# 2021 in paleomalacology

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This list of fossil molluscs described in 2021 is a list of new taxa of fossil molluscs that were described during the year 2021, as well as other significant discoveries and events related to molluscan paleontology that occurred in 2021.

## Ammonites
### New taxa

| Name | Novelty | Status | Authors | Age | Type locality | Country | Notes |
| Abichites infirmis | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | |
| Abichites ovalis | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | |
| Agathiceras iranicum | Sp. nov | Valid | Korn & Ghaderi in Korn et al. | Carboniferous-Permian boundary | | Iran | |
| Alienisphinctes | Gen. et sp. nov | Valid | Énay & Mangold | Late Jurassic (Kimmeridgian) | Jubaila Formation | Saudi Arabia | A member of the family Ataxioceratidae. The type species is A. cavelieri. |
| Amaltheus orientalis | Sp. nov | Valid | Nakada et al. | Early Jurassic (Pliensbachian) | Kuruma Group | Japan | |
| Arasella falcata | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | An ammonite of uncertain placement, probably a member of the family Xenodiscidae. |
| Arcestes lawsi | Sp. nov | Valid | Taylor, Guex & Lucas | Late Triassic (Rhaetian) | Gabbs Formation | United States ( Nevada) | |
| Arnioceras ritterbushi | Sp. nov | Valid | Taylor & Guex | Early Jurassic (Sinemurian) | Sunrise Formation | United States ( Nevada) | |
| Arnioceras sparsum | Sp. nov | Valid | Taylor & Guex | Early Jurassic (Sinemurian) | Sunrise Formation | United States ( Nevada) | |
| Artyomites | Gen. et sp. nov | Valid | Smyshlyaeva & Zakharov | Early Triassic (Olenekian) | | Russia | A member of the family Palaeophyllitidae. Genus includes new species A. antiquus. |
| Aulatornoceras frenklerae | Sp. nov | Valid | Söte et al. | Devonian (Frasnian) | Sand Formation | Germany | A member of the family Tornoceratidae. |
| Aulatornoceras steinhauseni | Sp. nov | Valid | Söte et al. | Devonian (Frasnian) | Sand Formation | Germany | A member of the family Tornoceratidae. |
| Aulatornoceras ventrosulcatum | Sp. nov | Valid | Söte et al. | Devonian (Frasnian) | Sand Formation | Germany | A member of the family Tornoceratidae. |
| Boucaulticeras hawthornensis | Sp. nov | Valid | Taylor & Guex | Early Jurassic (Sinemurian) | Sunrise Formation | United States ( Nevada) | A member of the family Schlotheimiidae. |
| Bullatimorphites szontaghi | Sp. nov | Valid | Galácz | | | | |
| Caloceras avus | Sp. nov | Valid | Kment | Early Jurassic (Hettangian) | | | |
| Catrisimoceras | Gen. et comb. nov | Valid | Nannarone & Bilotta | Late Jurassic (Tithonian) | | Italy | A member of Perisphinctoidea belonging to the family Simoceratidae and possibly to the subfamily Lytogyroceratinae. The type species is "Simoceras" catrianum Zittel (1870). |
| Cheltonia howarthi | Sp. nov | Valid | Simms & Edmunds | Early Jurassic | | United Kingdom | |
| Cibolaites petraschecki | Sp. nov | Valid | Wilmsen et al. | Late Cretaceous (Turonian) | Brießnitz Formation | Germany | |
| Clivotirolites | Gen. et 2 sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | A member of the family Dzhulfitidae. The type species is C. decoratus; genus also includes C. petilus. |
| Crassotornoceras hetzeneggeri | Sp. nov | Valid | Söte et al. | Devonian (Frasnian) | Sand Formation | Germany | A member of the family Tornoceratidae. |
| Crassotornoceras nudum | Sp. nov | Valid | Söte et al. | Devonian (Frasnian) | Sand Formation | Germany | A member of the family Tornoceratidae. |
| Crioceratites claveli | Sp. nov | In press | Bert et al. | Early Cretaceous (Hauterivian) | Vocontian Basin | France | |
| Didymoceras morozumii | Sp. nov | Valid | Misaki & Tsujino | Late Cretaceous (Campanian) | Hiketa Formation | Japan | |
| Dimorphodiscus | Gen. et sp. et comb. nov | Valid | Vermeulen et al. | Early Cretaceous (Barremian) | | Algeria Crimea  France | A member of the family Holcodiscidae. The type species is D. lerisae; genus also includes D. uhligi (Karakash, 1907), D. sayni (Joleaud, 1912) and "Metahoplites" postnodosum Vermeulen et al. (2017). |
| Discoscaphites mullinaxorum | Sp. nov | Valid | Witts et al. | Late Cretaceous (Maastrichtian) | Corsicana Formation | United States ( Texas) | |
| Domanikoceras martenbergense | Sp. nov | Valid | Korn | Devonian (Frasnian) | | Germany | A member of the family Tornoceratidae. |
| Dzhulfites brevisellatus | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | |
| Eoasianites baghevangensis | Sp. nov | Valid | Korn & Ghaderi in Korn et al. | Carboniferous-Permian boundary | | Iran | |
| Eoermoceras | Gen. et 2 sp. nov | Valid | Énay & Mangold | Middle Jurassic (Bajocian) | Dhruma Formation | Saudi Arabia | A member of the family Stephanoceratidae. The type species is E. glabrum; genus also includes new species E. angulatidomus. |
| Eolytoceras rohrbachensis | Sp. nov | Valid | Kment | Early Jurassic (Hettangian) | | | |
| Esfahanites | Gen. et sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | A member of the family Dzhulfitidae. The type species is E. armatus. |
| Eutomoceras paladeji | Sp. nov | Valid | Tongtherm, Nabhitabhata & Tuanapaya | Triassic | Chaiburi Formation | Thailand | A member of the family Ceratitidae. |
| Eutomoceras wantanae | Sp. nov | Valid | Tongtherm, Nabhitabhata & Tuanapaya | Triassic | Chaiburi Formation | Thailand | A member of the family Ceratitidae. |
| Evopharciceras | Gen. et sp. et comb. nov | Valid | Korn & Bockwinkel | Devonian (Givetian) | Roteisenstein Formation | Germany  Morocco | A member of Agoniatitida belonging to the family Pharciceratidae. The type species is E. formosum; genus also includes "Pharciceras" evolvens Bockwinkel, Becker & Ebbighausen (2009). |
| Extropharciceras metallicum | Sp. nov | Valid | Korn & Bockwinkel | Devonian (Givetian) | Roteisenstein Formation | Germany | A member of Agoniatitida belonging to the family Pharciceratidae. |
| Galfettites orientalis | Sp. nov | Valid | Smyshlyaeva & Zakharov | Early Triassic (Olenekian) | | Russia | A member of the family Galfettitidae. |
| Glyptophiceras mirum | Sp. nov | Valid | Smyshlyaeva & Zakharov | Early Triassic (Olenekian) | | Russia | A member of the family Xenoceltitidae. |
| Gonioclymenia junggarensis | Sp. nov | In press | Zong, Becker & Ma | Devonian (Famennian) | Hongguleleng Formation | China | |
| Hadrothisbites hanwangensis | Sp. nov | In press | Mietto et al. | Late Triassic (Carnian) | Ma'antang Formation | China | |
| Holcodiscus pseudocaillaudi | Sp. nov | Valid | Vermeulen et al. | Early Cretaceous (Barremian) | | France | A member of the family Holcodiscidae. |
| Hulenites kitamurai | Sp. nov | In press | Matsukawa | Early Cretaceous (Aptian) | Todai Formation | Japan | |
| Inaptychoceras | Gen. et sp. nov | In press | Matsukawa | Early Cretaceous (Aptian) | Todai Formation | Japan | Genus includes new species I. koikei. |
| Kislovodskoceras | Gen. et sp. nov | Valid | Polkovoy | Early Cretaceous (Aptian) | | Russia | A member of the family Desmoceratidae. The type species is K. kislovodskense. |
| Kurnubiella fallax | Sp. nov | Valid | Énay & Mangold | Middle Jurassic (Callovian) | Upper Dhruma Formation | Saudi Arabia | A member of the family Pachyceratidae. |
| Laevisimoceras | Gen. et sp. nov | Valid | Nannarone & Bilotta | Late Jurassic (Tithonian) | | Italy | A member of Perisphinctoidea belonging to the family Simoceratidae and the subfamily Parasimoceratinae. The type species is L. inornatum. |
| Linguatornoceras asbeckense | Sp. nov | Valid | Korn | Devonian (Frasnian) | | Germany | A member of the family Tornoceratidae. |
| Lunupharciceras kochi | Sp. nov | Valid | Korn & Bockwinkel | Devonian (Givetian) | Roteisenstein Formation | Germany | A member of Agoniatitida belonging to the family Pharciceratidae. |
| Lutites | Gen. et 5 sp. et comb. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | A member of the family Dzhulfitidae. The type species is L. lyriformis; genus also includes new species L. alius, L. paucis, L. plicatus and L. profundus, as well as Alibashites stepanovi Korn & Ghaderi in Korn et al. (2015). |
| Lytogyroceras tuberculatum | Sp. nov | Valid | Nannarone & Bilotta | Late Jurassic (Tithonian) | | Italy | A member of Perisphinctoidea belonging to the family Simoceratidae and the subfamily Lytogyroceratinae. |
| Maenioceras ornatum | Sp. nov | Valid | Korn & Bockwinkel | Devonian (Givetian) | Roteisenstein Formation | Germany | A member of Agoniatitida belonging to the family Maenioceratidae. |
| Nejdia duartei | Sp. nov | Valid | Goy & Comas-Rengifo | Early Jurassic (Toarcian) | | | A member of the family Hildoceratidae. |
| Obtusicostites gigas | Sp. nov | Valid | Énay & Mangold | Middle Jurassic (Callovian) | Upper Dhruma Formation | Saudi Arabia | A member of the family Perisphinctidae. |
| Ophimullericeras | Gen. et sp. nov | Valid | Jenks et al. | Early Triassic | Dinwoody Formation | United States ( Nevada) | A member of Ceratitida belonging to the group Meekocerataceae and the family Mullericeratidae. The type species is O. paullae. |
| Pachyerymnoceras arabicum | Sp. nov | Valid | Énay & Mangold | Middle Jurassic (Callovian) | Tuwaiq Mountain Limestone Formation | Saudi Arabia | A member of the family Pachyceratidae. |
| Pachyerymnoceras magnum | Sp. nov | Valid | Énay & Mangold | Middle Jurassic (Callovian) | Tuwaiq Mountain Limestone Formation | Saudi Arabia | A member of the family Pachyceratidae. |
| Palaeophyllites mishkini | Sp. nov | Valid | Smyshlyaeva & Zakharov | Early Triassic (Olenekian) | | Russia | A member of the family Palaeophyllitidae. |
| Paracadoceras vasily | Sp. nov | Valid | Gulyaev in Gulyaev & Ippolitov | Middle Jurassic (Callovian) | | Ukraine | |
| Paracochloceras nunminensis | Sp. nov | Valid | Taylor, Guex & Lucas | Late Triassic (Rhaetian) | Gabbs Formation | United States ( Nevada) | |
| Parahoplites inaensis | Sp. nov | In press | Matsukawa | Early Cretaceous (Aptian) | Todai Formation | Japan | |
| Parasimoceras | Gen. et 2 sp. nov | Valid | Nannarone & Bilotta | Late Jurassic (Tithonian) | | Italy | A member of Perisphinctoidea belonging to the family Simoceratidae and the subfamily Parasimoceratinae. The type species is P. venturii; genus also includes P. pseudostenonis. |
| Paratirolites aduncus | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | |
| Paratirolites baghukensis | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | |
| Paratirolites lanceolobatus | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | |
| Paratirolites robustus | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | |
| Paratirolites rubens | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | |
| Peripleurites gabbensis | Sp. nov | Valid | Taylor, Guex & Lucas | Late Triassic (Rhaetian) | Gabbs Formation | United States ( Nevada) | A member of Choristocerataceae belonging to the family Rhabdoceratidae. |
| Pharciceras beyrichi | Sp. nov | Valid | Korn & Bockwinkel | Devonian (Givetian) | Roteisenstein Formation | Germany | A member of Agoniatitida belonging to the family Pharciceratidae. |
| Pharciceras ferrum | Sp. nov | Valid | Korn & Bockwinkel | Devonian (Givetian) | Roteisenstein Formation | Germany | A member of Agoniatitida belonging to the family Pharciceratidae. |
| Pharciceras kruegeri | Sp. nov | Valid | Korn & Bockwinkel | Devonian (Givetian) | Roteisenstein Formation | Germany | A member of Agoniatitida belonging to the family Pharciceratidae. |
| Placites heggi | Sp. nov | Valid | Taylor, Guex & Lucas | Late Triassic (Rhaetian) | Gabbs Formation | United States ( Nevada) | A member of the family Gymnitidae. |
| Planisimoceras | Gen. et sp. nov | Valid | Nannarone & Bilotta | Late Jurassic (Tithonian) | | Italy | A member of Perisphinctoidea belonging to the family Simoceratidae and the subfamily Parasimoceratinae. The type species is P. costotuberculatum. |
| Pluripharciceras ahlburgi | Sp. nov | Valid | Korn & Bockwinkel | Devonian (Givetian) | Roteisenstein Formation | Germany | A member of Agoniatitida belonging to the family Pharciceratidae. |
| Pronjaites yolkinensis | Sp. nov | Valid | Mitta | Early Cretaceous | | Russia | |
| Pseudogalfettites | Gen. et sp. nov | Valid | Smyshlyaeva & Zakharov | Early Triassic (Olenekian) | | Russia | A member of the family Galfettitidae. Genus includes new species P. sakhnoi. |
| Psiloceras pseudocostosum | Sp. nov | Valid | Kment | Early Jurassic (Hettangian) | | | |
| Retrotornoceras juxi | Sp. nov | Valid | Söte et al. | Devonian (Frasnian) | Sand Formation | Germany | A member of the family Tornoceratidae. |
| Rhacophyllites mulleri | Sp. nov | Valid | Taylor, Guex & Lucas | Late Triassic (Rhaetian) | Gabbs Formation | United States ( Nevada) | |
| Rhacophyllites volcanoensis | Sp. nov | Valid | Taylor, Guex & Lucas | Late Triassic (Rhaetian) | Gabbs Formation | United States ( Nevada) | |
| Rollierites biplicatum | Sp. nov | Valid | Jain & Mazur | Middle Jurassic (Callovian) | | Poland | A member of the family Pachyceratidae. |
| Sandbergeroceras archiaci | Sp. nov | Valid | Korn & Bockwinkel | Devonian (Givetian) | Roteisenstein Formation | Germany | A member of Agoniatitida belonging to the family Triainoceratidae. |
| Saudicostites | Gen. et sp. nov | Valid | Énay & Mangold | Middle Jurassic (Bathonian) | Dhruma Formation | Saudi Arabia | A member of Perisphinctoidea of uncertain phylogenetic placement. The type species is S. arabicus. |
| Shevyrevites corrugatus | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | A member of the family Xenodiscidae. |
| Sigaloceras fundator | Sp. nov | Valid | Gulyaev in Gulyaev & Ippolitov | Middle Jurassic (Callovian) | | Ukraine | |
| Sigaloceras kiselevi | Sp. nov | Valid | Gulyaev in Gulyaev & Ippolitov | Middle Jurassic (Callovian) | | Ukraine | |
| Simocosticeras | Gen. et sp. nov | Valid | Nannarone & Bilotta | Late Jurassic (Tithonian) | | Italy | A member of Perisphinctoidea belonging to the family Simoceratidae and the subfamily Simoceratinae. The type species is S. biornatum. |
| Sinotropites | Gen. et sp. nov | In press | Mietto et al. | Late Triassic (Carnian) | Ma'antang Formation | China | Genus includes new species S. sichuanensis. |
| Sonninia (Euhoploceras) crassicostae | Sp. nov | Valid | Énay & Mangold | Middle Jurassic (Bajocian) | Lower Dhruma Formation | Saudi Arabia | A member of the family Sonniniidae. |
| Sonninia (Euhoploceras) turbator | Sp. nov | Valid | Énay & Mangold | Middle Jurassic (Bajocian) | Lower Dhruma Formation | Saudi Arabia | A member of the family Sonniniidae. |
| Sonoraceras | Gen. et sp. nov | In press | Samaniego-Pesqueira, Moreno-Bedmar & Álvarez-Sánchez | Early Cretaceous (Aptian) | | Mexico | Genus includes new species S. tepachensis. |
| Stenopharciceras lotzi | Sp. nov | Valid | Korn & Bockwinkel | Devonian (Givetian) | Roteisenstein Formation | Germany | A member of Agoniatitida belonging to the family Pharciceratidae. |
| Stoliczkaia (Lamnayella) duboisi | Sp. nov | Valid | Kennedy & Latil | Late Cretaceous (Cenomanian) | | France | A member of the family Lyelliceratidae. |
| Stoyanowites parallelus | Sp. nov | Valid | Korn & Hairapetian in Korn et al. | Permian (Changhsingian) | Hambast Formation | Iran | A member of the family Dzhulfitidae. |
| Strenoceras djangurense | Sp. nov | Valid | Mitta | Middle Jurassic (Bajocian) | | Russia | |
| Sulcicostites | Gen. et sp. nov | Valid | Nannarone & Bilotta | Late Jurassic (Tithonian) | | Italy | A member of Perisphinctoidea belonging to the family Simoceratidae and the subfamily Simoceratinae. The type species is S. costatus. |
| Timorites dendroides | Sp. nov | Valid | Korn & Ghaderi in Tabrizi et al. | Permian (Wuchiapingian) | Julfa Formation | Iran | A member of the family Cyclolobidae. |
| Tornoceras aequilobum | Sp. nov | Valid | Söte et al. | Devonian (Frasnian) | Sand Formation | Germany | A member of the family Tornoceratidae. |
| Tornoceras fundibulum | Sp. nov | Valid | Korn | Devonian (Famennian) | | | A member of the family Tornoceratidae. |
| Tornoceras occasus | Sp. nov | Valid | Korn | Late Devonian | | Morocco | A member of the family Tornoceratidae. |
| Tornoceras ortus | Sp. nov | Valid | Korn | Late Devonian | | Morocco | A member of the family Tornoceratidae. |
| Tornoceras vretterense | Sp. nov | Valid | Korn | Devonian (Givetian) | | | A member of the family Tornoceratidae. |
| Tropaeum evolutum | Sp. nov | In press | Lehmann & Bayliss | Early Cretaceous (Aptian) | Hythe Formation | United Kingdom | |
| Tropidoceras komarovi | Sp. nov | Valid | Zaitsev | Early Jurassic | | Crimean Peninsula | |
| Vicininodiceras dalriatense | Sp. nov | Valid | Simms & Edmunds | Early Jurassic | | United Kingdom | |
| Volanoceras cuneospinatum | Sp. nov | Valid | Nannarone & Bilotta | Late Jurassic (Tithonian) | | Italy | A member of Perisphinctoidea belonging to the family Simoceratidae and the subfamily Volanoceratinae. |
| Waehneroceras morawetzi | Sp. nov | Valid | Kment | Early Jurassic (Hettangian) | | | |
| Wordieoceras mullenae | Sp. nov | Valid | Jenks et al. | Early Triassic | Dinwoody Formation | United States ( Nevada) | A member of Ceratitida belonging to the group Meekocerataceae and the family Ophiceratidae. |

