- arbaguil, Chicoreus arbaguil R. Houart, 2015 - (MURICIDAE)
- arbala, Myalina arbala Newell, 1942 † - (MYALINIDAE) (FOSSIL)
- arbalensis, Xerosecta guercifiana arbalensis P.M. Pallary, 1927 - (HYGROMIIDAE)
- arbalensis, Melanopsis arbalensis L.J.J.M. Pérès, 1939 - syn of: Melanopsis scalaris arbalensis (L.J.J.M. Pérès, 1939) - (MELANOPSIDAE)
- arbalensis, Melanopsis scalaris arbalensis (L.J.J.M. Pérès, 1939) - (MELANOPSIDAE)
- arbanus, Albanites arbanus (Arthaber, 1911 †) - (MEEKOCERATIDAE) (FOSSIL)
- arbanus, Pronorites arbanus Arthaber, 1911 † - syn of: Albanites arbanus (Arthaber, 1911 †) - (PRONORITIDAE) (FOSSIL)
- arbastoi, Horologica arbastoi A. Cecalupo & I. Perugia, 2013 - (CERITHIOPSIDAE)
- arbela, Cymatosyrinx arbela (W.H. Dall, 1919) - (DRILLIIDAE)
- arbela, Pyrgocythara arbela W.H. Dall, 1919 - syn of: Pyrgocythara hemphilli P. Bartsch & H.A. Rehder, 1939 - (MANGELIIDAE)
- arbitrata, Myonia arbitrata Reed, 1932 † - (VACUNELLIDAE) (FOSSIL)
- arbolensis, Amotapus arbolensis (Woods, 1922 †) - (RAETOMYIDAE) (FOSSIL)
- Arborcinea, syn of: Genus Succinea J.P.R. Draparnaud, 1801 (SUCCINEIDAE)
- arborea, Meryticola arborea C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- arborea, Leptachatina arborea E.R. Sykes, 1900 - (AMASTRIDAE)
- arborea, Phaedusa arborea K. Tomiyama, 1984 - (CLAUSILIIDAE)
- arborea, Leiostyla arborea R.T. Lowe, 1854 - (LAURIIDAE)
- arborea, Ostrea arborea R.W. Dunker, 1882 - syn of: Crassostrea rhizophorae (L. Guilding, 1828) - (OSTREIDAE)
- arborea, Shuttleworthia arborea H.B. Baker, 1941 - (SPIRAXIDAE)
- arborea sororcula, Meryticola arborea sororcula C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- arboreoides, Hyalosagda arboreoides (C.B. Adams, 1845) - (SAGDIDAE)
- arborescens, Bornella arborescens W.H. Pease, 1871 - syn of: Bornella stellifer (A. Adams & L.A. Reeve in A. Adams, 1848) - (BORNELLIDAE)
- arborescens, Dendrodoris arborescens (C. Collingwood, 1881) - (DENDRODORIDIDAE)
- arborescens, Dendronotus arborescens O.F. Müller, 1776 - syn of: Dendronotus frondosus (P. Ascanius, 1774) - (DENDRONOTIDAE)
- arborescens, Dendronotus arborescens J. Alder & A. Hancock, 1840 - syn of: Dendronotus frondosus (P. Ascanius, 1774) - (DENDRONOTIDAE)
- arborescens, Doris arborescens O.F. Müller, 1776 - syn of: Dendronotus frondosus (P. Ascanius, 1774) - (DORIDIDAE)
- arborescens, Modiolus arborescens L.W. Dillwyn, 1817 - syn of: Amygdalum dendriticum J.K. Megerle Von Mühlfeld, 1811 - (MYTILIDAE)
- arborescens, Octopus arborescens W.E. Hoyle, 1904 - (OCTOPODIDAE)
- arborescens, Marionia arborescens L.S.R. Bergh, 1890 - syn of: Marionia cyanobranchiata (W.P.E.S. Rüppell & F.S. Leuckart, 1828) - (TRITONIIDAE)
- arboreus, Zonitoides arboreus (T. Say, 1816) - (GASTRODONTIDAE)
- arboreus, Helix arboreus T. Say, 1816 - syn of: Zonitoides arboreus (T. Say, 1816) - (HELICIDAE)
- arboricola, Flammulina arboricola (T. Iredale, 1913) - (CHAROPIDAE)
- arboricola, Littoraria arboricola L.A. Reeve, 1857 - syn of: Littoraria pallescens (R.A. Philippi, 1846) - (LITTORINIDAE)
- arboricola, Littorinopsis arboricola R.A. Philippi in G. Nevill, 1885 - syn of: Littoraria lutea (R.A. Philippi, 1847) - (LITTORINIDAE)
- arboricola, Truncatellina arboricola P. Tattersfield, 1995 - (VERTIGINIDAE)
- arboricoloa, Flammulina arboricoloa T. Iredale, 1913 - syn of: Flammulina arboricola (T. Iredale, 1913) - (CHAROPIDAE)
- arboriferus, Neopetraeus arboriferus (H.A. Pilsbry, 1898) - (BULIMULIDAE)
- arboriferus latistrigatus, Neopetraeus arboriferus latistrigatus H.A. Pilsbry, 1898 - (BULIMULIDAE)
- arboriferus obesus, Neopetraeus arboriferus obesus W.K. Weyrauch, 1967 - (BULIMULIDAE)
- arboriferus paucistrigatus, Neopetraeus arboriferus paucistrigatus W.K. Weyrauch, 1967 - (BULIMULIDAE)
- arboriferus rectistrigatus, Neopetraeus arboriferus rectistrigatus H.A. Pilsbry, 1898 - (BULIMULIDAE)
- arbornatalis, Conus arbornatalis A.J. Da Motta, 1978 - syn of: Leptoconus amadis (J.F. Gmelin, 1791) - (CONIDAE)
- arborum, Limax arborum N.R. Bouchard-Chantereaux, 1838 - syn of: Lehmannia marginata (O.F. Müller, 1774) - (LIMACIDAE)
- arbucklei, Bathytoma arbucklei R.N. Kilburn, 1986 - (BORSONIIDAE)
- arbucklensis, Eochiton arbucklensis Smith & Toomey, 1964 † - (GOTLANDOCHITONIDAE) (FOSSIL)
- arbucklensis, Eupachydiscus arbucklensis Anderson, 1958 † - (PACHYDISCIDAE) (FOSSIL)
- arbuscula, Doto arbuscula A.E.R. Agassiz, 1850 - syn of: Doto coronata (J.F. Gmelin, 1791) - (DOTIDAE)
- arbusculae, Omphalotropis arbusculae E. Fischer-Piette, F. Blanc & F. Salvat, 1969 - (ASSIMINEIDAE)
- arbusta, Strophiops arbusta C.J. Maynard & W.F. Clapp, 1921 - syn of: Cerion glans H.C. Küster, 1844 - (CERIONIDAE)
- arbustigerum, Wagnericeras arbustigerum (Orbigny †) - (PERISPHINCTIDAE) (FOSSIL)
- arbustorum, Arianta arbustorum (C. Linnaeus, 1758) - (HELICIDAE)
- arbustorum, Monacha arbustorum C. Linnaeus, 1758 - syn of: Arianta arbustorum (C. Linnaeus, 1758) - (HYGROMIIDAE)
- arbustorum alpestris, Arianta arbustorum alpestris E.A. Rossmässler, 1837 - syn of: Arianta arbustorum alpicola (A.E.J. Férussac, 1821) - (HELICIDAE)
- arbustorum alpicola, Arianta arbustorum alpicola (A.E.J. Férussac, 1821) - (HELICIDAE)
- arbustorum calcarea, Arianta arbustorum calcarea D.S. Högberg, 1841 - (HELICIDAE)
- arbustorum canigonensis, Arianta arbustorum canigonensis (N. Boubee, 1833) - (HELICIDAE)
- arbustorum creticola, Arianta arbustorum creticola O.A.L. Mörch, 1864 - (HELICIDAE)
- arbustorum picea, Arianta arbustorum picea (E.A. Rossmässler, 1837) - (HELICIDAE)
- arbustorum pseudorudis, Arianta arbustorum pseudorudis (H.A. Schlesch, 1924) - (HELICIDAE)
- arbustorum repellini, Arianta arbustorum repellini (L.A. Reeve, 1852) - (HELICIDAE)
- arbustorum styriaca, Arianta arbustorum styriaca (G.R. von Frauenfeld, 1868) - (HELICIDAE)
- arbustorum vareliensis, Arianta arbustorum vareliensis T.E.J. Ripken & G. Falkner, 2000 - syn of: Arianta arbustorum varielensis T.E.J. Ripken & G. Falkner, 2000 - (HELICIDAE)
- arbustorum varielensis, Arianta arbustorum varielensis T.E.J. Ripken & G. Falkner, 2000 - (HELICIDAE)
- arbuta, Thorunna arbuta (R.F. Burn, 1961) - (CHROMODORIDIDAE)
- arbuta, Glossodoris arbuta R.F. Burn, 1961 - syn of: Thorunna arbuta (R.F. Burn, 1961) - (CHROMODORIDIDAE)
- arbuta, Digidentis arbuta R.F. Burn, 1961 - syn of: Thorunna arbuta (R.F. Burn, 1961) - (CHROMODORIDIDAE)
- arbutum, Ischnochiton arbutum (L.A. Reeve, 1847) - (ISCHNOCHITONIDAE)
- arbutum, Haploplax arbutum (L.A. Reeve, 1847) - syn of: Ischnochiton arbutum (L.A. Reeve, 1847) - (ISCHNOCHITONIDAE)
- arbutum, Mipus arbutum (L.H. Woolacott, 1954) - (MURICIDAE)
- arbutus, Placostylus bollonsi arbutus A.W.B. Powell, 1948 - (BOTHRIEMBRYONTIDAE)
- arbutus, Rostanga arbutus (G.F. Angas, 1864) - (DISCODORIDIDAE)
- arbutus, Doris arbutus G.F. Angas, 1864 - syn of: Rostanga arbutus (G.F. Angas, 1864) - (DORIDIDAE)
- arca, Archinacella arca Wahlman, 1992 † - (ARCHINACELLIDAE) (FOSSIL)
- Arca, Genus Arca C. Linnaeus, 1758 (ARCIDAE)
- arca, Dreissena arca J. Kickx, 1834 - syn of: Dreissena polymorpha (P.S. Pallas, 1771) - (DREISSENIDAE)
- arca, Elliptio arca T.A. Conrad, 1834 - (UNIONIDAE)
- arca nalivkini, Mytilus arca nalivkini A.V. Ali-Zade, 1961 - syn of: Dreissena polymorpha (P.S. Pallas, 1771) - (MYTILIDAE)
- arcacea, Musculus arcacea R. Tate, 1886 † - (MYTILIDAE) (FOSSIL)
- Arcacites, syn of: Genus Arca C. Linnaeus, 1758 (ARCIDAE)
- arcadia, Chondrina arcadia (C.A. Westerlund, 1883) - (CHONDRINIDAE)
- arcadia, Albinaria arcadia (O. Böttger, 1878) - (CLAUSILIIDAE)
- arcadiana, Kalitinaia arcadiana (A.A. Schileyko, 1967) - (HYGROMIIDAE)
- arcadica, Chondrina arcadica (O.W.H. Reinhardt, 1881) - (CHONDRINIDAE)
