- arsenei, Turritella arsenei Briart & Cornet, 1873 † - (TURRITELLIDAE) (FOSSIL)
- Arsenia, syn of: Genus Alvania A. Risso, 1826 (RISSOIDAE)
- arsenievi, Parajuga arsenievi L.A. Prozorova & Y.I. Starobogatov, 2004 - (SEMISULCOSPIRIDAE)
- arsenievi, Middendorffinaia arsenievi I.M. Moskvicheva & Y.I. Starobogatov, 1973 - syn of: Unio crassus L. Philipsson in A. Retzius, 1788 - (UNIONIDAE)
- Arsenievinaia, syn of: Genus Anodonta J.B.P.A. Lamarck, 1799 (UNIONIDAE)
- arsinoe, Pilsbryspira arsinoe (W.H. Dall, 1919) - (PSEUDOMELATOMIDAE)
- arsinoensis, Collonista arsinoensis (A. Issel, 1869) - (COLLONIIDAE)
- arsinoensis, Jitlada arsinoensis (A. Issel, 1869) - (TELLINIDAE)
- arsinoensis, Turbo arsinoensis A. Issel, 1869 - syn of: Collonista arsinoensis (A. Issel, 1869) - (TURBINIDAE)
- arsinovi, Melanopsis arsinovi Š. Brusina, 1902 † - (MELANOPSIDAE) (FOSSIL)
- arta, Argalista arta J. Marwick, 1928 † - (COLLONIIDAE) (FOSSIL)
- arta, Turbonilla arta A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- arta, Eurytellina arta (C.R. Laws, 1933 †) - (TELLINIDAE) (FOSSIL)
- artabra, Pruvotina artabra M. Zamarro, Ó. García-Álvarez & V. Urgorri, 2013 - (PRUVOTINIDAE)
- artabrensis, Pseudovermis artabrensis V. Urgorri, M.C. Cobo & Besteiro, 1991 - (PSEUDOVERMIDAE)
- Artachaea, Genus Artachaea L.S.R. Bergh, 1882 (DISCODORIDIDAE)
- artaensis, Albinaria contaminata artaensis (O. Böttger, 1878) - (CLAUSILIIDAE)
- artanensis, Pseudamnicola artanensis C.R. Altaba, 2007 - (HYDROBIIDAE)
- artata, Leptachatina artata C.M. Cooke, 1911 - (AMASTRIDAE)
- artata, Tylotoechus artata (W.H. Benson, 1856) - (PUPINIDAE)
- artatus, Cadulus artatus É.A.A. Locard, 1897 - (GADILIDAE)
- arteaga, Kurtzia arteaga (W.H. Dall & P. Bartsch, 1910) - (MANGELIIDAE)
- arteaga, Mangelia arteaga W.H. Dall & P. Bartsch, 1910 - syn of: Kurtzia arteaga (W.H. Dall & P. Bartsch, 1910) - (MANGELIIDAE)
- arteaga roperi, Kurtzia arteaga roperi (W.H. Dall, 1919) - (MANGELIIDAE)
- Artecallosa, syn of: Genus Pyrgodomus P. Fischer & J.C.H. Crosse, 1893 (HELICINIDAE)
- artema, Dolichupis artema (C.N. Cate, 1979) - (TRIVIIDAE)
- artemesia, Hormotoma artemesia Billings, 1865 † - (MURCHISONIIDAE) (FOSSIL)
- Artemidiconus, Genus Artemidiconus A.J. Da Motta, 1991 (CONORBIDAE)
- artemidis, Felaniella artemidis W.H. Dall, 1909 - (UNGULINIDAE)
- artemis, Chicoreus artemis G.E. Radwin & D'Attilio, 1976 - syn of: Triplex aculeatus (J.B.P.A. Lamarck, 1822) - (MURICIDAE)
- artemis, Circe artemis G.P. Deshayes, 1853 - syn of: Redicirce sulcata (J.E. Gray, 1838) - (VENERIDAE)
- Artemis, syn of: Genus Dosinia J.A. Scopoli, 1777 (VENERIDAE)
- artemisae, Volvarina artemisae J. Espinosa & J.A. Ortea, 2013 - (MARGINELLIDAE)
- artemisaense, Liguus fasciatus artemisaense C. de la Torre - (ORTHALICIDAE)
- artemisensis, Rhytidopoma clathratum artemisensis C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- artemisia, Plicolumna artemisia (W.G. Binney, 1861) - (BULIMULIDAE)
- artemisia, Eolytoceras artemisia Taylor, 1998 † - (LYTOCERATIDAE) (FOSSIL)
- artemisiae, Gongylostoma artemisiae (J. Gundlach in L. Pfeiffer, 1863) - (UROCOPTIDAE)
- Artemon, syn of: Genus Streptaxis J.E. Gray, 1837 (STREPTAXIDAE)
- Artemonopsis, Subgenus Tayloria (Artemonopsis) J. Germain, 1908 (STREPTAXIDAE)
- Artena, Genus Artena Conrad, 1870 (VENERIDAE) (FOSSIL)
- artensis, Mactra artensis R.P. Montrouzier, 1859 - (MACTRIDAE)
- artensis, Ostodes artensis (R.P. Montrouzier, 1859) - (NEOCYCLOTIDAE)
- artensis, Rissoina artensis R.P. Montrouzier, 1872 - (RISSOINIDAE)
- artensis, Trochus artensis P. Fischer, 1878 - (TROCHIDAE)
- artensis, Marmarostoma artensis R.P. Montrouzier, 1860 - (TURBINIDAE)
- arteoi, Doto arteoi J.A. Ortea, 1978 - (DOTIDAE)
- Arterioceras, Genus Arterioceras Zhuravleva, 1978 (ORTHOCERIDA (UNASSIGNED)) (FOSSIL)
- ARTESSIDAE - syn of Family: VOLVATELLIDAE
- arthaberi, Nicomedites arthaberi Tozer, 1994 † - (BEYRICHITIDAE) (FOSSIL)
- arthaberi, Eogymnites arthaberi (Diener, 1915 †) - (GYMNITIDAE) (FOSSIL)
- arthaberi, Gymnites arthaberi Mojsisovics, 1902 † - (GYMNITIDAE) (FOSSIL)
- arthaberi, Dieneria arthaberi A. Hyatt & Smith, 1905 † - (KLAMATHITIDAE) (FOSSIL)
- arthaberi, Provalenciennesia arthaberi (Gorjanovic-Kramberger, 1901 †) - (LYMNAEIDAE) (FOSSIL)
- arthaberi, Meekoceras arthaberi Smith, 1932 † - syn of: Meekoceras gracilitatis (White, 1879 †) - (MEEKOCERATIDAE) (FOSSIL)
- arthaberi, Tropites arthaberi Smith, 1927 † - (TROPITIDAE) (FOSSIL)
- arthaberi, Ussurites arthaberi Welter, 1915 † - (USSURITIDAE) (FOSSIL)
- Arthaberites, Genus Arthaberites Diener, 1900 (CERATITIDA (UNASSIGNED)) (FOSSIL)
- Arthemiderma, syn of: Genus Dosinia J.A. Scopoli, 1777 (VENERIDAE)
- Arthemis, syn of: Genus Dosinia J.A. Scopoli, 1777 (VENERIDAE)
- Arthessa, syn of: Genus Volvatella W.H. Pease, 1860 (VOLVATELLIDAE)
- Arthessidae, syn of: Subgenus Berthelinia (Anomalomya) A.E.M. Cossmann, 1887 (JULIIDAE) (FOSSIL)
- arthonensis, Pteria arthonensis (A.E.M. Cossmann, 1906 †) - (PTERIIDAE) (FOSSIL)
- arthricticus, Nodipecten arthricticus (L.A. Reeve, 1853) - syn of: Nodipecten arthriticus (L.A. Reeve, 1853) - (PECTINIDAE)
- arthritica, Barbitonia arthritica (A. Valenciennes, 1858) - (BUCCINIDAE)
- arthritica, Neptunea arthritica (A.C. Bernardi, 1857 †) - (BUCCINIDAE) (FOSSIL)
- arthritica, Barbitonia arthritica A. Adams & L.A. Reeve, 1850 - syn of: Barbitonia arthritica (A. Valenciennes, 1858) - (BUCCINIDAE)
- Arthritica, Genus Arthritica H.J. Finlay, 1926 (LASAEIDAE)
- arthritica, Calcarovula arthritica F.Jr. Lorenz & D. Fehse, 2009 - (OVULIDAE)
- arthritica, Sassia arthritica (Powell & J.A. Bartrum, 1929 †) - (RANELLIDAE) (FOSSIL)
- arthritica, Guillarmodia arthritica (F.G. Thompson, 1995) - (SPIRAXIDAE)
- arthritica, Callusaria arthritica (Barthum & Powell, 1928 †) - (STRUTHIOLARIIDAE) (FOSSIL)
- arthritica asamushi, Neptunea arthritica asamushi S. Nomura & K.M. Hatai, 1937 - syn of: Barbitonia arthritica (A. Valenciennes, 1858) - (BUCCINIDAE)
- arthritica asamusi, Neptunea arthritica asamusi S. Nomura & K.M. Hatai, 1937 - syn of: Barbitonia arthritica (A. Valenciennes, 1858) - (BUCCINIDAE)
- arthritica cumingi, Neptunea arthritica cumingi J.C.H. Crosse, 1862 - syn of: Neptunea cumingii J.C.H. Crosse, 1862 - (BUCCINIDAE)
- arthritica depressior, Barbitonia arthritica depressior (L. von Schrenck, 1867) - (BUCCINIDAE)
- arthritica matusima, Barbitonia arthritica matusima (S. Nomura & K.M. Hatai, 1937) - (BUCCINIDAE)
- arthritica miyata, Neptunea arthritica miyata S. Nomura & K.M. Hatai, 1937 - syn of: Barbitonia arthritica (A. Valenciennes, 1858) - (BUCCINIDAE)
- arthritica narita, Barbitonia arthritica narita (S. Nomura & K.M. Hatai, 1937) - (BUCCINIDAE)
- arthritica syobata, Barbitonia arthritica syobata (S. Nomura & K.M. Hatai, 1937) - (BUCCINIDAE)
- arthritica tyosi, Neptunea arthritica tyosi S. Nomura & K.M. Hatai, 1937 - syn of: Barbitonia arthritica (A. Valenciennes, 1858) - (BUCCINIDAE)
- arthriticus, Chrysodomus arthriticus A.C. Bernardi, 1857 † - syn of: Neptunea arthritica (A.C. Bernardi, 1857 †) - (BUCCINIDAE) (FOSSIL)
- arthriticus, Cyclophorus arthriticus W. Theobald, 1864 - (CYCLOPHORIDAE)
- arthriticus, Fusus arthriticus A. Valenciennes, 1858 - syn of: Barbitonia arthritica (A. Valenciennes, 1858) - (FASCIOLARIIDAE)
- arthriticus, Fusus arthriticus A.C. Bernardi, 1857 - syn of: Barbitonia arthritica (A. Valenciennes, 1858) - (FASCIOLARIIDAE)
- arthriticus, Nodipecten arthriticus (L.A. Reeve, 1853) - (PECTINIDAE)
- arthriticus, Harpago arthriticus (P.F. Röding, 1798) - (STROMBIDAE)
- Arthrophyllum, Genus Arthrophyllum Beyrich, 1850 (LAMELLORTHOCERATIDAE) (FOSSIL)
- Arthropteron, Subgenus Aspatharia (Arthropteron) Rochebrune, 1904 (IRIDINIDAE)
- arthurcooperi, Schematochiton arthurcooperi (Smith, 1976 †) - (LEPTOCHITONIDAE) (FOSSIL)
- arthuri, Architectonica arthuri Vasseur, 1881 † - (ARCHITECTONICIDAE) (FOSSIL)
- arthuri, Cylichna arthuri P. Dautzenberg, 1929 - (CYLICHNIDAE)
- arthuri, Waldo arthuri P.H. Valentich-Scott, D. Ó Foighil & J. Li, 2013 - (LASAEIDAE)
- arthuri, Mysella arthuri (J.E. Cooper & H.B. Preston, 1910) - (MONTACUTIDAE)
- arthuri, Ranularia arthuri (A.G. Beu, 1987) - (RANELLIDAE)
- arthuri, Triphora arthuri F.P. Jousseaume, 1884 - syn of: Nototriphora decorata (A. Adams, 1850) - (TRIPHORIDAE)
- arthuri, Liocallonia arthuri C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- arthuri, Vertigo arthuri E.C. Von Martens, 1882 - (VERTIGINIDAE)
- arthuri hubrichti, Vertigo arthuri hubrichti H.A. Pilsbry, 1934 - (VERTIGINIDAE)
- arthuri paradoxa, Vertigo arthuri paradoxa V. Sterki, 1900 - (VERTIGINIDAE)
- Arthuria, syn of: Genus Chaetopleura R.J. Shuttleworth, 1853 (CHAETOPLEURIDAE)
- Arthuria, syn of: Genus Pleurobranchus G.L.C.F.D. Cuvier, 1804 (PLEUROBRANCHIDAE)
- arthuriana, Sphaerospira arthuriana (J.C. Cox, 1873) - (CAMAENIDAE)
- arthuriana, Albinaria arthuriana (O. Böttger, 1878) - (CLAUSILIIDAE)
- arthuriana, Helix arthuriana J.C. Cox, 1873 - syn of: Sphaerospira arthuriana (J.C. Cox, 1873) - (HELICIDAE)
- arthuriana, Fadyenia arthuriana (E. Chitty, 1857) - (HELICINIDAE)
- arthuriana xenogena, Albinaria arthuriana xenogena H. Nordsieck, 2017 - (CLAUSILIIDAE)
- arthurpennelli, Lunarca arthurpennelli C.J. Maury, 1917 † - (ARCIDAE) (FOSSIL)
- artia, Polystira artia S.S. Berry, 1957 - syn of: Polystira oxytropis (G.B. I Sowerby, 1834) - (TURRIDAE)
- artiaperta, Volvula artiaperta G. Yamakawa, 1911 - syn of: Volvulella eburnea (A. Adams, 1850) - (ACTEOCINIDAE)
- artiasensis, Bythinella artiasensis P. Fagot, 1887 - syn of: Bythinella rufescens (H.C. Küster, 1852) - (BYTHINELLIDAE)
- artica, Hiatella artica C. Linnaeus, 1767 - syn of: Hiatella arctica (C. Linnaeus, 1767) - (HIATELLIDAE)
- artica, Eumetula artica O.A.L. Mörch, 1875 - syn of: Eumetula arctica (O.A.L. Mörch, 1857) - (NEWTONIELLIDAE)
