithium" filifer Deshayes (1833), "Cerithium" filigrana von Koenen (1891), "Cerithium" guilielmi de Raincourt (1877), "Cerithium" intradentatum Deshayes (1864), "Cerithium" meneghinii Michelotti (1861), "Potamides" montense Briart & Cornet (1873), "Cerithium" petrafixense Cossmann & Lambert (1884), "Cerithium" piriforme Defrance (1817), "Cerithium" semicostatum Deshayes (1833), "Cerithium" tenuistriatum Melleville (1843), "Cerithium" tournissanense Doncieux (1908), "Cerithium" tumidum Braun in Walchner (1851), "Cerithium" vandenheckei Bellardi (1852), "Pyrazus" vignyensis Bouniol (1981) and Globulocerithium nautagarona (a replacement name for Cerithium coloniae Leymerie, 1878). |
| Graecoanatolica alcicekorum | Sp. nov | Valid | Neubauer & Wesselingh | Pleistocene (Gelasian) | Kolankaya Formation | Turkey | A species of Graecoanatolica. |
| Hartmutix | Gen. et comb. nov | Valid | Neubauer & Harzhauser | Eocene | | France | Possibly a member of the family Sphincterochilidae. The type species is "Helix" edwardsi Deshayes (1863). |
| Harzhauseria | Gen. et sp. nov | Valid | Neubauer & Wesselingh | Pleistocene (Gelasian) | Kolankaya Formation | Turkey | A member of the family Hydrobiidae. The type species is H. schizopleura. |
| Hastula wilmulderae | Sp. nov | Valid | Landau & Harzhauser | Pliocene (Piacenzian) | | Spain | A species of Hastula. |
| Heliacus globosus | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria | A species of Heliacus. |
| Helix kadolskyi | Nom. nov | Valid | Neubauer & Harzhauser | Miocene | | Bulgaria | A species of Helix; a replacement name for Helix toulai Kojumdgieva (1969) |
| Hemithersitea kanerus | Sp. nov | Valid | Bose, Das & Saha | Miocene | Dwarka Basin | India | |
| Hemithersitea nadharus | Sp. nov | Valid | Bose, Das & Saha | Miocene | Dwarka Basin | India | |
| Hydrobia neofrauenfeldi | Sp. nov | Valid | Guzhov | Miocene | | Russia | A species of Hydrobia. Published online in 2023, but the issue date is listed as December 2022. |
| Inella bentae | Sp. nov | Valid | Landau, Bakker & Marques da Silva | Pliocene | Estepona Basin | Spain | A species of Inella. |
| Iraklimelania minutissima | Sp. nov | Valid | Neubauer & Wesselingh | Pleistocene (Gelasian) | Kolankaya Formation | Turkey | A member of the family Hydrobiidae. |
| Iraklimelania submediocarinata | Sp. nov | Valid | Neubauer & Wesselingh | Pleistocene (Gelasian) | Kolankaya Formation | Turkey | A member of the family Hydrobiidae. |
| Islamiella | Gen. et 2 sp. nov | Valid | Guzhov | Miocene | | Russia ( Adygea) | A member of the family Hydrobiidae. Genus includes I. miocenica and I. maeotica. |
| Kantoria | Gen. et comb. et sp. nov | Valid | Landau & Harzhauser | Miocene and Pliocene | | Austria  Italy  Spain | A member of the family Pseudomelatomidae. The type species is "Pleurotoma" coquandi Bellardi (1847); genus also includes new species K. castoris, as well as "Pleurotoma" lamarckii Michelotti (1847), "Knefastia" sinuslata Vera-Peláez (2002) and "Comitas" catherinae Vera-Peláez (2022). |
| Laschmaspira lirata | Sp. nov | Valid | Nützel & Karapunar | Late Triassic (Carnian) | Hallstatt Limestone | Austria | A member of the family Goniasmatidae. |
| Lagunaspira | Gen. et sp. nov | | Pinilla & Taboada | Permian | Pampa de Tepuel Formation | Argentina | A member of the family Eotomariidae. The type species is L. labrocostellata. |
| Leucotina costata | Sp. nov | Valid | Guzhov | Miocene | | Russia ( Adygea) | A species of Leucotina |
| Leucotina excussa | Sp. nov | Valid | Guzhov | Miocene | | Russia ( Adygea) | A species of Leucotina |
| Leucotina ovata | Sp. nov | Valid | Guzhov | Miocene | | Russia ( Adygea) | A species of Leucotina |