- arcadica, Albinaria arcadica (L. Pfeiffer, 1868) - (CLAUSILIIDAE)
- arcadica, Thiessea arcadica (L. Pfeiffer, 1853) - (HELICIDAE)
- arcadica, Helicigona arcadica (G.P. Deshayes, 1839) - (HELICIDAE)
- arcadica, Codringtonia intusplicata arcadica (W. Kobelt, 1902) - (HELICIDAE)
- arcadica abundans, Chondrina arcadica abundans (C.A. Westerlund, 1894) - (CHONDRINIDAE)
- arcadica bulgarica, Chondrina arcadica bulgarica H. Nordsieck, 1970 - (CHONDRINIDAE)
- arcadica caucasica, Chondrina arcadica caucasica P. Ehrmann, 1931 - syn of: Chondrina clienta caucasica P. Ehrmann, 1931 - (CHONDRINIDAE)
- arcadica clienta, Chondrina arcadica clienta C.A. Westerlund, 1883 - syn of: Chondrina clienta (C.A. Westerlund, 1883) - (CHONDRINIDAE)
- arcadica dorica, Albinaria arcadica dorica (O. Böttger, 1889) - (CLAUSILIIDAE)
- arcadica hydriota, Albinaria arcadica hydriota (O. Böttger, 1889) - (CLAUSILIIDAE)
- arcadica leucochroa, Albinaria arcadica leucochroa H. Nordsieck, 1984 - (CLAUSILIIDAE)
- arcadica occulta, Albinaria arcadica occulta H. Nordsieck, 2015 - (CLAUSILIIDAE)
- arcadiensis, Scaphites arcadiensis Moreman, 1942 † - (SCAPHITIDAE) (FOSSIL)
- arcadiformis, Trapezicardita arcadiformis (Keeping, 1883 †) - (CARDITIDAE) (FOSSIL)
- arcadiformis, Modiolus arcadiformis Keeping † - (MYTILIDAE) (FOSSIL)
- arcadioi, Nassarius arcadioi E. Rolán & J.M. Hernández, 2005 - (NASSARIIDAE)
- arcaeforme, Pisidium arcaeforme A.W. Malm, 1855 - syn of: Pisidium milium F. Held, 1836 - (SPHAERIIDAE)
- arcaeformis, Cardium arcaeformis A.C. Chapman & I. Crespin, 1934 † - syn of: Glans arcaeformis (A.C. Chapman & I. Crespin, 1934 †) - (CARDIIDAE) (FOSSIL)
- arcaeformis, Glans arcaeformis (A.C. Chapman & I. Crespin, 1934 †) - (CARDITIDAE) (FOSSIL)
- arcaeformis, Corbula arcaeformis H. Lynge, 1909 - (CORBULIDAE)
- arcaeformis, Cucullaea arcaeformis Netschaev † - (CUCULLAEIDAE) (FOSSIL)
- arcaeformis, Lyonsia arcaeformis E.C. Von Martens, 1885 - (LYONSIIDAE)
- arcaeformis, Musculus arcaeformis A.E.M. Cossmann, 1887 † - (MYTILIDAE) (FOSSIL)
- arcaeformis, Anemina arcaeformis (P.M. Heude, 1877) - (UNIONIDAE)
- arcaeformis, Epioblasma arcaeformis (I. Lea, 1831) - (UNIONIDAE)
- arcaeformis flavotincta, Anemina arcaeformis flavotincta (E.C. Von Martens, 1905) - (UNIONIDAE)
- arcaeformis sujfunica, Anodonta arcaeformis sujfunica W.A. Lindholm, 1925 - syn of: Anemina arcaeformis (P.M. Heude, 1877) - (UNIONIDAE)
- arcahaiense, Weinlandipoma gonavense arcahaiense P. Bartsch, 1946 - (POMATIIDAE)
- arcaica, Taringa arcaica L. Moro & J.A. Ortea, 2015 - (DISCODORIDIDAE)
- arcana, Architectonica arcana R. Bieler, 1993 - (ARCHITECTONICIDAE)
- arcana, Chama arcana Bernard, 1976 - (CHAMIDAE)
- arcana, Littorina arcana C.J. Hannaford-Ellis, 1978 - (LITTORINIDAE)
- arcana, Purella arcana Valkov, 1987 † - (MAIKHANELLIDAE) (FOSSIL)
- arcana, Uttleya arcana J. Marwick, 1934 † - (MURICIDAE) (FOSSIL)
- arcana, Tripterotyphis arcana (H. DuShane, 1969) - (MURICIDAE)
- arcana, Comitas arcana (E.A. Smith, 1899) - (PSEUDOMELATOMIDAE)
- arcana, Turbonilla arcana C.R. Laws, 1937 † - (PYRAMIDELLIDAE) (FOSSIL)
- arcangelae, Clathropsis arcangelae Cecalupo & Perugia, 2017 - (CERITHIOPSIDAE)
- Arcanoceras, Genus Arcanoceras Ruzhencev , 1965 † (EOGONIOLOBOCERATIDAE) (FOSSIL)
- arcanum, Pseudophragmoceras arcanum P.A. Zhuravleva, 1972 † - syn of: Bolloceras arcanum (P.A. Zhuravleva, 1972 †) - (DISCOSORIDA (unassigned)) (FOSSIL)
- arcanum, Epitonium arcanum H. DuShane, 1979 - (EPITONIIDAE)
- arcanum, Zaghouanites arcanum (Wiedenmayer, 1977 †) - (LYTOCERATIDAE) (FOSSIL)
- arcanum, Bolloceras arcanum (P.A. Zhuravleva, 1972 †) - (NOTHOCERATIDAE) (FOSSIL)
- arcanum, Phragmoceras arcanum Foerste, 1930 † - (PHRAGMOCERATIDAE) (FOSSIL)
- arcanus, Marginella arcanus S.G. Veldsman, A. Aiken & S.G. Veldsman, 2014 - (MARGINELLIDAE)
- Arcaria, syn of: Genus Arca C. Linnaeus, 1758 (ARCIDAE)
- arcas, Lissodrillia arcas P.J. Fallon, 2016 - (DRILLIIDAE)
- arcas, Terebra arcas R.T. Abbott, 1954 - (TEREBRIDAE)
- arcasiana, Karaftohelix arcasiana (J.C.H. Crosse & E.O. Debeaux, 1863) - (BRADYBAENIDAE)
- arcasiana depressior, Helix arcasiana depressior L. von Schrenck, 1867 - syn of: Karaftohelix arcasiana (J.C.H. Crosse & E.O. Debeaux, 1863) - (HELICIDAE)
- arcasiana normalis, Helix arcasiana normalis L. von Schrenck, 1867 - syn of: Karaftohelix arcasiana (J.C.H. Crosse & E.O. Debeaux, 1863) - (HELICIDAE)
- arcasianus, Ortizius arcasianus G. Servain, 1880 - syn of: Oxychilus allarius (J.S. Miller, 1822) - (OXYCHILIDAE)
- Arcaspidoceras, Genus Arcaspidoceras Jeannet , 1951 † (ASPIDOCERATIDAE) (FOSSIL)
- Arcavicula, Genus Arcavicula Cox, 1964 † (PTERIIDAE) (FOSSIL)
- arcelini, Planorbis arcelini J.R. Bourguignat, 1870 † - (PLANORBIDAE) (FOSSIL)
- arcelini, Valvata arcelini J.R. Bourguignat, 1870 † - syn of: Planorbis arcelini J.R. Bourguignat, 1870 † - (VALVATIDAE) (FOSSIL)
- arcella, Cardites arcella A. Valenciennes in A. Dupetit-Thouars, 1846 - syn of: Cardites laticostatus (G.B. I Sowerby, 1833) - (CARDITIDAE)
- arcella, Cirsotrema arcella H.A. Rehder, 1945 - syn of: Cirsotrema dalli H.A. Rehder, 1945 - (EPITONIIDAE)
- arcella, Cirsotremopsis arcella H.A. Rehder, 1945 - syn of: Cirsotrema dalli H.A. Rehder, 1945 - (EPITONIIDAE)
- arcellus, Ventridens arcellus L.R. Hubricht, 1976 - (GASTRODONTIDAE)
- Arceodomus, Genus Arceodomus Pojeta & Runnegar, 1976 † (CONOCARDIIDAE) (FOSSIL)
- arces, Pseudamussium arces W.H. Dall, 1913 - syn of: Delectopecten polyleptus (W.H. Dall, 1908) - (PECTINIDAE)
- Arcestes, Genus Arcestes Suess , 1865 † (ARCESTIDAE) (FOSSIL)
- ARCESTIDAE Mojsisovics, 1875 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-ARCESTOIDEA [Superfamily]) (FOSSIL)
- arceuthophila, Trochoidea arceuthophila J.F. Mabille, 1881 - syn of: Amandana geyeri (L. Soós, 1926) - (HYGROMIIDAE)
- Archa, syn of: Genus Arca C. Linnaeus, 1758 (ARCIDAE)
- Archachatina, Genus Archachatina J.A. Albers, 1850 (ACHATINIDAE)
- archaea, Orania archaea R. Houart, 1995 - (MURICIDAE)
- archaea hitomiae, Orania archaea hitomiae R. Houart & C.O. Moe, 2011 - (MURICIDAE)
- Archaegopis, Genus Archaegopis W.A. Wenz, 1914 (ZONITIDAE)
- archaenepeanenesis, Pleuromeris archaenepeanenesis A.C. Chapman & I. Crespin, 1928 † - (CARDITIDAE) (FOSSIL)
- ARCHAEOCARDIIDAE Khalfin, 1940 † - Family (BIVALVIA-HETERODONTA [Subclass]-ARCHIHETERODONTA [Infraclass]-CARDITIDA [Order]) (FOSSIL)
- Archaeocardium, Genus Archaeocardium Khalfin, 1940 † (ARCHAEOCARDIIDAE) (FOSSIL)
- Archaeoconus, syn of: Genus Archeoconus Stinchcomb , 1986 † (SHELBYOCERIDAE) (FOSSIL)
- ARCHAEOGASTROPODA (UNASSIGNED) - Family (GASTROPODA-ARCHAEOGASTROPODA [Subclass]) (FOSSIL)
- Archaeomenia, Genus Archaeomenia K.H.J. Thiele, 1906 (HEMIMENIIDAE)
- Archaeophiala, syn of: Genus Archaeophialia Perner , 1903 † (ARCHAEOPHIALIDAE) (FOSSIL)
- Archaeophialia, Genus Archaeophialia Perner , 1903 † (ARCHAEOPHIALIDAE) (FOSSIL)
- ARCHAEOPHIALIDAE Knight & Yochelson, 1958 † - Family (MONOPLACOPHORA-TRYBLIDIIDA [Order]-KIRINGELLOIDEA [Superfamily]) (FOSSIL)
- Archaeoplecta, Genus Archaeoplecta Gude, 1911 † (ARCHAEOZONITIDAE) (FOSSIL)
- Archaeopraga, Genus Archaeopraga Horný, 1963 † (ARCHAEOPRAGIDAE) (FOSSIL)
- ARCHAEOPRAGIDAE Horný, 1963 † - Family (MONOPLACOPHORA-ARCHINACELLIDA [Order]-ARCHINACELLOIDEA [Superfamily]) (FOSSIL)
- Archaeoradiolites, Genus Archaeoradiolites Fenerci-Masse & al., 2006 † (RADIOLITIDAE) (FOSSIL)
- Archaeosepia, Genus Archaeosepia Szorhyi, 1934 † (SEPIIDA (UNASSIGNED)) (FOSSIL)
- Archaeosphera, Genus Archaeosphera Heidelberger & Bandel, 1999 † (OMPHALOTROCHIDAE) (FOSSIL)
- Archaeospira, syn of: Genus Latouchella Cobbold, 1921 † (COREOSPIRIDAE) (FOSSIL)
