- Amsleroceras, Genus Amsleroceras Hook & Flower, 1977 † (BALTOCERATIDAE) (FOSSIL)
- amsterdamensis, Leptochiton amsterdamensis P. Kaas & R.A. Van Belle, 1990 - (LEPTOCHITONIDAE)
- amudariense, Watinoceras amudariense (Arkhanguelsky, 1916 †) - (ACANTHOCERATIDAE) (FOSSIL)
- amuletum, Tornoceras amuletum House, 1965 † - (TORNOCERATIDAE) (FOSSIL)
- Amuletum, Genus Amuletum Stephenson , 1941 † (TURRIDAE) (FOSSIL)
- amundensis, Prodichotomites amundensis Kemper & Jeletzky, 1979 † - (POLYPTYCHITIDAE) (FOSSIL)
- Amundiptychites, Subgenus Polyptychites (Amundiptychites) Jeletzky & Kemper, 1988 † (POLYPTYCHITIDAE) (FOSSIL)
- amundseni, Mathilda amundseni Marincovich Jr., 1993 † - (MATHILDIDAE) (FOSSIL)
- amundseni, Sverdrupites amundseni Nassichuk, 1970 † - (SPIROLEGOCERATIDAE) (FOSSIL)
- amundseni, Alcithoe amundseni J.D. Stilwell & Zinsmeister, 1992 † - (VOLUTIDAE) (FOSSIL)
- Amuranodonta, Genus Amuranodonta Moskvicheva, 1973 (UNIONIDAE)
- Amuraplexa, Genus Amuraplexa Y.I. Starobogatov, L.A. Prozorova & F. Zatrawkin, 1989 (PHYSIDAE)
- Amurbuldowskia, syn of: Genus Buldowskia Moskvicheva, 1973 (UNIONIDAE)
- amurense, Musculium amurense F. Zatrawkin & I.M. Moskvicheva, 1986 - syn of: Musculium lacustre (O.F. Müller, 1774) - (SPHAERIIDAE)
- amurensis, Potamocorbula amurensis (Shrenck 1867) † - (CORBULIDAE) (FOSSIL)
- amurensis, Potamocorbula amurensis (L. von Schrenck, 1861) - (CORBULIDAE)
- amurensis, Corbicula amurensis V.V. Bogatov & Y.I. Starobogatov, 1994 - (CYRENIDAE)
- amurensis, Cylindropalaina amurensis (A. Mousson, 1887) - (DIPLOMMATINIDAE)
- amurensis, Erodona amurensis L. von Schrenck, 1862 - (ERODONIDAE)
- amurensis, Helix amurensis G. Gerstfeldt, 1859 - syn of: Zoogenetes harpa (T. Say, 1824) - (HELICIDAE)
- amurensis, Lymnaea amurensis N.D. Kruglov & Y.I. Starobogatov, 1984 - (LYMNAEIDAE)
- amurensis, Amuraplexa amurensis (Y.I. Starobogatov & L.A. Prozorova, 1989) - (PHYSIDAE)
- amurensis, Ectinochilus amurensis Abbass, 1967 † - (RIMELLIDAE) (FOSSIL)
- amurensis, Parajuga amurensis (G. Gerstfeldt, 1859) - (SEMISULCOSPIRIDAE)
- amurensis, Melania amurensis G. Gerstfeldt, 1859 - syn of: Parajuga amurensis (G. Gerstfeldt, 1859) - (THIARIDAE)
- amurensis, Anodonta amurensis I.M. Moskvicheva, 1973 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- amurensis, Cincinna amurensis I.M. Moskvicheva, 1985 - (VALVATIDAE)
- amurensis laevigata, Melania amurensis laevigata G. Gerstfeldt, 1859 - syn of: Parajuga nodosa (C.A. Westerlund, 1897) - (THIARIDAE)
- amurensis takatuayamaensis, Potamocorbula amurensis takatuayamaensis Y. Ando, 1965 - syn of: Potamocorbula amurensis (L. von Schrenck, 1861) - (CORBULIDAE)
- amurensis takatukayamaensis, Potamocorbula amurensis takatukayamaensis Y. Ando, 1965 - (CORBULIDAE)