- artica, Trivia artica R. Pulteney, 1799 - syn of: Trivia arctica (R. Pulteney, 1799) - (TRIVIIDAE)
- articense, Bythiospeum articense R. Bernasconi, 1985 - (HYDROBIIDAE)
- Articheilus, Genus Articheilus Ruzhentsev & Shimanskiy, 1954 (MOSQUOCERATIDAE) (FOSSIL)
- articularis, Scalptia articularis (G.B. I Sowerby, 1832) - (CANCELLARIIDAE)
- articularis, Harpa articularis J.B.P.A. Lamarck, 1822 - (HARPIDAE)
- articularis, Cantharidus articularis A. Adams, 1853 - syn of: Strigosella lepida (R.A. Philippi, 1846) - (TROCHIDAE)
- articularoides, Scalptia articularoides A. Verhecken, 1995 - (CANCELLARIIDAE)
- articulata, Barbatia articulata G.P. Deshayes, 1858 † - (ARCIDAE) (FOSSIL)
- articulata, Rhinoclavis articulata (A. Adams & L.A. Reeve, 1850) - (CERITHIIDAE)
- articulata, Rhinoclavis articulata N.H. Odhner, 1917 - syn of: Rhinoclavis articulata (A. Adams & L.A. Reeve, 1850) - (CERITHIIDAE)
- articulata, Canalicia articulata (C.L.F. von Sandberger, 1863 †) - (CLAUSILIIDAE) (FOSSIL)
- articulata, Mitrella articulata S.M. Souverbie, 1864 - syn of: Mitrella nympha (L.C. Kiener, 1841) - (COLUMBELLIDAE)
- articulata, Columbella articulata S.M. Souverbie, 1864 - syn of: Mitrella nympha (L.C. Kiener, 1841) - (COLUMBELLIDAE)
- articulata, Conasprella articulata (G.B. III Sowerby, 1873) - (CONIDAE)
- articulata, Textilia articulata P. Dautzenberg, 1937 - syn of: Textilia bullata (C. Linnaeus, 1758) - (CONIDAE)
- articulata, Pictobalcis articulata (G.B. I Sowerby, 1834) - (EULIMIDAE)
- articulata, Aphanoconia articulata (L. Pfeiffer, 1853) - (HELICINIDAE)
- articulata, Littoraria articulata (R.A. Philippi, 1846) - (LITTORINIDAE)
- articulata, Eucithara articulata (G.B. III Sowerby, 1894) - (MANGELIIDAE)
- articulata, Cythara articulata G.B. III Sowerby, 1894 - syn of: Eucithara articulata (G.B. III Sowerby, 1894) - (MANGELIIDAE)
- articulata, Mitra articulata L.A. Reeve, 1845 - syn of: Pusia histrio (L.A. Reeve, 1844) - (MITRIDAE)
- articulata, Mitra articulata R.A. Philippi, 1874 - syn of: Vexillum deshayesii (L.A. Reeve, 1844) - (MITRIDAE)
- articulata, Hormotoma articulata (Murchison, 1839 †) - (MURCHISONIIDAE) (FOSSIL)
- articulata, Cellana articulata L.A. Reeve, 1855 - syn of: Cellana cylindrica (J.F. Gmelin, 1791) - (NACELLIDAE)
- articulata, Natica articulata R.A. Philippi, 1852 - syn of: Naticarius alapapilionis (P.F. Röding, 1798) - (NATICIDAE)
- articulata, Nerita articulata A.A. Gould, 1847 - syn of: Nerita balteata L.A. Reeve, 1855 - (NERITIDAE)
- articulata, Patella articulata L.A. Reeve, 1855 - syn of: Cellana cylindrica (J.F. Gmelin, 1791) - (PATELLIDAE)
- articulata, Tropidophora articulata (J.E. Gray, 1838) - (POMATIIDAE)
- articulata, Pinctada articulata A.A. Gould, 1861 - syn of: Pseudominolia articulata (A.A. Gould, 1861) - (PTERIIDAE)
- articulata, Besla articulata C. Hedley, 1909 - (PYRAMIDELLIDAE)
- articulata, Daphnella vitrea articulata R.P.J. Hervier, 1897 - (RAPHITOMIDAE)
- articulata, Minolia articulata A.A. Gould, 1861 - syn of: Pseudominolia articulata (A.A. Gould, 1861) - (SOLARIELLIDAE)
- articulata, Pseudominolia articulata (A.A. Gould, 1861) - (TROCHIDAE)
- articulata, Gibbula articulata A.A. Gould, 1861 - syn of: Pseudominolia articulata (A.A. Gould, 1861) - (TROCHIDAE)
- articulata, Stomatella articulata A. Adams, 1850 - syn of: Granata sulcifera (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulata flavidula, Columbella articulata flavidula R.P.J. Hervier, 1899 - syn of: Mitrella nympha (L.C. Kiener, 1841) - (COLUMBELLIDAE)
- articulata pallidior, Columbella articulata pallidior R.P.J. Hervier, 1899 - syn of: Mitrella nympha (L.C. Kiener, 1841) - (COLUMBELLIDAE)
- articulata retiaria, Columbella articulata retiaria R.P.J. Hervier, 1899 - syn of: Mitrella nympha (L.C. Kiener, 1841) - (COLUMBELLIDAE)
- articulata subnympha, Columbella articulata subnympha R.P.J. Hervier, 1899 - syn of: Mitrella nympha (L.C. Kiener, 1841) - (COLUMBELLIDAE)
- articulata undata, Phorcus articulata undata T.A. de M. Monterosato, 1888 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulatum, Pusia articulatum (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- articulatum, Harpax articulatum McRoberts, 2017 † - (PLICATULIDAE) (FOSSIL)
- articulatum, Pomatias articulatum G.B. Sowerby, 1843 - syn of: Adamsiella variabilis (C.B. Adams, 1849) - (POMATIIDAE)
- articulatus, Acteon articulatus J. Marwick, 1931 † - (ACTEONIDAE) (FOSSIL)
- articulatus, Amphidromus adamsii articulatus H.C. Fulton, 1896 - (CAMAENIDAE)
- articulatus, Chiton articulatus G.B. I Sowerby in W.J. Broderip & G.B. I Sowerby, 1832 - (CHITONIDAE)
- articulatus, Cochlicella articulatus J.B.P.A. Lamarck - syn of: Cochlicella acuta (O.F. Müller, 1774) - (COCHLICELLIDAE)
- articulatus, Euomphalus articulatus G.A. Goldfuss, 1844 † - (EUOMPHALIDAE) (FOSSIL)
- articulatus, Fusinus articulatus (G.B. II Sowerby, 1880) - (FASCIOLARIIDAE)
- articulatus, Fusus articulatus J.B.P.A. Lamarck, 1822 - syn of: Pisania pusio (C. Linnaeus, 1758) - (FASCIOLARIIDAE)
- articulatus, Fusus articulatus G.B. II Sowerby, 1880 - syn of: Fusinus articulatus (G.B. II Sowerby, 1880) - (FASCIOLARIIDAE)
- articulatus, Siratus articulatus (L.A. Reeve, 1845) - (MURICIDAE)
- articulatus, Metaphos articulatus (R.B. Hinds, 1844) - (NASSARIIDAE)
- articulatus, Naticarius articulatus (R.A. Philippi, 1852) - (NATICIDAE)
- articulatus, Chlamys articulatus Sowerby, 1840 † - (PECTINIDAE) (FOSSIL)
- articulatus, Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulatus, Trochus articulatus J.B.P.A. Lamarck, 1822 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulatus, Turbo articulatus L.A. Reeve, 1848 - (TURBINIDAE)
- articulatus constricta, Phorcus articulatus constricta T.A. de M. Monterosato, 1888 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulatus denudatus, Phorcus articulatus denudatus T.A. de M. Monterosato, 1883 - (TROCHIDAE)
- articulatus depauperata, Phorcus articulatus depauperata T.A. de M. Monterosato, 1888 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulatus flammoides, Phorcus articulatus flammoides F. Nordsieck, 1982 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulatus fulminea, Phorcus articulatus fulminea T.A. de M. Monterosato, 1888 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulatus lineolata, Trochus articulatus lineolata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1884 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulatus major, Trochus articulatus major M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1884 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulatus minor, Phorcus articulatus minor T.A. de M. Monterosato, 1888 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- articulatus trivialis, Phorcus articulatus trivialis T.A. de M. Monterosato, 1888 - syn of: Phorcus articulatus (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- Articulipoma, Genus Articulipoma Bartsch, 1946 (POMATIIDAE)
- Articulopoma, Subgenus Chondropoma (Articulopoma) P. Bartsch, 1946 (POMATIIDAE)
- articulosus, Nodipecten articulosus Cooke, 1919 † - (PECTINIDAE) (FOSSIL)
- artiense, Metacoceras artiense N.D. Kruglov, 1928 † - (TAINOCERATIDAE) (FOSSIL)
- artiensis, Aviculopecten artiensis Krotow, 1885 † - (AVICULOPECTINIDAE) (FOSSIL)
- artiensis, Palaeoneilo artiensis Stuckenberg, 1898 † - (MALLETIIDAE) (FOSSIL)
- artiensis, Artinskia artiensis (Grünewaldt, 1860 †) - (MEDLICOTTIIDAE) (FOSSIL)
- artifex, Conocardium artifex Barrande, 1881 † - syn of: Cartericardia artifex (Barrande, 1881 †) - (CONOCARDIIDAE) (FOSSIL)
- artifex, Cartericardia artifex (Barrande, 1881 †) - (HIPPOCARDIIDAE) (FOSSIL)
- artifex, Pisidium artifex J.G.J. Kuiper, 1960 - (SPHAERIIDAE)
- artificiosus, Ancylus artificiosus P.M. Pallary, 1920 - syn of: Ancylus fluviatilis O.F. Müller, 1774 - (PLANORBIDAE)
- artifina, Formosana artifina (P.M. Heude, 1885) - (CLAUSILIIDAE)
- Artigesia, Genus Artigesia Freneix & Sornay, 1974 (MONOPLEURIDAE) (FOSSIL)
- artilectus, Surenites artilectus Ruzhencev & Bogoslovskaya, 1978 † - (RETICULOCERATIDAE) (FOSSIL)
- artilesi, Volvarina artilesi J. Espinosa, J.A. Ortea & L. Moro, 2014 - (MARGINELLIDAE)
- artilesi, Clelandella artilesi C. Vilvens, F. Swinnen & F. Déniz, 2011 - (TROCHIDAE)
- Artimetalegoceras, Subgenus Metalegoceras (Artimetalegoceras) Miller, 1936 (METALEGOCERATIDAE) (FOSSIL)
- artimi, Epitonium artimi (F.P. Jousseaume, 1912) - (EPITONIIDAE)
- Artimis, syn of: Genus Dosinia J.A. Scopoli, 1777 (VENERIDAE)
- artini, Corbicula artini P.M. Pallary, 1903 - syn of: Corbicula fluminalis (O.F. Müller, 1774) - (CYRENIDAE)
- artini albina, Corbicula artini albina P.M. Pallary, 1903 - syn of: Corbicula fluminalis (O.F. Müller, 1774) - (CYRENIDAE)
- Artinksia, syn of: Genus Artinskia Karpinsky , 1926 (MEDLICOTTIIDAE) (FOSSIL)
- Artinskia, Genus Artinskia Karpinsky , 1926 (MEDLICOTTIIDAE) (FOSSIL)
- Artioceras, Genus Artioceras Ruzhencev , 1947 (MEDLICOTTIIDAE) (FOSSIL)
- Artioceratoides, Genus Artioceratoides Leonova , 1985 (MEDLICOTTIIDAE) (FOSSIL)
- artipica, Yoldiella artipica J.A. Allen, A. Sanders & G. Hannah, 1995 - (YOLDIIDAE)
- artiumbilici, Parthenina artiumbilici Peñas & Rolán, 2017 - (PYRAMIDELLIDAE)
- artizona, Cantharidus artizona (A. Adams, 1853) - (TROCHIDAE)
- artizona, Micrelenchus artizona A. Adams, 1853 - syn of: Cantharidus artizona (A. Adams, 1853) - (TROCHIDAE)
- artolobatum, Paragastrioceras artolobatum Ruzhentsev, 1956 † - (PARAGASTRIOCERATIDAE) (FOSSIL)
- Artopoia, syn of: Genus Terebellum P.F. Rφding, 1798 (SERAPHSIDAE)
- artopta, Mactra artopta Woods, 1850 † - (MACTRIDAE) (FOSSIL)
- artoptus, Pseudohermes artoptus (G.B. II Sowerby, 1833) - (CONIDAE)
- artufelli, Cypraea artufelli F.P. Jousseaume, 1876 - syn of: Palmadusta artuffeli (F.P. Jousseaume, 1876) - (CYPRAEIDAE)
- artuffeli, Palmadusta artuffeli (F.P. Jousseaume, 1876) - (CYPRAEIDAE)