- Archaeoxesta, Genus Archaeoxesta W. Kobelt, 1909 (ZONITIDAE)
- Archaeozonites, Genus Archaeozonites Sandberger, 1873 † (ARCHAEOZONITIDAE) (FOSSIL)
- ARCHAEOZONITIDAE Pfeffer, 1930 † - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-GASTRODONTOIDEA [Superfamily]) (FOSSIL)
- archaeus, Anomia archaeus Gray, 1849 - (ANOMIIDAE)
- Archaica, Genus Archaica A.A. Schileyko, 1970 (HYGROMIIDAE)
- Archaicosta, Genus Archaicosta Schileyko, 2006 (HYGROMIIDAE)
- Archanarcestes, Genus Archanarcestes Becker & House, 1994 † (MIMAGONIATITIDAE) (FOSSIL)
- archangelica, Stagnicola archangelica (N.D. Kruglov & Y.I. Starobogatov, 1986) - (LYMNAEIDAE)
- archangelica, Lymnaea archangelica N.D. Kruglov & Y.I. Starobogatov, 1986 - syn of: Stagnicola archangelica (N.D. Kruglov & Y.I. Starobogatov, 1986) - (LYMNAEIDAE)
- archangelskii, Valvatamnicola archangelskii (V.I. Zhadin, 1952) - (HYDROBIIDAE)
- Archanodon, Genus Archanodon Howse, 1878 † (AMNIGENIIDAE) (FOSSIL)
- ARCHANODONTIDAE Weir, 1969 † - Family (BIVALVIA-PALAEOHETERODONTA [Subclass]-UNIONIDA [Order]) (FOSSIL)
- Archarax, syn of: Genus Acharax W.H. Dall, 1908 (SOLEMYIDAE)
- archboldi, Praekolymia archboldi Biakov, 2008 † - (KOLYMIIDAE) (FOSSIL)
- Archboldiceras, Genus Archboldiceras Leonova & Shilovsky, 2007 † (SPIROLEGOCERATIDAE) (FOSSIL)
- Archecharax, syn of: Genus Arhecharax F.G. Thompson, 1980 (PROSERPINELLIDAE)
- archeducis, Islamia archeducis H.D. Boeters & J. Beckmann, 2007 - (HYDROBIIDAE)
- Archefulgur, Genus Archefulgur Petuch, R.F. Myers & Berschauer, 2015 † (ECHINOFULGURIDAE) (FOSSIL)
- Archegocoptis, Genus Archegocoptis H.A. Pilsbry, 1903 (UROCOPTIDAE)
- archelaus, Protrachyceras archelaus (Laube †) - (TRACHYCERATIDAE) (FOSSIL)
- Archelix, syn of: Genus Otala H.C.F. Schumacher, 1817 (HELICIDAE)
- Archendoceras, Genus Archendoceras Chen & Qi in Chen Tsou, Chen & Qi, 1979 † (YANHECERIDA (UNASSIGNED)) (FOSSIL)
- archensis, Attenuata archensis (W.L. May, 1913) - (RISSOIDAE)
- Archeoconus, Genus Archeoconus Stinchcomb , 1986 † (SHELBYOCERIDAE) (FOSSIL)
- Archeorachis, Genus Archeorachis Schileyko, 1998 (CERASTUIDAE)
- archerae, Neophlycticeras archerae A.T. Young, 1979 † - (LYELLICERATIDAE) (FOSSIL)
- Archerelix, Subgenus Stenotrema (Archerelix) Emberton, 1995 (POLYGYRIDAE)
- archeri, Helicostyla concinna archeri (W.J. Clench, 1936) - (BRADYBAENIDAE)
- archeri, Austrocypraea archeri (J.E. Tenison-Woods, 1876 †) - (CYPRAEIDAE) (FOSSIL)
- archeri, Cyclostrema archeri G.W. Tryon, 1888 - (LIOTIIDAE)
- archeri, Liguus fasciatus archeri W.J. Clench, 1934 - (ORTHALICIDAE)
- archeri, Fumonelix archeri (H.A. Pilsbry, 1940) - (POLYGYRIDAE)
- archeri, Monilispira archeri A.A. Olsson & A. Harbison, 1953 † - (PSEUDOMELATOMIDAE) (FOSSIL)
- archeri, Turbonilla archeri W.H. Dall & P. Bartsch, 1904 - (PYRAMIDELLIDAE)
- archeri, Amphinaias archeri L.S. Frierson, 1905 - syn of: Amphinaias asperata (I. Lea, 1861) - (UNIONIDAE)
- archeri, Lyria beauii archeri (G.F. Angas, 1865) - (VOLUTIDAE)
- archetypum, Pyrgulina archetypum Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- archetypus, Conus archetypus J.C.H. Crosse, 1865 - syn of: Poremskiconus ziczac archetypus (J.C.H. Crosse, 1865) - (CONIDAE)
- archetypus, Poremskiconus ziczac archetypus (J.C.H. Crosse, 1865) - (CONIDAE)
- archetypus brasiliensis, Conus archetypus brasiliensis W.J. Clench, 1942 - syn of: Poremskiconus ziczac archetypus (J.C.H. Crosse, 1865) - (CONIDAE)
- archeyi, Melanella archeyi (H.J. Finlay, 1928) - (EULIMIDAE)
- archeyi, Succinea archeyi (A.W.B. Powell, 1933) - (SUCCINEIDAE)
- archeyi, Austrosuccinea archeyi A.W.B. Powell, 1933 - syn of: Succinea archeyi (A.W.B. Powell, 1933) - (SUCCINEIDAE)
- archiaci, Ptychocerithium archiaci E.W. Vredenburg, 1928 † - (CERITHIIDAE) (FOSSIL)
- archiaci, Corbula archiaci (M. Rouault, 1849 †) - (CORBULIDAE) (FOSSIL)
- archiaci, Euomphalus archiaci G.A. Goldfuss, 1844 † - (EUOMPHALIDAE) (FOSSIL)
- archiaci, Vaccinites archiaci E.C. Munier-Chalmas, 1892 † - (HIPPURITIDAE) (FOSSIL)
- archiaci, Hoeninghausia archiaci Gürich, 1896 † - (KOENENITIDAE) (FOSSIL)
- archiaci, Murchisonia archiaci Paeckelmann, 1922 † - (MURCHISONIIDAE) (FOSSIL)
- archiaci, Nucula archiaci A.E.M. Cossmann & G. Pissarro, 1927 † - (NUCULIDAE) (FOSSIL)
- archiaci, Faunus archiaci Doncieux, 1908 † - (PACHYCHILIDAE) (FOSSIL)
- archiaci, Deltamya archiaci (Pictet & Renevier 1855) † - (PHOLADOMYIDAE) (FOSSIL)
- archiaci, Potamides archiaci Halder & Sinha, 2014 † - (POTAMIDIDAE) (FOSSIL)
- archiaci, Tripleuroceras archiaci (Barrande, 1868 †) - (TRIPLEUROCERATIDAE) (FOSSIL)
- archiaciana, Caprotina archiaciana A.V.M.D. D'Orbigny, 1842 † - (CAPROTINIDAE) (FOSSIL)
- archiaciana, Donaldospira archiaciana (de Koninck, 1843 †) - (ORTHONEMIDAE) (FOSSIL)
- archiaciana, Apricardia archiaciana (A.V.M.D. D'Orbigny, 1842 †) - (REQUIENIIDAE) (FOSSIL)
- archiacianum, Pseudocenoceras archiacianum (A.V.M.D. D'Orbigny, 1840 †) - (NAUTILIDAE) (FOSSIL)
- archiacianum, Nostoceras archiacianum (A.V.M.D. D'Orbigny, 1842 †) - (NOSTOCERATIDAE) (FOSSIL)
- archiacianus, Protohoplites archiacianus (A.V.M.D. D'Orbigny, 1841 †) - (HOPLITIDAE) (FOSSIL)
- archiacianus, Turrilites archiacianus d'Orbigny, 1842 † - syn of: Nostoceras archiacianum (A.V.M.D. D'Orbigny, 1842 †) - (TURRILITIDAE) (FOSSIL)
- archiacii, Lithophaga archiacii (A.V.M.D. D'Orbigny, 1844 †) - (MYTILIDAE) (FOSSIL)
- archiacii, Lithodomus archiacii A.V.M.D. D'Orbigny, 1844 † - syn of: Lithophaga archiacii (A.V.M.D. D'Orbigny, 1844 †) - (MYTILIDAE) (FOSSIL)
- Archiacoceras, Genus Archiacoceras Foerste, 1926 † (ARCHIACOCERATIDAE) (FOSSIL)
- ARCHIACOCERATIDAE Teichert, 1939 † - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-ONCOCERIDA [Order]) (FOSSIL)
- archibaldi, Ischnoptygma archibaldi Erwin, 1988 † - (ISCHNOPTYGMATIDAE) (FOSSIL)
- archibaldi, Leislingites archibaldi (Mojsisovics, 1896 †) - (THETIDITIDAE) (FOSSIL)
- archibenthale, Probuccinum archibenthale (J.C. Melvill & R. Standen, 1907) - (BUCCINIDAE)
- archibenthale, Pontiothauma archibenthale (J.C. Melvill & R. Standen, 1907) - (RAPHITOMIDAE)
- archibenthalis, Sibogasyrinx archibenthalis A.W.B. Powell, 1969 - syn of: Leucosyrinx archibenthalis (A.W.B. Powell, 1969) - (COCHLESPIRIDAE)
- archibenthalis, Acila divaricata archibenthalis T.A. Okutani - (NUCULIDAE)
- archibenthalis, Leucosyrinx archibenthalis (A.W.B. Powell, 1969) - (PSEUDOMELATOMIDAE)
- archibenthalis, Pontiothauma archibenthalis J.C. Melvill & R. Standen, 1907 - syn of: Pontiothauma archibenthale (J.C. Melvill & R. Standen, 1907) - (RAPHITOMIDAE)
- archibenthicola, Acteon archibenthicola T. Habe, 1955 - (ACTEONIDAE)
- archibenthicola, Micrelenchus archibenthicola R.K. Dell, 1956 - syn of: Cantharidus mortenseni (N.H. Odhner, 1924) - (TROCHIDAE)
- Archicardium, syn of: Genus Acanthocardia J.E. Gray, 1851 (CARDIIDAE)
- Archicypraea, Genus Archicypraea F.A. Schilder, 1926 † (CYPRAEIDAE) (FOSSIL)
- archidona, Neniops archidona (F.P. Jousseaume, 1900) - (CLAUSILIIDAE)
- Archidoris, Genus Archidoris L.S.R. Bergh, 1878 (DORIDIDAE)
- archiepiscopalis, Mitra archiepiscopalis J.B.P.A. Lamarck, 1811 - syn of: Mitra cardinalis (J.F. Gmelin, 1791) - (MITRIDAE)
- archiepiscopus, Conus archiepiscopus C.H. Hwass in J.G. Bruguière, 1792 - syn of: Cylinder textile (C. Linnaeus, 1758) - (CONIDAE)
- Archierato, Genus Archierato Schilder, 1933 † (TRIVIIDAE) (FOSSIL)
- archilyra, Cypraeovula capensis archilyra J. Van Heesvelde & J. Deprez, 2006 - (CYPRAEIDAE)
- archimedea, Monacha archimedea L. Benoit, 1859 - syn of: Monacha cartusiana (O.F. Müller, 1774) - (HYGROMIIDAE)
- Archimedea, Genus Archimedea Pcelincev, 1965 † (NERINEIDAE) (FOSSIL)
- archimedea, Cingulina archimedea J.C. Melvill, 1896 - (PYRAMIDELLIDAE)