| Leucotina ovatoides | Sp. nov | Valid | Guzhov | Miocene | | Russia ( Adygea) | A species of Leucotina |
| Mangelia pseudoceddaensis | Sp. nov | Valid | Landau, Harzhauser & Giannuzzi-Savelli | Pliocene | | Spain | A species of Mangelia. |
| Mcleanarene | Gen. et nom. nov | Valid | Pacaud | Late Cretaceous (Campanian) | | Spain | A member of the family Areneidae. The type species is M. taluniya (a replacement name for Arene mcleani Kiel & Bandel, 2002). |
| Megastomia canaliculata | Sp. nov | | Banerjee & Halder | Eocene | Cambay Shale | India | A species of Megastomia. |
| Megastomia carinata | Sp. nov | | Banerjee & Halder | Eocene | Cambay Shale | India | A species of Megastomia. |
| Mitrella avilai | Sp. nov | Valid | Landau, Harzhauser & Monsecour | Pliocene (Piacenzian) | | Spain | A species of Mitrella. |
| Mitrella pagodiformis | Sp. nov | Valid | Landau, Harzhauser & Monsecour | Pliocene (Piacenzian) | | Spain | A species of Mitrella. |
| Mitrella soveri | Sp. nov | Valid | Kovács & Vicián | Miocene | | Hungary | A species of Mitrella. |
| Mitrella velerinensis | Sp. nov | Valid | Landau, Harzhauser & Monsecour | Pliocene (Piacenzian) | | Spain | A species of Mitrella. |
| Monteiroconus strauszi | Sp. nov | Valid | Kovács & Vicián | Miocene | Lajta Limestone Formation | Hungary | A member of the family Conidae. |
| Morula (sensu lato) duplex | Sp. nov | Valid | Lozouet | Oligocene | | France | A member of the family Muricidae. |
| Nipteraxis deformatus | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria | |
| Nucella demouthae | Sp. nov | Valid | Powell, Roth & Garcia | Miocene | Wilson Grove Formation | United States ( California) | A species of Nucella. |
| Ocenebra pseudoexcoelata | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Ocenebra. |
| Ocenebra tarusatensis | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Ocenebra. |
| Ocinebrina deaki | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A species of Ocinebrina. |
| Odostomia caucasica | Sp. nov | Valid | Guzhov | Miocene | | Russia | A species of Odostomia. Published online in 2023, but the issue date is listed as December 2022. |
| Odostomia concavata | Sp. nov | | Banerjee & Halder | Eocene | Cambay Shale | India | A species of Odostomia. |
| Ophieulima ligeriana | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene | | France | A species of Ophieulima. |
| Ormastralium erazmusi | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A member of the family Turbinidae. |
| Orthonychia yutaroi | Sp. nov | Valid | Ebbestad in Nützel et al. | Ordovician (Katian) | Boda Limestone | Sweden | A member of the family Orthonychiidae. |
| Oxymeris transleithana | Sp. nov | Valid | Harzhauser & Landau | Miocene | Lajta Formation | Austria  Hungary | A species of Oxymeris. |
| Pachycrommium gourguesi | Sp. nov | Valid | Pacaud et al. | Eocene (Bartonian) | | France | A member of the family Ampullinidae. |
| Palaeoglandina turolensis | Sp. nov | Valid | Albesa & Neubauer | Miocene (Tortonian) and Pliocene (Zanclean) | Teruel Basin | Spain | A member of the family Spiraxidae belonging to the subfamily Euglandininae. |
| Palazzia omalogyroides | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene | | France | A species of Palazzia. |
| Palmoliva | Gen. et comb. nov | Valid | Allmon & Friend | Eocene | | United States | A member of the family Ancillariidae. Genus includes "Ancillaria" tenera Conrad and Ancillaria scamba Conrad. |
| Patagorbitestella leonensis | Sp. nov | Valid | Di Luca, Griffin & Pastorino | Miocene | Monte León Formation | Argentina | A member of the family Orbitestellidae. |