- amurensls, Pleuronautilus amurensls Kiparisova, 1961 † - (TAINOCERATIDAE) (FOSSIL)
- Amureuglesa, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- Amuriana, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- amuricus, Anisus amuricus L.A. Prozorova & Y.I. Starobogatov, 1998 - (PLANORBIDAE)
- amuriensis, Mixtipecten amuriensis (Woods) † - (PTERIIDA (UNASSIGNED)) (FOSSIL)
- Amurohenslowiana, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- Amuropaludina, Genus Amuropaludina I.M. Moskvicheva, 1979 (VIVIPARIDAE)
- Amuropecten, Genus Amuropecten Sey, 1984 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- Amuropisidium, syn of: Genus Pisidium L. Pfeiffer, 1821 (SPHAERIIDAE)
- amusiiformis, Indopecten amusiiformis Hudson & Jefferies, 1961 † - (PECTINIDAE) (FOSSIL)
- Amusium, Genus Amusium P.F. Röding, 1798 (PECTINIDAE)
- amusoides, Euvola amusoides (O. Macsotay & B. Campos, 2001) - (PECTINIDAE)
- amusoides, Pecten amusoides O. Macsotay & B. Campos, 2001 - syn of: Euvola amusoides (O. Macsotay & B. Campos, 2001) - (PECTINIDAE)
- Amussiopecten, Genus Amussiopecten Sacco , 1897 † (PECTINIDAE) (FOSSIL)
- amussitata, Sitala amussitata E.A. Smith, 1895 - syn of: Kaliella amussitata (E.A. Smith, 1895) - (ARIOPHANTIDAE)
- amussitata, Kaliella amussitata (E.A. Smith, 1895) - (CHRONIDAE)
- amussitata, Cellana toreuma amussitata (L.A. Reeve, 1855) - (NACELLIDAE)
- amussitata, Patella amussitata L.A. Reeve, 1855 - syn of: Cellana toreuma amussitata (L.A. Reeve, 1855) - (PATELLIDAE)
- amussitatum, Homalopoma amussitatum (A.A. Gould, 1861) - (COLLONIIDAE)
- amussitatus, Turbo amussitatus A.A. Gould, 1861 - syn of: Homalopoma amussitatum (A.A. Gould, 1861) - (TURBINIDAE)
- Amussium, syn of: Genus Amusium P.F. Röding, 1798 (PECTINIDAE)
- Amycla, syn of: Genus Nassarius Duméril, 1805 (NASSARIIDAE)
- amycliformis, Nassarius amycliformis (T. Shuto, 1969 †) - (NASSARIIDAE) (FOSSIL)
- Amyclina, Genus Amyclina Iredale, 1918 † (NASSARIIDAE) (FOSSIL)
- Amyclina, syn of: Genus Nassarius Duméril, 1805 (NASSARIIDAE)
- Amycula, syn of: Genus Amicula J.E. Gray, 1847 (MOPALIIDAE)
- amycus, Leucosyrinx amycus W.H. Dall, 1919 - (PSEUDOMELATOMIDAE)
- amycus, Antiplanes amycus W.H. Dall, 1919 - syn of: Leucosyrinx kantori J.H. McLean, 1995 - (PSEUDOMELATOMIDAE)
- amyda, Emarginula amyda T. Shikama, 1962 - (FISSURELLIDAE)
- amydra, Anatoma amydra D.L. Geiger & B.A. Marshall, 2012 - (ANATOMIDAE)
- amydralox, Pseudosetia amydralox P. Bouchet & A. Warén, 1993 - (RISSOIDAE)
- amydroglyptum, Caecum amydroglyptum H.A. Rehder, 1980 - (CAECIDAE)
- amydrozona, Balanetta amydrozona (J.C. Melvill, 1906) - (MARGINELLIDAE)
- amydrozona, Volvarina amydrozona J.C. Melvill, 1906 - syn of: Balanetta amydrozona (J.C. Melvill, 1906) - (MARGINELLIDAE)