- archimedes, Tornatellina archimedes H.H. Beck, 1837 - syn of: Strobilus turritus H.E. Anton, 1839 - (ACHATINELLIDAE)
- archimedes, Pomacea zonata archimedes (J.B. von Spix, 1827) - (AMPULLARIIDAE)
- Archimediella, Genus Archimediella F. Sacco, 1895 (TURRITELLIDAE)
- archimedis, Pomacea archimedis J.B. von Spix, 1827 - (AMPULLARIIDAE)
- archimedis, Emaciaticeras archimedis Fucini, 1931 † - (HILDOCERATIDAE) (FOSSIL)
- archimedis, Pyrgula archimedis A. Fuchs, 1870 † - (HYDROBIIDAE) (FOSSIL)
- archimedis, Pyrgulopsis archimedis S.S. Berry, 1947 - (HYDROBIIDAE)
- archimedis, Terebra archimedis G.P. Deshayes, 1859 - syn of: Terebra funiculata R.B. Hinds, 1844 - (TEREBRIDAE)
- archimedis, Archimediella archimedis (A. Brongniart, 1823) - (TURRITELLIDAE)
- archimedis, Turritella archimedis L.W. Dillwyn, 1817 - syn of: Turritella terebra (C. Linnaeus, 1758) - (TURRITELLIDAE)
- Archimiediella, syn of: Genus Archimediella F. Sacco, 1895 (TURRITELLIDAE)
- archimima, Bankia archimima T. Iredale, 1932 - syn of: Bankia australis (W.T. Calman, 1920) - (TEREDINIDAE)
- Archiminolia, Genus Archiminolia T. Iredale, 1929 (SOLARIELLIDAE)
- Archinacella, Genus Archinacella Ulrich & Scofield, 1897 † (ARCHINACELLIDAE) (FOSSIL)
- ARCHINACELLIDAE Knight, 1952 † - Family (MONOPLACOPHORA-ARCHINACELLIDA [Order]-ARCHINACELLOIDEA [Superfamily]) (FOSSIL)
- Archinacellina, Genus Archinacellina Horný , 1961 † (TRYBLIDIIDAE) (FOSSIL)
- Archinacellopsis, Genus Archinacellopsis Horný, 1963 † (ARCHINACELLIDAE) (FOSSIL)
- Archiparreysia, Genus Archiparreysia H. Modell, 1964 (UNIONIDAE)
- archipatagonica, Urosalpinx archipatagonica H.F.A. von Ihering, 1907 † - (MURICIDAE) (FOSSIL)
- archipelagica, Cerithium lividulum archipelagica A. Gaglini, 1992 - (CERITHIIDAE)
- Archipelagica, syn of: Genus Albinaria W. von Vest, 1867 (CLAUSILIIDAE)
- archiperipheras, Anasibirites archiperipheras Bando, 1964 † - (MELAGATHICERATIDAE) (FOSSIL)
- Archiphysa, Genus Archiphysa J.D. Taylor, 2003 (PHYSIDAE)
- archipovi, Neobakevellia archipovi Truschelev, 1996 † - (BAKEVELLIIDAE) (FOSSIL)
- archiskanni, Modiolus archiskanni McLearn, 1945 † - (MYTILIDAE) (FOSSIL)
- architae, Pseudotorinia architae (O.G. Costa, 1841) - (ARCHITECTONICIDAE)
- architae cristallina, Pseudotorinia architae cristallina (G.W. Nowell-Usticke, 1969) - (ARCHITECTONICIDAE)
- architae retifera, Pseudotorinia architae retifera (W.H. Dall, 1892) - (ARCHITECTONICIDAE)
- Architae-group, syn of: Genus Pseudotorinia F. Sacco, 1892 (ARCHITECTONICIDAE)
- architalassus, Conus architalassus J. Lightfoot, 1786 - syn of: Leptoconus ammiralis (C. Linnaeus, 1758) - (CONIDAE)
- Architea, Genus Architea A. da Costa, 1869 (POMATIIDAE)
- Architeconica, syn of: Genus Architectonica P.F. Röding, 1798 (ARCHITECTONICIDAE)
- Architectoma, syn of: Genus Architectonica P.F. Röding, 1798 (ARCHITECTONICIDAE)
- Architectonia, syn of: Genus Architectonica P.F. Röding, 1798 (ARCHITECTONICIDAE)
- Architectonica, Genus Architectonica P.F. Röding, 1798 (ARCHITECTONICIDAE)
- architectonica, Diplopoma architectonica (J. Gundlach in L. Pfeiffer, 1859) - (POMATIIDAE)
- architectonica aguayoi, Diplopoma architectonica aguayoi M.I. Sánchez Roig, 1951 - (POMATIIDAE)
- architectonica libanoensis, Diplopoma architectonica libanoensis (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- architectonica tanamensis, Diplopoma architectonica tanamensis (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- ARCHITECTONICIDAE J.E. Gray, 1850 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-ARCHITECTONICOIDEA [Superfamily])
- architectonicus, Tectus architectonicus (A. Adams, 1853) - (TEGULIDAE)
- Architectonium, syn of: Genus Architectonica P.F. Röding, 1798 (ARCHITECTONICIDAE)
- ARCHITEUTHIDAE Pfeffer, 1900 - Family (CEPHALOPODA-COLEOIDEA [Subclass]-DECAPODIFORMES [Superorder]-OEGOPSIDA [Order])
- Architeuthis, Genus Architeuthis J.J.S. Steenstrup, 1857 in Harting, 1860 (ARCHITEUTHIDAE)
- Architeuthus, syn of: Genus Architeuthis J.J.S. Steenstrup, 1857 in Harting, 1860 (ARCHITEUTHIDAE)
- archithalassius, Conus archithalassius J.H.F. Link, 1807 - syn of: Kalloconus pulcher (J. Lightfoot, 1786) - (CONIDAE)
- archithalassus, Conus archithalassus P.F. Röding, 1798 - syn of: Kalloconus pulcher (J. Lightfoot, 1786) - (CONIDAE)
- Archivesica, Subgenus Calyptogena (Archivesica) W.H. Dall, 1908 (VESICOMYIDAE)
- Archivolva, Genus Archivolva F.Jr. Lorenz & D. Fehse, 2009 (OVULIDAE)
- Archminolia, syn of: Genus Archiminolia T. Iredale, 1929 (SOLARIELLIDAE)
- Archoceras, Genus Archoceras Schindewolf , 1937 † (GEPHUROCERATIDAE) (FOSSIL)
- archon, Tenorioconus archon (W.J. Broderip, 1833) - (CONIDAE)
- archon, Plagiothyra archon (Whidborne, 1889 †) - (PLAGIOTHYRIDAE) (FOSSIL)
- archon, Monodonta archon Whidborne, 1889 † - syn of: Plagiothyra archon (Whidborne, 1889 †) - (TROCHIDAE) (FOSSIL)
- Archonta, syn of: Genus Cavolinia P.C. Abildgaard, 1791 (CAVOLINIIDAE)
- Archytaea, syn of: Genus Architea A. da Costa, 1869 (POMATIIDAE)
- arci, Eubranchus arci J.A. Ortea, 1981 - (EUBRANCHIDAE)
- Arcicardium, Genus Arcicardium Fischer, 1887 † (BIVALVIA INCERTAE SEDIS) (FOSSIL)
- arcicostum, Stemmatoceras arcicostum Imlay, 1967 † - (STEPHANOCERATIDAE) (FOSSIL)
- ARCIDA (UNASSIGNED) - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-ARCIDA [Order]) (FOSSIL)
- ARCIDAE Lamarck, 1809 - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-ARCIDA [Order]-ARCOIDEA [Superfamily])
- arcidens, Pisidium arcidens L.V. Krivosheina, 1978 - syn of: Pisidium subtruncatum A.W. Malm, 1855 - (SPHAERIIDAE)
- Arcidens, Genus Arcidens C.T. Simpson, 1900 (UNIONIDAE)
- Arcidopsis, Genus Arcidopsis C.T. Simpson, 1900 (UNIONIDAE)
- arcifer, Toxamblyites arcifer Buckman, 1924 † - (HAPLOCERATIDAE) (FOSSIL)
- arcifera, Neritina arcifera O.A.L. Mörch, 1872 - (NERITIDAE)
- arciforme, Planctoceras arciforme Balaschov, 1953 † - syn of: Tragoceras falcatum (Schlotheim, 1820 †) - (ESTONIOCERATIDAE) (FOSSIL)
- arciformis, Malletia arciformis W.H. Dall, 1908 - (MALLETIIDAE)
- arciformis, Modiolus arciformis W.H. Dall, 1909 - syn of: Mytella charruana (A.V.M.D. D'Orbigny, 1842) - (MYTILIDAE)
- arcigerens, Granulomelon arcigerens (R. Tate, 1894) - (CAMAENIDAE)
- arcigerens, Pleuroxia arcigerens R. Tate, 1894 - syn of: Granulomelon arcigerens (R. Tate, 1894) - (CAMAENIDAE)
- arcina, Dolabra arcina L. Waagen, 1881 † - (MYOPHORICARDIIDAE) (FOSSIL)
- Arcinella, Genus Arcinella H.C.F. Schumacher, 1817 (CHAMIDAE)
- arcinella, Arcinella arcinella (C. Linnaeus, 1767) - (CHAMIDAE)
- arcinella, Arcinella arcinella (Linne 1767) † - (CHAMIDAE) (FOSSIL)
- arcinella, Chama arcinella C. Linnaeus, 1767 - syn of: Arcinella arcinella (C. Linnaeus, 1767) - (CHAMIDAE)
- arcinella, Actinella arcinella (R.T. Lowe, 1854) - (HYGROMIIDAE)
- arcinella californica, Arcinella arcinella californica W.H. Dall, 1903 - syn of: Arcinella californica W.H. Dall, 1903 - (CHAMIDAE)
- arcinella olssoni, Arcinella arcinella olssoni D. Nicol, 1952 - syn of: Arcinella californica W.H. Dall, 1903 - (CHAMIDAE)
- Arcinellina, syn of: Genus Saxicavella P. Fischer, 1878 (HIATELLIDAE)
- arcis, Limatula arcis C.A. Fleming, 1978 † - (LIMIDAE) (FOSSIL)
- arcisensis, Parachondria arcisensis Watters, 2016 - (POMATIIDAE)
- arcitenens, Graphoceras arcitenens Buckman † - (GRAPHOCERATIDAE) (FOSSIL)
- Arcobelus, syn of: Genus Nannobelus Pavlov, 1913 † (BELEMNITIDA (UNASSIGNED)) (FOSSIL)
- Arcochiton, Genus Arcochiton Hoare & Sturgeon, 1976 † (ACUTICHITONIDAE) (FOSSIL)
- arcodentiens, Tucetona arcodentiens (W.H. Dall, 1895) - (GLYCYMERIDIDAE)
- arcodentiens, Glycymeris arcodentiens W.H. Dall, 1895 - syn of: Tucetona arcodentiens (W.H. Dall, 1895) - (GLYCYMERIDIDAE)