### Research

* A modern review of the palaeobiology of heteromorph ammonoids is published by Hoffmann et al. (2021), including details of their anatomy, buoyancy, locomotion, predators, diet, palaeoecology, and extinction.
* A study on the impact of the Permian–Triassic extinction event on the morphological diversity of ammonites is published by Dai, Korn & Song (2021).
* A study on the morphology and ontogeny of whorl profiles of the late Anisian ceratitid ammonites is published by Bischof et al. (2021).
* An exceptionally preserved specimen of Sigaloceras enodatum, providing information on the anatomy of ammonite muscles, is described from the Middle Jurassic (Callovian) Kellaways Sand Member of Colne Gravel (Gloucestershire, United Kingdom) by Cherns et al. (2021), who evaluate the implications of this specimen for the knowledge of the swimming mechanism of ammonites.
* Soft parts of a perisphinctid belonging to the genus Subplanites, separated from the conch either taphonomically or during a failed predation, are described from the Tithonian conservation deposits of Wintershof (southern Germany) by Klug et al. (2021).
* The first physical compression experiments on model ammonite septa are performed by Johnson et al. (2021), who attempt to determine whether the increasingly complex fractal margins of ammonite septa might have evolved to increase resistance to shell-crushing predators.
* A study aiming to determine the function of complex septa in the ammonite shell, providing evidence of a relationship between septal complexity and capacity for liquid retention within chambers of the shell, likely improving buoyancy regulation, is published by Peterman et al. (2021).
* Two specimens of Peltoceras athleta having both female and male features are described from Callovian limestone beds in Méron near Montreuil-Bellay (France) by Frau & Boursicot (2021), who interpret these specimens as cases of intersexuality in ammonites.
* Soft tissue remains preserved within the conch of a specimen of Proleymeriella schrammeni from the Albian of Germany are described by Hoffmann et al. (2021).
* A study on the arrangement in space and probable nature of hook-like structures found with specimens of Rhaeboceras halli is published by Smith et al. (2021), who interpret these structures as representing part of the brachial crown armature, and propose a hypothetical reconstruction of an ammonite brachial crown.
* A study on the systematics and phylogeny of the genus Aegocrioceras is published by Weinkauf, Hoffmann & Wiedenroth (2021).
* A study on the hydrostatic properties of Baculites compressus, and on their implications for the knowledge of the swimming capabilities and ecology of this ammonite and orthoconic cephalopods in general, is published by Peterman & Ritterbush (2021).
* Revision of the fossil material of Parapuzosia seppenradensis, including historic specimens from Europe and the United States and new material from England and Mexico, and a study on the ontogeny, distribution and evolution of this ammonite, is published by Ifrim et al. (2021).
* A study on the habitat depth preferences of Hoploscaphites constrictus from the European Boreal Chalk Sea, as indicated by stable isotope thermometry of aptychi and by data from predation marks on the scaphitid moulds, is published by Machalski et al. (2021).
* A study on the relationship between sutural complexity and body size in Cretaceous ammonites is published by Pérez-Claros (2021).