- artuffeli, Cypraea artuffeli F.P. Jousseaume, 1876 - syn of: Palmadusta artuffeli (F.P. Jousseaume, 1876) - (CYPRAEIDAE)
- artuffeli, Otopoma artuffeli F.P. Jousseaume, 1882 - (POMATIIDAE)
- artum, Cheiloceras artum Bogoslovsky, 1971 † - (CHEILOCERATIDAE) (FOSSIL)
- artum, Manticoceras artum Bogoslovsky, 1958 † - (GEPHUROCERATIDAE) (FOSSIL)
- artum, Bashkortoceras artum Ruzhentsev & Bogoslovskaya, 1971 † - (HOMOCERATIDAE) (FOSSIL)
- artumbilicatum, Sulcogirtyoceras artumbilicatum Ruzhentsev & Bogoslovskaya, 1971 † - (GIRTYOCERATIDAE) (FOSSIL)
- artumbilicatum, Miklukhoceras artumbilicatum Leonova, 1992 † - (MEDLICOTTIIDAE) (FOSSIL)
- arturi, Amandana arturi (F. Haas, 1924) - (HYGROMIIDAE)
- arturi, Cyphoma arturi D. Fehse, 2007 - (OVULIDAE)
- arturi, Anodonta arturi J.R. Bourguignat, 1883 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- arturoi, Neophylloceras arturoi Ifrim & al., 2013 † - (NEOPHYLLOCERATIDAE) (FOSSIL)
- arturrolli, Sinotaia arturrolli R.A.M. Brandt, 1968 - (VIVIPARIDAE)
- artus, Capitoconus artus Skovsted, 2004 † - (HELCIONELLIDAE) (FOSSIL)
- artus, Somoholites artus Ruzhentsev, 1951 † - (SOMOHOLITIDAE) (FOSSIL)
- artus, Sibyllonautilus artus E.S. Sobolev, 1989 † - (TAINOCERATIDAE) (FOSSIL)
- Artusius, syn of: Genus Pharus W.E. Leach in T. Brown, 1844 (PHARIDAE)
- artutus, Chryseofusus artutus R. Hadorn & K. Fraussen, 2003 - (FASCIOLARIIDAE)
- artyomensis, Euflemingites artyomensis Smyshlyaeva, 2010 † - (FLEMINGITIDAE) (FOSSIL)
- artyomensis, Ussurijuvenites artyomensis Smyshlyaeva & Zakharov, 2012 † - (MELAGATHICERATIDAE) (FOSSIL)
- aruana, Helicina aruana L. Pfeiffer - (HELICINIDAE)
- aruana sculpta, Helicina aruana sculpta (E.C. Von Martens, 1864) - (HELICINIDAE)
- aruanus, Syrinx aruanus (C. Linnaeus, 1758) - (TURBINELLIDAE)
- Arubaconus, Genus Arubaconus E.J. Petuch, 2013 (CONIDAE)
- arubagrandis, Gibberula arubagrandis T. McCleery, 2008 - (CYSTISCIDAE)
- arubana, Cistulops arubana H.B. Baker, 1924 - (POMATIIDAE)
- arubana, Tudora fossor arubana H.B. Baker, 1924 - (POMATIIDAE)
- arubanum, Cerion arubanum H.B. Baker, 1924 - (CERIONIDAE)
- arubensis, Cerodrillia arubensis P.J. Fallon, 2016 - (DRILLIIDAE)
- arubensis, Alvania arubensis D. De Jong & H.E. Coomans, 1988 - (RISSOIDAE)
- aruginosa, Turbo aruginosa P.F. Röding, 1798 - syn of: Turbo petholatus C. Linnaeus, 1758 - (TURBINIDAE)
- arula, Tylotoechus arula (W.H. Benson, 1856) - (PUPINIDAE)
- arundelensis, Bythinia arundelensis Lull, 1911 † - (AMNICOLIDAE) (FOSSIL)
- arundinea, Ambonychia arundinea Tunnicliff, 1982 † - (AMBONYCHIIDAE) (FOSSIL)
- arundinea, Terebra herklotsi arundinea E.W. Vredenburg, 1921 - (TEREBRIDAE)
- arundinetorum, Bradybaena similaris arundinetorum (P.M. Heude, 1890) - (BRADYBAENIDAE)
- arundinetorum, Succinea arundinetorum P.M. Heude, 1882 - (SUCCINEIDAE)
- arundineus, Pseudohastites arundineus H.G. Lang, 1928 † - (PASSALOTEUTHIDIDAE) (FOSSIL)
- arundo, Syrnola arundo A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- aruntalis, Lymnaea aruntalis B.C. Cotton & F.C. Godfrey, 1938 - syn of: Austropeplea tomentosa (L. Pfeiffer, 1855) - (LYMNAEIDAE)
- arupinensis, Uncidens arupinensis G.S. Coen, 1934 - syn of: Gastrana fragilis (C. Linnaeus, 1758) - (TELLINIDAE)
- arusensis, Turmalites arusensis Farsan & Blind, 1990 † - (TURMALITIDAE) (FOSSIL)
- arussiorum, Perisphinctes arussiorum Dacque, 1905 † - (PERISPHINCTIDAE) (FOSSIL)
- arvanus, Inoceramus arvanus L.W. Stephenson, 1953 † - (INOCERAMIDAE) (FOSSIL)
- Arvella, Genus Arvella P. Bartsch in O.A. Scarlato, 1960 (MYTILIDAE)
- arveloi, Flabellina arveloi J.A. Ortea & J. Espinosa, 1998 - (FLABELLINIDAE)
- arvensis, Monacha arvensis N. Pini, 1879 - syn of: Monacha cartusiana (O.F. Müller, 1774) - (HYGROMIIDAE)
- arvernensis, Pseudamnicola arvernensis (Bouillet, 1835 †) - (HYDROBIIDAE) (FOSSIL)
- arvernorum, Helicella arvernorum É.A.A. Locard, 1894 - syn of: Helicella itala (C. Linnaeus, 1758) - (HYGROMIIDAE)
- arvetensis, Laeogyra arvetensis Wängberg-Eriksson, 1979 † - (ONYCHOCHILIDAE) (FOSSIL)
- arvina, Dentimargo arvina (C.F. Laseron, 1957) - (MARGINELLIDAE)
- arx, Calliostoma arx C. Vilvens, 2005 - (CALLIOSTOMATIDAE)
- Arxellia, Genus Arxellia C. Vilvens, S.T. Williams & D.G. Herbert, 2014 (SOLARIELLIDAE)
- arythronota, Stenoplax arythronota (C.B. Adams, 1845) - (ISCHNOCHITONIDAE)
- Arzelella, Subgenus Daonella (Arzelella) Turculet, 1972 (DAONELLIDAE) (FOSSIL)
- arzellus, Pecten arzellus A. De Gregorio, 1885 - syn of: Mimachlamys varia (C. Linnaeus, 1758) - (PECTINIDAE)
- Asa, syn of: Genus Dosinia J.A. Scopoli, 1777 (VENERIDAE)
- asachiensis, Adula asachiensis S. Kanno, 1968 † - (MYTILIDAE) (FOSSIL)
- asaedai, Imaclava asaedai (L.G. Hertlein & A.M. Strong, 1951) - (DRILLIIDAE)
- asagaensis, Aulacofusus asagaensis J. Makiyama, 1934 † - (BUCCINIDAE) (FOSSIL)
- asagaiense, Clinocardium asagaiense (J. Makiyama, 1934 †) - (CARDIIDAE) (FOSSIL)
- asagaiense makiyamae, Ciliatocardium asagaiense makiyamae Kamada, 1962 † - syn of: Ciliatocardium makiyamae (Kamada, 1962 †) - (CARDIIDAE) (FOSSIL)
- asagaiensis, Ampullina asagaiensis J. Makiyama, 1957 † - syn of: Cryptonatica janthostoma (G.P. Deshayes, 1839) - (AMPULLINIDAE) (FOSSIL)
- asagaiensis, Neverita asagaiensis J. Makiyama, 1934 † - (NATICIDAE) (FOSSIL)
- asagaiensis, Macoma asagaiensis J. Makiyama, 1934 † - (TELLINIDAE) (FOSSIL)
- asagiensis, Capreoliceras asagiensis Alkaya & Meister, 1995 † - (PHRICODOCERATIDAE) (FOSSIL)
- asahiensis, Adula asahiensis Kanno † - (MYTILIDAE) (FOSSIL)
- asakuraensis, Pinna asakuraensis T. Nagao, 1928 - (PINNIDAE)
- asaluensis, Oospira asaluensis (W.T. Blanford, 1872) - (CLAUSILIIDAE)
- asaluensis, Alycaeus asaluensis H.H. Godwin-Austen, 1914 - (CYCLOPHORIDAE)
- asamai, Collignonites asamai Bando, 1977 † - (PROPTYCHITIDAE) (FOSSIL)
- asamiae, Gryphochiton asamiae Hoare & Karasawa, 2008 † - (GRYPHOCHITONIDAE) (FOSSIL)
- asamiana, Sinicola asamiana B. Páll-Gergely, 2013 - (PLECTOPYLIDAE)
- Asamiella, Genus Asamiella Nόtzel & Nakazawa, 2012 (NERITARIIDAE) (FOSSIL)
- Asamiorbis, Subgenus Neohelix (Asamiorbis) Emberton, 1995 (POLYGYRIDAE)
- asamurai, Macrochlamys asamurai S. Panha, 1996 - (ARIOPHANTIDAE)
- asamusi, Siogamaia asamusi S. Nomura, 1936 - (PYRAMIDELLIDAE)
- asamusiensis, Cerberilla asamusiensis K. Baba, 1940 - (AEOLIDIIDAE)
- asamusiensis, Clavatula asamusiensis S. Nomura & N. Zinbo, 1940 - (CLAVATULIDAE)
- asamusiensis, Paradrillia asamusiensis S. Nomura & N. Zinbo, 1940 - syn of: Paradrillia inconstans (E.A. Smith, 1875) - (HORAICLAVIDAE)
- asanoi, Euomphalus asanoi T. Kase, 1988 † - (EUOMPHALIDAE) (FOSSIL)
- asanoi, Chicoreus asanoi O. Masuda, 1956 † - (MURICIDAE) (FOSSIL)
- asapha, Asoella asapha (H.A. Leanza, 1942 †) - (HETEROPECTINIDAE) (FOSSIL)
- asaphes, Subzebinus asaphes (R. Sturany, 1900) - (ENIDAE)
- asaphes brevior, Subzebinus asaphes brevior (R. Sturany, 1900) - (ENIDAE)
- asapheus, Lucinoma asapheus P.G. Oliver, C.L. Rodrigues & C.M. Cunha, 2011 - (LUCINIDAE)
- Asaphiceras, Genus Asaphiceras Foerste, 1928 (ONCOCERATIDAE) (FOSSIL)
- Asaphinella, Genus Asaphinella Cossmann, 1886 (PSAMMOBIIDAE) (FOSSIL)
- Asaphinoides, Genus Asaphinoides F. Hodson, 1931 (VENERIDAE)
- Asaphis, Genus Asaphis Modeer, 1793 (PSAMMOBIIDAE)
- Asaphoceras, Genus Asaphoceras Spath, 1924 (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- Asapholytoceras, Genus Asapholytoceras Spath, 1927 (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- asarca, Bactrocythara asarca (W.H. Dall & C.T. Simpson, 1901) - (MANGELIIDAE)
- asarotum, Mioawateria asarotum A.V. Sysoev, 1997 - (RAPHITOMIDAE)
- asbecki, Elysia asbecki H. Wägele, K. Stemmer, G.E. Burghardt & K. Händeler, 2010 - (PLAKOBRANCHIDAE)
- Asbestoceras, Genus Asbestoceras Zhuravleva, 1972 (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- asbestoides, Acanthochitona asbestoides Unknown - syn of: Acanthochitona sueurii (H.M.D. de Blainville, 1825) - (ACANTHOCHITONIDAE)
- Asbjoernsenia, syn of: Genus Tellina C. Linnaeus, 1758 (TELLINIDAE)
- Ascalista, Genus Ascalista J. Drivas & M. Jay, 1990 (COLUMBELLIDAE)
- ascania, Monacha ascania B. Hausdorf, 2000 - (HYGROMIIDAE)
- ascania, Fagotia ascania J.R. Bourguignat, 1884 - syn of: Esperiana esperi (A.E.J. Férussac, 1823) - (MELANOPSIDAE)
- ascanias, Buccinum ascanias J.G. Bruguière, 1789 - syn of: Tritia incrassata (H. Strøm, 1768) - (BUCCINIDAE)
- ascanica, Fagotia ascanica J.R. Bourguignat, 1884 - (MELANOPSIDAE)
- ascaniensis, Pupilla ascaniensis A. Schmidt, 1849 - syn of: Truncatellina costulata (S. Nilsson, 1823) - (PUPILLIDAE)
- ascanii, Dendronotus ascanii G.O. Sars, 1837 - syn of: Dendronotus frondosus (P. Ascanius, 1774) - (DENDRONOTIDAE)
- ascanius, Unio pictorum ascanius W. Kobelt, 1913 - (UNIONIDAE)
- ascara, Bactrocythara ascara (W.H. Dall & C.T. Simpson, 1900 †) - (MANGELIIDAE) (FOSSIL)
- ascaris, Aclis ascaris (Turton, 1819) - (ACLIDIDAE)
- ascaris, Alvania ascaris Turton, 1819 - syn of: Aclis ascaris (Turton, 1819) - (RISSOIDAE)
- ascaris, Turbo ascaris W. Turton, 1819 - syn of: Aclis ascaris (Turton, 1819) - (TURBINIDAE)
- Ascarosepion, syn of: Genus Sepia C. Linnaeus, 1758 (SEPIIDAE)
- Ascaulocardium, Genus Ascaulocardium Pojeta & N. F., 1987 (CLAVAGELLIDAE) (FOSSIL)
- ascencionis, Nerita ascencionis J.F. Gmelin, 1791 - syn of: Nerita ascensionis J.F. Gmelin, 1791 - (NERITIDAE)
- ascencus, Stiracolpus ascencus J. Marwick, 1957 - syn of: Stiracolpus pagoda (L.A. Reeve, 1849) - (TURRITELLIDAE)
- ascendens, Lissoacme derelictus ascendens H.A. Pilsbry, 1944 - (BULIMULIDAE)
- ascendens, Chondrina ascendens C.A. Westerlund, 1878 - (CHONDRINIDAE)
- ascendens, Trypanostylus ascendens Böhm, 1895 † - (COELOSTYLINIDAE) (FOSSIL)
- ascendens, Philonesia ascendens H.B. Baker, 1940 - (EUCONULIDAE)
- ascendens, Thaumastus ascendens (L. Pfeiffer, 1853) - (MEGASPIRIDAE)
- ascendens, Imbricatoceras ascendens (C.H. Blake, 1882 †) - (MICHELINOCERATIDAE) (FOSSIL)