- amyela, Glyptaesopus amyela W.H. Dall, 1919 - syn of: Glyptaesopus phylira (W.H. Dall, 1919) - (BORSONIIDAE)
- amygdala, Bulla amygdala L.W. Dillwyn, 1817 ex D.C. Solander MS - syn of: Bulla striata J.G. Bruguière, 1792 - (BULLIDAE)
- amygdala, Cardinia amygdala A.E.R. Agassiz, 1843 † - syn of: Cardinia hybrida (Sowerby, 1817 †) - (CARDINIIDAE) (FOSSIL)
- amygdala, Conocardium amygdala Barrande, 1881 † - (CONOCARDIIDAE) (FOSSIL)
- amygdala, Atys amygdala A. Adams in G.B. II Sowerby, 1850 - syn of: Bulla amygdalus A. Adams in G.B. II Sowerby, 1850 - (HAMINOEIDAE)
- amygdala, Tribelopoma amygdala Jacquet, Jago & P. Brock, 2016 † - (HELCIONELLOIDEA (UNASSIGNED)) (FOSSIL)
- amygdala, Mactra amygdala J.C.H. Crosse & P.H. Fischer, 1864 - syn of: Anapella cycladea (J.B.P.A. Lamarck, 1818) - (MACTRIDAE)
- amygdala, Ovocerina amygdala (Barrande, 1865 †) - (MANDALOCERATIDAE) (FOSSIL)
- amygdala, Cardiella amygdala Leonova, 1981 † - (MARATHONITIDAE) (FOSSIL)
- amygdala, Marginella amygdala L.C. Kiener, 1841 - syn of: Prunum amygdalum (L.C. Kiener, 1841) - (MARGINELLIDAE)
- amygdala, Anapella amygdala (E.C. Von Martens, 1860) - (MESODESMATIDAE)
- amygdala, Anapella amygdala J.C.H. Crosse & P.H. Fischer, 1864 - syn of: Anapella cycladea (J.B.P.A. Lamarck, 1818) - (MESODESMATIDAE)
- amygdala, Cronia amygdala (L.C. Kiener, 1835) - (MURICIDAE)
- amygdala, Purpura amygdala L.C. Kiener, 1835 - syn of: Cronia amygdala (L.C. Kiener, 1835) - (MURICIDAE)
- amygdala, Villosa amygdala (I. Lea, 1843) - (UNIONIDAE)
- amygdala, Tapes amygdala A. Römer, 1864 - syn of: Polititapes aureus (J.F. Gmelin, 1791) - (VENERIDAE)
- Amygdala, syn of: Genus Tapes J.K. Megerle Von Mühlfeld, 1811 (VENERIDAE)
- amygdalaeformis, Diplodon amygdalaeformis Wesselingh, 2006 † - (HYRIIDAE) (FOSSIL)
- amygdalea, Nucula amygdalea A. Valenciennes, 1846 - syn of: Yoldia hyperborea (A.A. Gould, 1841) - (NUCULIDAE)
- amygdalea, Yoldia amygdalea A. Valenciennes, 1846 - (YOLDIIDAE)
- amygdalea, Yoldia amygdalea T. Habe, 1964 - syn of: Yoldia bartschi O.A. Scarlato, 1981 - (YOLDIIDAE)
- amygdaliformis, Claraia amygdaliformis Zhang, 1980 † - (PTERINOPECTINIDAE) (FOSSIL)
- amygdalina, Ambonychinia amygdalina (J.W. Hall, 1847 †) - (AMBONYCHIIDAE) (FOSSIL)
- amygdalina, Lyncina amygdalina (G.P. Deshayes, 1835 †) - (CYPRAEIDAE) (FOSSIL)
- amygdalina, Polymesoda amygdalina G.P. Deshayes, 1857 † - (CYRENIDAE) (FOSSIL)
- amygdalina, Fuchsella amygdalina (Sowerby, 1827 †) - (GRAMMYSIIDAE) (FOSSIL)
- amygdalina, Tanodon amygdalina T.W. Kirk, 1927 † - syn of: Tanaodon louderbacki (T.W. Kirk, 1927 †) - (LYRODESMATIDAE) (FOSSIL)
- amygdalina, Neoactinodonta amygdalina T.W. Kirk, 1927 † - syn of: Tanaodon louderbacki (T.W. Kirk, 1927 †) - (LYRODESMATIDAE) (FOSSIL)
- amygdalina, Orthonota amygdalina T.A. Conrad 1841 † - (ORTHONOTIDAE) (FOSSIL)