## Other cephalopods
### New taxa

| Name | Novelty | Status | Authors | Age | Type locality | Country | Notes |
| Acrocoelites ippolitae | Sp. nov | Valid | Weis in Weis et al. | Middle Jurassic (Aalenian) | | Germany | A belemnite. |
| Anglonautilus hewaidyi | Sp. nov | In press | Moneer, Bazeen & Kassab | Late Cretaceous (Maastrichtian) | | Egypt | A nautiloid cephalopod. |
| Angulithes monqarensis | Sp. nov | In press | Moneer, Bazeen & Kassab | Late Cretaceous (Maastrichtian) | | Egypt | A nautiloid cephalopod. |
| Arionoceras tokushimaense | Sp. nov | Valid | Niko | Silurian (Ludlow) | Suberidani Group | Japan | |
| Bactroceras fluvii | Sp. nov | Valid | Kröger & Pohle | Ordovician (Dapingian) | Valhallfonna Formation | Norway | |
| Boreopeltis ifrimae | Sp. nov | In press | Fuchs & Stinnesbeck | Late Cretaceous (Turonian) | | Mexico | |
| Buttsoceras buldrebreenense | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A member of the family Troedssonellidae. |
| Cycloplectoceras hinlopense | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A member of the family Tarphyceratidae. |
| Cyclostomiceras profilstrandense | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A member of the family Cyclostomiceratidae. |
| Deltoceras beluga | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A member of the family Cyclostomiceratidae. |
| Eosomichelinoceras borealis | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A member of the family Baltoceratidae. |
| Eosomichelinoceras submedius | Sp. nov | Valid | Evans et al. | Ordovician (Darriwilian) | Pelmis Formation | Iran | A member of the family Baltoceratidae. |
| Ethanoceras | Gen. et sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A relative of Rioceras. The type species is E. solitudines. |
| Gzheloceras aisenvergi | Sp. nov | Valid | Dernov | Carboniferous (Serpukhovian) | Samara Formation | Ukraine | A member of the family Tainoceratidae. |
| Hemichoanella occulta | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | |
| Hinlopoceras | Gen. et 2 sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A relative of Rioceras. The type species is H. tempestatis; genus also includes H. venti. |
| Jovellania praetermissa | Sp. nov | Valid | Brauckmann & Koch | Devonian (Givetian) | Massenkalk Formation | Germany | |
| Knightoceras extorris | Sp. nov | Valid | Dernov | Carboniferous (Pennsylvanian) | | Ukraine | A member of the family Koninckioceratidae. |
| Lawrenceoceras ebenus | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | |
| Lawrenceoceras larus | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | |
| Litoceras profilbekkenense | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | |
| Mojsvaroceras gianii | Sp. nov | Valid | Pieroni & Prinoth | Middle Triassic (Anisian) | | Italy | A nautiloid. |
| Nyfrieslandoceras | Gen. et sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A member of Oncocerida belonging to the family Phthanoncoceratidae. The type species is N. bassleroceroides. |
| Olenidslettoceras | Gen. et sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A member of Oncocerida belonging to the family Phthanoncoceratidae. The type species is O. farmi. |
| Paracenoceras waageni | Sp. nov | Valid | Halder | Middle Jurassic (Callovian) | Chari Formation | India | A member of the family Paracenoceratidae. |
| Planetoceras yefimenkoi | Sp. nov | Valid | Dernov | Carboniferous (Bashkirian) | Mospinka Formation | Ukraine | A member of the family Koninckioceratidae. |
| Proterocameroceras valhallfonnense | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | |
| Protocycloceras minor | Sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A member of the family Troedssonellidae. |
| Rhynchorthoceras yizanense | Sp. nov | Valid | Fang in Fang et al. | Ordovician | | China | A member of Lituitida. |
| Sinoceras complexum | Sp. nov | Valid | Fang in Fang et al. | Ordovician | | China | A member of Lituitida. |
| Sorosoceras | Gen. et sp. nov | Valid | Evans et al. | Ordovician (Darriwilian) | Pelmis Formation | Iran | A member of the family Geisonoceratidae. The type species is S. castellum. |
| Svalbardoceras | Gen. et 2 sp. nov | Valid | Kröger & Pohle | Ordovician (Floian) | Valhallfonna Formation | Norway | A relative of Rioceras. The type species is S. sterna; genus also includes S. skua. |
| Tyrioceras longicameratum | Sp. nov | Valid | Fang in Fang et al. | Ordovician | | China | A member of Lituitida. |
| Xiaohenautilus mulleni | Sp. nov | Valid | Jenks et al. | Early Triassic | Dinwoody Formation | United States ( Nevada) | A member of Nautilida belonging to the group Trigonoceratoidea and the family Grypoceratidae. |

### Research

* New fossil material with shell features that characterize early cephalopods is described from the Cambrian (Terreneuvian) Bonavista Formation (Canada) by Hildenbrand et al. (2021), who interpret this finding as possibly representing the earliest cephalopods known to date, potentially pushing the origin of cephalopods back in time by about 30 million years, to the time before the first occurrence of euarthropods.
* Two specimens of Syrionautilus libanoticus preserving soft parts, including a specimen showing an imprint of the conch, are described from the Cenomanian of Hadjoula (Lebanon) by Klug et al. (2021).
* A study on the diversity patterns and spatial structure of belemnite assemblages in Western Tethys Ocean during the Early Jurassic is published by Neige, Weis & Fara (2021).
* A study on morphological changes of belemnites across the Pliensbachian-Toarcian boundary event, based on data from the Peniche GSSP section (Portugal), is published by Nätscher et al. (2021).
* A study on chemistry, organization and genesis of circular structures (superficially resembling chromatophores) preserved in coleoid cephalopod specimens from the Jurassic of Germany and the Cretaceous of Lebanon is published by Klug et al. (2021).
* A well-preserved soft-body imprint of a fossil squid is described from the lower Oligocene of the Krasnodar region (Russia) by Mironenko et al. (2021), who interpret this finding as the first unquestionable representative of Teuthida in the fossil record known to date, and report preservation of fish remains in the stomach contents of this squid, indicative of its piscivorous diet.
* A specimen of Jeletzkyteuthis coriacea holding a specimen of Parabelopeltis flexuosa in its arms, with the apex very close to its jaws, is described from the Toarcian Posidonia Shale (Germany) by Klug et al. (2021), who interpret this finding as a case of frozen predatory behaviour of two different octobrachian species.
* Redescription of the gladius of the holotype specimen of Necroteuthis hungarica is published by Košťák et al. (2021), who reinterpret this species as a member of the family Vampyroteuthidae linking Mesozoic loligosepiids with extant Vampyroteuthis.
* Klompmaker & Landman (2021) describe the oldest drill holes produced by octopodoids in lucinid bivalve specimens from the Campanian of South Dakota, indicating that the drilling habit evolved early in the evolutionary history of Octopodoidea.