- arcodes, Modiolopsis arcodes J.B.M. Dana, 1847 † - syn of: Merismopteria imbricata (J.B.M. Dana, 1847 †) - (MODIOMORPHIDAE) (FOSSIL)
- Arcodonta, Genus Arcodonta Cope, 1999 † (PRAENUCULIDAE) (FOSSIL)
- arcoida, Cuspidaria arcoida T.A. Okutani & R. Kawamura, 2002 - (CUSPIDARIIDAE)
- Arcomya, Genus Arcomya Agassiz, 1838 † (PHOLADOMYIDAE) (FOSSIL)
- Arcomytilus, Genus Arcomytilus Agassiz , 1843 † (MYTILIDAE) (FOSSIL)
- arconadae, Guadiella arconadae (H.D. Boeters, 2003) - (HYDROBIIDAE)
- Arconaia, Genus Arconaia T.A. Conrad, 1865 (UNIONIDAE)
- arconatii, Emarginula arconatii A. Issel, 1869 - (FISSURELLIDAE)
- Arcopagella, Genus Arcopagella Meek, 1871 † (TELLINIDAE) (FOSSIL)
- Arcopagia, Genus Arcopagia W.E. Leach in T. Brown, 1827 (TELLINIDAE)
- Arcopaginula, Genus Arcopaginula Lamy, 1918 † (TELLINIDAE) (FOSSIL)
- Arcopaginula, syn of: Genus Tellina C. Linnaeus, 1758 (TELLINIDAE)
- Arcopagiopsis, Subgenus Arcopagia (Arcopagiopsis) A.E.M. Cossmann, 1886 † (TELLINIDAE) (FOSSIL)
- Arcopella, syn of: Genus Arcopagia W.E. Leach in T. Brown, 1827 (TELLINIDAE)
- Arcoperna, Genus Arcoperna Conrad, 1865 † (MYTILIDAE) (FOSSIL)
- Arcopsis, Genus Arcopsis A. von Koenen, 1885 (NOETIIDAE)
- Arcopta, syn of: Genus Arca C. Linnaeus, 1758 (ARCIDAE)
- Arcoptera, syn of: Genus Arca C. Linnaeus, 1758 (ARCIDAE)
- arcotensis, Trochus arcotensis E. Forbes, 1846 - (TROCHIDAE)
- arcotensis, Venus arcotensis E. Forbes, 1846 - (VENERIDAE)
- Arcotia, syn of: Genus Mesalia J.E. Gray, 1847 (TURRITELLIDAE)
- arcotinum, Dentalium arcotinum E. Forbes, 1846 - (DENTALIIDAE)
- Arcritopaphia, syn of: Genus Paphia P.F. Röding, 1798 (VENERIDAE)
- arcta, Mitrella arcta K. Monsecour & D. Monsecour, 2016 - (COLUMBELLIDAE)
- arcta, Gryphaea arcta A. Braun, 1841 † - (GRYPHAEIDAE) (FOSSIL)
- arcta, Actinella arcta (R.T. Lowe, 1831) - (HYGROMIIDAE)
- arcta, Erycina arcta G.P. Deshayes, 1858 † - (LASAEIDAE) (FOSSIL)
- arcta, Nerita arcta J.B. Hombron & C.H. Jacquinot, 1854 - syn of: Nerita insculpta C.A. Récluz, 1841 - (NERITIDAE)
- arcta, Eulimella arcta A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- arcta, Daphnella arcta (E.A. Smith, 1884) - (RAPHITOMIDAE)
- arcta, Pleurotoma arcta E.A. Smith, 1884 - syn of: Daphnella arcta (E.A. Smith, 1884) - (TURRIDAE)
- Arctadalaria, syn of: Genus Onchidoris H.M.D. De Blainville, 1816 (ONCHIDORIDIDAE)
- arctata, Polymesoda arctata (G.P. Deshayes, 1854) - (CYRENIDAE)
- arctata, Glycymeris arctata T.A. Conrad, 1848 † - (GLYCYMERIDIDAE) (FOSSIL)
- arctata, Mactra arctata T.A. Conrad, 1831 - syn of: Mesodesma arctatum (T.A. Conrad, 1831) - (MACTRIDAE)
- arctata, Pterygia arctata (G.B. II Sowerby, 1874) - (MITRIDAE)
- arctata, Oliva arctata F.P. Marrat, 1870 - syn of: Oliva pacifica F.P. Marrat, 1870 - (OLIVIDAE)
- arctata, Berthella arctata J.M. Pacaud, 2015 - (PLEUROBRANCHIDAE)
- arctata, Daphnella arctata L.A. Reeve, 1845 - syn of: Daphnella sigmastoma C. Hedley, 1922 - (RAPHITOMIDAE)
- arctata, Daphnella arctata J.W. Brazier, 1876 - syn of: Daphnella sigmastoma C. Hedley, 1922 - (RAPHITOMIDAE)
- arctata, Ringicula arctata A.A. Gould, 1860 - (RINGICULIDAE)
- arctata, Solecurtus arctata Dufour, 1881 † - (SOLECURTIDAE) (FOSSIL)
- arctata, Psammacoma arctata (T.A. Conrad, 1849 †) - (TELLINIDAE) (FOSSIL)
- arctata, Elliptio arctata T.A. Conrad, 1834 - (UNIONIDAE)
- arctatoides, Ringicula arctatoides Martin, 1879 † - (RINGICULIDAE) (FOSSIL)
- arctatum, Mesodesma arctatum (T.A. Conrad, 1831) - (MESODESMATIDAE)
- arctatum, Globonema arctatum (Ulrich & Scofield, 1897 †) - (TROCHONEMATIDAE) (FOSSIL)
- arctatus, Inquisitor arctatus R.N. Kilburn, 1988 - (PSEUDOMELATOMIDAE)
- arctatus, Versutaxis arctatus (H.B. Baker, 1940) - (SPIRAXIDAE)
- arctatus, Unio arctatus A.E.J. Férussac, 1835 - syn of: Elliptio dilatata C.S. Rafinesque, 1820 - (UNIONIDAE)
- arctecostata, Loxonema arctecostata Münster, 1841 † - syn of: Zygopleura arctecostata (Münster, 1841 †) - (LOXONEMATIDAE) (FOSSIL)
- arctecostata, Fossarus arctecostata Klipstein, 1843 † - (PLANAXIDAE) (FOSSIL)
- arctecostata, Turritella arctecostata Münster, 1841 † - syn of: Zygopleura arctecostata (Münster, 1841 †) - (TURRITELLIDAE) (FOSSIL)
- arctecostata, Zygopleura arctecostata (Münster, 1841 †) - (ZYGOPLEURIDAE) (FOSSIL)
- arctelirata, Linopyrga arctelirata (L. de Folin & J.P.L. Périer, 1879) - (PYRAMIDELLIDAE)
- arctespira, Granaria arctespira É.A.A. Locard, 1894 - syn of: Granaria variabilis (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- arctespira, Imparietula blanda arctespira (A. Mousson, 1874) - (ENIDAE)
- arctespirata, Lissachatina craveni arctespirata (J.R. Bourguignat, 1889) - (ACHATINIDAE)
- Arcteuglesa, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- Arcthoplites, Genus Arcthoplites Nagy, 1970 † (HOPLITIDAE) (FOSSIL)
- Arctica, Genus Arctica H.C.F. Schumacher, 1817 (ARCTICIDAE)
- arctica, Argonauta arctica O. Fabricius, 1780 - syn of: Limacina helicina (C.J. Phipps, 1774) - (ARGONAUTIDAE)
- arctica, Astarte arctica (J.E. Gray, 1824) - (ASTARTIDAE)
- arctica, Maizuria arctica (Kiparisova, 1937 †) - (BAKEVELLIIDAE) (FOSSIL)
- arctica, Admete arctica A.T. von Middendorff, 1849 - syn of: Neoiphinoe arctica (A.T. von Middendorff, 1849) - (CANCELLARIIDAE)
- arctica, Neoiphinoe arctica (A.T. von Middendorff, 1849) - (CAPULIDAE)
- arctica, Cuspidaria arctica (G.O. Sars, 1859) - (CUSPIDARIIDAE)
- arctica, Cypraea arctica R. Pulteney, 1799 - syn of: Trivia arctica (R. Pulteney, 1799) - (CYPRAEIDAE)
- arctica, Cyrtoclymenia involuta arctica Nalivkina, 1936 † - (CYRTOCLYMENIIDAE) (FOSSIL)
- arctica, Cyrtorostra arctica Logan, 1970 † - syn of: Cyrtorostra laticostata (Nechaev, 1894 †) - (DELTOPECTINIDAE) (FOSSIL)
- arctica, Nematomenia arctica K.H.J. Thiele, 1913 - (DONDERSIIDAE)
- arctica, Scalaria arctica H.J. Posselt & A.S. Jensen, 1898 - syn of: Acirsa borealis (C. Lyell, 1841) - (EPITONIIDAE)
- arctica, Eoangyomphalus arctica Blodgett & Johnson, 1992 † - (GOSSELETINIDAE) (FOSSIL)
- arctica, Celox arctica Shimanskiy, 1967 † - (GZHELOCERATIDAE) (FOSSIL)
- arctica, Hiatella arctica (C. Linnaeus, 1767) - (HIATELLIDAE)
- arctica, Panomya arctica J.B.P.A. Lamarck, 1818 - syn of: Panomya norvegica (L. Spengler, 1793) - (HIATELLIDAE)
- arctica, Holopea arctica Schuchert, 1900 † - (HOLOPEIDAE) (FOSSIL)
- arctica, Spiratella arctica G.P. Deshayes, 1832 - syn of: Limacina helicina (C.J. Phipps, 1774) - (LIMACINIDAE)
- arctica, Lacuna arctica R.A. Philippi, 1853 - syn of: Lacuna vincta (G. Montagu, 1803) - (LITTORINIDAE)
- arctica, Littorina arctica H.P.C. Møller, 1842 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- arctica, Littorina arctica G.O. Sars, 1851 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- arctica, Lophospira arctica Tolmachoff, 1930 † - syn of: Murchisonia arctica (Tolmachoff, 1930 †) - (LOPHOSPIRIDAE) (FOSSIL)
- arctica, Stagnicola arctica (I. Lea, 1864) - (LYMNAEIDAE)
- arctica, Lyonsia arctica O.A.L. Mörch, 1868 - syn of: Lyonsia arenosa (H.P.C. Møller, 1842) - (LYONSIIDAE)
- arctica, Palaeoneilo arctica Muromtseva, 1981 † - (MALLETIIDAE) (FOSSIL)
- arctica, Propebela arctica (A. Adams, 1855) - (MANGELIIDAE)
- arctica, Margarites arctica W.E. Leach, 1819 - syn of: Margarites helicinus (C.J. Phipps, 1774) - (MARGARITIDAE)
- arctica, Murchisonia arctica (Tolmachoff, 1930 †) - (MURCHISONIIDAE) (FOSSIL)
- arctica, Mya arctica C. Linnaeus, 1767 - syn of: Hiatella arctica (C. Linnaeus, 1767) - (MYIDAE)
- arctica, Crenella arctica W.E. Leach in A. Ross, 1819 - syn of: Arvella faba (O.F. Müller, 1776) - (MYTILIDAE)
- arctica, Eumetula arctica (O.A.L. Mörch, 1857) - (NEWTONIELLIDAE)