- amygdalina, Petricola amygdalina G.B. I Sowerby, 1834 - (VENERIDAE)
- amygdalina globulosa, Orthonota amygdalina globulosa (McCoy †) - (ORTHONOTIDAE) (FOSSIL)
- amygdalinum, Eurydesma amygdalinum Reed, 1936 † - (EURYDESMATIDAE) (FOSSIL)
- amygdaloides, Barbatia amygdaloides G.P. Deshayes, 1858 † - (ARCIDAE) (FOSSIL)
- amygdaloides, Astarte amygdaloides Lundgren, 1895 - (ASTARTIDAE)
- amygdaloides, Mytiloides amygdaloides G.A. Goldfuss, 1835 † - (INOCERAMIDAE) (FOSSIL)
- Amygdalonaias, syn of: Genus Truncilla C.S. Rafinesque, 1819 (UNIONIDAE)
- amygdalum, Arca amygdalum Demir, 1977 - syn of: Anadara transversa (T. Say, 1822) - (ARCIDAE)
- amygdalum, Arca amygdalum J.H.F. Link, 1807 - syn of: Barbatia amygdalumtostum (P.F. Röding, 1798) - (ARCIDAE)
- amygdalum, Anadara amygdalum R.A. Philippi, 1845 - syn of: Anadara kagoshimensis (S. Tokunaga, 1906) - (ARCIDAE)
- amygdalum, Zonarina amygdalum (G.B. Brocchi 1814 †) - (CYPRAEIDAE) (FOSSIL)
- amygdalum, Gomphoceras amygdalum Barrande, 1865 † - syn of: Ovocerina amygdala (Barrande, 1865 †) - (DIESTOCERATIDAE) (FOSSIL)
- amygdalum, Prunum amygdalum (L.C. Kiener, 1841) - (MARGINELLIDAE)
- Amygdalum, Genus Amygdalum J.K. Megerle Von Mühlfeld, 1811 (MYTILIDAE)
- amygdalumtostum, Barbatia amygdalumtostum (P.F. Röding, 1798) - (ARCIDAE)
- amygdalumtostum, Arca amygdalumtostum P.F. Röding, 1798 - syn of: Barbatia amygdalumtostum (P.F. Röding, 1798) - (ARCIDAE)
- amygdalus, Palaearca amygdalus Salter, 1866 † - (BIVALVIA INCERTAE SEDIS) (FOSSIL)
- amygdalus, Bulla amygdalus A. Adams in G.B. II Sowerby, 1850 - (BULLIDAE)
- amymone, Hemipleurotoma amymone W.H. Dall, 1918 - (TURRIDAE)
- amyra, Doto amyra Er. Marcus, 1961 - (DOTIDAE)
- Amyssodropa, Genus Amyssodropa MacNeil, 1984 † (NEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Amyxa, syn of: Genus Prisogaster O.A.L. Mörch, 1850 (TURBINIDAE)
- anaaensis, Allochroa anaaensis A. Mousson, 1869 - syn of: Allochroa layardi (H. Adams & A. Adams, 1855) - (ELLOBIIDAE)
- anaaensis, Helicina anaaensis A. Mousson, 1869 - (HELICINIDAE)
- anabaptizata, Alvania anabaptizata Boettger, 1906 † - (RISSOIDAE) (FOSSIL)
- Anabarella, Genus Anabarella Vostokova, 1962 † (STENOTHECIDAE) (FOSSIL)
- anabarica, Poleumita anabarica Kurushin, 1986 † - (EUOMPHALIDAE) (FOSSIL)
- anabarica, Panopea anabarica Kurushin, 1992 † - (HIATELLIDAE) (FOSSIL)
- anabarica, Mackinnonia anabarica Parkhaev, 2005 † - (TRENELLIDAE) (FOSSIL)
- Anabaroconus, Genus Anabaroconus Gubanov & al., 2004 † (HELCIONELLIDAE) (FOSSIL)
- anabarus, Galicornus anabarus Valkov, 1975 † - (GALICORNIDAE) (FOSSIL)
- anabathmis, Odostomia anabathmis J.C. Melvill, 1910 - (PYRAMIDELLIDAE)
- anabathmos, Epitonium anabathmos R.N. Kilburn, 1985 - (EPITONIIDAE)