## Gastropods
### New taxa

| Name | Novelty | Status | Authors | Age | Type locality | Country | Notes |
| Acirsa ambrosii | Sp. nov | Valid | Brunetti & Cresti | Pliocene | | Italy | A species of Acirsa. |
| Acirsa (Notacirsa) texana | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Acirsa. |
| Acteon pseudotypica | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Acteon. |
| Acutitomaria | Gen. et sp. nov | Valid | Karapunar & Nützel | Late Triassic | San Cassiano Formation | Italy | A member of Pleurotomariida. Genus includes new species A. kustatscherae. |
| Alatostrombus | Gen. et sp. et comb. nov | Valid | Raven | Miocene | | Indonesia  Malaysia | A member of the family Strombidae. Genus includes new species A. acutalatus, as well as "Strombus" sedanensis Martin (1899). |
| Alvania absuturalis | Sp. nov | Valid | Chirli & Forli | Pliocene | | Italy | A species of Alvania. |
| Alvania ameliae | Sp. nov | Valid | Chirli & Forli | Pleistocene | | Italy | A species of Alvania. |
| Alvania benestarensis | Sp. nov | Valid | Chirli & Forli | Miocene | | Italy | A species of Alvania. |
| Alvania cerreti | Sp. nov | Valid | Gardella et al. | Pliocene | | Italy | A species of Alvania. |
| Alvania pluricosticillata | Sp. nov | Disputed | Chirli & Forli | Plio-Pleistocene | | Italy | Originally described as a species of Alvania. Argued to be a junior synonym of the extant taxon Crisilla gagliniae by Amati & Oliverio (2024). |
| Amaea (Confusiscala) paleocaenica | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Ammonicera danieli | Sp. nov | Valid | Chernyshev & Goedert | Late Eocene/early Oligocene | Gries Ranch Formation | United States ( Washington) | A species of Ammonicera. |
| Ammonicera rolani | Sp. nov | Valid | Chernyshev & Goedert | Late Eocene/early Oligocene | Gries Ranch Formation | United States ( Washington) | A species of Ammonicera. |
| Ampezzogyra angulata | Sp. nov | Valid | Nützel & Hausmann in Hausmann et al. | Late Triassic (Carnian) | San Cassiano Formation | Italy | A member of the family Stuoraxidae. |
| Amphidromus ubaldii | Sp. nov | Valid | Dharma | Late Pliocene | | Indonesia | A species of Amphidromus. |
| Amplitomaria | Gen. et comb. nov | Valid | Karapunar & Nützel | | | | A member of Pleurotomariida. The type species is "Pleurotomaria" spuria Münster (1841). |
| Anacithara akisi | Sp. nov | Valid | Kolokotronis | Pliocene | | Cyprus | A species of Anacithara. |
| Anceps siminescui | Nom. nov | Valid | Harzhauser | Middle-late Miocene | | Moldova | A Trochidae member; a replacement name for Trochus semistriatus Siminescu & Barbu (1940). |
| Angulatella | Gen. et sp. nov | Valid | Nützel & Hausmann in Hausmann et al. | Late Triassic (Carnian) | San Cassiano Formation | Italy | A member of the family Prostyliferidae. The type species is A. bizzarinii. |
| Antithala | Gen. et comb. et 2 sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Bosnia and Herzegovina  Hungary  Poland  Romania  Ukraine | A member of the family Costellariidae. The type species is "Mitra" sturi Hoernes & Auinger (1880); genus also includes "Mitra" neugeboreni Hoernes & Auinger (1880), as well as new species A. claviformis and A. filipescui. |
| Apiocypraea cerretensis | Sp. nov | Valid | Fehse et al. | Pliocene (Zanclean) | | Italy | A member of the family Eocypraeidae. |
| Aplus abessensis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Aplus. |
| Aplus grandiculus | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Aplus. |
| Aplus littoralis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Aplus. |
| Aplus pseudoaquitanensis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Aplus. |
| Aquilofusus? antiqua | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Ascheria canni | Sp. nov | Valid | Kaim et al. | Late Cretaceous (Cenomanian to Turonian) | | Cyprus | A member of the family Hokkaidoconchidae. |
| Asiaharpa | Gen. et sp. nov | Valid | Raven | Miocene | | Malaysia | A member of the family Harpidae. Genus includes new species A. sarawakiana. |
| Attenuata? danica | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Possibly a species of Attenuata. |
| Auingeria | Gen. et comb. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria  Czech Republic  Germany  Hungary | A member of the family Columbellidae. The type species is "Columbella" bellardii Hörnes (1852); genus also includes "Columbella (Anachis)" austriaca Hoernes & Auinger (1880) and "Pyrene (Anachis) bellardii" grussbachensis Csepreghy-Meznerics (1969; raised to the rank of a separate species Auingeria grussbachensis). |
| Axonella | Gen. et comb. et sp. nov | Valid | Pacaud, Lhomme & Renaud | Eocene (Ypresian) | | France  Spain | A member of the family Hemisinidae. The type species is "Cerithium" palense Rouault (1850); genus also includes "Potamides" granosus Doncieux (1908), as well as new species A. falsiacum. |
| Babylonia chattica | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Babylonia. |
| Babylonia edigittenbergeri | Sp. nov | Valid | Raven | Miocene | Miri Formation | Malaysia | A species of Babylonia. |
| Babylonia sarawakiana | Sp. nov | Valid | Raven | Miocene | Miri Formation | Malaysia | A species of Babylonia. |
| Bandellina compacta | Sp. nov | Valid | Nützel & Hausmann in Hausmann et al. | Late Triassic (Carnian) | San Cassiano Formation | Italy | A member of the family Cornirostridae. |
| Barycypraea abbasi | Sp. nov | Valid | Dovesi & Parsons | Miocene (Serravallian) | Nyalindung Formation | Indonesia | A species of Barycypraea. |
| Barycypraea alessandrodovesi | Sp. nov | Valid | Dovesi & Parsons | Miocene (Serravallian) | Nyalindung Formation | Indonesia | A species of Barycypraea. |
| Bela pediensis | Sp. nov | Valid | Kolokotronis | Pliocene | | Cyprus | A species of Bela. |
| Bellacolumbella | Gen. et comb. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria  Czech Republic  Hungary  Romania | A member of the family Columbellidae. The type species is "Columbella (Nitidella)" karreri Hoernes & Auinger (1880); genus also includes "Columbella (Nitidella)" embryonalis Boettger (1902) and "Columbella (Nitidella)" katharinae Hoernes & Auinger (1880). |
| Bellardithala | Nom. et 4 sp. nov | Valid | Harzhauser & Landau | Miocene and Pliocene | Baden Formation Dej Formation | Austria  Czech Republic  Italy  Poland  Romania  Ukraine  Hungary? | A member of the family Costellariidae; a replacement name for Micromitra Bellardi (1888). The type species is "Voluta" obsoleta Brocchi (1814); genus also includes new species B. kovaci, B. baluki, B. fedosovi and B. dacica. |
| Bieleraxis | Gen. et 2 sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species B. discoidea and B. altis. |
| Bithynia disregularis | Sp. nov | In press | Li et al. | Oligocene | Yehucheng Formation | China | A species of Bithynia. |
| Bithynia obliquus | Sp. nov | In press | Li et al. | Oligocene | Yehucheng Formation | China | A species of Bithynia. |
| Bithynia parainclinimarga | Sp. nov | In press | Li et al. | Oligocene | Yehucheng Formation | China | A species of Bithynia. |
| Bithynia paramonolithic | Sp. nov | In press | Li et al. | Oligocene | Yehucheng Formation | China | A species of Bithynia. |
| Bittium prekoeneni | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Bittium. |
| Bulimulus frenguellii | Sp. nov | Valid | Cabrera et al. | Late Cretaceous | Queguay Formation | Uruguay | A species of Bulimulus. |
| Burminella | Gen. et sp. nov | In press | Balashov, Perkovsky & Vasilenko | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A land snail possessing morphological traits intermediate between members of the family Pupinidae and other members of Cyclophoroidea. Genus includes new species B. artiukhini. |
| Bursa transeuntis | Sp. nov | Valid | Forli & Smriglio | Miocene and Pliocene | | Hungary  Italy  Poland | A species of Bursa. |
| Caecum texanum | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Caecum. |
| Califrapana | Gen. et comb. nov | Valid | Powell & Houart | Late Oligocene to early Miocene | Vaqueros Formation | Mexico  United States ( California) | A member of the family Muricidae. The type species is "Purpura" vaquerosensis Arnold (1907). |
| Calyptraphorus velusus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Camponaxis bandeli | Sp. nov | Valid | Pieroni, Monari & Todd | Late Triassic (Carnian) | San Cassiano Formation | Italy | A Tofanellidae member |
| Campylacrum texanum | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Canariella (Majorata) gerti | Sp. nov | Valid | Groh | Quaternary | | Canary Islands | A species of Canariella. |
| Cancellotomaria | Gen. et comb. nov | Valid | Karapunar & Nützel | | | | A member of Pleurotomariida. The type species is "Pleurotomaria" subcancellata d'Orbigny (1850). |
| Cancilla nanostriatula | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria  Bulgaria  Hungary | A species of Cancilla. |
| Cancilla wagreichi | Sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Romania | A species of Cancilla. |
| Capulus gelus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Capulus. |
| Cassis kalmani | Sp. nov | Valid | Vicián & Kovács | Eocene (Lutetian) | Csernye Formation | Hungary | A species of Cassis. |
| Cassis rasae | Sp. nov | Valid | Petuch & Berschauer | Pleistocene | | United States ( Florida) | A species of Cassis. |
| Cassis viliusi | Sp. nov | Valid | Petuch & Berschauer | Pleistocene | | United States ( Florida) | A species of Cassis. |
| Cenorhytis | Gen. et sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species C. groesbecki. |
| Ceratopea? moridunensis | Sp. nov | Valid | Ebbestad & Cope | Ordovician (Floian) | | United Kingdom | A member of the family Raphistomatidae. |
| Cerithiella acuta | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Cerithiella. |
| Cerithiscala parvibrazosa | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Cerithiscala tehuacana | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Chemnitzia silvai | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Chemnitzia. |
| Chevallieria texanopsis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Chicomurex parvus | Sp. nov | Valid | Merle, Landau & Breitenberger | Miocene | | Indonesia | A species of Chicomurex. |
| Chicoreus javanus | Sp. nov | Valid | Merle, Landau & Breitenberger | Miocene | | Indonesia | A species of Chicoreus. |
| Chicoreus martini | Sp. nov | Valid | Merle, Landau & Breitenberger | Miocene | | Indonesia | A species of Chicoreus. |
| Chicoreus solidus | Sp. nov | Valid | Merle, Landau & Breitenberger | Miocene | | Indonesia | A species of Chicoreus. |
| Clava (Semivertagus) scriba | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Clavatula hirmetzli | Sp. nov | Valid | Kovács & Vicián | Middle Miocene | Lajta Limestone Formation | Hungary | A species of Clavatula. |
| Clavatula santhai | Sp. nov | Valid | Kovács & Vicián | Middle Miocene | Lajta Limestone Formation | Hungary | A species of Clavatula. |
| Clavatula szekelyhidiae | Sp. nov | Valid | Kovács & Vicián | Middle Miocene | Lajta Limestone Formation | Hungary | A species of Clavatula. |
| Cochlespira (Tahusyrinx) laevis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Cochlespira. |