- arctica, Nucula arctica W.J. Broderip & G.B. I Sowerby, 1829 - syn of: Yoldia seminuda W.H. Dall, 1871 - (NUCULIDAE)
- arctica, Nucula arctica J.E. Gray, 1824 - syn of: Portlandia arctica (Gray, 1824) - (NUCULIDAE)
- arctica, Pandora arctica W.H. Dall, 1903 † - (PANDORIDAE) (FOSSIL)
- arctica, Goniomya arctica Sokolov & Bodylevsky, 1931 † - syn of: Goniomya literata (Sowerby, 1819 †) - (PHOLADOMYIDAE) (FOSSIL)
- arctica, Pleurotomaria arctica F. Toula, 1875 † - (PLEUROTOMARIIDAE) (FOSSIL)
- arctica, Aartsenia arctica (W.H. Dall & P. Bartsch, 1909) - (PYRAMIDELLIDAE)
- arctica, Onoba arctica S.L. Lovén, 1846 - syn of: Onoba aculeus (Gould, 1841) - (RISSOIDAE)
- arctica, Rissoa arctica S.L. Lovén, 1846 - syn of: Onoba aculeus (Gould, 1841) - (RISSOIDAE)
- arctica, Trivia arctica (R. Pulteney, 1799) - (TRIVIIDAE)
- arctica, Tryblidium arctica C.M. Poulsen, 1974 † - (TRYBLIDIIDAE) (FOSSIL)
- arctica, Lora arctica A. Adams, 1855 - syn of: Propebela arctica (A. Adams, 1855) - (TURRIDAE)
- arctica, Tapes arctica L.A. Reeve, 1864 - syn of: Liocyma fluctuosa (A.A. Gould, 1841) - (VENERIDAE)
- arctica, Vertigo arctica C. de Wallenberg, 1858 - syn of: Isthmia modesta arctica C. de Wallenberg, 1858 - (VERTIGINIDAE)
- arctica, Isthmia modesta arctica C. de Wallenberg, 1858 - (VERTIGINIDAE)
- arctica, Archivesica arctica M. Hansen & al., 2017 † - (VESICOMYIDAE) (FOSSIL)
- arctica, Eotebenna arctica Peel, 1989 † - (YOCHELCIONELLIDAE) (FOSSIL)
- arctica, Portlandia arctica (Gray, 1824) - (YOLDIIDAE)
- arctica, Portlandia arctica Messjatsev, 1931 - syn of: Yoldiella lenticula (H.P.C. Møller, 1842) - (YOLDIIDAE)
- arctica abbreviata, Hiatella arctica abbreviata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1896 - syn of: Hiatella arctica (C. Linnaeus, 1767) - (HIATELLIDAE)
- arctica aestuariorum, Portlandia arctica aestuariorum Mosevich, 1928 - syn of: Portlandia aestuariorum (Mosevich, 1928) - (YOLDIIDAE)
- arctica angulata, Littorina arctica angulata G.O. Sars, 1851 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- arctica awana, Hiatella arctica awana (M. Yokoyama, 1924) - (HIATELLIDAE)
- arctica burdigalensis, Trivia arctica burdigalensis (A.V.M.D. D'Orbigny, 1852 †) - (TRIVIIDAE) (FOSSIL)
- arctica canariensis, Trivia arctica canariensis F. Settepassi, 1977 - syn of: Trivia arctica (R. Pulteney, 1799) - (TRIVIIDAE)
- arctica dilatata, Hiatella arctica dilatata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1896 - syn of: Hiatella arctica (C. Linnaeus, 1767) - (HIATELLIDAE)
- arctica elatior, Littorina arctica elatior G.O. Sars, 1851 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- arctica eliator, Littorina arctica eliator G.O. Sars, 1851 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- arctica extima, Pupilla arctica extima C.A. Westerlund, 1876 - syn of: Isthmia modesta (T. Say, 1824) - (PUPILLIDAE)
- arctica extima, Vertigo arctica extima C.A. Westerlund, 1876 - syn of: Isthmia extima (C.A. Westerlund, 1877) - (VERTIGINIDAE)
- arctica flaccida, Hiatella arctica flaccida A.A. Gould, 1861 - (HIATELLIDAE)
- arctica inermis, Hiatella arctica inermis M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1896 - syn of: Hiatella arctica (C. Linnaeus, 1767) - (HIATELLIDAE)
- arctica inflata, Yoldia arctica inflata W. Leche, 1883 - syn of: Portlandia arctica (Gray, 1824) - (YOLDIIDAE)
- arctica nux, Yoldia arctica nux W.C. Brøgger, 1900 - syn of: Portlandia arctica (Gray, 1824) - (YOLDIIDAE)
- arctica orientalis, Hiatella arctica orientalis M. Yokoyama, 1920 - (HIATELLIDAE)
- arctica ovata, Yoldia arctica ovata Mosevich, 1928 - syn of: Portlandia arctica (Gray, 1824) - (YOLDIIDAE)
- arctica retusa, Littorina arctica retusa H.P.C. Møller, 1842 - syn of: Littorina fabalis (W. Turton, 1825) - (LITTORINIDAE)
- arctica rugosa, Hiatella arctica rugosa (C. Linnaeus, 1767) - syn of: Hiatella arctica orientalis - (HIATELLIDAE)
- arctica spinifera, Hiatella arctica spinifera G.B. Sowerby, 1875 - (HIATELLIDAE)
- arctica turgida, Panomya arctica turgida W.H. Dall, 1916 - syn of: Panomya norvegica (L. Spengler, 1793) - (HIATELLIDAE)
- arctica typica, Portlandia arctica typica Z.A. Filatova, 1951 - syn of: Portlandia arctica (Gray, 1824) - (YOLDIIDAE)
- arcticameratum, Galtoceras arcticameratum (J.W. Hall, 1852 †) - (ACLEISTOCERATIDAE) (FOSSIL)
- Arcticeramus, Genus Arcticeramus Koschelkina, 1963 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- ARCTICIDAE Newton, 1891 (1844) - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-VENERIDA [Order]-ARCTICOIDEA [Superfamily])
- Arcticlam, Genus Arcticlam Marincovich Jr., 1993 † (MODIOMORPHIDAE) (FOSSIL)
- Arcticoceras, Genus Arcticoceras Spath, 1924 † (CADOCERATIDAE) (FOSSIL)
- arcticoronata, Wrightudora arcticoronata (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- arcticum, Tropaeum arcticum (Stolley, 1911 †) - (ANCYLOCERATIDAE) (FOSSIL)
- arcticum, Clinocardium arcticum G.B. II Sowerby, 1841 - syn of: Ciliatocardium ciliatum (O. Fabricius, 1780) - (CARDIIDAE)
- arcticum, Cerithium arcticum O.A.L. Mörch, 1857 - syn of: Eumetula arctica (O.A.L. Mörch, 1857) - (CERITHIIDAE)
- arcticum, Cravenoceras arcticum Librovitch, 1938 † - (CRAVENOCERATIDAE) (FOSSIL)
- arcticum, Crioceras arcticum Stolley, 1911 † - syn of: Tropaeum arcticum (Stolley, 1911 †) - (CRIOCERATITIDAE) (FOSSIL)
- arcticum, Kotelnyoceras arcticum I. Balashov, 1975 † - (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- arcticum, Calygirtyoceras arcticum (W.J. Gordon, 1957 †) - (GIRTYOCERATIDAE) (FOSSIL)
- arcticum, Syngastrioceras arcticum Nassichuk 1975 † - (GLAPHYRITIDAE) (FOSSIL)
- arcticum, Kionoceras arcticum Balaschov, 1959 † - (KIONOCERATIDAE) (FOSSIL)
- arcticum, Metalegoceras arcticum (Bogoslovskaya, 1982 †) - (METALEGOCERATIDAE) (FOSSIL)
- arcticum, Parametalegoceras arcticum Bogoslovskaya, 1982 † - syn of: Metalegoceras arcticum (Bogoslovskaya, 1982 †) - (METALEGOCERATIDAE) (FOSSIL)
- arcticum, Offleyoceras arcticum Foord † - (OFFLEYOCERATIDAE) (FOSSIL)
- arcticum, Orthoceras arcticum Foord † - syn of: Offleyoceras arcticum Foord † - (ORTHOCERATIDAE) (FOSSIL)
- arcticum, Pristiloma arcticum (M. Lehnert, 1884) - (PRISTILOMATIDAE)
- arcticum, Pristiloma arcticum I.M. Likharev, 1963 - syn of: Pristiloma japonica H.A. Pilsbry & Y. Hirase, 1903 - (PRISTILOMATIDAE)
- arcticum, Pisidium arcticum C.A. Westerlund, 1883 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- arcticus, Bathypolypus arcticus (V. Prosch, 1849) - (BATHYPOLYPODIDAE)
- arcticus, Pleurofrechites arcticus (Mojsisovics, 1886 †) - (BEYRICHITIDAE) (FOSSIL)
- arcticus, Plicifusus arcticus R.A. Philippi, 1850 - syn of: Plicifusus kroeyeri (H.P.C. Møller, 1842) - (BUCCINIDAE)
- arcticus, Dendronotus arcticus Korshunova, Sanamyan, Zimina, Fletcher & Martynov, 2016 - (DENDRONOTIDAE)
- arcticus, Fusus arcticus R.A. Philippi, 1850 - syn of: Plicifusus kroeyeri (H.P.C. Møller, 1842) - (FASCIOLARIIDAE)
- arcticus, Pseudogastroplites arcticus Jeletzky, 1980 † - (HOPLITIDAE) (FOSSIL)
- arcticus, Leptochiton arcticus (G.O. Sars, 1878) - (LEPTOCHITONIDAE)
- arcticus, Zenoites arcticus Tozer, 1965 † - (MELAGATHICERATIDAE) (FOSSIL)
- arcticus, Armiger arcticus O.A.L. Mörch - syn of: Gyraulus crista (C. Linnaeus, 1758) - (PLANORBIDAE)
- arcticus, Syringonautilus arcticus E.S. Sobolev, 1998 † - (SYRINGONAUTILIDAE) (FOSSIL)
- arcticus, Tractabilis arcticus Lyashenko, 1969 † - (TENTACULITIDAE) (FOSSIL)
- arcticus, Paratropites arcticus Tozer, 1994 † - (TROPITIDAE) (FOSSIL)
- arcticus proschi, Bathypolypus arcticus proschi B.W. Myers & A. D'Attilio, 1990 - (BATHYPOLYPODIDAE)
- Arctinula, syn of: Genus Similipecten R. Winckworth, 1932 (PROPEAMUSSIIDAE)