- ANABATHRIDAE Keen, 1971 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-LITTORINIMORPHA [Order]-TRUNCATELLOIDEA [Superfamily])
- Anabathron, Genus Anabathron G.R. von Frauenfeld, 1867 (ANABATHRIDAE)
- anabathron, Murchisonella anabathron (C. Hedley, 1906) - (MURCHISONELLIDAE)
- anabathrum, Gradiconus anabathrum (J.C.H. Crosse, 1865) - (CONIDAE)
- anabathrum antoni, Conus anabathrum antoni W.P. Cargile, 2011 - syn of: Gradiconus burryae (W.J. Clench, 1942) - (CONIDAE)
- anabathrum aureonimbosus, Gradiconus anabathrum aureonimbosus E.J. Petuch, 1987 - syn of: Attenuiconus aureonimbosus (E.J. Petuch, 1987) - (CONIDAE)
- anabathrum burryae, Gradiconus anabathrum burryae W.J. Clench, 1942 - syn of: Gradiconus burryae (W.J. Clench, 1942) - (CONIDAE)
- anabathrum patglicksteinae, Conus anabathrum patglicksteinae E.J. Petuch, 1987 - syn of: Gradiconus patglicksteinae (E.J. Petuch, 1987) - (CONIDAE)
- anabathrum tranthami, Gradiconus anabathrum tranthami E.J. Petuch, 1998 - syn of: Gradiconus burryae (W.J. Clench, 1942) - (CONIDAE)
- anabelae, Varioconus anabelae (E. Rolán & D. Röckel, 2001) - (CONIDAE)
- anabelae, Pusia anabelae C. Fernández, 1992 - syn of: Vexillum zebrinum (A.V.M.D. D'Orbigny, 1840) - (COSTELLARIIDAE)
- Anabeloceras, syn of: Genus Naplesites Yatskov , 1990 † (BELOCERATIDAE) (FOSSIL)
- Anabrahmaites, Subgenus Brahmaites (Anabrahmaites) Forbes, 1846 † (KOSSMATICERATIDAE) (FOSSIL)
- anacanthos, Bolma anacanthos Beu & Ponder, 1979 † - (TURBINIDAE) (FOSSIL)
- anacanthus, Leiodistichites anacanthus (Diener, 1923 †) - (DISTICHITIDAE) (FOSSIL)
- anacanthus, Spondylus anacanthus J. Mawe, 1823 - (SPONDYLIDAE)
- anacanthus flabellum, Spondylus anacanthus flabellum L.A. Reeve, 1856 - syn of: Spondylus flabellum L.A. Reeve, 1856 - (SPONDYLIDAE)
- anacanthus nudus, Spondylus anacanthus nudus (L.A. Reeve, 1842) - (SPONDYLIDAE)
- anacanthus pacificus, Spondylus anacanthus pacificus (T. Iredale, 1939) - (SPONDYLIDAE)
- anacanthus pacificus fortior, Spondylus anacanthus pacificus fortior T. Iredale, 1939 - (SPONDYLIDAE)
- anacaprica, Helix anacaprica R. Bellini, 1915 - syn of: Ambigua fuscolabiata (E.A. Rossmässler, 1842) - (HELICIDAE)
- anacardium, Phoenicobius anacardium (W.L.H. Dohrn, 1878) - (BRADYBAENIDAE)
- anacarina, Turbinilopsis anacarina Tyler, 1965 † - (ANOMPHALIDAE) (FOSSIL)
- Anachis, Genus Anachis H. Adams & A. Adams, 1953 (COLUMBELLIDAE)
- anachisoides, Mitrella anachisoides S. Nomura & H. Niino, 1940 - (COLUMBELLIDAE)
- anachorea, Melanella anachorea W.H. Dall, 1927 - (EULIMIDAE)
- anachoreta, Peronaeus anachoreta L. Pfeiffer, 1856 - (BULIMULIDAE)
- anachoreta, Helminthoglypta nickliniana anachoreta (W.G. Binney, 1897) - (HELMINTHOGLYPTIDAE)
- anachoreta, Petricola anachoreta L. de Folin, 1867 - syn of: Choristodon robustus (G.B. I Sowerby, 1834) - (VENERIDAE)