- ascendens, Polyptychites ascendens A. von Koenen, 1902 † - (POLYPTYCHITIDAE) (FOSSIL)
- ascendens, Posttornoceras ascendens Hartenfels & Becker, 2016 † - (POSTTORNOCERATIDAE) (FOSSIL)
- ascendens, Rhaphaulus ascendens E.R. Sykes, 1903 - syn of: Raphaulus lorraini L. Pfeiffer, 1856 - (PUPINIDAE)
- ascensa, Austrochloritis ascensa T. Iredale, 1943 - (CAMAENIDAE)
- ascensionensis, Purpura ascensionensis J.R.C. Quoy & J.P. Gaimard, 1833 - syn of: Thais nodosa ascensionis J.R.C. Quoy & J.P. Gaimard, 1833 - (MURICIDAE)
- ascensionis, Purpura ascensionis J.R.C. Quoy & J.P. Gaimard, 1833 - syn of: Thais nodosa ascensionis J.R.C. Quoy & J.P. Gaimard, 1833 - (MURICIDAE)
- ascensionis, Thais nodosa ascensionis J.R.C. Quoy & J.P. Gaimard, 1833 - (MURICIDAE)
- ascensionis, Nerita ascensionis J.F. Gmelin, 1791 - (NERITIDAE)
- ascensionis, Peronaea ascensionis G.B. III Sowerby, 1905 † - syn of: Megangulus luteus (W. Wood, 1828 †) - (TELLINIDAE) (FOSSIL)
- ascensionis chlorostoma, Nerita ascensionis chlorostoma J.B.P.A. Lamarck, 1810 - (NERITIDAE)
- ascensionis deturpensis, Nerita ascensionis deturpensis G.J. Vermeij, 1970 - (NERITIDAE)
- ascensionis trinidadensis, Nerita ascensionis trinidadensis G.J. Vermeij, 1970 - (NERITIDAE)
- Ascensovoluta, Genus Ascensovoluta Pchelintsev, 1953 (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- ascensum, Anabathron ascensum C. Hedley, 1907 - (ANABATHRIDAE)
- ascensum, Tenuicerithium ascensum R.C. Hoerle, 1972 † - (CERITHIIDAE) (FOSSIL)
- ascensus, Calotrophon ascensus E.H. Vokes, 1976 † - (MURICIDAE) (FOSSIL)
- ascensus, Orthonema ascensus Anderson & al., 1985 † - (ORTHONEMATIDAE) (FOSSIL)
- ascensus, Zeacolpus ascensus J. Marwick, 1957 - syn of: Stiracolpus pagoda (L.A. Reeve, 1849) - (TURRITELLIDAE)
- asceta, Fluxinella asceta B.A. Marshall, 1991 - (SEGUENZIIDAE)
- Ascetoaxinus, Genus Ascetoaxinus Oliver & Frey, 2014 (THYASIRIDAE)
- Ascetostoma, Genus Ascetostoma D.G. Herbert, 2012 (CHILODONTIDAE)
- Aschera, syn of: Genus Zebrina F. Held, 1837 (ENIDAE)
- ascherae, Murella globularis ascherae (W. Kobelt, 1880) - (HELICIDAE)
- Ascheria, Genus Ascheria Kaim & al., 2014 (PROVANNIDAE) (FOSSIL)
- aschiltaensis, Acanthohoplites aschiltaensis (Anthula, 1899 †) - (DESHAYESITIDAE) (FOSSIL)
- ascia, Venericor ascia (B. Rogers, 1839 †) - (CARDITIDAE) (FOSSIL)
- ascia, Goniophora ascia Kríž, 2008 † - (MODIOMORPHIDAE) (FOSSIL)
- ascia, Contradens ascia S.C.T. Hanley, 1856 - syn of: Contradens contradens ascia (S.C.T. Hanley, 1856) - (UNIONIDAE)
- ascia, Contradens contradens ascia (S.C.T. Hanley, 1856) - (UNIONIDAE)
- ascidicola, Okenia ascidicola M.P. Morse, 1972 - syn of: Okenia aspersa (J. Alder & A. Hancock, 1845) - (GONIODORIDIDAE)
- ascidiiformis, Fasciculiconcha ascidiiformis Guskov, 1984 † - (PECTINIDA (UNASSIGNED)) (FOSSIL)
- ascifera, Dolabrifera ascifera P.C.A.S.L. Rang, 1828 - syn of: Dolabrifera dolabrifera (P.C.A.S.L. Rang, 1828) - (APLYSIIDAE)
- ascita, Westraltrachia ascita G.A. Solem, 1984 - (CAMAENIDAE)
- Ascitellina, syn of: Subgenus Tellina (Elliptotellina) A.E.M. Cossmann, 1886 (TELLINIDAE)
- ascitica, Taringa ascitica J.A. Ortea, A.M. Pérez & E.M. Llera, 1982 - (DISCODORIDIDAE)
- Ascobulla, Genus Ascobulla E.A. du B. Marcus, 1972 (VOLVATELLIDAE)
- Ascoceras, Genus Ascoceras Barrande, 1847 (ASCOCERATIDAE) (FOSSIL)
- ASCOCERATIDAE Barrande, 1867 - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-ASCOCERIDA [Order]) (FOSSIL)
- ASCOCERIDA (UNASSIGNED) - Family (CEPHALOPODA-NAUTILOIDEA [Subclass]-ASCOCERIDA [Order]) (FOSSIL)
- ascoceroides, Paraphragmites ascoceroides Flower, 1943 † - (PARAPHRAGMITIDAE) (FOSSIL)
- Ascocranchia, syn of: Genus Helicocranchia A.L. Massy, 1907 (CRANCHIIDAE)
- Ascolathyrus, syn of: Genus Peristernia O.A.L. Mφrch, 1852 (FASCIOLARIIDAE)
- Ascolatirus, syn of: Genus Peristernia O.A.L. Mφrch, 1852 (FASCIOLARIIDAE)
- ascoldica, Cuspidaria ascoldica O.A. Scarlato, 1972 - (CUSPIDARIIDAE)
- ascoliensis, Helix ascoliensis J.R. Bourguignat, 1879 - syn of: Ambigua signata (A.E.J. Férussac, 1821) - (HELICIDAE)
- Ascorhis, Genus Ascorhis W.F. Ponder & G.A. Clark, 1988 (TATEIDAE)
- Ascoteuthis, syn of: Genus Megalocranchia G.J. Pfeffer, 1884 (CRANCHIIDAE)
- ascotrochus, Arinia ascotrochus J.J. Vermeulen, 1996 - (DIPLOMMATINIDAE)
- asculpta, Plagigeyeria robusta asculpta H. Schütt, 1972 - (HYDROBIIDAE)
- asculpturata, Neamphitomaria asculpturata (P.A. Maxwell, 1966 †) - (AMPHITOMARIIDAE) (FOSSIL)
- asculpturatus, Pseudomalaxis asculpturatus P.A. Maxwell, 1966 † - (ARCHITECTONICIDAE) (FOSSIL)
- aselae, Maoricardium aselae P. Bartsch, 1947 - syn of: Maoricardium setosum (J.H. Redfield, 1846) - (CARDIIDAE)
- asellina, Gibberula asellina (F.P. Jousseaume, 1875) - (CYSTISCIDAE)
- asellina, Marginella asellina F.P. Jousseaume, 1875 - syn of: Gibberula asellina (F.P. Jousseaume, 1875) - (MARGINELLIDAE)
- aselloides, Chiton aselloides R.T. Lowe, 1825 - syn of: Stenosemus albus (C. Linnaeus, 1767) - (CHITONIDAE)
- aselloides, Stenosemus aselloides R.T. Lowe, 1825 - syn of: Stenosemus albus (C. Linnaeus, 1767) - (ISCHNOCHITONIDAE)
- asellus, Arctostrea asellus (Greppin, 1900 †) - (ARCTOSTREIDAE) (FOSSIL)
- asellus, Palmadusta asellus (C. Linnaeus, 1758) - (CYPRAEIDAE)
- asellus, Erronea asellus G.S. Coen, 1949 - syn of: Erronea errones (C. Linnaeus, 1758) - (CYPRAEIDAE)
- asellus, Leptochiton asellus (J.F. Gmelin, 1791) - (LEPTOCHITONIDAE)
- asellus, Natica asellus L.A. Reeve, 1855 - syn of: Notocochlis gualteriana (C.A. Récluz, 1844) - (NATICIDAE)
- asellus bitaeniata, Palmadusta asellus bitaeniata (P. Geret, 1903) - (CYPRAEIDAE)
- asellus latefasciata, Palmadusta asellus latefasciata F.A. Schilder, 1930 - syn of: Palmadusta asellus (C. Linnaeus, 1758) - (CYPRAEIDAE)
- asellus vespacea, Palmadusta asellus vespacea (J.C. Melvill, 1905) - (CYPRAEIDAE)
- asema, Mitrella asema Gardner, 1937 † - (COLUMBELLIDAE) (FOSSIL)
- asemnis, Helix asemnis J.R. Bourguignat, 1860 - (HELICIDAE)
- Aserioceras, Genus Aserioceras Stumbur , 1962 (BARRANDEOCERATIDAE) (FOSSIL)
- asflaensis, Jeanrogericeras asflaensis Meister & al., 2017 † - (ACANTHOCERATIDAE) (FOSSIL)
- Asgardaspira, Genus Asgardaspira Wagner, 1999 (OPHILETIDAE) (FOSSIL)
- asgeirri, Protacanthoceras asgeirri Wright & Kennedy, 1980 † - (ACANTHOCERATIDAE) (FOSSIL)
- asghar, Siphonaria asghar H.E.J. Biggs, 1958 - (SIPHONARIIDAE)
- ashangiensis, Ancylus ashangiensis D.S. Brown, 1965 - (PLANORBIDAE)
- ashburneri, Bathrotomaria ashburneri Cox † - (PLEUROTOMARIIDAE) (FOSSIL)
- ashbyi, Acanthochitona ashbyi E.H.J. Leloup, 1937 - (ACANTHOCHITONIDAE)
- ashbyi, Notoplax ashbyi C.R. Laws, 1932 † - (ACANTHOCHITONIDAE) (FOSSIL)
- ashbyi, Callistochiton ashbyi (K.H. Barnard, 1969) - (CALLISTOPLACIDAE)
- ashbyi, Onithochiton ashbyi W.T. Bednall & E.H. Matthews, 1906 - (CHITONIDAE)
- asheri, Celatoconus asheri E.J. Petuch, 1988 † - (BUCCINIDAE) (FOSSIL)
- asheri, Busycotypus asheri E.J. Petuch, 1988 † - (BUSYCONIDAE) (FOSSIL)
- asheri, Marianarona asheri E.J. Petuch, 1988 † - (CANCELLARIIDAE) (FOSSIL)
- asheri, Conus asheri E.J. Petuch, 1988 † - (CONIDAE) (FOSSIL)
- asheri, Ecphora asheri E.J. Petuch, 1988 † - (MURICIDAE) (FOSSIL)
- asheri, Glossaulax asheri E.J. Petuch, 1988 † - (NATICIDAE) (FOSSIL)
- asheri, Volutifusus asheri E.J. Petuch, 1988 † - (VOLUTIDAE) (FOSSIL)
- Ashfordia, Subgenus Monacha (Ashfordia) J.W. Taylor, 1917 (HYGROMIIDAE)
- Ashfordiini, Genus Ashfordiini Neiber, Razkin & Hausdorf, 2017 (HYGROMIIDAE)
- ashgar, Siphonaria ashgar H.E.J. Biggs, 1958 - syn of: Siphonaria asghar H.E.J. Biggs, 1958 - (SIPHONARIIDAE)
- ashimae, Satsuma ashimae H.A. Pilsbry - (CAMAENIDAE)
- ashiyaensis, Euspira ashiyaensis T. Nagao, 1928 † - syn of: Euspira meisensis J. Makiyama, 1926 † - (NATICIDAE) (FOSSIL)
- ashiyaensis, Chlamys ashiyaensis S. Nomura, 1935 † - (PECTINIDAE) (FOSSIL)
- ashizawaensis, Apiotrigonia ashizawaensis H. Saito, 1962 † - (MEGATRIGONIIDAE) (FOSSIL)
- ashizuriensis, Reinia eastlakeana ashizuriensis M. Azuma, 1968 - (CLAUSILIIDAE)
- ashkhabadensis, Melanopsis ashkhabadensis Z.I. Izzatullaev & Y.I. Starobogatov, 1984 - (MELANOPSIDAE)
- ashlandicus, Pachydiscus ashlandicus (Anderson, 1902 †) - (DESMOCERATIDAE) (FOSSIL)
- ashleyae, Scaphella ashleyae E.J. Petuch, 1994 † - (VOLUTIDAE) (FOSSIL)
- ashleyi, Lirofusus ashleyi R. Arnold, 1908 † - (FASCIOLARIIDAE) (FOSSIL)
- ashleyi, Parahauerites ashleyi (A. Hyatt & Smith, 1905 †) - (KLAMATHITIDAE) (FOSSIL)
- ashleyi, Crassostrea ashleyi L.G. Hertlein, 1943 † - (OSTREIDAE) (FOSSIL)
- ashleyi, Lyropecten ashleyi R. Arnold, 1906 † - syn of: Nodipecten cerrosensis (W.M. Gabb, 1869 †) - (PECTINIDAE) (FOSSIL)
- ashleyi, Semele ashleyi L.G. Hertlein & Grant, 1972 - syn of: Semele rubropicta W.H. Dall, 1871 - (SEMELIDAE)
- ashleyi, Semele ashleyi L.G. Hertlein & J. Grant, 1972 - syn of: Semele rubropicta W.H. Dall, 1871 - (SEMELIDAE)
- ashleyi, Hauerites ashleyi A. Hyatt & Smith, 1905 † - syn of: Parahauerites ashleyi (A. Hyatt & Smith, 1905 †) - (TIBETITIDAE) (FOSSIL)
- ashmorensis, Melo ashmorensis H. Morrison, 2005 - (VOLUTIDAE)
- Ashmunella, Genus Ashmunella H.A. Pilsbry & T.D.A. Cockerell, 1899 (POLYGYRIDAE)
- ashmuni, Immersidens ashmuni (V. Sterki, 1898) - (GASTROCOPTIDAE)
- ashmuni, Sonorella ashmuni P. Bartsch, 1904 - (HELMINTHOGLYPTIDAE)
- ashmuni, Archiphysa ashmuni D.W. Taylor, 2003 - (PHYSIDAE)
- ashmuni, Ashmunella ashmuni (W.H. Dall, 1897) - (POLYGYRIDAE)
- ashmuni, Pisidium ashmuni V. Sterki, 1903 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- ashtamudensis, Turritella ashtamudensis M. Harzhauser, 2014 † - (TURRITELLIDAE) (FOSSIL)
- ashtamudiensis, Retusa ashtamudiensis M. Harzhauser, 2014 † - (RETUSIDAE) (FOSSIL)
- Ashtarotha, Subgenus Astarte (Ashtarotha) Dall, 1903 (ASTARTIDAE) (FOSSIL)
- ashtonense, Donaldina ashtonense Bolton, 1907 † - syn of: Donaldina pulchra (de Koninck, 1881 †) - (DONALDINIDAE) (FOSSIL)