- arctior, Unio arctior I. Lea, 1838 - syn of: Elliptio dilatata C.S. Rafinesque, 1820 - (UNIONIDAE)
- arctior fisheropsis, Unio arctior fisheropsis A. De Gregorio, 1914 - syn of: Elliptio lanceolata I. Lea, 1827 - (UNIONIDAE)
- arctispira, Amphidoxa arctispira (L. Pfeiffer, 1846) - (CHAROPIDAE)
- arctispira, Coelocentrum arctispira (L. Pfeiffer, 1860) - (UROCOPTIDAE)
- arctispira estefaniae, Coelocentrum arctispira estefaniae H.A. Pilsbry, 1902 - (UROCOPTIDAE)
- arctispirale, Opeas arctispirale (P.V. Gredler, 1887) - (SUBULINIDAE)
- arctispirus, Microceramus concisus arctispirus (C.M.F. Ancey) - (UROCOPTIDAE)
- arctistria, Eurycampta arctistria (L. Pfeiffer, 1865) - (CEPOLIDAE)
- arctisulcatus, Aviculopecten arctisulcatus Newell, 1938 † - (AVICULOPECTINIDAE) (FOSSIL)
- Arctites, Genus Arctites Lyashenko, 1969 † (VOLYNITIDAE) (FOSSIL)
- Arctoa, syn of: Genus Dosinia J.A. Scopoli, 1777 (VENERIDAE)
- Arctoarpadites, Genus Arctoarpadites Tozer , 1994 † (TRACHYCERATIDAE) (FOSSIL)
- Arctocardinia, Genus Arctocardinia Kurushin, 1998 † (CARDINIIDAE) (FOSSIL)
- Arctocephalites, Genus Arctocephalites Imlay, 1962 † (CADOCERATIDAE) (FOSSIL)
- Arctoceras, Genus Arctoceras Hyatt , 1900 † (ARCTOCERATIDAE) (FOSSIL)
- ARCTOCERATIDAE Arthaber, 1911 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-MEEKOCERATOIDEA [Superfamily]) (FOSSIL)
- Arctoe, syn of: Genus Dosinia J.A. Scopoli, 1777 (VENERIDAE)
- Arctogymnites, Genus Arctogymnites Popov , 1962 † (BEYRICHITIDAE) (FOSSIL)
- Arctohungarites, Genus Arctohungarites Diener , 1916 † (LONGOBARDITIDAE) (FOSSIL)
- Arctoleura, Genus Arctoleura N.H. Odhner in A. Franc, 1968 (ARMINIDAE)
- Arctolimax, syn of: Genus Deroceras C.S. Rafinesque, 1820 (AGRIOLIMACIDAE)
- Arctoliva, Subgenus Oliva (Arctoliva) E.J. Petuch & D.M. Sargent, 1986 (OLIVIDAE)
- Arctomeekoceras, Genus Arctomeekoceras Tozer, 1994 † (PROPTYCHITIDAE) (FOSSIL)
- Arctomelon, Genus Arctomelon W.H. Dall, 1915 (VOLUTIDAE)
- Arctomercaticeras, Genus Arctomercaticeras Repin, 1968 † (HILDOCERATIDAE) (FOSSIL)
- Arctomphalus, syn of: Genus Omphalocirrus de Ryckholt, 1860 † (OMPHALOCIRRIDAE) (FOSSIL)
- Arctomyalina, Genus Arctomyalina Logan, 1970 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- Arctomytiloides, Genus Arctomytiloides Polubotko, 1992 † (INOCERAMIDAE) (FOSSIL)
- Arctonautilus, Genus Arctonautilus Sobolev , 1989 † (PROPTYCHITIDAE) (FOSSIL)
- Arctonchis, syn of: Genus Onchidella J.E. Gray, 1850 (ONCHIDIIDAE)
- Arctonia, syn of: Genus Frigidoalvania A. Warén, 1974 (RISSOIDAE)
- Arctoplax, Genus Arctoplax Cherns , 1998 † (OCHMAZOCHITONIDAE) (FOSSIL)
- arctoplicata, Eopleurotoma arctoplicata Staadt in A.E.M. Cossmann, 1913 † - (TURRIDAE) (FOSSIL)
- Arctopratulum, Subgenus Nemocardium (Arctopratulum) Keen, 1954 † (CARDIIDAE) (FOSSIL)
- Arctoprionites, Genus Arctoprionites Zakharov, 1978 † (SIBIRITIDAE) (FOSSIL)
- Arctoptychites, Genus Arctoptychites Archipov & al., 1974 † (PTYCHITIDAE) (FOSSIL)
- Arctoscala, syn of: Genus Epitonium P.F. Röding, 1798 (EPITONIIDAE)
- Arctosepia, syn of: Subgenus Sepia (Doratosepion) A. de Rochebrune, 1884 (SEPIIDAE)
- Arctosirenites, Genus Arctosirenites Tozer , 1961 † (TRACHYCERATIDAE) (FOSSIL)
- Arctostrea, Genus Arctostrea Pervinquiére, 1910 † (ARCTOSTREIDAE) (FOSSIL)
- ARCTOSTREIDAE Vialov, 1983 † - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-OSTREIDA [Order]-OSTREOIDEA [Superfamily]) (FOSSIL)
- Arctoteuthis, Subgenus Cylindroteuthis (Arctoteuthis) Saks & Nalnyaeva, 1964 † (CYLINDROTEUTHIDIDAE) (FOSSIL)
- Arctotirolites, Genus Arctotirolites Popov, 1963 † (XENODISCIDAE) (FOSSIL)
- Arctotis, Genus Arctotis Bodylevsky, 1960 † (OXYTOMIDAE) (FOSSIL)
- Arctotropites, Genus Arctotropites Tozer, 1994 † (TROPITIDAE) (FOSSIL)
- Arctozone, Genus Arctozone Frýda & Blodgett, 2004 † (GOSSELETINIDAE) (FOSSIL)
- arctuata, Cyrtopleura arctuata (Conrad) † - (PHOLADIDAE) (FOSSIL)
- arctuatum, Discoceras arctuatum (Lossen, 1860 †) - (DISCOCERATIDAE) (FOSSIL)
- arctum, Bittium arctum J.B. Hombron & C.H. Jacquinot, 1852 - (CERITHIIDAE)
- arctum, Oxynoticeras arctum C.T. Simpson, 1843 † - (OXYNOTICERATIDAE) (FOSSIL)
- arctum, Dimorphotoceras arctum McLearn, 1940 † - (TIBETITIDAE) (FOSSIL)
- arctura, Polidevcia arctura Yancey, 1978 † - (NUCULANIDAE) (FOSSIL)
- Arcturella, syn of: Genus Arcturellina A.L. Chavan, 1951 (CARDITIDAE)
- Arcturellina, Genus Arcturellina A.L. Chavan, 1951 (CARDITIDAE)
- arcturi, Histioteuthis arcturi (G.C. Robson, 1948) - (HISTIOTEUTHIDAE)
- Arcturus, syn of: Genus Cyclocardia T.A. Conrad, 1867 (CARDITIDAE)
- arcturus, Leptomphalus arcturus Yancey, 1969 † - (EUOMPHALIDAE) (FOSSIL)
- arcturus, Calstevenus arcturus Yancey, 1973 † - (GADILIDAE) (FOSSIL)
- arctus, Gadila arctus (J. Henderson, 1920) - (GADILIDAE)
- arctus, Homoctenus arctus Li, 1995 † - (HOMOCTENIDAE) (FOSSIL)
- arcua, Proplina arcua Stinchcomb, 1986 † - (TRYBLIDIIDAE) (FOSSIL)
- arcuacheilos, Antarctohoges arcuacheilos J.D. Stilwell & Zinsmeister, 1992 † - (APORRHAIDAE) (FOSSIL)
- arcuanotum, Actinoceras arcuanotum Flower, 1943 † - (ACTINOCERATIDAE) (FOSSIL)
- arcuata, Acanthomenia arcuata A.H. Scheltema, 1999 - (ACANTHOMENIIDAE)
- arcuata, Pyreneola arcuata (W.H. Turton, 1932) - (COLUMBELLIDAE)
- arcuata, Conasprella arcuata (W.J. Broderip & G.B. I Sowerby, 1829) - (CONIDAE)
- arcuata, Kohniconus arcuata (W.J. Broderip & G.B. I Sowerby, 1829) - syn of: Conasprella arcuata (W.J. Broderip & G.B. I Sowerby, 1829) - (CONIDAE)
- arcuata, Latouchella arcuata Gubanov & al., 2004 † - (COREOSPIRIDAE) (FOSSIL)
- arcuata, Cuspidaria arcuata (W.H. Dall, 1881) - (CUSPIDARIIDAE)
- arcuata, Neaera arcuata W.H. Dall, 1881 - syn of: Cuspidaria arcuata (W.H. Dall, 1881) - (CUSPIDARIIDAE)
- arcuata, Cruziturricula arcuata (L.A. Reeve, 1843) - (DRILLIIDAE)
- arcuata, Vitreolina arcuata (Adams, 1850) - (EULIMIDAE)
- arcuata, Eulima arcuata G.P. Deshayes, 1850 - (EULIMIDAE)
- arcuata, Eulima arcuata G.B. II Sowerby, 1865 - syn of: Melanella dufresnii T.E. Bowdich, 1832 - (EULIMIDAE)
- arcuata, Balcis arcuata Adams, 1850 - syn of: Vitreolina arcuata (Adams, 1850) - (EULIMIDAE)
- arcuata, Diodora arcuata (G.B. II Sowerby, 1862) - (FISSURELLIDAE)
- arcuata, Hindsiella arcuata (J.B.P.A. Lamarck, 1807 †) - (GALEOMMATIDAE) (FOSSIL)
- arcuata, Ludwigella arcuata Buckman, 1901 † - syn of: Graphoceras arcuatum (Buckman, 1901 †) - (GRAPHOCERATIDAE) (FOSSIL)
- arcuata, Gryphaea arcuata J.B.P.A. Lamarck, 1801 † - (GRYPHAEIDAE) (FOSSIL)
- arcuata, Cernuella arcuata W. Kobelt, 1878 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- arcuata, Limaria arcuata W.H. Turton, 1932 - (LIMIDAE)
- arcuata, Lima arcuata G.B. II Sowerby, 1843 - syn of: Limaria pacifica (A.V.M.D. D'Orbigny, 1846) - (LIMIDAE)
- arcuata, Pictetia arcuata M. Collignon, 1962 † - (LYTOCERATIDAE) (FOSSIL)
- arcuata, Spisula arcuata (Sowerby, 1817 †) - (MACTRIDAE) (FOSSIL)
- arcuata, Anatina arcuata E. Forbes, 1846 - (MACTRIDAE)
- arcuata, Lutraria arcuata L.A. Reeve, 1854 - syn of: Lutraria rhynchaena I.H. Jonas, 1844 - (MACTRIDAE)
- arcuata, Mactra arcuata Sowerby, 1817 † - syn of: Spisula arcuata (Sowerby, 1817 †) - (MACTRIDAE) (FOSSIL)
- arcuata, Serrata arcuata F. Boyer, 2008 - (MARGINELLIDAE)
- arcuata, Melanopsis arcuata Š. Brusina, 1878 † - (MELANOPSIDAE) (FOSSIL)
- arcuata, Walkeria arcuata S.S. Buckman, 1890 † - (MOLLUSCA INCERTAE SEDIS) (FOSSIL)
- arcuata, Koreamya arcuata (A. Adams, 1856) - (MONTACUTIDAE)
- arcuata, Botula arcuata H. Dufo, 1840 - syn of: Botula cinnamomeus (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- arcuata, Modiolaria arcuata A.A. Gould, 1861 - syn of: Gregariella barbata (L.A. Reeve, 1858) - (MYTILIDAE)
- arcuata, Portlandella arcuata (Pronina, 1969 †) - (NUCULANIDAE) (FOSSIL)