- anachoretica, Fruticicola helvola anachoretica (P.V. Matiokin, 1966) - (BRADYBAENIDAE)
- Anacithara, Genus Anacithara C. Hedley, 1922 (HORAICLAVIDAE)
- Anacitharoida, syn of: Genus Anacithara C. Hedley, 1922 (HORAICLAVIDAE)
- anaclasta, Coelostemma anaclasta F.G. Thompson, 1971 - (UROCOPTIDAE)
- Anacleoniceras, Genus Anacleoniceras Mirzoyev, 1969 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- anaclima, Bathyarca anaclima (J.C. Melvill & R. Standen, 1907) - (ARCIDAE)
- anacona, Orthosurcula anacona (G.F. Harris, 1895 †) - (COCHLESPIRIDAE) (FOSSIL)
- anacona, Pleurotoma anacona G.F. Harris, 1895 † - syn of: Orthosurcula anacona (G.F. Harris, 1895 †) - (TURRIDAE) (FOSSIL)
- anacra, Pyrgulina anacra E. Saurin, 1959 - (PYRAMIDELLIDAE)
- anacteola, Columbella anacteola P.L. Duclos, 1835 - syn of: Anachis fasciata (G.B. I Sowerby, 1825) - (COLUMBELLIDAE)
- anactor, Turritella anactor S.S. Berry, 1957 - (TURRITELLIDAE)
- Anadara, Genus Anadara J.E. Gray, 1847 (ARCIDAE)
- anadaraeformis, Cardita anadaraeformis A.E.M. Cossmann & G. Pissarro † - (CARDITIDAE) (FOSSIL)
- Anadarca, syn of: Genus Anadara J.E. Gray, 1847 (ARCIDAE)
- Anadaria, syn of: Genus Anadara J.E. Gray, 1847 (ARCIDAE)
- anadelgado, Agladrillia anadelgado E. Rolán, P. Ryall & J. Horro, 2007 - (DRILLIIDAE)
- Anadema, Genus Anadema H. Adams & A. Adams, 1854 (COLLONIIDAE)
- anadema, Conus anadema J.R. le B. Tomlin, 1937 - syn of: Strategoconus splendidulus (G.B. I Sowerby, 1833) - (CONIDAE)
- Anademaria, syn of: Genus Asperspina L. Rankin, 1979 (ASPERSPINIDAE)
- ANADENIDAE Pilsbry, 1948 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-ARIONOIDEA [Superfamily])
- Anadeninus, syn of: Genus Anadenus D.F. Heynemann, 1863 (ANADENIDAE)
- Anadenulus, Genus Anadenulus T.D.A. Cockerell, 1890 (ANADENIDAE)
- Anadenus, Genus Anadenus D.F. Heynemann, 1863 (ANADENIDAE)
- Anadesmoceras, Genus Anadesmoceras Casey , 1954 † (HOPLITIDAE) (FOSSIL)
- anadoni, Babakina anadoni (J.A. Ortea, 1979) - (FLABELLINIDAE)
- Anadontella, Genus Anadontella Betekhtina, 1987 † (ANADONTELLIDAE) (FOSSIL)
- ANADONTELLIDAE Silantiev, 2011 † - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-MYALINIDA [Order]-PROKOPIEVSKIOIDEA [Superfamily]) (FOSSIL)
- Anadontina, syn of: Genus Alasmidonta T. Say, 1818 (UNIONIDAE)
- ANADROMIDAE Wenz, 1940 † - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-CLAUSILIOIDEA [Superfamily]) (FOSSIL)
- Anadura, syn of: Genus Anadara J.E. Gray, 1847 (ARCIDAE)
- anadyrensis, Strophocardia anadyrensis A.M. Popov, 1983 † - (CARDITIDAE) (FOSSIL)
- anae, Alarimella anae Saul, 1998 † - (APORRHAIDAE) (FOSSIL)
- anae, Glycymerita anae Smith, 1945 † - (GLYCYMERIDIDAE) (FOSSIL)
- anae, Polycera anae M. Pola, M. Sánchez-Benítez & B. Ramiro, 2014 - (POLYCERIDAE)