- ashumi, Sonorella ashumi P. Bartsch, 1904 - syn of: Sonorella ashmuni P. Bartsch, 1904 - (HELMINTHOGLYPTIDAE)
- ashurkoffae, Borissiakoceras ashurkoffae Cobban & Gryc 1961 † - (BINNEYITIDAE) (FOSSIL)
- asiana, Sicanites asiana (Ruzhentsev, 1978 †) - (MEDLICOTTIIDAE) (FOSSIL)
- asiana, Vanartinskia asiana Ruzhentsev, 1978 † - syn of: Sicanites asiana (Ruzhentsev, 1978 †) - (MEDLICOTTIIDAE) (FOSSIL)
- Asianites, syn of: Genus Metalegoceras Teichert & Glenister, 1952 (METALEGOCERATIDAE) (FOSSIL)
- asianum, Cancelloceras asianum Ruzhencev & Bogoslovskaya, 1978 † - (GASTRIOCERATIDAE) (FOSSIL)
- asianus, Pseudoemilites asianus Leonova, 1988 † - (ADRIANITIDAE) (FOSSIL)
- asianus, Eoboesites asianus Ruzhencev & Bogoslovskaya, 1978 † - (DARAELITIDAE) (FOSSIL)
- asianus, Chicoreus asianus J.T. Kuroda, 1942 - (MURICIDAE)
- asianus, Neopronorites asianus Leonova, 1988 † - (PRONORITIDAE) (FOSSIL)
- asianus, Alurites asianus Ruzhencev & Bogoslovskaya, 1978 † - (RETICULOCERATIDAE) (FOSSIL)
- Asiapatella, Genus Asiapatella Parkhaev & Demidenko, 2010 (HELCIONELLIDAE) (FOSSIL)
- asiatica, Acanthoceras asiatica Jimbo, 1894 † - (ACANTHOCERATIDAE) (FOSSIL)
- asiatica, Lyapinella asiatica Zakharov † - (ASTARTIDAE) (FOSSIL)
- asiatica, Mauritia asiatica C. Kessler, 2006 - syn of: Mauritia arabica empressae C. Kessler, 2006 - (CYPRAEIDAE)
- asiatica, Mauritia asiatica F.A. Schilder & M. Schilder, 1939 - syn of: Mauritia arabica asiatica F.A. Schilder & M. Schilder, 1939 - (CYPRAEIDAE)
- asiatica, Mauritia arabica asiatica F.A. Schilder & M. Schilder, 1939 - (CYPRAEIDAE)
- asiatica, Eopteria asiatica T. Kobayashi, 1933 † - (EOPTERIIDAE) (FOSSIL)
- asiatica, Eucycloscala asiatica Batten, 1985 † - (EUCYCLOSCALIDAE) (FOSSIL)
- asiatica, Halonympha asiatica I. Hayami & T. Kase, 1993 - (HALONYMPHIDAE)
- asiatica, Hercoglossa asiatica Shimansky, 1975 † - (HERCOGLOSSIDAE) (FOSSIL)
- asiatica, Retispira asiatica (Wirth, 1936 †) - (KNIGHTITIDAE) (FOSSIL)
- asiatica, Leptochondria asiatica Kurushin, 1998 † - (LEIOPECTINIDAE) (FOSSIL)
- asiatica, Limacina asiatica (A.W. Janssen, 2011 †) - (LIMACINIDAE) (FOSSIL)
- asiatica, Jupiteria asiatica Kurushin, 1985 † - (NUCULANIDAE) (FOSSIL)
- asiatica, Zeravschanella asiatica Lyashenko, 1969 † - (PARANOWAKIIDAE) (FOSSIL)
- asiatica, Pirenella asiatica T. Ozawa & D.G. Reid, 2016 - (POTAMIDIDAE)
- asiatica, Hanleyella asiatica B.I. Sirenko, 1973 - (PROTOCHITONIDAE)
- asiatica, Oistotrigonia asiatica (Saveliev, 1958) † - (PTEROTRIGONIIDAE) (FOSSIL)
- asiatica, Barroisocaulus asiatica Gubanov & al., 1995 † - (PTYCHOCAULIDAE) (FOSSIL)
- asiatica, Chrysallida asiatica J.X. Corgan, 1970 - (PYRAMIDELLIDAE)
- asiatica, Terebra asiatica H.C. Ray, 1968 - syn of: Euterebra tantilla (E.A. Smith, 1873) - (TEREBRIDAE)
- asiatica, Utschamiella asiatica C.M. Kolesnikov, 1977 † - (UTSCHAMIELLIDAE) (FOSSIL)
- asiatica, Vallonia asiatica (G. Nevill, 1878) - (VALLONIIDAE)
- asiatica, Clementia asiatica (J.C. Melvill, 1899) - (VENERIDAE)
- asiaticum, Newboldiceras asiaticum (Jimbo, 1894 †) - (ACANTHOCERATIDAE) (FOSSIL)
- asiaticum, Paracrioceras asiaticum (E. Matsumoto, 1947 †) - (ANCYLOCERATIDAE) (FOSSIL)
- asiaticum, Australiceras asiaticum E. Matsumoto, 1947 † - syn of: Paracrioceras asiaticum (E. Matsumoto, 1947 †) - (ANCYLOCERATIDAE) (FOSSIL)
- asiaticum, Cambridium asiaticum Koneva, 1979 † - (CAMBRIDIIDAE) (FOSSIL)
- asiaticum, Vepricardium asiaticum (J.G. Bruguière, 1789) - (CARDIIDAE)
- asiaticum, Trachycardium asiaticum J.G. Bruguière, 1789 - syn of: Vepricardium asiaticum (J.G. Bruguière, 1789) - (CARDIIDAE)
- asiaticum, Flowerites asiaticum P.A. Zhuravleva, 1972 † - syn of: Carotites procerus P.A. Zhuravleva, 1972 † - (DISCOSORIDA (unassigned)) (FOSSIL)
- asiaticum, Eogonioloboceras asiaticum (Librovitch, 1940 †) - (EOGONIOLOBOCERATIDAE) (FOSSIL)
- asiaticum, Karsteniceras asiaticum (Yabe & Shimizu, 1927 †) - (LEPTOCERATOIDIDAE) (FOSSIL)
- asiaticum, Propinacoceras asiaticum Toumanskaya, 1949 † - (MEDLICOTTIIDAE) (FOSSIL)
- asiaticum, Stohleroma asiaticum C.N. Cate, 1973 - syn of: Sandalia triticea (J.B.P.A. Lamarck, 1810) - (OVULIDAE)
- asiaticum, Rotodiscoceras asiaticum Chao & X.L. Liang, 1966 † - (PLEURONODOCERATIDAE) (FOSSIL)
- asiaticum, Pseudosvalbardiceras asiaticum (Zakharov, 1978 †) - (SIBIRITIDAE) (FOSSIL)
- asiaticum, Sphaerium asiaticum (E.C. Von Martens, 1864) - (SPHAERIIDAE)
- asiaticum caperata, Sphaerium asiaticum caperata C.A. Westerlund, 1897 - syn of: Sphaerium asiaticum (E.C. Von Martens, 1864) - (SPHAERIIDAE)
- asiaticum spinosum, Newboldiceras asiaticum spinosum (Kossmat, 1897 †) - (ACANTHOCERATIDAE) (FOSSIL)
- asiaticum wyomingense, Newboldiceras asiaticum wyomingense (Cobban, 1988 †) - (ACANTHOCERATIDAE) (FOSSIL)
- asiaticus, Ataphrus asiaticus J.H.F. Douvillé, 1916 † - (ATAPHRIDAE) (FOSSIL)
- asiaticus, Aviculopecten asiaticus de Koninck, 1863 † - (AVICULOPECTINIDAE) (FOSSIL)
- asiaticus, Waagenella asiaticus (F.A. Roemer, 1880 †) - (BELLEROPHONTIDAE) (FOSSIL)
- asiaticus, Phasmoconus asiaticus (A.J. Da Motta, 1985) - (CONIDAE)
- asiaticus, Heligmus asiaticus Douville, 1916 † - (ELIGMIDAE) (FOSSIL)
- asiaticus, Pseudonapaeus asiaticus (E.C. Von Martens, 1881) - (ENIDAE)
- asiaticus, Costigymnites asiaticus Krystyn & Tatzreiter, 1991 † - (GYMNITIDAE) (FOSSIL)
- asiaticus, Paranautilus asiaticus E.S. Sobolev, 1989 † - (LIROCERATIDAE) (FOSSIL)
- asiaticus, Vitularia asiaticus J.T. Kuroda in T. Kira, 1962 - syn of: Vitularia miliaris (J.F. Gmelin, 1791) - (MURICIDAE)
- asiaticus, Nodopericyclus asiaticus Konovalova, 2015 † - (PERICYCLIDAE) (FOSSIL)
- asiaticus, Ammonellipsites asiaticus Librovitch, 1940 † - (PERICYCLIDAE) (FOSSIL)
- asiaticus, Pseudotirolites asiaticus (Jaekel, 1929 †) - (PSEUDOTIROLITIDAE) (FOSSIL)
- asiaticus, Spondylus asiaticus J.C. Chenu, 1844 - (SPONDYLIDAE)
- asiaticus lovellreevei, Phasmoconus asiaticus lovellreevei G. Raybaudi Massilia, 1993 - (CONIDAE)
- asiaticus regeliana, Buliminus asiaticus regeliana C.M.F. Ancey, 1886 - syn of: Pseudonapaeus regelianus (C.M.F. Ancey, 1886) - (ENIDAE)
- Asiatotrigonia, Genus Asiatotrigonia Cox, 1952 (TRIGONIIDA (UNASSIGNED)) (FOSSIL)
- asientosensis, Goniomya asientosensis Aberhan, 2004 † - (PHOLADOMYIDAE) (FOSSIL)
- Asijatheca, Genus Asijatheca Missarzhevsky & Mambetov, 1981 (TETRATHECIDAE) (FOSSIL)
- asinaria, Nippononaia asinaria (Reeside, 1957 †) - (NIPPONONAIIDAE) (FOSSIL)
- asinaria, Americunio asinaria Reeside, 1957 † - syn of: Nippononaia asinaria (Reeside, 1957 †) - (TRIGONIOIDIDAE) (FOSSIL)
- asinina, Haliotis asinina C. Linnaeus, 1758 - (HALIOTIDAE)
- Asinomphalus, Genus Asinomphalus Hornύ, 1992 (TYCHOBRAHEIDAE) (FOSSIL)
- asinorum, Badiofaux asinorum C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- asinuata, Gaimardia asinuata C.R. Laws, 1940 † - (GAIMARDIIDAE) (FOSSIL)
- asinum, Haliotis asinum E. Donovan, 1808 - syn of: Haliotis asinina C. Linnaeus, 1758 - (HALIOTIDAE)
- asinus, Hippopus asinus J. Barbut, 1788 - syn of: Hippopus hippopus (C. Linnaeus, 1758) - (TRIDACNIDAE)
- asinusoides, Pteroperna asinusoides Fischer, 1969 † - (PTERIIDAE) (FOSSIL)
- Asiocyclas, syn of: Genus Sphaerium J.A. Scopoli, 1777 (SPHAERIIDAE)
- Asiomusculium, syn of: Genus Sphaerium J.A. Scopoli, 1777 (SPHAERIIDAE)
- asiphon, Rhiostoma asiphon (O.F. von Möllendorff, 1894) - (CYCLOPHORIDAE)
- asiphonia, Siphonophaedusa grangeri asiphonia H. Nordsieck, 2007 - (CLAUSILIIDAE)
- asirensis, Truncatellina asirensis B. Hausdorf & T. Wronski, 2011 - (VERTIGINIDAE)
- Askeanoceras, syn of: Genus Askeatonoceras Turner, 1966 (AIPOCERATIDAE) (FOSSIL)
- Askeatonoceras, Genus Askeatonoceras Turner, 1966 (AIPOCERATIDAE) (FOSSIL)
- Askeatonolucidum, Genus Askeatonolucidum (NAUTILIDA (UNASSIGNED)) (FOSSIL)
- askerense, Antiplectoceras askerense E. Strand, 1934 † - (BARRANDOCERATIDAE) (FOSSIL)
- askerense, Danoceras askerense (E. Strand, 1933 †) - (DIESTOCERATIDAE) (FOSSIL)
- askerense, Westonoceras askerense E. Strand, 1933 † - syn of: Danoceras askerense (E. Strand, 1933 †) - (WESTONOCERATIDAE) (FOSSIL)
- askeri, Lambeoceras askeri Sweet, 1958 † - (GONIOCERATIDAE) (FOSSIL)
- askeri, Hoeloceras askeri Sweet, 1958 † - (LAMBEOCERATIDAE) (FOSSIL)
- asketa, Superba skipetarica asketa (P. Subai, 1995) - (HELICIDAE)
- Asketochiton, Genus Asketochiton Hoare & Sabattini, 2000 (LEPTOCHITONIDAE) (FOSSIL)
- Asketomorpha, Genus Asketomorpha Hoare & al., 1989 (GRAMMYSIIDAE) (FOSSIL)
- askewi, Kaiparapelta askewi J.H. McLean & M.G. Harasewych, 1995 - (PSEUDOCOCCULINIDAE)
- askewi, Fusconaia askewi (W.A. Marsh, 1896) - (UNIONIDAE)
- Asklepioceras, Genus Asklepioceras Renz , 1911 (TRACHYCERATIDAE) (FOSSIL)
- Askoloboceras, syn of: Genus Hysteroceras Hyatt , 1900 (BRANCOCERATIDAE) (FOSSIL)
- askoyana, Eurytellina eburnea askoyana L.G. Hertlein & A.M. Strong, 1955 - (TELLINIDAE)
- aslini, Turgenitubulus aslini G.A. Solem, 1985 - (CAMAENIDAE)
- aslini, Austropyrgus aslini A. Clark, W.B. Miller & W.F. Ponder, 2003 - (HYDROBIIDAE)
- aslini, Pisidium aslini J.G.J. Kuiper, 1983 - (SPHAERIIDAE)
- Aslintesta, Genus Aslintesta G.A. Solem, 1992 (CAMAENIDAE)
- Asmena, syn of: Genus Melanopsis A.E.J. Fιrussac, 1807 (MELANOPSIDAE)
- asmenus, Afsharius asmenus (J.C. Melvill & R. Standen, 1907) - (TELLINIDAE)
- asmi, Acmaea asmi A.T. von Middendorff, 1847 - syn of: Lottia asmi (A.T. von Middendorff, 1847) - (ACMAEIDAE)
- asmi, Lottia asmi (A.T. von Middendorff, 1847) - (LOTTIIDAE)
- Asmida, syn of: Genus Arctica H.C.F. Schumacher, 1817 (ARCTICIDAE)
- Asmidia, syn of: Genus Arctica H.C.F. Schumacher, 1817 (ARCTICIDAE)
- asmiiformis, Acmaea asmiiformis M. Yokoyama, 1926 † - (ACMAEIDAE) (FOSSIL)
- Asmunda, Subgenus Turbonilla (Asmunda) W.H. Dall & P. Bartsch, 1904 (PYRAMIDELLIDAE)
- asmundinus, Pyrgiscus asmundinus (E. Saurin, 1959) - (PYRAMIDELLIDAE)
- Asoella, Subgenus Eumorphotis (Asoella) Tokuyama, 1959 (HETEROPECTINIDAE) (FOSSIL)
- Asolene, Genus Asolene D'Orbigny, 1837 (AMPULLARIIDAE)