| Peringia tarkhanica | Sp. nov | Valid | Guzhov | Miocene | | Russia ( Krasnodar Krai) | A species of Peringia. |
| Pictarene | Gen. et nom. nov | Valid | Pacaud | Paleocene (Danian) | | Denmark | A member of the family Areneidae. The type species is Pictarene faxensis (a replacement name for Delphinula (Pseudoninella) depressa Ravn, 1933). |
| Pisania klaudiae | Sp. nov | Valid | Kovács & Vicián | Miocene | | Hungary | A species of Pisania. |
| Pleurotomaria durousseauorum | Sp. nov | Valid | Chaix & Grenier | Late Cretaceous (Campanian) | | France | |
| Pomatiasia | Gen. et comb. nov | Valid | Guzhov | Miocene | | Russia | A member of the family Hydrobiidae. Genus includes "Amnicola" cyclostomoides Sinzov (1880). Published online in 2023, but the issue date is listed as December 2022. |
| Ponderia chattica | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Ponderia. |
| Probaicalia okurai | Sp. nov | In press | Isaji | Early Cretaceous (Barremian) | Itsuki Formation | Japan | |
| Pseudosimnia javanensis | Sp. nov | Valid | Celzard & Dovesi | Miocene | | Indonesia | A species of Pseudosimnia. |
| Pseudotorinia grasemanni | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria  Bulgaria  Hungary | A species of Pseudotorinia. |
| Pseudotuba | Gen. et comb. nov | Valid | Harzhauser & Landau | Eocene to Miocene | | Austria  France  Hungary  Italy  Romania  United Kingdom | A member of the family Mathildidae. The type species is Tuba sulcata var. badensis Sacco (1895), raised to the rank of the species P. badensis; genus also includes "Cyclostoma" cancellata Grateloup (1828), "Tuba" pedemontana Sacco (1895), "Turbo" bellardii d'Orbigny (1852), "Littorina" cyclostomoides Deshayes (1861), "Tuba" elatospira Cossmann (1907) and "Turbo" sculptus Sowerby (1823). |
| Pterynotus poustagnacensis | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Pterynotus. |
| Pupisoma (Ptychopatula) schaeferi | Sp. nov | Valid | Kadolsky | Miocene | | Germany | A species of Pupisoma. |
| Purpurellus aquitanicus | Sp. nov | Valid | Lozouet | Oligocene and Miocene | | France | A species of Purpurellus. |
| Pustulosia | Gen. et comb. nov | Valid | Harzhauser, Guzhov & Landau | Miocene | | Ukraine | A member of the family Batillariidae. The type species is "Cerithium" submitrale Eichwald (1851); genus also includes "Cerithium" hornense Schaffer (1912). |
| Putzeysia diversii | Sp. nov | Valid | Kiel, Sami & Taviani | Miocene (Langhian to Tortonian) | | Italy | A Putzeysia. |
| Pyrgiscus naldonii | Sp. nov | Valid | Tabanelli et al. | Pliocene | | Italy | A species of Pyrgiscus. |
| Pyrgiscus ruggierii | Sp. nov | Valid | Tabanelli et al. | Pliocene | | Italy | A species of Pyrgiscus. |
| Ringicula costata chokrakensis | Ssp. nov | Valid | Guzhov | Miocene | | Russia | Published online in 2023, but the issue date is listed as December 2022. |
| Ringicula costata paratethica | Ssp. nov | Valid | Guzhov | Miocene | | Russia | Published online in 2023, but the issue date is listed as December 2022. |
| Ringicula guzhovi | Nom. nov | Valid | Landau, Harzhauser & Malaquias | Miocene | | | A species of Ringicula; a replacement name for Voluta exilis Eichwald (1829). |
| Ringicula knolli | Sp. nov | | Banerjee & Halder | Eocene | Cambay Shale | India | A species of Ringicula. |
| Ringicula subglobosa | Sp. nov | Valid | Guzhov | Miocene | | Russia | A species of Ringicula. Published online in 2023, but the issue date is listed as December 2022. |
| Rissoa federicoi | Nom. nov | Valid | Kovács & Stein | Miocene | Vienna Basin | Austria | A species of Rissoa; a replacement name for Rissoia (Turboella) acuticosta Sacco (1895). |