| Conilithes herodus | Sp. nov | Valid | Psarras, Koskeridou & Merle | Miocene (Tortonian) | | Greece | A species of Conilithes. |
| Conradconfusus nodulinus | Sp. nov | Valid | Garvie | Eocene | Cook Mountain Formation | United States ( Texas) | |
| Conradconfusus texanus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Conus (Kalloconus) asterousiaensis | Sp. nov | Valid | Psarras, Koskeridou & Merle | Miocene (Tortonian) | | Greece  Italy | A species of Conus. |
| Conus (Kalloconus) helladicus | Sp. nov | Valid | Psarras, Koskeridou & Merle | Miocene (Tortonian) | | Greece | A species of Conus. |
| Cordieria biouesensis | Sp. nov | Valid | Pacaud | Paleocene (Thanetian) | | France | A species of Cordieria. |
| Coronia argilla | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Costoanachis venzoi | Nom. nov | Valid | Harzhauser & Landau | Miocene | | Italy | A species of Costoanachis; a replacement name for Anachis (Costoanachis) subcorrugata Venzo & Pelosio (1963). |
| Crassaseila | Gen. et 2 sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species C. ripleyana and C. paleocenica. |
| Crassispira plioibericostricta | Sp. nov | Valid | Brunetti & Forli | Pliocene (Zanclean) | | Spain | A species of Crassispira. |
| Crassispira pseudoglabra | Sp. nov | Valid | Brunetti & Forli | Pliocene (Piacenzian) | | Italy | A species of Crassispira. |
| Crenaturricula minuta | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Creonella hebetertia | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Cretatortulosa cretakachinensis | Sp. nov | In press | Yu, Salvador & Jarzembowski | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | |
| Cretatortulosa gignens | Sp. nov | In press | Jochum, Yu & Neubauer | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A member of the family Pupinidae. |
| Cryptochorda paleocaenica | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Cyathopoma pingyiensis | Sp. nov | In press | Yu et al. | Cretaceous–Paleogene transition | Pingyi Basin | China | A species of Cyathopoma. |
| Cylichna (Cylichnopsis) elliptica | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Cylichna. |
| Cymatiella dulaii | Sp. nov | Valid | Vicián & Kovács | Eocene (Lutetian) | Csernye Formation | Hungary | A species of Cymatiella. |
| Cymatiella tzankovi | Nom. nov | Valid | Vicián & Kovács | Paleocene | | Bulgaria | A species of Cymatiella; a replacement name for Eutritonium (Sassia) rutoti Tzankov (1940). |
| Cymatium danianum | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Cymatium. |
| Cyphoma guraboensis | Sp. nov | Valid | Groves & Landau | Early Pliocene | Gurabo Formation | Dominican Republic | A species of Cyphoma. |
| Cypraeorbis alisonkayae | Sp. nov | Valid | Groves & Landau | Miocene | | Dominican Republic | A species of Cypraeorbis. |
| Cyprioconcha | Gen. et sp. nov | Valid | Kaim et al. | Late Cretaceous (Cenomanian to Turonian) | | Cyprus | A member of the family Hokkaidoconchidae. The type species is C. robertsoni. |
| Defensina | Gen. et comb. nov | Valid | Harzhauser & Landau | Miocene | | Bosnia and Herzegovina  Bulgaria  Romania | A member of the family Columbellidae. The type species is "Columbella (Mitrella)" bucciniformis Hoernes & Auinger (1880). |
| Dermomurex wanneri | Nom. nov | Valid | Merle, Landau & Breitenberger | Miocene | | Indonesia | A species of Dermomurex; a replacement name for Murex acuticostatus Wanner & Hahn (1935). |
| Desbruyeresia kambiaensis | Sp. nov | Valid | Kaim et al. | Late Cretaceous (Cenomanian to Turonian) | | Cyprus | A species of Desbruyeresia. |
| Desbruyeresia kinousaensis | Sp. nov | Valid | Kaim et al. | Late Cretaceous (Cenomanian to Turonian) | | Cyprus | A species of Desbruyeresia. |
| Desbruyeresia memiensis | Sp. nov | Valid | Kaim et al. | Late Cretaceous (Cenomanian to Turonian) | | Cyprus | A species of Desbruyeresia. |
| Discotectonica paracutissima | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Discotectonica. |
| Doliella parnitens | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Doliella. |
| Domiporta amoena | Sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Austria  Bulgaria  Romania | A species of Domiporta. |
| Domiporta pulchra | Sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Romania | A species of Domiporta. |
| Domiporta turpis | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria | A species of Domiporta. |
| Ederazyga | Gen. et sp. et comb. nov | Valid | Pieroni, Monari & Todd | Late Triassic (Carnian to Rhaetian) | Nayband Formation San Cassiano Formation Zu Limestone | Iran  Italy  Slovenia | A possible Zygopleuridae member. The type species is E. fanchini; genus also includes "Cerithium"? lateplicatum Klipstein (1843). |
| Ellobium mizutanii | Sp. nov | Valid | Kawase & Ichihara | Early Miocene | Akeyo Formation | Japan | A species of Ellobium. |
| Entemnotrochus kathiawarensis | Sp. nov | Valid | Bose, Das & Mondal | Miocene (Burdigalian) | | India | A species of Entemnotrochus. |
| Eoacteon paracutissima | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Eoancilla lapicidina | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Eocithara (?) laurencei | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Eopleurotoma atacica | Nom. nov | Valid | Pacaud | Eocene (Ypresian) | | France | A species of Eopleurotoma; a replacement name for Pleurotoma (Eopleurotoma) romani Doncieux (1908). |
| Eotrivia pacaudi | Sp. nov | Valid | Fehse | Eocene | | Italy | |
| Eoturris fallsensis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Eoworthenia frydai | Nom. nov | Valid | Karapunar & Nützel | | | | A member of Pleurotomariida; a replacement name for Worthenia rarissima Barrande. |
| Episcomitra antibellardii | Sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Romania | A species of Episcomitra. |
| Episcomitra leopoldiana | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria  Czech Republic  Poland | A species of Episcomitra. |
| Episcomitra missile | Sp. nov | Valid | Harzhauser & Landau | Miocene | Grund Formation | Austria  Hungary | A species of Episcomitra. |
| Episcomitra neubaueri | Sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Romania | A species of Episcomitra. |
| Episcomitra pontonxensis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Episcomitra. |
| Episcomitra pseudoincognita | Sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Romania  Ukraine | A species of Episcomitra. |
| Episcomitra vermeuleni | Sp. nov | Valid | Pacaud | Eocene (Priabonian) | | Ukraine | A species of Episcomitra. |
| Eulimella ariejansseni | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Eulimella. |
| Euthema myanmarica | Sp. nov | Valid | Balashov | Cretaceous | Hkamti amber | Myanmar | A species of Euthema. |
| Euthria mellianensis | Sp. nov | Valid | Lozouet | Miocene | | France | A species of Euthria. |
| Euthria tarusatensis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Euthria. |
| Euthriofusus argillensis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | |
| Falsifusus problematicus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Fedosovia | Gen. et comb. nov | Valid | Harzhauser & Landau | Miocene | | Czech Republic  Italy  Romania | A member of the family Costellariidae. The type species is "Mitra (Callithea)" fuchsi Hoernes & Auinger (1880). |
| Fraudiziba | Gen. et nom. et sp. nov | Valid | Harzhauser & Landau | Miocene and Pliocene | Karaman Basin | Austria  Bosnia and Herzegovina  Czech Republic  Hungary  Italy  Poland  Romania  Slovakia  Turkey  Ukraine | A member of the family Mitridae. The type species is F. paratethyca (a replacement name for Mitra austriaca Csepreghy-Meznerics, 1950); genus also includes new species F. ottomanica. |
| Fulgurofusus spinosus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Fulgurofusus. |
| Fusulculus texanus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Fusulculus. |
| Galba prima | Sp. nov | Valid | Yu, Neubauer & Jochum | Cretaceous | Burmese amber | Myanmar | A species of Galba. |
| Gemmula bearrizensis | Nom. nov | Valid | Pacaud | Eocene (Priabonian) | | France | A species of Gemmula; a replacement name for Drillia pellati Boussac (1911). |
| Gemmula osca | Sp. nov | Valid | Pacaud | Eocene (Bartonian) | | Spain | A species of Gemmula. |
| Gentilifulgur | Gen. et sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species G. praemortoni. |
| Gibbula lovellreevei | Nom. nov | Valid | Harzhauser | Pliocene | | United Kingdom | A Trochidae member; a replacement name for Trochus (Gibbula) reevei Harmer (1923). |
| Gibbula pizzolatoi | Sp. nov | Valid | Spadini | Pliocene | | Italy | A species of Gibbula. |
| Gibbula steiningeri | Nom. nov | Valid | Harzhauser | Early Miocene | | Austria | A Trochidae member; a replacement name for Trochus amedei bicincta Schaffer (1912). |
| Gibbula tavanii | Nom. nov | Valid | Harzhauser | Miocene | | Libya | A Trochidae member; a replacement name for Gibbula minima Tavani (1939). |
| Gibbuliculus | Gen. et comb. et nom. nov | Valid | Harzhauser | Oligocene to Pleistocene | | Europe | A Trochidae member; The type species is "Gibbula" brebioni Landau, Van Dingenen & Ceulemans (2017). Genus includes G. saccoi (a replacement name for Gibbula protumida Sacco, 1896). |
| "Gibbulinella" sandbergeri | Nom. nov | Valid | Harzhauser & Neubauer | Eocene | | Italy | A member of the family Streptaxidae; a replacement name for Pupa simplex Sandberger (1870). |
| Haedropleura dellabellai | Sp. nov | Valid | Brunetti & Cresti | Pliocene | | Italy | A species of Haedropleura. |
| Hammatospira cancellata | Sp. nov | Valid | Mazaev | Early Carboniferous | | Kazakhstan | |
| Hespererato canae | Sp. nov | Valid | Groves & Landau | Late Miocene and early Pliocene | Cercado Formation | Dominican Republic | A species of Hespererato. |
| Hespererato praeclusa | Sp. nov | Valid | Groves & Landau | Early–middle Miocene | Baitoa Formation | Dominican Republic | A species of Hespererato. |
| Hexaplex nascium | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Hexaplex. |
| Hirsuticyclus canaliculatus | Sp. nov | In press | Yu | Cretaceous | Burmese amber | Myanmar | A member of the family Cyclophoridae. |
| Hochheimia | Nom. nov | Valid | Harzhauser & Neubauer | Oligocene | | Germany | A member of the family Hygromiidae; a replacement name for Palaeotrichia Nordsieck (2014). |
| Hokkaidoconcha morisseaui | Sp. nov | Valid | Kaim et al. | Late Cretaceous (Cenomanian to Turonian) | | Cyprus | A member of the family Hokkaidoconchidae. |
| Holospira? fallsensis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Possibly a species of Holospira. |
| ?Hydrocena praecursor | Sp. nov | In press | Yu & Neubauer | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A member of the family Hydrocenidae. |
| Jponsia lacetania | Sp. nov | Valid | Pacaud & Goret | Eocene (Ypresian) | | Spain | A member of the family Pachychilidae. |
| Kapalmerella gelus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Keepingia elongata | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | |
| Laevispira | Gen. et comb. et sp. nov | Valid | Raven | Miocene and Pliocene | | Brunei  India  Indonesia | A member of the family Strombidae. Genus includes "Dolomena" bruneiensis Harzhauser, Raven & Landau (2018), "Strombus" glaber Martin (1879), "Strombus" karikalensis Cossmann (1903), "Strombus" triangulatus Martin (1879) and "Strombus" varinginensis Martin (1899), as well as new species L. seriaensis. |