- asopeus, Bulimus asopeus J. Gassies, 1871 - syn of: Placostylus fibratus (T. Martyn, 1784) - (BULIMULIDAE)
- asopis, Columbella asopis P.L. Duclos, 1846 - (COLUMBELLIDAE)
- Aspa, Genus Aspa H. Adams & A. Adams, 1853 (BURSIDAE)
- Aspalima, Genus Aspalima T. Iredale, 1929 (LIMOPSIDAE)
- aspasia, Cucullaea aspasia A.V.M.D. D'Orbigny, 1849 - (CUCULLAEIDAE)
- aspasia, Euhoplites aspasia (Spath 1925 †) - (HOPLITIDAE) (FOSSIL)
- aspasia, Myoconcha aspasia d'Orbigny, 1850 † - (KALENTERIDAE) (FOSSIL)
- aspasia, Semele aspasia G.F. Angas, 1879 - syn of: Semele carnicolor (S.C.T. Hanley, 1845) - (SEMELIDAE)
- Aspasita, Subgenus Spelaeodiscus (Aspasita) C.A. Westerlund, 1889 (SPELAEODISCIDAE)
- aspasta, Helix aspasta C.A. Westerlund, 1896 - syn of: Cathaica cavimargo (E.C. Von Martens, 1879) - (HELICIDAE)
- Aspastus, Genus Aspastus J.A. Albers, 1850 (BOTHRIEMBRYONTIDAE)
- Aspatharia, Genus Aspatharia J.R. Bourguignat, 1885 (IRIDINIDAE)
- aspecta, Margarites aspecta (H. Adams & A. Adams, 1854) - (MARGARITIDAE)
- aspecta, Leda aspecta W.H. Dall, 1927 - syn of: Ledella parva A.E. Verrill & K.J. Bush, 1897 - (NUCULANIDAE)
- aspecta, Nuculana aspecta W.H. Dall, 1927 - syn of: Ledella parva A.E. Verrill & K.J. Bush, 1897 - (NUCULANIDAE)
- aspectulabeatidis, Virpazaria aspectulabeatidis A. Reischütz, P.L. Reischütz & P. Subai, 2009 - (SPELAEODISCIDAE)
- Aspella, Genus Aspella O.A.L. Mφrch, 1877 (MURICIDAE)
- aspenanum, Metengonoceras aspenanum Reeside & Weymouth, 1931 † - (ENGONOCERATIDAE) (FOSSIL)
- aspenensis, Paranannites aspenensis A. Hyatt & Smith, 1905 † - (MELAGATHICERATIDAE) (FOSSIL)
- aspeniana, Gosseletina aspeniana Girty, 1927 † - (GOSSELETINIDAE) (FOSSIL)
- Aspenites, Genus Aspenites Hyatt & Smith, 1905 (ASPENITIDAE) (FOSSIL)
- ASPENITIDAE Spath, 1934 - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-CERATITIDA [Order]-SAGECERATOIDEA [Superfamily]) (FOSSIL)
- aspenwallensis, Edmondia aspenwallensis F.B. Meek, 1871 † - (EDMONDIIDAE) (FOSSIL)
- asper, Heliacus asper R.B. Hinds, 1844 - syn of: Granosolarium asperum (R.B. Hinds, 1844) - (ARCHITECTONICIDAE)
- asper, Baculites asper Morton, 1830 † - (BACULITIDAE) (FOSSIL)
- asper, Penion asper (J. Marwick, 1928 †) - (BUCCINIDAE) (FOSSIL)
- asper, Amphidromus asper F. Haas, 1934 - syn of: Amphidromus mirandus A.R.J.B. Bavay & P. Dautzenberg, 1912 - (CAMAENIDAE)
- asper, Rhinoclavis asper P. Forsskål, 1775 - syn of: Rhinoclavis aspera (C. Linnaeus, 1758) - (CERITHIIDAE)
- asper, Euchelus asper (J.F. Gmelin, 1791) - (CHILODONTIDAE)
- asper, Conus asper J.B.P.A. Lamarck, 1810 - syn of: Asprella sulcata (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- asper, Donax asper A.A. Olsson, 1961 - (DONACIDAE)
- asper, Assimilidonax asper S.C.T. Hanley, 1845 - syn of: Donax asper A.A. Olsson, 1961 - (DONACIDAE)
- asper, Fusinus asper J. de C. Sowerby, 1821 † - (FASCIOLARIIDAE) (FOSSIL)
- asper, Aoteadrillia asper (J. Marwick, 1931 †) - (HORAICLAVIDAE) (FOSSIL)
- asper, Guraleus asper C.F. Laseron, 1954 - (MANGELIIDAE)
- asper, Murexsul asper R. Houart, 2004 - (MURICIDAE)
- asper, Rhizochilus asper A. Adams, 1855 - syn of: Coralliophila aspera (A. Adams, 1855) - (MURICIDAE)
- asper, Babelomurex asper A. Adams, 1855 - syn of: Coralliophila aspera (A. Adams, 1855) - (MURICIDAE)
- asper, Arcomytilus asper (Sowerby, 1818 †) - (MYTILIDAE) (FOSSIL)
- asper, Paracymatoceras asper (Oppel, 1868 †) - (NAUTILIDAE) (FOSSIL)
- asper, Malbosiceras asper Mazenot, 1939 † - syn of: Lopeziceras chaperi (Pictet, 1868 †) - (NEOCOMITIDAE) (FOSSIL)
- asper, Paroctopus asper I.I. Akimushkin, 1963 - syn of: Enteroctopus dofleini (G. Wülker, 1910) - (OCTOPODIDAE)
- asper, Pecten asper J.B.P.A. Lamarck, 1819 † - (PECTINIDAE) (FOSSIL)
- asper, Chlamys asper Sowerby, 1847 - (PECTINIDAE)
- asper, Triphora asper G.P. Deshayes, 1864 † - (TRIPHORIDAE) (FOSSIL)
- asper, Trochus asper J.F. Gmelin, 1791 - syn of: Euchelus asper (J.F. Gmelin, 1791) - (TROCHIDAE)
- asper, Pleurofusia decliva asper McNeil, 1984 † - (TURRIDAE) (FOSSIL)
- asper, Unio asper I. Lea, 1831 - syn of: Quadrula apiculata T. Say, 1829 - (UNIONIDAE)
- asper, Stephopoma asper R. Tate, 1893 † - (VERMETIDAE) (FOSSIL)
- asper decorata, Triphora asper decorata É.A.A. Locard, 1897 - syn of: Strobiligera brychia (P. Bouchet & H. Guillemot, 1978) - (TRIPHORIDAE)
- asper quadricarinatus, Euchelus asper quadricarinatus (H.S. Holten, 1802) - (CHILODONTIDAE)
- aspera, Rictaxis aspera (J.B.P.A. Lamarck) - (ACTEONIDAE)
- aspera, Laminella aspera D.D. Baldwin, 1908 - (AMASTRIDAE)
- aspera, Anatoma aspera (R.A. Philippi, 1844) - (ANATOMIDAE)
- aspera, Anomia aspera R.A. Philippi, 1844 - syn of: Anomia ephippium C. Linnaeus, 1758 - (ANOMIIDAE)
- aspera, Torinia aspera R.B. Hinds, 1844 - syn of: Granosolarium asperum (R.B. Hinds, 1844) - (ARCHITECTONICIDAE)
- aspera, Barbatia aspera (T.A. Conrad, 1854 †) - (ARCIDAE) (FOSSIL)
- aspera, Acar aspera T.A. Conrad, 1854 † - syn of: Barbatia aspera (T.A. Conrad, 1854 †) - (ARCIDAE) (FOSSIL)
- aspera, Barbatia aspera R.A. Philippi, 1844 - syn of: Asperarca nodulosa (O.F. Müller, 1776) - (ARCIDAE)
- aspera, Pseudaneitea aspera D.W. Burton, 1963 - (ATHORACOPHORIDAE)
- aspera, Chrysallis aspera J.P.S. Grateloup, 1840 - syn of: Chrysallis aspersa (J.P.S. Grateloup, 1840) - (BRADYBAENIDAE)
- aspera, Bulla aspera Adams, 1850 - syn of: Bulla gouldiana H.A. Pilsbry, 1895 - (BULLIDAE)
- aspera, Adacna aspera A. Ostroumoff, 1905 - syn of: Adacna vitrea (K.E.I. von Eichwald, 1829) - (CARDIIDAE)
- aspera, Carditamera aspera (J.B.P.A. Lamarck, 1805 †) - (CARDITIDAE) (FOSSIL)
- aspera, Rhinoclavis aspera (C. Linnaeus, 1758) - (CERITHIIDAE)
- aspera, Doris aspera J.J. Risbec, 1928 - (DORIDIDAE)
- aspera, Doris aspera J. Alder & A. Hancock, 1842 - syn of: Onchidoris muricata (O.F. Müller, 1776) - (DORIDIDAE)
- aspera, Diodora aspera (J. Rathke, 1833) - (FISSURELLIDAE)
- aspera, Emarginula aspera Gould, 1852 - syn of: Montfortula rugosa (J.R.C. Quoy & J.P. Gaimard, 1834) - (FISSURELLIDAE)
- aspera, Dictyobembix aspera (Sedgwick & Murchison, 1840 †) - (GOSSELETINIDAE) (FOSSIL)
- aspera, Helcionella aspera (Noetling, 1894 †) - (HELCIONELLIDAE) (FOSSIL)
- aspera, Helix aspera A.E.J. Férussac, 1821 - syn of: Thelidomus aspera (A.E.J. Férussac, 1821) - (HELICIDAE)
- aspera, Pyrgula aspera Š. Brusina, 1878 † - (HYDROBIIDAE) (FOSSIL)
- aspera, Limatulina aspera C. Gemmellaro, 1896 † - (LIMATULINIDAE) (FOSSIL)
- aspera, Lima aspera K.H.J. Thiele, 1918 - syn of: Ctenoides scaber (I. von Born, 1778) - (LIMIDAE)
- aspera, Echinolittorina aspera (R.A. Philippi, 1846) - (LITTORINIDAE)
- aspera, Nodilittorina aspera R.A. Philippi, 1846 - syn of: Echinolittorina aspera (R.A. Philippi, 1846) - (LITTORINIDAE)
- aspera, Loligo aspera A.E. Ortmann, 1888 - (LOLIGINIDAE)
- aspera, Lophospira aspera Billings, 1859 † - syn of: Lophospira milleri (Miller, 1877 †) - (LOPHOSPIRIDAE) (FOSSIL)
- aspera, Mitromorpha aspera (P.P. Carpenter, 1864) - (MITROMORPHIDAE)
- aspera, Morula aspera (J.B.P.A. Lamarck, 1816) - (MURICIDAE)
- aspera, Coralliophila aspera (A. Adams, 1855) - (MURICIDAE)
- aspera, Vitularia aspera W. Baird, 1863 - syn of: Ocinebrina lurida (A.T. von Middendorff, 1848) - (MURICIDAE)
- aspera, Nassaria aspera (J.T. Kuroda, 1961) - (NASSARIIDAE)
- aspera, Lamellidoris aspera J. Alder & A. Hancock, 1842 - syn of: Onchidoris muricata (O.F. Müller, 1776) - (ONCHIDORIDIDAE)
- aspera, Ovula aspera G. Perry, 1811 - syn of: Volva volva (C. Linnaeus, 1758) - (OVULIDAE)
- aspera, Volva aspera G. Perry, 1811 - syn of: Volva volva (C. Linnaeus, 1758) - (OVULIDAE)
- aspera, Pirena aspera A. Brot, 1862 - syn of: Madagasikara spinosa (J.B.P.A. Lamarck, 1819) - (PACHYCHILIDAE)
- aspera, Patella aspera P.F. Röding, 1798 - (PATELLIDAE)
- aspera, Serratovola rubicunda aspera (G.B. Sowerby, 1842) - (PECTINIDAE)
- aspera, Volutomorpha aspera W.H. Dall, 1907 † - (PHOLIDOTOMIDAE) (FOSSIL)
- aspera, Phymatopleura aspera Sedgwick & Murchison, 1840 † - syn of: Dictyobembix aspera (Sedgwick & Murchison, 1840 †) - (PHYMATOPLEURIDAE) (FOSSIL)
- aspera, Paragoniozona aspera F.B. Meek & A.H. Worthen, 1860 † - syn of: Paragoniozona granulostriata (F.B. Meek & A.H. Worthen, 1860 †) - (PHYMATOPLEURIDAE) (FOSSIL)
- aspera, Thelidomus aspera (A.E.J. Férussac, 1821) - (PLEURODONTIDAE)
- aspera, Pleurotomaria aspera Girty, 1934 † - syn of: Paragoniozona granulostriata (F.B. Meek & A.H. Worthen, 1860 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- aspera, Tropidophora aspera (V.L.V. Potiez & A. Michaud, 1838) - (POMATIIDAE)
- aspera, Pommerozygia aspera Grundel, 1999 † - (POMMEROZYGIIDAE) (FOSSIL)
- aspera, Purpurina aspera Hudleston † - (PURPURINIDAE) (FOSSIL)
- aspera, Turbonilla aspera J.T. Kuroda & T. Habe, 1971 - (PYRAMIDELLIDAE)
- aspera, Odostomia aspera S. Nomura, 1938 - (PYRAMIDELLIDAE)
- aspera, Daphnella aspera P.P. Carpenter, 1864 - syn of: Mitromorpha aspera (P.P. Carpenter, 1864) - (RAPHITOMIDAE)
- aspera, Alvania aspera (R.A. Philippi, 1844) - (RISSOIDAE)
- aspera, Rissoina aspera M.J. Faber, 2013 - (RISSOINIDAE)
- aspera, Scissurella aspera R.A. Philippi, 1844 - syn of: Scissurella costata d'Orbigny, 1824 - (SCISSURELLIDAE)
- aspera, Siphonaria serrata aspera C.F.F. von Krauss, 1848 - (SIPHONARIIDAE)
- aspera, Terebra aspera R.B. Hinds, 1844 - syn of: Pristiterebra petiveriana (G.P. Deshayes, 1857) - (TEREBRIDAE)
- aspera, Triphora aspera G.P. Deshayes, 1864 † - (TRIPHORIDAE) (FOSSIL)
- aspera, Strobiligera aspera J.G. Jeffreys, 1885 - syn of: Strobiligera brychia (P. Bouchet & H. Guillemot, 1978) - (TRIPHORIDAE)
- aspera, Thalotia aspera J.T. Kuroda & T. Habe, 1952 - syn of: Tosatrochus attenuatus (I.H. Jonas, 1844) - (TROCHIDAE)
- aspera, Turritella aspera E. Sismonda in C. Mayer, 1868 - (TURRITELLIDAE)
- aspera, Quadrula aspera I. Lea, 1861 - syn of: Quadrula apiculata T. Say, 1829 - (UNIONIDAE)