- anae, Turbonilla anae A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- Anaegires, syn of: Genus Aegires S.L. Lovén, 1844 (AEGIRIDAE)
- Anafecoptis, Subgenus Tetrentodon (Anafecoptis) M.L. Jaume & C. de la Torre, 1972 (UROCOPTIDAE)
- anafense, Farcimen gundlachi anafense C. de la Torre, P. Bartsch & J.P.E. Morrison, 1942 - (MEGALOMASTOMIDAE)
- anafense, Rhytidopoma nodulatum anafense C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- anafense, Chondropoma pictum anafense C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- anafensis, Chondrothyrella petricosa anafensis C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- anafensis, Microceramus anafensis J. Henderson, 1916 - (UROCOPTIDAE)
- anafensis, Torrecoptis anafensis (J. Henderson, 1916) - (UROCOPTIDAE)
- Anaflemingites, Genus Anaflemingites Kummel & Steele, 1962 † (FLEMINGITIDAE) (FOSSIL)
- Anafossarus, Subgenus Fossarus (Anafossarus) T. Iredale, 1936 (PLANAXIDAE)
- anaga, Napaeus anaga J.P.A. Grasset, 1857 ? - syn of: Napaeinus tabidus (R.J. Shuttleworth, 1852) - (ENIDAE)
- anagaensis, Canaridiscus anagaensis C.M. Ibáñez & G.A. Holyoak, 2011 - (DISCIDAE)
- Anagasta, syn of: Genus Anagastina P. Radoman, 1978 (HYDROBIIDAE)
- anagastica, Radomaniola curta anagastica (P. Radoman, 1973) - (HYDROBIIDAE)
- Anagastina, Genus Anagastina P. Radoman, 1978 (HYDROBIIDAE)
- Anagastroplites, Genus Anagastroplites Jeletzky , 1980 † (HOPLITIDAE) (FOSSIL)
- Anagaudryceras, Genus Anagaudryceras Shimizu, 1934 † (GAUDRYCERATIDAE) (FOSSIL)
- Anaglyphula, Genus Anaglyphula B. Rensch, 1932 (ASSIMINEIDAE)
- anaglypta, Amastra sericea anaglypta C.M. Cooke, 1917 - (AMASTRIDAE)
- anaglypta, Tropidoturris anaglypta R.N. Kilburn, 1986 - (BORSONIIDAE)
- anaglypta, Pukeuria anaglypta C.R. Laws, 1941 † - (PYRAMIDELLIDAE) (FOSSIL)
- anaglyptica, Conasprella anaglyptica (J.C.H. Crosse, 1865) - (CONIDAE)
- anaglyptica, Jaspidiconus anaglyptica (J.C.H. Crosse, 1865) - syn of: Conasprella anaglyptica (J.C.H. Crosse, 1865) - (CONIDAE)
- anaglyptica, Plebecula anaglyptica L.A. Reeve - syn of: Actinella nitidiuscula (G.B. I Sowerby, 1824) - (HYGROMIIDAE)
- anaglyptus, Astronacus anaglyptus W.P. Woodring, 1959 † - (ARCHITECTONICIDAE) (FOSSIL)
- anaglyptus, Gymnoplax anaglyptus A. de Rochebrune, 1884 - syn of: Chaetopleura lurida (G.B. I Sowerby in W.J. Broderip & G.B. I Sowerby, 1832) - (CHITONIDAE)
- Anagymnites, Genus Anagymnites Smith, 1914 † (PROTEUSITIDAE) (FOSSIL)
- Anagymnotoceras, Genus Anagymnotoceras McLearn , 1946 † (BEYRICHITIDAE) (FOSSIL)
- Anahamulina, Genus Anahamulina Hyatt, 1900 † (ANAHAMULINIDAE) (FOSSIL)
- ANAHAMULINIDAE Breistroffer, 1952 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-TURRILITINA [Order]-HAMULINOIDEA [Superfamily]) (FOSSIL)