| Laevitrivia | Gen. et comb. et 5 sp. nov | Valid | Fehse & Vicián | Miocene and Pliocene | | France  Italy | A member of the family Triviidae. The type species is "Cypraea" pisolina Lamarck, (1810); genus also includes new species L. annae, L. bertaccinii, L. pliopisolina, L. pseudocalva and L. ventricostata. |
| Latirus? asperpellis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Possibly a species of Latirus. |
| Laubella subsulcata | Sp. nov | Valid | Karapunar & Nützel | Late Triassic | San Cassiano Formation | Italy | A member of Pleurotomariida. |
| Lineacingulum | Gen. et comb. nov | Valid | Karapunar & Nützel | | | | A member of Pleurotomariida. The type species is "Pleurotomaria" texturata Münster (1841). |
| Lineaetomaria | Gen. et comb. nov | Valid | Karapunar & Nützel | | | | A member of Pleurotomariida. The type species is "Pleurotomaria" decorata Münster (1841). |
| Liostomia wilvanderstoelae | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Liostomia. |
| Littorina elongata | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Littorina. |
| Littorina (Prosthenodon) incertus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Littorina. |
| Lupira danianum | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Lutema gracilis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Lyria elongata | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Lyria. |
| Lyria tehuacana | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Lyria. |
| Malea hyaducki | Sp. nov | Valid | Petuch & Berschauer | Pliocene | | United States ( Florida) | A species of Malea. |
| Martaia | Gen. et comb. nov | Valid | Harzhauser & Landau | Miocene | | Austria  Bulgaria  Czech Republic  Hungary  Romania  Ukraine | A member of the family Columbellidae. The type species is "Columbella (Anachis)" dujardini Hoernes & Auinger (1880); genus also includes "Columbella (Anachis)" zitteli Hoernes & Auinger (1880). |
| Mathilda (Echinimathilda) duogenta | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Mathilda. |
| Melongena pontonxensis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Melongena. |
| Metula bulbiformis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Metula. |
| Metula nana | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Metula. |
| Metula pseudomajor | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Metula. |
| Metula rivulisensis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Metula. |
| Mimospira llangynogensis | Sp. nov | Valid | Ebbestad & Cope | Ordovician (Floian) | | United Kingdom | A member of the family Clisospiridae. |
| Mitrella dacica | Sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Hungary  Romania  Slovakia | A species of Mitrella. |
| Mitrella demaintenonae | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation Dej Formation | Austria  Romania | A species of Mitrella. |
| Mitrella elongatissima | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria  Bosnia and Herzegovina | A species of Mitrella. |
| Mitrella fortis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Mitrella. |
| Mitrella tarbelliana | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Mitrella. |
| Mitrella viennensis | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria  Bulgaria  Czech Republic  Kazakhstan  Poland  Romania | A species of Mitrella. |
| Moniquia astibiai | Sp. nov | Valid | Pacaud & Goret | Eocene (Priabonian) | | Spain | A member of the family Pachychilidae. |
| Monoplex s.l. szakonyii | Sp. nov | Valid | Vicián & Kovács | Eocene (Lutetian) | Csernye Formation | Hungary | A member of the family Cymatiidae. |
| Mulderia mulderi | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A member of the family Pyramidellidae. |
| Multitrochia | Gen. et sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species M. tehuacana. |
| Nannamoria alquezae | Sp. nov | Valid | Hawke | Miocene | | Australia | A species of Nannamoria. |
| Nannamoria cadella | Sp. nov | Valid | Hawke | Miocene | Cadel Formation | Australia | A species of Nannamoria. |
| Nannamoria costatum | Sp. nov | Valid | Hawke | Pliocene | Cameron Inlet Formation | Australia | A species of Nannamoria. |
| Nannamoria flindersi | Sp. nov | Valid | Hawke | Pliocene | Cameron Inlet Formation | Australia | A species of Nannamoria. |
| Nannamoria gnotuki | Sp. nov | Valid | Hawke | | | Australia | A species of Nannamoria. |
| Nannamoria hiscocki | Sp. nov | Valid | Hawke | Pliocene | Cameron Inlet Formation | Australia | A species of Nannamoria. |
| Nannamoria malonei | Sp. nov | Valid | Hawke | | | Australia | A species of Nannamoria. |
| Nannamoria persimilis | Sp. nov | Valid | Hawke | Miocene | | Australia | A species of Nannamoria. |
| Naria praehelvola | Sp. nov | Valid | Fehse & Vicián | Miocene | | Indonesia | A species of Naria. |
| Natica (Carinacca) kincaidensis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Natica. |
| Nebularia soliphila | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria | A species of Nebularia. |
| Nemaspira | Gen. et comb. et 2 sp. nov | Valid | Mazaev | Early Carboniferous to Late Triassic | | Belgium  Russia  Thailand  United Kingdom  United States  China? | A member of the family Gosseletinidae. Genus includes several species formerly assigned to the genera Gosseletina and Globodoma, as well as new species N. shamaevi and N. skuini. |
| Nitidiclavus senesi | Sp. nov | Valid | Biskupič | Miocene | | Slovakia | A member of the family Drilliidae. |
| Niveria callosa | Sp. nov | Valid | Fehse | Late Oligocene | | France | A species of Niveria. |
| Niveria novosperara | Sp. nov | Valid | Fehse | Late Oligocene | | France | A species of Niveria. |
| Nodocingulum | Gen. et comb. et 2 sp. nov | Valid | Karapunar & Nützel | Late Triassic | San Cassiano Formation | Italy | A member of Pleurotomariida. The type species is "Pleurotomaria" coronata Münster (1841); genus also includes new species N. ernstkittli and possibly also N? turris. |
| Nodolargena | Gen. et sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A member of the new family Nodolargenidae. Genus includes new species N. frosti. |
| Nodovoluta | Gen. et sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species N. coronata. |
| Odostomia malagensis | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Odostomia. |
| Oligonalia | Gen. et comb. nov | Valid | Lozouet | Oligocene | | France | A new genus for "Siphonalia" riparia Lozouet (1999). |
| Olinderia | Gen. et comb. et 3 sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A member of the family Charitodoronidae. The type species is "Charitodoron" tauzini Lozouet (1991); genus also includes new species O. lestrillensis, O. poustagnacensis and O. verdunensis. |
| Olivella tehuacanensis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Olivella. |
| Ondina pinguis | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Ondina. |
| Onustus undosus | Sp. nov | Valid | Raven | Miocene | | Brunei | A species of Onustus. |
| Opalia tehuacana | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Opalia. |
| Orbitestella kieli | Sp. nov | Valid | Chernyshev & Goedert | Late Eocene/early Oligocene | Gries Ranch Formation | United States ( Washington) | A member of the family Orbitestellidae. |
| Orthosurcula ethani | Sp. nov | Valid | Garvie | Eocene | Cook Mountain Formation | United States ( Texas) | |
| Oxyacrum gracilis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Pagonia | Gen. et sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species P. spiralis. |
| Palaeorhaphis? laevis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Paleofusus | Gen. et 3 sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species P. bellus, P. parvicrassus and P. elegantissima. |
| Papuliscala? acus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Possibly a species of Papuliscala. |
| Papuliscala keani | Sp. nov | Valid | Garvie | Eocene | Cook Mountain Formation | United States ( Texas) | |
| Parasassia vargai | Sp. nov | Valid | Vicián & Kovács | Eocene (Lutetian) | Csernye Formation | Hungary | A member of the family Cymatiidae. |
| Parthenina pacaudi | Nom. nov | Valid | Landau & Micali | Miocene | | France | A species of Parthenina; a replacement name for Pyrgulina (Parthenina) dollfusi Cossmann (1921). |
| Parvisipho? spiralis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Paskentana dixoni | Sp. nov | Valid | Kaim et al. | Late Cretaceous (Cenomanian to Turonian) | | Cyprus | A member of Abyssochrysoidea belonging to the family Paskentanidae. |
| Paskentana xenophontosi | Sp. nov | Valid | Kaim et al. | Late Cretaceous (Cenomanian to Turonian) | | Cyprus | A member of Abyssochrysoidea belonging to the family Paskentanidae. |
| Perotrochus bermotiensis | Sp. nov | Valid | Bose, Das & Mondal | Oligocene | | India | A species of Perotrochus. |
| Perrona harzhauseri | Sp. nov | Valid | Kovács & Vicián | Middle Miocene | Lajta Limestone Formation | Hungary | A species of Perrona. |
| Perrona nemethi | Sp. nov | Valid | Kovács & Vicián | Middle Miocene | Lajta Limestone Formation | Hungary | A species of Perrona. |
| Personopsis merlei | Sp. nov | Valid | Vicián & Kovács | Eocene (Lutetian) | Csernye Formation | Hungary | A species of Personopsis. |
| Pfefferiola | Nom. nov | Valid | Harzhauser & Neubauer | Eocene | | Italy | A member of the family Streptaxidae; a replacement name for Oppenheimiella Pfeffer (1930). |
| Phos estotiensis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Phos. |
| Pleurotomella irminonvilla | Nom. nov | Valid | Pacaud | Eocene (Bartonian) | | France | A species of Pleurotomella; a replacement name for Pleurotomella cossmanni Morellet & Morellet (1946). |
| Pliciscala obliqua | Sp. nov | Valid | Garvie | Eocene | Cook Mountain Formation | United States ( Texas) | |
| Poirieria (Paziella) delera | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Polinices tehuacana | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Polinices. |
| Popenoeum tabulatum | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Pressulasphaera | Gen. et comb. nov | Valid | Karapunar & Nützel | | | | A member of Pleurotomariida. The type species is "Pleurotomaria" pamphilus d'Orbigny (1850). |
| Priscoficus johnfoxi | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Priscoficus nodulina | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Proceraedis | Gen. et 2 sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species P. imbricataria and P. tegumenis. |
| Prososthenia esuegirottii | Sp. nov | Valid | Dominici & Forli | Pliocene (Zanclean) | | Italy | A member of the family Hydrobiidae. |
| Protoplex? zsoldosi | Sp. nov | Valid | Vicián & Kovács | Eocene (Lutetian) | Csernye Formation | Hungary | A member of the family Cymatiidae. |
| Proviviparus | Gen. et sp. nov | Valid | Frese & Ponder | Late Jurassic | Talbragar Fish Bed | Australia | A member of the family Viviparidae. Genus includes new species P. talbragarensis |
| Pseudoananias | Gen. et comb. nov | Valid | Karapunar & Nützel | | | | A member of Pleurotomariida. The type species is "Pleurotomaria" subgranulata Münster (1841). |