- aspera, Urocoptis aspera (C.B. Adams, 1849) - (UROCOPTIDAE)
- aspera, Dosinia aspera (L.A. Reeve, 1850) - (VENERIDAE)
- aspera, Venerupis aspera (J.R.C. Quoy & J.P. Gaimard, 1835) - (VENERIDAE)
- aspera, Venus aspera J.R.C. Quoy & J.P. Gaimard, 1835 - syn of: Venerupis aspera (J.R.C. Quoy & J.P. Gaimard, 1835) - (VENERIDAE)
- aspera, Columella aspera H.W. Waldén, 1966 - (VERTIGINIDAE)
- aspera crispata, Anatoma aspera crispata J. Fleming, 1828 - syn of: Anatoma crispata (Fleming, 1828) - (ANATOMIDAE)
- aspera gracilior, Mitromorpha aspera gracilior G.W. Tryon, 1884 - syn of: Mitromorpha gracilior (G.W. Tryon, 1884) - (MITROMORPHIDAE)
- aspera kioroshiensis, Venerupis aspera kioroshiensis K. Hirayama & Y. Ando, 1954 † - (VENERIDAE) (FOSSIL)
- asperacrispata, Chlamys asperacrispata Tashiro, 1976 † - (PECTINIDAE) (FOSSIL)
- asperaeformis, Spisula asperaeformis S. Nomura & N. Zinbo, 1934 - (MACTRIDAE)
- asperaense, Phylloceras asperaense Hillebrandt, 2000 † - (PHYLLOCERATIDAE) (FOSSIL)
- Asperarca, Genus Asperarca F. Sacco, 1898 (ARCIDAE)
- asperata, Hemizaptyx asperata (H.A. Pilsbry, 1905) - (CLAUSILIIDAE)
- asperata, Nerita asperata F. Dujardin, 1837 † - (NERITIDAE) (FOSSIL)
- asperata, Jagora asperata (J.B.P.A. Lamarck, 1822) - (PACHYCHILIDAE)
- asperata, Doryssa asperata J.B.P.A. Lamarck, 1822 - syn of: Jagora asperata (J.B.P.A. Lamarck, 1822) - (PACHYCHILIDAE)
- asperata, Brotia asperata J.B.P.A. Lamarck, 1822 - syn of: Jagora asperata (J.B.P.A. Lamarck, 1822) - (PACHYCHILIDAE)
- asperata, Wrightudora asperata (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- asperata, Melania asperata J.B.P.A. Lamarck, 1822 - syn of: Jagora asperata (J.B.P.A. Lamarck, 1822) - (THIARIDAE)
- asperata, Amphinaias asperata (I. Lea, 1861) - (UNIONIDAE)
- asperata, Cylindrella asperata G.B. Sowerby, 1875 - syn of: Simplicervix inornata (C.B. Adams, 1849) - (UROCOPTIDAE)
- asperatus, Naesiotus asperatus J.A. Albers, 1857 - (BULIMULIDAE)
- asperatus, Eocamptonectes asperatus (Girty, 1909 †) - (DELTOPECTINIDAE) (FOSSIL)
- asperatus, Stylotrochus asperatus G. Seguenza, 1876 - syn of: Iphitus tuberatus (J.G. Jeffreys, 1883) - (NYSTIELLIDAE)
- asperatus, Camptonectes asperatus Girty, 1909 † - syn of: Eocamptonectes asperatus (Girty, 1909 †) - (PECTINIDAE) (FOSSIL)
- aspercella, Merica aspercella J.B.P.A. Lamarck, 1822 - syn of: Merica asperella (J.B.P.A. Lamarck, 1822) - (CANCELLARIIDAE)
- Asperconella, Genus Asperconella Landing & Bartowski, 1996 (HELCIONELLIDAE) (FOSSIL)
- Asperdaphne, Genus Asperdaphne C. Hedley, 1922 (RAPHITOMIDAE)
- asperedolata, Turbonilla asperedolata C.R. Laws, 1940 † - (PYRAMIDELLIDAE) (FOSSIL)
- asperella, Trachia asperella (L. Pfeiffer, 1846) - (CAMAENIDAE)
- asperella, Merica asperella (J.B.P.A. Lamarck, 1822) - (CANCELLARIIDAE)
- asperella, Chama asperella J.B.P.A. Lamarck, 1819 - (CHAMIDAE)
- Asperella, syn of: Genus Asprella L.W. Schaufuss, 1869 (CONIDAE)
- asperella, Fissurella asperella G.B. I Sowerby, 1835 - (FISSURELLIDAE)
- asperella fibula, Chama asperella fibula (L.A. Reeve, 1846) - (CHAMIDAE)
- asperella hendersoni, Chama asperella hendersoni W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - (CHAMIDAE)
- aspergata, Bouchetriphora aspergata (C.F. Laseron, 1958) - (TRIPHORIDAE)
- aspergata, Coriophora aspergata C.F. Laseron, 1958 - syn of: Bouchetriphora aspergata (C.F. Laseron, 1958) - (TRIPHORIDAE)
- aspergilloides, Uperotus aspergilloides E. Forbes, 1846 - (TEREDINIDAE)
- Aspergillum, syn of: Genus Brechites J.Ι. Guettard, 1770 (PENICILLIDAE)
- asperi, Pisidium asperi S. Clessin, 1883 - syn of: Pisidium personatum A.W. Malm, 1855 - (SPHAERIIDAE)
- asperiformis, Baculites asperiformis F.B. Meek, 1876 † - (BACULITIDAE) (FOSSIL)
- Asperilla, Subgenus Platyacra (Asperilla) Koken, 1896 (CIRRIDAE) (FOSSIL)
- asperimma, Raphitoma asperimma T. Brown, 1827 - syn of: Raphitoma echinata (G.B. Brocchi, 1814) - (RAPHITOMIDAE)
- asperior, Chaetopleura asperior (P.P. Carpenter in H.A. Pilsbry, 1892) - (CHAETOPLEURIDAE)
- asperior, Chaetopleura asperior P.P. Carpenter in H.A. Pilsbry, 1892 - syn of: Chaetopleura asperior (P.P. Carpenter in H.A. Pilsbry, 1892) - (CHAETOPLEURIDAE)
- Asperiscala, syn of: Genus Epitonium P.F. Rφding, 1798 (EPITONIIDAE)
- Asperiscala, syn of: Genus Epitonium P.F. Rφding, 1798 (EPITONIIDAE)
- Asperitas, Genus Asperitas G.P.L.K. Gude, 1911 (DYAKIIDAE)
- Asperoconus, Genus Asperoconus Yό, 1979 (IGARKIELLIDAE) (FOSSIL)
- asperoides, Alabina asperoides (W.M. Gabb, 1873 †) - (CERITHIIDAE) (FOSSIL)
- asperoides canaliculata, Alabina asperoides canaliculata (W.M. Gabb, 1873 †) - (CERITHIIDAE) (FOSSIL)
- asperostriata, Straparollina asperostriata (Billings, 1860 †) - (STRAPAROLLINIDAE) (FOSSIL)
- Asperoteuthis, Genus Asperoteuthis K.N. Nesis, 1980 (CHIROTEUTHIDAE)
- asperrima, Bursa asperrima R.W. Dunker, 1862 - (BURSIDAE)
- asperrima, Glyptorhagada asperrima C. Hedley, 1905 - (CAMAENIDAE)
- asperrima, Chaetopleura asperrima (A.A. Gould, 1852 ex J.P. Couthouy MS) - (CHAETOPLEURIDAE)
- asperrima, Dentistyla asperrima (W.H. Dall, 1881) - (CHILODONTIDAE)
- asperrima, Turrella asperrima C.F. Laseron, 1954 - (CLATHURELLIDAE)
- asperrima, Margarites asperrima W.H. Dall, 1881 - syn of: Dentistyla asperrima (W.H. Dall, 1881) - (MARGARITIDAE)
- asperrima, Coralliophila asperrima H. Adams & A. Adams, 1863 - syn of: Coralliophila costularis (J.B.P.A. Lamarck, 1816) - (MURICIDAE)
- asperrima, Mimachlamys asperrima (J.B.P.A. Lamarck, 1819) - (PECTINIDAE)
- asperrima, Raphitoma purpurea asperrima (G. Montagu, 1803) - (RAPHITOMIDAE)
- asperrima, Alvania subareolata asperrima (T.A. de M. Monterosato, 1875) - (RISSOIDAE)
- asperrima, Solariella asperrima W.H. Dall, 1881 - syn of: Dentistyla asperrima (W.H. Dall, 1881) - (SOLARIELLIDAE)
- asperrima, Tellina asperrima S.C.T. Hanley, 1844 - (TELLINIDAE)
- asperrima, Inella asperrima (R.B. Hinds, 1843) - (TRIPHORIDAE)
- asperrima, Leukoma asperrima (Sowerby, 1835) - (VENERIDAE)
- asperrima, Venus asperrima G.B. I Sowerby, 1835 - syn of: Leukoma asperrima (Sowerby, 1835) - (VENERIDAE)
- asperrimoides, Chlamys asperrimoides A.W.B. Powell, 1958 - syn of: Mimachlamys sanguinea (C. Linnaeus, 1758) - (PECTINIDAE)
- asperrimus, Chiton asperrimus A.A. Gould, 1852 ex J.P. Couthouy MS - syn of: Chaetopleura asperrima (A.A. Gould, 1852 ex J.P. Couthouy MS) - (CHITONIDAE)
- asperrimus, Fusus asperrimus W.E. Leach in T. Brown, 1827 - syn of: Trophonopsis muricata (G. Montagu, 1803) - (FASCIOLARIIDAE)
- asperrimus, Murex asperrimus J.B.P.A. Lamarck, 1822 - syn of: Phyllonotus pomum (J.F. Gmelin, 1791) - (MURICIDAE)
- asperrimus, Chlamys asperrimus † - (PECTINIDAE) (FOSSIL)
- asperrimus, Spondylus asperrimus G.B. II Sowerby, 1847 - (SPONDYLIDAE)
- asperrimus, Unio asperrimus I. Lea, 1831 - syn of: Quadrula quadrula C.S. Rafinesque, 1820 - (UNIONIDAE)
- aspersa, Chrysallis aspersa (J.P.S. Grateloup, 1840) - (BRADYBAENIDAE)
- aspersa, Siphonalia aspersa J.T. Kuroda & T. Habe in T. Habe, 1961 - (BUCCINIDAE)
- aspersa, Bulla aspersa A. Adams, 1850 - syn of: Bulla punctulata A. Adams in G.B. II Sowerby, 1850 - (BULLIDAE)
- aspersa, Papyridea aspersa (G.B. I Sowerby, 1833) - (CARDIIDAE)
- aspersa, Rhinoclavis aspersa C. Linnaeus, 1758 - syn of: Rhinoclavis aspera (C. Linnaeus, 1758) - (CERITHIIDAE)
- aspersa, Chama aspersa L.A. Reeve, 1846 - (CHAMIDAE)
- aspersa, Herpetopoma aspersa (R.A. Philippi, 1846) - (CHILODONTIDAE)
- aspersa, Chromodoris aspersa (A.A. Gould, 1852) - (CHROMODORIDIDAE)
- aspersa, Pardalinops aspersa (G.B. II Sowerby, 1844) - (COLUMBELLIDAE)
- aspersa, Doris aspersa A.A. Gould, 1852 - syn of: Chromodoris aspersa (A.A. Gould, 1852) - (DORIDIDAE)
- aspersa, Glycymeris aspersa (A. Adams & L.A. Reeve, 1850) - (GLYCYMERIDIDAE)
- aspersa, Okenia aspersa (J. Alder & A. Hancock, 1845) - (GONIODORIDIDAE)
- aspersa, Goniodoris aspersa J. Alder & A. Hancock, 1864 - (GONIODORIDIDAE)
- aspersa, Helicina aspersa L. Pfeiffer, 1839 - syn of: Helicina adspersa L. Pfeiffer, 1839 - (HELICINIDAE)
- aspersa, Micrarionta aspersa H.A. Pilsbry, 1913 - syn of: Micrarionta areolata (G.B. III Sowerby in L. Pfeiffer, 1845) - (HELMINTHOGLYPTIDAE)
- aspersa, Oxyperas aspersa (G.B. I Sowerby, 1825) - (MACTRIDAE)
- aspersa, Spisula aspersa G.B. I Sowerby, 1825 - syn of: Oxyperas aspersa (G.B. I Sowerby, 1825) - (MACTRIDAE)
- aspersa, Daphnella aspersa (A.A. Gould, 1860) - (RAPHITOMIDAE)
- aspersa, Tapes aspersa G.B. II Sowerby, 1852 - syn of: Tapes literatus (C. Linnaeus, 1758) - (VENERIDAE)
- aspersa binuangana, Chrysallis aspersa binuangana P. Bartsch, 1932 - (BRADYBAENIDAE)
- aspersa flavipellis, Chrysallis aspersa flavipellis W.J. Clench & S. Archer, 1933 - (BRADYBAENIDAE)
- aspersa ilogana, Chrysallis aspersa ilogana P. Bartsch, 1932 - (BRADYBAENIDAE)
- aspersa juani, Chrysallis aspersa juani P. Bartsch, 1932 - (BRADYBAENIDAE)
- aspersa lunai, Chrysallis aspersa lunai P. Bartsch, 1932 - (BRADYBAENIDAE)
- aspersa melanogaster, Chrysallis aspersa melanogaster (O.A.L. Mörch, 1852) - (BRADYBAENIDAE)
- aspersa mindoroensis, Chrysallis aspersa mindoroensis (W.J. Broderip, 1841) - (BRADYBAENIDAE)
- aspersa orotis, Chrysallis aspersa orotis W.J. Clench & S. Archer, 1933 - (BRADYBAENIDAE)
- Asperspina, Genus Asperspina L. Rankin, 1979 (ASPERSPINIDAE)
- ASPERSPINIDAE Starobogatov, 1983 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-ACOCHLIDIACEA [Order]-PARHEDYLOIDEA [Superfamily])
- aspersum, Cerithium aspersum G.P. Deshayes, 1863 - syn of: Cerithium zebrum L.C. Kiener, 1841 - (CERITHIIDAE)
- aspersum, Cornu aspersum (O.F. Müller, 1774) - (HELICIDAE)
- aspersum, Helix aspersum O.F. Müller, 1774 - syn of: Cornu aspersum (O.F. Müller, 1774) - (HELICIDAE)
- aspersum, Cryptomphalus aspersum J.R. Bourguignat, 1864 - syn of: Cornu aspersum (O.F. Müller, 1774) - (HELICIDAE)
- aspersum, Cornu aspersum O.F. Müller, 1774 - syn of: Cornu aspersum (O.F. Müller, 1774) - (HELICIDAE)