- arcuata, Leda arcuata G.B. I Sowerby, 1871 - syn of: Adrana crenifera (G.B. I Sowerby, 1833) - (NUCULANIDAE)
- arcuata, Euvaricella arcuata H.B. Baker, 1935 - (OLEACINIDAE)
- arcuata, Lytospira arcuata J. Perner, 1903 † - (OPHILETIDAE) (FOSSIL)
- arcuata, Simnia arcuata (L.A. Reeve, 1865) - (OVULIDAE)
- arcuata, Palaeozygopleura arcuata (Holzapfel, 1882 †) - (PALAEOZYGOPLEURIDAE) (FOSSIL)
- arcuata, Frenamya arcuata (G.B. I Sowerby, 1835) - (PANDORIDAE)
- arcuata, Pectinodonta arcuata W.H. Dall, 1882 - (PECTINODONTIDAE)
- arcuata, Pholas arcuata T.A. Conrad, 1841 † - (PHOLADIDAE) (FOSSIL)
- arcuata, Plesioteuthis arcuata Von der Marck, 1873 † - (PLESIOTEUTHIDIDAE) (FOSSIL)
- arcuata, Avicula arcuata Münster, 1841 † - (PTERIIDAE) (FOSSIL)
- arcuata, Egila arcuata C.R. Laws, 1941 † - (PYRAMIDELLIDAE) (FOSSIL)
- arcuata, Turbonilla arcuata (S. Nomura, 1936) - (PYRAMIDELLIDAE)
- arcuata, Evalea arcuata (C.B. Adams, 1860) - (PYRAMIDELLIDAE)
- arcuata, Chemnitzia arcuata S. Nomura, 1936 - syn of: Turbonilla arcuata (S. Nomura, 1936) - (PYRAMIDELLIDAE)
- arcuata, Pseudosubulina arcuata (H.B. Baker, 1939) - (SPIRAXIDAE)
- arcuata, Anodonta arcuata F. Cailliaud, 1823 - syn of: Chambardia rubens (J.B.P.A. Lamarck, 1819) - (UNIONIDAE)
- arcuata, Autocoptis arcuata (C.D. Weinland & E.C. Von Martens, 1859) - (UROCOPTIDAE)
- arcuata, Petricola arcuata G.P. Deshayes, 1839 - syn of: Petricola carditoides (T.A. Conrad, 1837) - (VENERIDAE)
- arcuata, Portlandia arcuata Pronina, 1969 † - syn of: Portlandella arcuata (Pronina, 1969 †) - (YOLDIIDAE) (FOSSIL)
- arcuata paradisi, Euvaricella arcuata paradisi H.B. Baker, 1935 - (OLEACINIDAE)
- arcuataeformis, Gryphaea arcuataeformis Kiparisova, 1936 † - (GRYPHAEIDAE) (FOSSIL)
- arcuatilis, Adipicola arcuatilis R.K. Dell, 1995 - (MYTILIDAE)
- arcuatolobatum, Tornoceras arcuatolobatum Sobolew, 1914 † - syn of: Protornoceras planilobum Sobolew, 1914 † - (TORNOCERATIDAE) (FOSSIL)
- Arcuatomitrella, syn of: Genus Mitrella A. Risso, 1826 (COLUMBELLIDAE)
- arcuatostriatus, Drymaeus arcuatostriatus (L. Pfeiffer, 1855) - (BULIMULIDAE)
- Arcuatula, Genus Arcuatula F.P. Jousseaume in É. Lamy, 1919 (MYTILIDAE)
- arcuatula, Arcuatula arcuatula (S.C.T. Hanley, 1843) - (MYTILIDAE)
- arcuatulum, Fragum arcuatulum G.B. III Sowerby, 1874 - syn of: Fragum mundum (L.A. Reeve, 1845) - (CARDIIDAE)
- arcuatulus, Modiolus arcuatulus S.C.T. Hanley, 1843 - syn of: Arcuatula arcuatula (S.C.T. Hanley, 1843) - (MYTILIDAE)
- arcuatum, Proaustraliceras gigas arcuatum (T.L. Casey, 1961 †) - (ANCYLOCERATIDAE) (FOSSIL)
- arcuatum, Caecum arcuatum L. de Folin, 1867 - syn of: Caecum sepimentum L. de Folin, 1868 - (CAECIDAE)
- arcuatum, Dentalium arcuatum J.F. Gmelin, 1788 - syn of: Dentalium elephantinum C. Linnaeus, 1758 - (DENTALIIDAE)
- arcuatum, Discoceras arcuatum (Lossen, 1860 †) - (DISCOCERATIDAE) (FOSSIL)
- arcuatum, Graphoceras arcuatum (Buckman, 1901 †) - (GRAPHOCERATIDAE) (FOSSIL)
- arcuatum, Montyoceras arcuatum Flower, 1941 † - (HEBETOCERATIDAE) (FOSSIL)
- arcuatum, Ovula arcuatum L.A. Reeve, 1865 - syn of: Simnia arcuata (L.A. Reeve, 1865) - (OVULIDAE)
- arcuatum, Phragmoceras arcuatum Sowerby † - (PHRAGMOCERATIDAE) (FOSSIL)
- arcuatum, Irinoceras arcuatum Ruzhentsev, 1947 † - (PRIONOCERATIDAE) (FOSSIL)
- arcuatum, Pisidium arcuatum T. Prime, 1852 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- arcuatum, Tornoceras arcuatum House, 1965 † - (TORNOCERATIDAE) (FOSSIL)
- arcuatum, Schroederoceras arcuatum (Lossen †) - (TROCHOLITIDAE) (FOSSIL)
- arcuatus, Bostryx arcuatus A.S.H. Breure, 1978 - (BULIMULIDAE)
- arcuatus, Conus arcuatus W.J. Broderip & Sowerby, 1829 † - (CONIDAE) (FOSSIL)
- arcuatus, Conus arcuatus J.E. Gray, 1839 - syn of: Conasprella emarginata (L.A. Reeve, 1844) - (CONIDAE)
- arcuatus, Leptoconus arcuatus W.J. Swainson, 1840 - syn of: Vituliconus swainsoni (J.C. Estival & R. von Cosel, 1986) - (CONIDAE)
- arcuatus, Hidagaienites arcuatus Niko, 2000 † - (GOTLANDELLITIDAE) (FOSSIL)
- arcuatus, Deltoidonautilus arcuatus (G.P. Deshayes, 1842 †) - (HERCOGLOSSIDAE) (FOSSIL)
- arcuatus, Diplodon arcuatus W.B. Marshall, 1922 - syn of: Rhipidodonta funebralis (I. Lea, 1834) - (HYRIIDAE)
- arcuatus, Siphonochelus arcuatus (R.B. Hinds, 1843) - (MURICIDAE)
- arcuatus, Mycetopus arcuatus P.M. Heude, 1885 - syn of: Solenaia oleivorus (P.M. Heude, 1877) - (MYCETOPODIDAE)
- arcuatus, Mytilosootus arcuatus J.D. Stilwell & Zinsmeister, 1992 † - (MYTILIDAE) (FOSSIL)
- arcuatus, Brachidontes arcuatus S. Clessin, 1887 - syn of: Brachidontes granulatus (S.C.T. Hanley, 1843) - (MYTILIDAE)
- arcuatus, Nuculavus arcuatus B.S. Kues, 1991 † - (NUCULIDAE) (FOSSIL)
- arcuatus, Pecten arcuatus G.B. Brocchi, 1814 † - syn of: Camptonectes auritus (Schlotheim, 1813 †) - (PECTINIDAE) (FOSSIL)
- arcuatus, Cultellus magnus arcuatus J.G. Jeffreys, 1865 - (PHARIDAE)
- arcuatus, Solen arcuatus S. Tchang & H.M. Hwang, 1964 - syn of: Solen tchangi M. Huber, 2010 - (SOLENIDAE)
- arcuatus, Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- Arcuella, Genus Arcuella G. Nevill, 1874 ? (EULIMIDAE)
- arcula, Venignia arcula Berezovsky, 2015 † - (ARCIDAE) (FOSSIL)
- Arcula, syn of: Genus Arca C. Linnaeus, 1758 (ARCIDAE)
- arcula, Basterotia arcula J.C. Melvill, 1898 - (BASTEROTIIDAE)
- arcula, Rimmyjimina arcula Chronic, 1952 † - (KALENTERIDAE) (FOSSIL)
- arcula, Ostrea arcula J. Marwick, 1928 † - (OSTREIDAE) (FOSSIL)
- arcula, Alasmidonta arcula I. Lea, 1838 - (UNIONIDAE)
- arcularia, Buccinum arcularia C. Linnaeus, 1758 - syn of: Nassarius arcularia (C. Linnaeus, 1758) - (BUCCINIDAE)
- arcularia, Nassarius arcularia (C. Linnaeus, 1758) - (NASSARIIDAE)
- arcularia, Nassa arcularia C. Linnaeus, 1758 - syn of: Nassarius arcularia (C. Linnaeus, 1758) - (NASSARIIDAE)
- arcularia, Nassa arcularia J.B.P.A. Lamarck, 1816 - syn of: Nassarius arcularia (C. Linnaeus, 1758) - (NASSARIIDAE)
- Arcularia, syn of: Genus Nassarius Duméril, 1805 (NASSARIIDAE)
- Arcularia, syn of: Genus Nassarius Duméril, 1805 (NASSARIIDAE)
- arcularia, Distorsio arcularia P.F. Röding, 1798 - syn of: Nassarius arcularia (C. Linnaeus, 1758) - (PERSONIDAE)
- arcularia plicatus, Nassarius arcularia plicatus (P.F. Röding, 1798) - (NASSARIIDAE)
- arcularia spiracancellata, Nassa arcularia spiracancellata J.B.P.A. Lamarck, 1816 - syn of: Nassarius arcularia plicatus (P.F. Röding, 1798) - (NASSARIIDAE)
- ARCULARIDAE - syn of Family: NASSARIIDAE
- arculata, Bensbergia arculata (von Schlotheim, 1820 †) - (SOLENISCIDAE) (FOSSIL)
- arculata, Macrochilina arculata von Schlotheim, 1820 † - syn of: Bensbergia arculata (von Schlotheim, 1820 †) - (SOLENISCIDAE) (FOSSIL)
- arculata elongata, Bensbergia arculata elongata (G.A. Goldfuss, 1844 †) - (SOLENISCIDAE) (FOSSIL)
- Arculia, syn of: Genus Nassarius Duméril, 1805 (NASSARIIDAE)
- Arcullaea, Genus Arcullaea Vokes, 1949 † (GLYCYMERIDIDAE) (FOSSIL)
- arculus, Boehmoceras arculus (Morton, 1834 †) - (BACULITIDAE) (FOSSIL)
- Arculus, Genus Arculus T.A. de M. Monterosato, 1909 (LASAEIDAE)
- arcuoliratum, Spyroceras arcuoliratum (J.W. Hall, 1874 †) - (SPYROCERATIDAE) (FOSSIL)
- arcus, Eulitoma arcus P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- arcus, Permophorus arcus B.S. Kues, 2004 † - (KALENTERIDAE) (FOSSIL)
- arcus, Nassarius arcus (W.O. Cernohorsky, 1991) - (NASSARIIDAE)
- arcus, Zeuxis arcus W.O. Cernohorsky, 1991 - syn of: Nassarius arcus (W.O. Cernohorsky, 1991) - (NASSARIIDAE)
- arcustriatus, Tomelasmus arcustriatus (B.H. Wright in L. Pfeiffer, 1863) - (UROCOPTIDAE)
- arcyensis, Truncatellina arcyensis M. Klemm, 1943 - (VERTIGINIDAE)
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