| Pseudokatosira uhlhingleyorum | Sp. nov | Valid | Gründel, Davies & Simonsen | Early Jurassic (Pliensbachian) | | | |
| Pseudolatirus acuelatus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Pseudolatirus. |
| Pseudolatirus boettgeri | Nom. nov | Valid | Kovács | Miocene | | Romania | A member of the family Fasciolariidae; a replacement name for Fusus sublamellosus Boettger (1906). Originally described as a species of Pseudolatirus; Harzhauser, Landau & Vermeij (2024) tentatively placed it in the genus Takashius. |
| Pseudosassia | Gen. et comb. et 2 sp. nov | Valid | Vicián & Kovács | Paleocene–Miocene | | Austria  Belgium  Bulgaria  Czech Republic  Denmark  France  Germany  Hungary  Italy  Netherlands  Poland  Romania  Serbia  Slovakia  Turkey  Ukraine  United Kingdom | A member of the family Cymatiidae. The type species is "Triton" flandricum Koninck (1838); genus also includes new species P. gurdoni and P. traceyi. |
| Pseudoterebellum | Gen. et comb. nov | Valid | Maxwell, Rymer & Congdon | Eocene | Ghazij Shales | Indonesia  Pakistan  Saudi Arabia | A member of the family Seraphsidae. The type species is "Terebellum" diversiornatum Eames (1952); genus also includes "Terebellum" saudiensis Abbass (1972) and "Terebellum" olympiae Rolando (2001). |
| Ptychatractus cataractus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Ptychatractus. |
| Pulchraspira | Gen. et sp. nov | In press | Yu, Salvador & Jarzembowski | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | Genus includes new species P. teneristoma. |
| Puposyrnola? confusa | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Possibly a species of Puposyrnola. |
| Puposyrnola multibaca | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Puposyrnola. |
| Puposyrnola obliqua | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Puposyrnola. |
| Puposyrnola shirleyae | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Puposyrnola. |
| Pusia aturensis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Pusia. |
| Pusia confunda | Sp. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Romania | A species of Pusia. |
| Pusia? falsitranssylvanica | Nom. nov | Valid | Harzhauser & Landau | Miocene | Dej Formation | Romania | Possibly a species of Pusia; a replacement name for Mitra (Costellaria) recticosta var. transsylvanica Boettger (1902). |
| Pusia subpyrenaica | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Pusia. |
| Pusia virodunensis | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Pusia. |
| Pustularia korneli | Sp. nov | Valid | Fehse & Vicián | Miocene | | Indonesia | A species of Pustularia. |
| Pyrgiscus elegans | Sp. nov | Valid | Tabanelli et al. | Pliocene | | Italy | A species of Pyrgiscus. |
| Pyrgiscus jaapmulderi | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Pyrgiscus. |
| Pyrgulina marliesae | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Pyrgulina. |
| Retusa (Cylichnina) praemoryi | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Retusa. |
| Rhaphaulus zhuoi | Sp. nov | In press | Yu, Salvador & Jarzembowski | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | |
| Rinaldoella tornata | Sp. nov | Valid | Karapunar & Nützel | Late Triassic | San Cassiano Formation | Italy | A member of Pleurotomariida. |
| Ringicula taenia | Sp. nov | Valid | Garvie | Eocene | Cook Mountain Formation | United States ( Texas) | A species of Ringicula. |
| Sansonia texana | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Sassella | Gen. et 2 sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species S. mixta and S. frosti. |
| Scalptia nemethi | Sp. nov | Valid | Kovács & Vicián | Miocene | Lajta Formation | Hungary | A species of Scalptia. |
| Scaphella kendrae | Sp. nov | Valid | Petuch & Berschauer | Pliocene (Zanclean) | Murdock Formation | United States ( Florida) | A species of Scaphella. |
| Schizogonium undae | Sp. nov | Valid | Karapunar & Nützel | Late Triassic | San Cassiano Formation | Italy | A member of Pleurotomariida. |
| Seraphs kaindraperi | Sp. nov | Valid | Maxwell, Rymer & Congdon | Eocene (Priabonian) | | Jamaica | A member of the family Seraphsidae. |
| Similalvania | Gen. et comb. nov | Valid | Chirli & Forli | Pliocene | | Italy | A member of the family Rissoidae. The type species is "Alvania" magistra Chirli (2006) |
| Solariella microstriata | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Solariella. |
| Solariorbis planulatis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Squamoworthenia | Gen. et comb. nov | Valid | Mazaev | Carboniferous | | Australia  Germany  Kazakhstan | Genus includes S. duponti (Holzapfel, 1889) and "Worthenia" crenilunula Yoo (1994). |
| Stellaria striatissima | Sp. nov | Valid | Raven | Miocene | | Malaysia | A species of Stellaria. |
| Striacingulum | Gen. et comb. nov | Valid | Karapunar & Nützel | | | | A member of Pleurotomariida. The type species is "Pleurotomaria" cancellatocingulata Klipstein (1844). |
| Striaticostatum figus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Stuckenbergispira dombarensis | Sp. nov | Valid | Mazaev | Early Carboniferous | | Kazakhstan | |
| Sveltella novus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Sveltella. |
| Sveltia sofiae | Sp. nov | Valid | Landau & da Silva | Pliocene | | Portugal | A species of Sveltia. |
| Syrnola debrae | Sp. nov | Valid | Garvie | Eocene | Cook Mountain Formation | United States ( Texas) | A species of Syrnola. |
| Taioma? argilla | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Taioma calxa | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Taranis occulta | Sp. nov | Valid | Brunetti & Cresti | Pliocene | | Italy | A species of Taranis. |
| Teinostoma regularis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Teinostoma. |
| Terebellum humilispirum | Sp. nov | Valid | Raven | Miocene | | Malaysia | A species of Terebellum. |
| Terebra (Mirula) mexia | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Terebra. |
| Terebrifusus megahani | Sp. nov | Valid | Garvie | Eocene | Cook Mountain Formation | United States ( Texas) | |
| Thylacodes devriesi | Sp. nov | In press | Sanfilippo et al. | Miocene | | Peru | A species of Thylacodes. |
| Tornatellaea globosa | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Tornatellaea linifera | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Tripsycha strapplei | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Tritia miniridibunda | Sp. nov | Valid | Lozouet | Miocene | | France | A species of Tritia. |
| Tritia praebasteroti | Sp. nov | Valid | Lozouet | Oligocene (Chattian) | | France | A species of Tritia. |
| Tritiaria formosa | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Trivia disjuncta | Sp. nov | Valid | Fehse | Late Oligocene | | France | A species of Trivia. |
| Trivia simplex | Sp. nov | Valid | Fehse | Late Oligocene | | France | A species of Trivia. |
| Trona colossus | Sp. nov | Valid | Groves & Landau | Early–middle Miocene | Baitoa Formation | Dominican Republic | A species of Trona. |
| Truncatella jiaozhouensis | Sp. nov | In press | Yu et al. | Late Cretaceous | Jiaolai Basin | China | A species of Truncatella. |
| Tumidosipho | Gen. et sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | Genus includes new species T. tehuacana. |
| Turbo (Marmarostoma) ishidai | Sp. nov | Valid | Tomida, Sano & Kase | Miocene | Ena Limestone | Japan | A species of Turbo. |
| Turbonilla bincki | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Turbonilla. |
| Turbonilla bongiardinoi | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Turbonilla. |
| Turbonilla crovatoi | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Turbonilla. |
| Turbonilla malacitana | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Turbonilla. |
| Turbonilla mauroi | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Turbonilla. |
| Turbonilla plioalboranensis | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Turbonilla. |
| Turbonilla velerinensis | Sp. nov | Valid | Landau & Micali | Pliocene | | Spain | A species of Turbonilla. |
| Turricula frosti | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Turricula. |
| Turricula imbricata | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Turricula. |
| "Turritella" calax | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Umbilia furneauxensis | Sp. nov | Valid | Southgate, Militz & Roberts | Pliocene | | Australia | A species of Umbilia. |
| Unitas duomillias | Sp. nov | Valid | Garvie | Eocene | Cook Mountain Formation | United States ( Texas) | |
| Unitas euani | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Unitas petiti | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Valvata jiaolaiensis | Sp. nov | In press | Yu et al. | Late Cretaceous | Jiaolai Basin | China | A species of Valvata. |
| Vanikoropsis bashforthi | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Danian) | Agatdal Formation | Greenland | Possibly a member of the family Vanikoridae. |
| Vanikoropsis jakobseni | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Danian) | Agatdal Formation | Greenland | Possibly a member of the family Vanikoridae. |
| Vanikoropsis mortenseni | Sp. nov | Valid | Schnetler & Nielsen | Paleocene (Selandian) | Kerteminde Marl | Denmark | Possibly a member of the family Vanikoridae. |
| Varicospira bekenuensis | Sp. nov | Valid | Raven | Miocene | | Malaysia | A species of Varicospira. |
| Varicospira reticulata | Sp. nov | Valid | Raven | Miocene | | Malaysia | A species of Varicospira. |
| Vermicularia? columella | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Vexillum transalpinum | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria  Hungary  Romania  Turkey | A species of Vexillum. |
| Vitrinella discus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Vitrinella. |
| Vitrinella praelaevis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Vitrinella. |
| Volutifusus dougsheltoni | Sp. nov | Valid | Petuch & Berschauer | Pliocene (Piacenzian) | Tamiami Formation | United States ( Florida) | A species of Volutifusus. |
| Volutifusus kissimmeensis | Sp. nov | Valid | Petuch & Berschauer | Pliocene (Piacenzian) | Tamiami Formation | United States ( Florida) | A species of Volutifusus. |
| Volutomorpha ultima | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Wormsina | Gen. et comb. nov | Valid | Harzhauser & Landau | Miocene | | Romania | A member of the family Mitridae. The type species is "Mitra (Cylindra)" transsylvanica Hoernes & Auinger (1880). |
| Wortheniella klipsteini | Sp. nov | Valid | Karapunar & Nützel | Late Triassic | San Cassiano Formation | Italy | A member of Pleurotomariida. |
| Wortheniella paolofedelei | Sp. nov | Valid | Karapunar & Nützel | Late Triassic | San Cassiano Formation | Italy | A member of Pleurotomariida. |
| Zafrona sphaerocorrugata | Sp. nov | Valid | Harzhauser & Landau | Miocene | Baden Formation | Austria  Bosnia and Herzegovina  Bulgaria  Hungary  Romania  Ukraine | A species of Zafrona. |
| Zebinella tehuacana | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Zebinella. |
| Zonaria vokesae | Sp. nov | Valid | Groves & Landau | Early–middle Miocene | Baitoa Formation | Dominican Republic | A species of Zonaria. |