- aspersum maxima, Cornu aspersum maxima (O.F. Müller, 1774) - (HELICIDAE)
- aspersus, Conus aspersus G.B. I Sowerby, 1833 - syn of: Chelyconus ermineus (I. von Born, 1778) - (CONIDAE)
- aspersus, Discordichilus aspersus (J. Perner, 1903 †) - (ELASMONEMATIDAE) (FOSSIL)
- aspersus, Clithon aspersus (G.B. Sowerby, 1849) - (NERITIDAE)
- aspersus, Pecten aspersus J.B.P.A. Lamarck, 1819 - syn of: Pseudamussium peslutrae (C. Linnaeus, 1771) - (PECTINIDAE)
- aspersus, Leptopecten aspersus G.B. Sowerby, 1835 - syn of: Leptopecten tumbezensis (A.V.M.D. D'Orbigny, 1846) - (PECTINIDAE)
- aspersus, Cultellus aspersus S. Clessin, 1888 - (PHARIDAE)
- aspersus, Solen aspersus R.W. Dunker, 1862 - syn of: Solen vaginoides J.B.P.A. Lamarck, 1822 - (SOLENIDAE)
- aspersus, Hemisinus aspersus L.A. Reeve, 1859 - syn of: Aylacostoma maculatum (I. Lea, 1832) - (THIARIDAE)
- aspersus, Callumbonella aspersus J. Perner, 1903 † - syn of: Discordichilus aspersus (J. Perner, 1903 †) - (TROCHIDAE) (FOSSIL)
- aspersus, Viviparus aspersus A. Michaud, 1837 † - (VIVIPARIDAE) (FOSSIL)
- Aspertilla, syn of: Genus Asperdaphne C. Hedley, 1922 (RAPHITOMIDAE)
- asperula, Bentharca asperula (W.H. Dall, 1881) - (ARCIDAE)
- asperula, Scalptia asperula G.P. Deshayes, 1830 - syn of: Scalptia obliquata (J.B.P.A. Lamarck, 1822) - (CANCELLARIIDAE)
- asperula, Arcturellina asperula (G.P. Deshayes, 1825 †) - (CARDITIDAE) (FOSSIL)
- asperula, Discula asperula L.A. Reeve, 1852 - syn of: Discula polymorpha (R.T. Lowe, 1831) - (HYGROMIIDAE)
- asperula, Cyclopilsbrya asperula (G.B. Sowerby, 1843) - (MEGALOMASTOMIDAE)
- asperula, Rhomboidella asperula S.V. Wood, 1856 - syn of: Rhomboidella prideaux (W.E. Leach, 1815) - (MYTILIDAE)
- asperula, Nassarius asperula (G.B. Brocchi, 1814 †) - (NASSARIIDAE) (FOSSIL)
- asperula, Macrodon asperula W.H. Dall, 1881 - syn of: Bentharca asperula (W.H. Dall, 1881) - (PARALLELODONTIDAE)
- asperula, Pterinea asperula F. McCoy, 1852 † - (PTERINEIDAE) (FOSSIL)
- asperula, Turbonilla asperula K.J. Bush, 1899 - (PYRAMIDELLIDAE)
- asperula, Turritella asperula Brogniart, 1823 † - (TURRITELLIDAE) (FOSSIL)
- asperulata, Acmaea asperulata M. Yokoyama, 1926 † - (ACMAEIDAE) (FOSSIL)
- asperulata, Clavatula asperulata (J.B.P.A. Lamarck, 1822 †) - (CLAVATULIDAE) (FOSSIL)
- asperulata, Neocancilla asperulata A. Adams, 1853 - syn of: Neocancilla hebes (L.A. Reeve, 1845) - (MITRIDAE)
- asperulata, Azumapecten farreri asperulata (A. Adams & L.A. Reeve, 1850) - (PECTINIDAE)
- asperulata, Phenacolepas asperulata (A. Adams, 1858) - (PHENACOLEPADIDAE)
- asperulata, Dunkeria asperulata A. Adams, 1860 - syn of: Cerithidium fuscum (A. Adams, 1860) - (PYRAMIDELLIDAE)
- asperulata, Finella asperulata A. Adams, 1860 - (SCALIOLIDAE)
- asperulata, Stomatella asperulata (A. Adams, 1850) - (TROCHIDAE)
- asperulata ernesti, Clavatula asperulata ernesti F. Toula, 1910 † - (CLAVATULIDAE) (FOSSIL)
- asperulata gracilis, Clavatula asperulata gracilis Erünal-Erentöz, 1958 † - (CLAVATULIDAE) (FOSSIL)
- asperulata pelseneeri, Chlamys asperulata pelseneeri P. Dautzenberg & A.R.J.B. Bavay, 1912 - syn of: Mimachlamys cloacata pelseneeri (P. Dautzenberg & A.R.J.B. Bavay, 1912) - (PECTINIDAE)
- asperulata spinosa, Clavatula asperulata spinosa (J.L.M. Defrance, 1846) - (CLAVATULIDAE)
- asperulata sutura, Clavatula asperulata sutura Andrzejouski † - (CLAVATULIDAE) (FOSSIL)
- asperulatum, Neripteron asperulatum (C.A. Récluz, 1842) - (NERITIDAE)
- asperulatus, Chlamys asperulatus (A. Adams & L.A. Reeve, 1850) - syn of: Azumapecten farreri asperulata (A. Adams & L.A. Reeve, 1850) - (PECTINIDAE)
- asperulum, Vepricardium asperulum (J.B.P.A. Lamarck, 1805 †) - (CARDIIDAE) (FOSSIL)
- asperulum, Cerithium asperulum Moore † - (CERITHIIDAE) (FOSSIL)
- asperulum, Bittium asperulum A.E.M. Cossmann & M.A. Peyrot, 1922 † - syn of: Bittium larrieyense (L. Vignal, 1911 †) - (CERITHIIDAE) (FOSSIL)
- asperulum, Cingulifera cingulatum asperulum (P. Ehrmann, 1910) - (HELICIDAE)
- asperulum, Chondropoma asperulum C.G. Aguayo, 1934 - (POMATIIDAE)
- asperulum, Chondropoma edouardi asperulum C.G. Aguayo, 1934 - (POMATIIDAE)
- asperulum jausi, Chondropoma asperulum jausi C.G. Aguayo, 1934 - (POMATIIDAE)
- asperulus, Toxoceratoides asperulus (A. von Koenen, 1902 †) - (ANCYLOCERATIDAE) (FOSSIL)
- asperulus, Sipho asperulus R. Tate, 1888 † - syn of: Varicosipho asperulus (R. Tate, 1888 †) - (BUCCINIDAE) (FOSSIL)
- asperulus, Fusus asperulus A.E.M. Cossmann, 1883 † - (FASCIOLARIIDAE) (FOSSIL)
- asperulus, Bedeva asperulus (R. Tate, 1888 †) - (MURICIDAE) (FOSSIL)
- asperulus, Varicosipho asperulus (R. Tate, 1888 †) - (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- asperulus, Macrodon asperulus W.H. Dall, 1881 - syn of: Bentharca asperula (W.H. Dall, 1881) - (PARALLELODONTIDAE)
- asperum, Granosolarium asperum (R.B. Hinds, 1844) - (ARCHITECTONICIDAE)
- asperum, Cerion asperum (C.J. Maynard & W.F. Clapp, 1920) - (CERIONIDAE)
- asperum, Lirobittium asperum (W.M. Gabb, 1861 †) - (CERITHIIDAE) (FOSSIL)
- asperum, Cerithium asperum W.H. Pease, 1861 - syn of: Cerithium zonatum (W. Wood, 1828) - (CERITHIIDAE)
- asperum, Cerithium asperum J.G. Bruguière, 1792 - syn of: Rhinoclavis aspera (C. Linnaeus, 1758) - (CERITHIIDAE)
- asperum, Vexillum asperum H. Turner, 2008 - (COSTELLARIIDAE)
- asperum, Striaticostatum asperum N.F. Sohl, 1964 † - (EPITONIIDAE) (FOSSIL)
- asperum, Punctiscala asperum R.B. Watson, 1897 - syn of: Punctiscala cerigottana (R. Sturany, 1896) - (EPITONIIDAE)
- asperum, Parahomoceras asperum Ruzhentsev & Bogoslovskaya, 1971 † - (HOMOCERATIDAE) (FOSSIL)
- asperum lomaense, Lirobittium asperum lomaense P. Bartsch, 1911 - syn of: Lirobittium lomaense (P. Bartsch, 1911) - (CERITHIIDAE)
- asperus, Macromphalus asperus (C. Hedley, 1912) - (VANIKORIDAE)
- asphala, Bathymophila asphala B.A. Marshall, 1999 - (SOLARIELLIDAE)
- asphales, Calliotropis asphales C. Vilvens, 2007 - (CALLIOTROPIDAE)
- asphaltica, Myrtea asphaltica Cooke, 1919 † - (LUCINIDAE) (FOSSIL)
- asphaltina, Cerithium vulgatum asphaltina T.A. de M. Monterosato, 1910 - (CERITHIIDAE)
- asphaltina, Pyrostoma asphaltina (E.A. Rossmässler, 1836) - (CLAUSILIIDAE)
- asphaltoda, Columbella asphaltoda C.J. Maury, 1912 † - (COLUMBELLIDAE) (FOSSIL)
- asphaltodes, Gracilispira asphaltodes (C. Beets, 1942 †) - (ANCILLARIIDAE) (FOSSIL)
- asphaltodes, Leptoconus asphaltodes Beets, 1953 † - (CONIDAE) (FOSSIL)
- asphaltodus, Alvania asphaltodus C. Beets, 1942 † - (RISSOIDAE) (FOSSIL)
- Asphinctites, Genus Asphinctites Buckman, 1924 (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- aspicienda, Dizoniopsis aspicienda P. Bouchet, S. Gofas & A. Warén, 2010 - (CERITHIOPSIDAE)
- aspicienda, Amaea aspicienda (J.C. Melvill, 1912) - (EPITONIIDAE)
- aspicienda, Epitonium aspicienda J.C. Melvill, 1912 - syn of: Amaea aspicienda (J.C. Melvill, 1912) - (EPITONIIDAE)
- aspidaulax, Ischnochiton aspidaulax H.A. Pilsbry, 1896 - (ISCHNOCHITONIDAE)
- Aspidelus, syn of: Genus Rhopalogonium E. Degner, 1932 (UROCYCLIDAE)
- aspidensis, Ambigua fuscolabiata aspidensis (Tagliani, 1942) - (HELICIDAE)
- Aspidites, syn of: Genus Clypeoceras Smith , 1913 (CLYPEOCERATIDAE) (FOSSIL)
- Aspidoceras, Genus Aspidoceras Zittel (ASPIDOCERATIDAE) (FOSSIL)
- ASPIDOCERATIDAE Zittel, 1895 - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-PERISPHINCTOIDEA [Superfamily]) (FOSSIL)
- aspidoides, Oxycerites aspidoides (Oppel, 1857 †) - (OPPELIIDAE) (FOSSIL)
- Aspidopholas, Genus Aspidopholas P. Fischer, 1887 (PHOLADIDAE)
- Aspidoporus, syn of: Genus Tandonia R.P. Lesson & C. Pollonera, 1882 (MILACIDAE)
- Aspidostephanus, Genus Aspidostephanus Spath, 1925 (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- aspidostomus, Arcestes aspidostomus Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- Aspidotheca, Genus Aspidotheca Dahmer, 1936 (PTEROTHECIDAE) (FOSSIL)
- Aspidotomium, Genus Aspidotomium E. Degner, 1932 (UROCYCLIDAE)
- aspii, Physa aspii E.L. Holmberg, 1909 - (PHYSIDAE)
- aspila, Cernuella aspila J.R. Bourguignat, 1887 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- Aspilaturbo, syn of: Genus Turbo C. Linnaeus, 1758 (TURBINIDAE)
- aspilosomatis, Callistoctopus aspilosomatis (M.D. Norman, 1993) - (OCTOPODIDAE)
- aspina, Diacavolinia aspina S. Van Der Spoel, P. Bleeker & H. Kobayasi, 1993 - (CAVOLINIIDAE)
- Aspinoceras, Genus Aspinoceras Anderson, 1938 (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- aspinosa, Volvula aspinosa W.H. Dall, 1889 - syn of: Volvulella paupercula (R.B. Watson, 1883) - (ACTEOCINIDAE)
- aspinosa, Pilorcula aspinosa B. Hausdorf, 1996 - (ORCULIDAE)
- aspinosum, Busycon aspinosum S.C. Hollister, 1958 - syn of: Busycon sinistrum S.C. Hollister, 1958 - (BUSYCONIDAE)
- aspinosus, Stoyanowites aspinosus W. Korn & Ghaderi, 2015 † - (DZHULFITIDAE) (FOSSIL)
- aspinosus, Urosalpinx aspinosus (Meyer, 1886 †) - (MURICIDAE) (FOSSIL)
- aspinwallensis, Edmondia aspinwallensis F.B. Meek, 1871 † - (EDMONDIIDAE) (FOSSIL)
- aspirans, Kaliella aspirans (W.T. Blanford) - (CHRONIDAE)
- aspirans, Poleumita aspirans J. Perner, 1903 † - syn of: Oriostoma aspirans (J. Perner, 1903 †) - (EUOMPHALIDAE) (FOSSIL)
- aspirans, Oriostoma aspirans (J. Perner, 1903 †) - (ORIOSTOMATIDAE) (FOSSIL)
- aspirans, Tenka aspirans Barrande, 1881 † - (STOLIDOTIDAE) (FOSSIL)
- aspirans, Stenomelania aspirans (R.B. Hinds, 1844) - (THIARIDAE)
- aspis, Clymenia aspis Nikolaeva & Ivanovich, 2005 † - (CLYMENIIDAE) (FOSSIL)
- aspratile, Chondropoma aspratile P.M.A. Morelet, 1873 - (POMATIIDAE)
- asprella, Merica asprella unknown - syn of: Merica sinensis L.A. Reeve, 1856 - (CANCELLARIIDAE)
- Asprella, Genus Asprella L.W. Schaufuss, 1869 (CONIDAE)
- aspris, Califadesma aspris L.R. Saul, 1989 † - (MESODESMATIDAE) (FOSSIL)
- aspris, Pyktes aspris W.P. Popenoe, 1983 † - (PUGNELLIDAE) (FOSSIL)
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