| Sconsia landaui | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A species of Sconsia. |
| Setia minutissima | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene | | France | A species of Setia. |
| Simplexollata | Gen. et sp. et comb. nov | Valid | Harzhauser & Landau | Oligocene to Pleistocene | | Austria  Bulgaria  Czech Republic  France  Germany  Greece  Hungary  Italy  France  Netherlands  Poland  Romania | A member of the family Architectonicidae. The type species is S. anticollata; genus also includes "Solarium" carocollatum Lamarck (1822), "Solarium" simplex Bronn (1831), "Solarium" gratteloupi d'Orbigny (1852), "Solarium" stephanense Cossmann & Peyrot (1919), "Solarium" carocollatosimplex Sacco (1892) and "Architectonica" ariei Wienrich (2007). |
| Siphoecphora gerrardi | Sp. nov | Valid | Petuch & Berschauer | Miocene | Pungo River Formation | United States ( North Carolina) | |
| Skeneoides karrineae | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene | | France | A species of Skeneoides. |
| Solatisonax pozsgayae | Sp. nov | Valid | Kovács, Leél-Őssy & Vicián | Miocene | Pétervására Formation | Hungary | A species of Solatisonax. |
| Solatisonax tavianii | Sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Romania | A species of Solatisonax. |
| Solatisonax? transversa | Sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Hungary  Romania | Possibly a species of Solatisonax. |
| Sorgenfreispira planicostata | Sp. nov | Valid | Landau, Harzhauser & Giannuzzi-Savelli | Pliocene | | Spain | A species of Sorgenfreispira. |
| Subepona leahae | Sp. nov | Valid | Squires & Groves | Eocene | Llajas Formation | United States ( California) | A species of Subepona. |
| Sulcoactaeon fallax | Sp. nov | Valid | Blagovetshenskiy | Early Cretaceous | | Russia | |
| Sulcoactaeon gerassimovi | Sp. nov | Valid | Blagovetshenskiy | Early Cretaceous | | Russia | |
| Sulcoactaeon insuetus | Sp. nov | Valid | Blagovetshenskiy | Early Cretaceous | | Russia | |
| Sulcoactaeon kremenkensis | Sp. nov | Valid | Blagovetshenskiy | Early Cretaceous | | Russia | |
| Sulcoactaeon polivnensis | Sp. nov | Valid | Blagovetshenskiy | Early Cretaceous | | Russia | |
| Sulcoactaeon rotundus | Sp. nov | Valid | Blagovetshenskiy | Early Cretaceous | | Russia | |
| Sulcoactaeon shumilkini | Sp. nov | Valid | Blagovetshenskiy | Early Cretaceous | | Russia | |
| Sulcoactaeon simbirskensis | Sp. nov | Valid | Blagovetshenskiy | Early Cretaceous | | Russia | |
| Suluspira gallica | Sp. nov | Valid | Landau, Van Dingenen & Ceulemans | Miocene | | France | A species of Suluspira. |
| Tacheocampylaea fornacis | Sp. nov | Valid | Esu & Girotti | Pleistocene | | Italy | A species of Tacheocampylaea. |
| Teiichispira teresae | Sp. nov | Valid | Bertero, Ferrari & Carrera | Ordovician | San Juan Formation | Argentina | A member of the family Macluritidae. |
| Terebra golebiowskii | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria | A species of Terebra. |
| Terebra henkmulderi | Sp. nov | Valid | Landau & Harzhauser | Pliocene (Piacenzian) | | Spain | A species of Terebra. |
| Terebra praehistrio | Sp. nov | Valid | Landau & Harzhauser | Pliocene (Piacenzian) | | Spain | A species of Terebra. |
| Textiliomurex problematicus | Sp. nov | Valid | Lozouet | Oligocene | | France | A member of the family Muricidae. |
| Theodisca | Gen. et comb. nov | | Harzhauser, Guzhov & Landau | Miocene to Pleistocene | | Austria | A member of the family Potamididae. The type species is "Cerithium" theodiscum Rolle (1856); genus also includes "Cerithium" cicur Zhizhchenko (1934), "Potamides" biseriatus Friedberg (1914), "Potamides" azerbajdjanicus K. A. Ali-Zade (1940), "Cerithium" graecum Deshayes (1832) and "Cerithium" etruscum Mayer (1864). The generic name is shared with Theodisca Müller (1858). |