## Bivalves
### New taxa

| Name | Novelty | Status | Authors | Age | Type locality | Country | Notes |
| Acar beadata | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Acar. |
| Amphidonte mirkamalovi | Sp. nov | Valid | Metelkin & Kosenko | Early Cretaceous (Aptian) | | | An oyster. |
| Arcopsis subrhombus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Arcopsis tumulus | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Arkhanguelskya | Gen. et comb. nov | Valid | Cooper & Leanza | Cretaceous | | | A member of the family Buchotrigoniidae. Genus includes "Trigonia" weberi Arkhangelsky (1916). |
| Baluchicardia? eoplata | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Bengtsonigonia | Nom. nov | Valid | Ceccolini & Cianferoni | Early Cretaceous | Riachuelo Formation | Brazil | A replacement name for Bengtsonella Cooper & Leanza (2019). |
| Bohemigonia | Gen. et sp. et comb. nov | Valid | Cooper | | | Czech Republic | A member of the family Megatrigoniidae. The type species is B. frici; genus also includes "Trigonia" debuchii Geinitz (1840). |
| Caryocorbula? praefigera | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Chama ferrata | Sp. nov | Valid | Berezovsky | Eocene | | Ukraine | A species of Chama. |
| Chama subcalcarata | Sp. nov | Valid | Berezovsky | Eocene | | Ukraine | A species of Chama. |
| Corbulamella palaeocenica | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Crassatellina minuta | Sp. nov | Valid | Jaitly et al. | Late Cretaceous (Turonian) | Nodular Limestone Formation | India | A member of the family Lucinidae belonging to the subfamily Eriphylinae. |
| Crassatellina paleocaenica | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Cuspidaria texana | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Cuspidaria. |
| Diplodonta frosti | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Diplodonta paleocaenica | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Dorbigonia | Gen. et comb. nov | Valid | Cooper | Cretaceous | | France | A member of the family Megatrigoniidae. Genus includes "Trigonia" disparilis d'Orbigny (1844). |
| Elianegonia | Nom. nov | Valid | Ceccolini & Cianferoni | Late Cretaceous | | Madagascar | A replacement name for Elianella Cooper (2015). |
| Eomiltha strangensis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Eurydesma sacculum snapperensis | Ssp. nov | Valid | Waterhouse | Permian | Wandrawandian Formation | Australia | A bivalve belonging to the group Pectinida and the family Eurydesmidae. |
| Freneixicardia picturata | Sp. nov | Valid | Berezovsky | Eocene | | Ukraine | A cockle. |
| Frenguelliella eopacifica | Sp. nov | Valid | Echevarría, Damborenea & Manceñido | Early Jurassic | | Argentina | A member of Trigoniida belonging to the family Frenguelliellidae. |
| Glycymeris laevigata | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Glycymeris. |
| Grammatodon superstes | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Gregariella frosti | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Gregariella. |
| Himenourella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Japan  Russia | A member of the family Megatrigoniidae. Genus includes "Trigonia" jimbonis Strand (1928), "Trigonia" sawatai Yehara (1923), "Apiotrigonia" subjimboi Miroljubov in Vereshchagin et al. (1965) and "Trigonia" subovalis Jimbo (1894). |
| Kolymia rutskovi | Sp. nov | Valid | Biakov in Biakov et al. | Permian | | Russia | |
| Kushmurunskya | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Kazakhstan | A member of the family Megatrigoniidae. Genus includes "Trigonia" gladkowskii Shcheglova-Borodina (1960). |
| Kyzylkumgonia | Gen. et comb. nov | Valid | Cooper | Cretaceous | | | A member of the family Megatrigoniidae. Genus includes "Trigonia" syrdariensis Arkhangelsky (1916), "Trigonia" turcmenensis Arkhangelsky (1916) and "Megatrigonia" tagamensis Belyakova (1980). |
| Loxocardium marmoreum | Sp. nov | Valid | Berezovsky | Eocene | | Ukraine | A cockle. |
| Lucina crassiplica | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Lucina. |
| Lucina multivittae | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Lucina. |
| Lucina tehuacanensis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Lucina. |
| Maedagonia | Gen. et comb. et nom. nov | Valid | Cooper | Cretaceous | | Japan  Russia | A member of the family Megatrigoniidae. Genus includes "Apiotrigonia" mikasaensis Tashiro (1979), "Apiotrigonia" ashizawaensis Saito (1962), "Apiotrigonia" crassoradiata Nakano (1957), "Apiotrigonia" futabaensis Maeda & Kawabe (1967), "Apiotrigonia" hetonaiana Tashiro (1978), "Apiotrigonia" hironoensis Maeda & Kawabe (1967), "Apiotrigonia" jimboi Nakano (1957), "Apiotrigonia" obliquecostata Nakano (1957), "Apiotrigonia" obsoleta Nakano (1957), "Apiotrigonia" orikiensis Maeda & Kawabe (1967), "Apiotrigonia" undulosa Nakano (1957) and "Apiotrigonia" utoensis Tashiro (1972), as well as M. yabei (a replacement name for Trigonia subovalis var. minor Yabe & Nagao, 1925). |
| Martesia mazanticus | Sp. nov | Valid | Castañeda-Posadas, Trujillo-Hernández & Zúñiga-Mijangos | Miocene | Mexican amber | Mexico | A species of Martesia. |
| Matsudagonia | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Japan | A member of the family Megatrigoniidae. Genus includes "Apiotrigonia" dubia Tashiro (1979). |
| Moerickella | Gen. nov | Valid | Echevarría, Damborenea & Manceñido | Early Jurassic | | Argentina | A member of Trigoniida, most likely the oldest member of the family Myophorellidae. |
| Naiadites devonicus | Sp. nov | Valid | Scholze & Gess | Devonian (Famennian) | Witpoort Formation | South Africa | |
| Opis reticulata | Sp. nov | Valid | Jaitly et al. | Late Cretaceous (Turonian) | Nodular Limestone Formation | India | A member of the family Lucinidae belonging to the subfamily Opinae. |
| Ostrea jibananandai | Sp. nov | Valid | Halder & Mitra | Eocene (Ypresian) | Cambay Shale | India | A species of Ostrea. |
| Palaeolignopholas | Gen. et sp. nov | Valid | Bolotov et al. | Late Cretaceous (Cenomanian) | Burmese amber | Myanmar | A member of the family Pholadidae belonging to the subfamily Martesiinae. The type species is P. kachinensis. |
| Pandora? paleocenica | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Parmicorbula? sublaevis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Perezigonia | Nom. nov | Valid | Ceccolini & Cianferoni | Middle Jurassic | | Chile | A replacement name for Perezella Cooper (2015). |
| Pojetaia robsonae | Sp. nov | Valid | Peel & Skovsted | Cambrian Stage 4 | Kane Basin Formation | Canada ( Nunavut) | |
| Porterius? strangensis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Poultoniella | Gen. et comb. nov | Valid | Cooper | Cretaceous | | Canada ( British Columbia) | A member of the family Megatrigoniidae. Genus includes "Trigonia" newcombei Packard (1921). |
| Promyophorella basoaltorum | Sp. nov | Valid | Echevarría, Damborenea & Manceñido | Early Jurassic | | Argentina | A member of Trigoniida belonging to the family Myophorellidae. |
| Promyophorella? sanjuanina | Sp. nov | Valid | Echevarría, Damborenea & Manceñido | Early Jurassic | | Argentina | A member of Trigoniida belonging to the family Myophorellidae. |
| Pseudapiotrigonia | Gen. et comb. nov | Valid | Cooper | | | United States ( South Dakota Utah) | A member of the family Vaugoniidae. Genus includes "Trigonia" sturgisensis Whitfield & Hovey (1906), as well as "Vaugonia" utahensis Imlay (1964). |
| Pseudovaugonia | Gen. nov | Valid | Echevarría, Damborenea & Manceñido | Early Jurassic | | Argentina | A member of Trigoniida belonging to the family Myophorellidae. |
| Pteromeris nodulina | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Pteromeris. |
| Repmanigonia | Nom. nov | Valid | Ceccolini & Cianferoni | Jurassic | | Russia | A replacement name for Repmania Kolesnikov (1980). |
| Schedocardia imperfecta | Sp. nov | Valid | Berezovsky | Eocene | | Ukraine | A cockle. |
| Sinoliaoningia | Nom. nov | Valid | Ceccolini & Cianferoni | Late Triassic | Yangcaogou Formation | China | A replacement name for Liaoningia Yu & Dong (1993). |
| Sokolovskya | Gen. et comb. nov | Valid | Cooper | | | | A member of the family Megatrigoniidae. Genus includes "Apiotrigonia" levinae Pojarkova (1990) and "Apiotrigonia" khoresmensis Belyakova (1965). |
| Sonoragonia | Gen. et comb. et nom. nov | Valid | Cooper | Early Cretaceous | Lowell Formation | United States ( Arizona) | A member of the family Megatrigoniidae. Genus includes "Trigonia" cragini Stoyanow (1949), as well as S. scotti (a replacement name for Trigonia kitchini Stoyanow, 1949). |
| Sphenotomorpha orientalis | Sp. nov | Valid | Dalenz Farjat | Devonian (Pragian) | Icla Formation | Bolivia | A member of Modiomorphida belonging to the family Modiomorphidae. |
| Sunetta crassatelliformis | Sp. nov | Valid | Haga & Fukuda in Fukuda et al. | Early Pleistocene | | Japan | A species of Sunetta. |
| Sunetta nomurai | Sp. nov | Valid | Haga & Fukuda in Fukuda et al. | Pleistocene | | Taiwan | A species of Sunetta. |
| Syndesmyella pliominor | Sp. nov | Valid | Brunetti & Cresti | Early Pliocene | | Spain | A member of the family Semelidae. |
| Tellina brevis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A species of Tellina. |
| Terrypoultoniella | Gen. et sp. nov | Valid | Echevarría, Damborenea & Manceñido | Early Jurassic (Pliensbachian–Toarcian) | | Argentina  Portugal? | A member of Trigoniida belonging to the family Frenguelliellidae. The type species is "Poultoniella" jaworskii Echevarría, Damborenea & Manceñido (2021); genus might also include "Trigonia" malladae Choffat (1885). |
| Tindaria hamuroi | Sp. nov | Valid | Amano & Haga | Miocene | Higashibessho Formation | Japan | A member of the family Tindariidae. |
| Titomaya | Gen. et comb. et sp. nov | Valid | Alvarez & del Río | Paleocene (Danian) | Lefipán Formation Salamanca Formation | Argentina | A member of Venerida belonging to the group Veneroidea. Genus includes "Meretrix" chalcedonica, as well as new species T. longobucca. |
| Tivelina texana | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Tivelina trigonalis | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | |
| Unionites kobyumensis | Sp. nov | Valid | Biakov in Biakov & Kutygin | Late Permian | | Russia | |
| Vaccinites alencasteri | Sp. nov | Valid | Mitchell | Late Cretaceous (probably late Turonian or early Coniacian) | Cuautla Formation | Mexico | A rudist bivalve. |
| Vaccinites temazcali | Sp. nov | Valid | Mitchell | Late Cretaceous (Campanian) | Temazcal Limestone | Mexico | A rudist bivalve. |
| Villamilia | Gen. et comb. nov | Valid | Cooper & Leanza | Cretaceous | | Colombia | A member of the family Buchotrigoniidae. Genus includes "Buchotrigonia" etayoi Villamil (1992), "Trigonia" humboldtii Buch (1839), "Buchotrigonia" kauffmani Villamil (1992), "Buchotrigonia" perezi Villamil (1992) and "Vaugonia niranohamensis" santamariae Geyer (1973; raised to the rank of the species V. santamariae). |
| Weyla santuccii | Sp. nov | Valid | Damborenea et al. | Early Jurassic (Hettangian) | Pogibshi Formation | United States ( Alaska) | A scallop. |
| Whitfieldiella luceae | Sp. nov | Valid | Mitchell | Late Cretaceous (Campanian) | Clifton Limestone Cotui Limestone | Jamaica  United States ( Puerto Rico) | A rudist bivalve. |
| Yunannia | Gen. et 2 sp. nov | Valid | Zhang & Niu in Zhang et al. | Ordovician | Dongchong Formation | China | A member of Pteriomorphia of uncertain phylogenetic placement. The type species is Y. gankengensis; genus also includes Y. yunkaiensis. |

### Research

* A study on the evolution and possible causes of the extinction of alatoconchid bivalves is published by Chen et al. (2021).
* A study on the arcoid bivalve diversity during the Eocene doubthouse interval of global climate cooling is published by Hickman (2021).

## Other molluscs

| Name | Novelty | Status | Authors | Age | Type locality | Country | Notes |
| Anabarella? navaranae | Sp. nov | Valid | Peel | Cambrian Stage 4 | Aftenstjernesø Formation | Greenland | |
| Cadulus praepalmerae | Sp. nov | Valid | Garvie | Paleocene (Danian) | Kincaid Formation | United States ( Texas) | A tusk shell, a species of Cadulus. |
| Catalanispira prima | Sp. nov | Valid | Ebbestad & Cope | Ordovician (Floian) | | United Kingdom | A member of the family Onychochilidae. |
| Figurina? polaris | Sp. nov | Valid | Peel | Cambrian Stage 4 | Aftenstjernesø Formation | Greenland | A helcionellid. Subsequently made the type species of a separate genus Sermeqiconus. |
| Hippopharangites groenlandicus | Sp. nov | Valid | Peel | Cambrian Stage 4 | Aftenstjernesø Formation | Greenland | A member of the stem group of Aculifera. |
| Holoornatus | Gen. et sp. nov | In press | Zhang et al. | Cambrian (Fortunian) | | China | A maikhanellid. Genus includes new species H. strigatus. |
| Inughuitoconus | Gen. et sp. nov | Valid | Peel | Cambrian Stage 4 | Aftenstjernesø Formation | Greenland | A member of the stem group of Aculifera. Genus includes new species I. borealis. |
| Lepidozona luzanovkensis | Sp. nov | Valid | Sirenko | Paleocene | Luzanovka Beds | Ukraine | A chiton, a species of Lepidozona. |
| Minodentalium | Gen. et 2 sp. et comb. nov | Valid | Asato & Kase | Permian | Akasaka Limestone | Belgium  Japan  New Zealand  United States | A tusk shell. Genus includes new species M. hayasakai and M. okumurai, as well as "Plagioglypta" furcata Waterhouse (1980), "Pl." girtyi Knight (1940), "Pl." subannulata Easton (1962), "Dentalium" ingens De Koninck (1843), "D." meekianum Geinitz (1866), "Pl." prosseri Morningstar (1922), "Dentalium" priscum Münster in Goldfuss (1842) and "D." herculeum De Koninck (1863). |
| Ocruranus? kangerluk | Sp. nov | Valid | Peel | Cambrian Stage 4 | Aftenstjernesø Formation | Greenland | A member of the stem group of Aculifera. |
| Prodentalium onoi | Sp. nov | Valid | Asato & Kase | Permian | Akasaka Limestone | Japan | A tusk shell. |
| Progadilinoides | Gen. et sp. nov | Valid | Guzhov | Early Cretaceous (Aptian) | | Russia | A tusk shell belonging to the family Pulsellidae. The type species is P. balakovensis. |
| Pseudomyona groenlandica | Sp. nov | Valid | Peel | Cambrian (Drumian) | Fimbuldal Formation | Greenland | A member of Rostroconchia belonging to the group Tuarangiida and the family Tuarangiidae. |
| Qingjianglepas | Gen. et sp. nov | In press | Li et al. | Cambrian | | China | A minute limpet-shaped shell, probably belonging to a helcionelloid. Genus includes new species Q. elegans. |
| Stenotheca? higginsi | Sp. nov | Valid | Peel | Cambrian Stage 4 | Aftenstjernesø Formation | Greenland | |

## General research

* A study on the relationship between temperature and diversity in the fossil record of marine molluscs over the last 145 million years is published by Boag, Gearty & Stockey (2021).
* A study on the relationship between the species richness of shallow-marine molluscs, the number of ecological functional groups, and oceanic temperature in the fossil record of New Zealand over the last ~40 million years is published by Womack et al. (2021).