| Timbellus cailloelensis | Sp. nov | Valid | Ledon et al. | Eocene (Lutetian) | | France | A species of Timbellus. |
| Timbellus hesdinensis | Sp. nov | Valid | Ledon et al. | Eocene (Lutetian) | | France | A species of Timbellus. |
| Timbellus wozniaki | Sp. nov | Valid | Ledon et al. | Eocene (Lutetian) | | France | A species of Timbellus. |
| Toroidia tavianii | Sp. nov | Valid | Micali & Villari | Plio-Pleistocene | | Italy | |
| Triphora (sensu lato) freixiensis | Sp. nov | Valid | Landau, Bakker & Marques da Silva | Pliocene | Carnide Formation | Portugal | A member of the family Triphoridae. |
| Trisecphora governorensis | Sp. nov | Valid | Petuch & Berschauer | Miocene | Calvert Formation | United States ( Maryland) | A species of Trisecphora. |
| Trisecphora precursor | Sp. nov | Valid | Petuch & Berschauer | Miocene | Pungo River Formation | United States ( North Carolina) | A species of Trisecphora. |
| Trisecphora (Recurvecphora) recurvicostata | Sp. nov | Valid | Petuch & Berschauer | Miocene | Pungo River Formation | United States ( North Carolina) | A species of Trisecphora. |
| Tritia bagolyensis | Sp. nov | Valid | Kovács & Vicián | Miocene | | Hungary | A species of Tritia. |
| Tritia domonkosi | Sp. nov | Valid | Kovács & Vicián | Miocene | | Hungary | A species of Tritia. |
| Tritia gerdsteini | Sp. nov | Valid | Kovács & Vicián | Miocene | | Hungary | A species of Tritia. |
| Tritia letkesensis | Sp. nov | Valid | Kovács & Vicián | Miocene | | Hungary | A species of Tritia. |
| Trubatsa larratensis | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Trubatsa. |
| Trubatsa subaturensis | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Trubatsa. |
| Trubatsa trounensis | Sp. nov | Valid | Lozouet | Oligocene | | France | A species of Trubatsa. |
| Turbonilla landii | Sp. nov | Valid | Tabanelli et al. | Pliocene | | Italy | A species of Turbonilla. |
| Turbonilla peculiaris | Sp. nov | Valid | Tabanelli et al. | Pliocene | | Italy | A species of Turbonilla. |
| Turbonilla zangherii | Sp. nov | Valid | Tabanelli et al. | Pliocene | | Italy | A species of Turbonilla. |
| Turritellinella devinensis | Sp. nov | Valid | Biskupič | Miocene | Studienka Formation | Slovakia | A member of the family Turritellidae. |
| Umbilia tomdarraghi | Sp. nov | Valid | Southgate & Militz | Pliocene | | Australia | A species of Umbilia. |
| Vermicularia katiae | Sp. nov | Valid | Anderson & Allmon | Miocene–Pliocene | | Dominican Republic | A species of Vermicularia. Published online in 2024, but the issue date is listed as December 2023. |
| Vexiguraleus iberoangulatus | Sp. nov | Valid | Landau, Harzhauser & Giannuzzi-Savelli | Pliocene | | Spain | A member of the family Mangeliidae. |
| Xamaycarene | Gen. et comb. nov | Valid | Pacaud | Late Cretaceous (Maastrichtian) | Shaw Castle Shale | Jamaica | A member of the family Areneidae. The type species is "Arene" truncatosphaera Sohl (1998). |
| Xestopyrguloides ? sagitta | Sp. nov | Valid | Neubauer & Wesselingh | Pleistocene (Gelasian) | Kolankaya Formation | Turkey | A member of the family Hydrobiidae. |
| Zafrona olgapirosae | Sp. nov | Valid | Kovács & Vicián | Miocene | | Hungary | A species of Zafrona. |

### Gastropod research

* Review of the world-wide fossil record and evolutionary history of freshwater gastropods is published by Neubauer (2023).
* A study on the biogeographic distributions of pleurotomariids throughout their evolutionary history from Maastrichtian to Holocene is published by Bose, Das & Mondal (2023).
* A study on the diversity of potamidids and batillariids in the Paratethys through time is published by Harzhauser et al. (2023), who interpret the studied groups as a whole not to be mangrove indicators, and find only members of the genera Mesohalina, Ptychopotamides, Terebralia and probably Tiarapirenella to be associated with mangroves during the Oligocene to early Middle Miocene in the Central Paratethys, while other members of the studied groups adapted to environments devoid of mangroves.
* Revision and study on the affinities of the Plio-Pleistocene turritellids from the Atlantic Coastal Plain and Florida is published by Friend et al. (2023).

## Other molluscs

| Name | Novelty | Status | Authors | Age | Type locality | Location | Notes |
| Agidelia | Gen. et sp. nov | | Mazaev | Permian | | Russia | A member of Rostroconchia belonging to the family Bransoniidae. Genus includes new species A. magnifica. Published online in 2024, but the issue date is listed as December 2023. |
| Arceodomus fredericksi | Sp. nov | Valid | Mazaev | Permian | | Russia | A member of Rostroconchia. Published online in 2024, but the issue date is listed as December 2023. |
| Ashaconcha | Gen. et sp. nov | | Mazaev | Permian | | Russia | A member of Rostroconchia belonging to the family Bransoniidae. Genus includes new species A. rara. Published online in 2024, but the issue date is listed as December 2023. |
| Celtopileus | Gen. et sp. nov | Valid | Cope & Ebbestad | Ordovician (Floian) | Ogof Hen Formation | United Kingdom | A member of Tergomya belonging to the group Kirengellida and possibly to the family Hypseloconidae. The type species is C. calvapex. |
| Costulaconus | Gen. et sp. nov | Valid | Cope & Ebbestad | Ordovician (Floian) | Ogof Hen Formation | United Kingdom | A member of Tergomya belonging to the group Kirengellida and possibly to the family Hypseloconidae. The type species is C. mirificus. |
| Eotebenna danica | Sp. nov | Valid | Peel & Berg-Madsen | Cambrian (Drumian and Guzhangian) | Andrarum Limestone | Denmark  Sweden | A member of Helcionelloida belonging to the family Yochelcionellidae. |
| Hensoniconus | Gen. et comb. nov | Valid | Peel | Cambrian (Wuliuan) | Henson Gletscher Formation | Greenland | A member of Helcionelloida. The type species is Scenella? siku Peel & Kouchinsky (2022). |
| Hoarepora uralica | Sp. nov | | Mazaev | Permian | | Russia | A member of Rostroconchia belonging to the family Bransoniidae. Published online in 2024, but the issue date is listed as December 2023. |
| Incisiochiton pustulifer | Sp. nov | Valid | Sirenko & Dell'Angelo | Paleocene | Luzanovka Beds | Ukraine | A chiton belonging to the family Schizochitonidae. |
| Proplina areniga | Sp. nov | Valid | Cope & Ebbestad | Ordovician (Floian) | Ogof Hen Formation | United Kingdom | A member of Tergomya belonging to the group Tryblidiida and to the family Proplinidae. |
| Proplina? obtusa | Sp. nov | Valid | Cope & Ebbestad | Ordovician (Floian) | Ogof Hen Formation | United Kingdom | A member of Tergomya belonging to the group Tryblidiida and to the family Proplinidae. |

### Other mollusc research

* Qiang et al. (2023) describe new fossil material of Anabarella plana from the Cambrian Yanjiahe Formation (China), and consider A. plana to be the only member of the genus Anabarella definitely present in South China.

## General research

* Slater (2023) describes microscopic molluscan radulae from the Cambrian (Wuliuan) Borgholm Formation (Sweden), similar to the radulae of extant gastropods specialized for piercing and sucking the tissues of green algae, and interpret this finding as indicating that this form of herbivory was already present among Cambrian molluscs.
* Fossil material representing the first evidence of gastropod drilling predation on molluscan prey from Coniacian is reported from the Anaipadi Member of the Garudamangalam Formation (India) by Mukhopadhyay et al. (2023).
* A diverse molluscan assemblage dominated by turritellid gastropods from Kachchh (India), originally interpreted as Late Jurassic in age, is reinterpreted as more likely Miocene in age by Fürsich et al. (2023).