- Anahoplites, Genus Anahoplites Mantell, 1822 † (HOPLITIDAE) (FOSSIL)
- anahuacensis, Protancyloceras anahuacensis Cantu-Chapa, 1962 † - (PROTANCYLOCERATIDAE) (FOSSIL)
- anaiis, Strigatella anaiis R.P. Lesson, 1842 - syn of: Mitra litterata J.B.P.A. Lamarck, 1811 - (MITRIDAE)
- anaimus, Horaiclavus anaimus A.V. Sysoev in A.E. Fedosov & Y.I. Kantor, 2008 - (HORAICLAVIDAE)
- anaiteus, Hexabranchus anaiteus L.S.R. Bergh, 1878 - syn of: Hexabranchus sanguineus (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (HEXABRANCHIDAE)
- anaitis, Cerithiopsis anaitis P. Bartsch, 1918 - (CERITHIOPSIDAE)
- anaitis, Leptopoma nitidum anaitis P. Bartsch, 1918 - (CYCLOPHORIDAE)
- Anaitis, syn of: Genus Clausinella J.E. Gray, 1851 (VENERIDAE)
- anakasakasensis, Sitala anakasakasensis E. Fischer-Piette, Ch.P. Blanc & D. Vukadinovic, 1974 - syn of: Sitala ankasakasensis E. Fischer-Piette, Ch.P. Blanc & D. Vukadinovic, 1974 - (ARIOPHANTIDAE)
- Anakashmirites, syn of: Genus Kashmirites Mathews, 1929 † (PRIONITIDAE) (FOSSIL)
- anakena, Nuculana anakena B.K. Raines & M. Huber, 2012 - (NUCULANIDAE)
- anakisia, Engina anakisia (P.L. Duclos, 1850) - (BUCCINIDAE)
- anakisia, Columbella anakisia P.L. Duclos, 1850 - syn of: Engina anakisia (P.L. Duclos, 1850) - (COLUMBELLIDAE)
- anaklastum, Parallelodon anaklastum Winters, 1963 † - (PARALLELODONTIDAE) (FOSSIL)
- Anaklinoceras, Genus Anaklinoceras Stephenson , 1941 † (NOSTOCERATIDAE) (FOSSIL)
- analamerae, Ampelita analamerae K.C. Emberton, 1999 - syn of: Edentulina analamerae (K.C. Emberton, 1999) - (ACAVIDAE)
- analamerae, Kalidos analamerae K.C. Emberton, 2007 - (ARIOPHANTIDAE)
- analamerae, Owensgriffithsius analamerae K.C. Emberton, 2002 - (CYCLOPHORIDAE)
- analamerae, Edentulina analamerae (K.C. Emberton, 1999) - (STREPTAXIDAE)
- analampulla, Doris analampulla F.D. Abraham, 1877 - (DORIDIDAE)
- Analcadia, Subgenus Alcadia (Analcadia) A. Wagner, 1907 (HELICINIDAE)
- analis, Cardita analis R.A. Philippi, 1836 - (CARDITIDAE)
- analis, Nuculana analis R.A. Philippi, 1851 - syn of: Nuculana mauritiana (G.B. I Sowerby, 1833) - (NUCULANIDAE)
- analis, Nucula analis R.A. Philippi, 1851 - syn of: Nuculana mauritiana (G.B. I Sowerby, 1833) - (NUCULIDAE)
- analis, Polygyra analis W.M. Gabb, 1865 - syn of: Linisia anilis (W.M. Gabb, 1865) - (POLYGYRIDAE)
- analoga, Puncturella analoga E.C. Von Martens, 1903 - syn of: Puncturella conica (A.V.M.D. D'Orbigny, 1841) - (FISSURELLIDAE)
- analoga, Limatula analoga A. Watelet, 1868 † - (LIMIDAE) (FOSSIL)
- analoga, Purpura analoga E. Forbes, 1852 - syn of: Nucella canaliculata (P.L. Duclos, 1832) - (MURICIDAE)
- analoga, Tiberia analoga J.J. Van Aartsen & J.X. Corgan, 1996 - (PYRAMIDELLIDAE)
- analoga, Onoba analoga A.W.B. Powell, 1937 - (RISSOIDAE)
- analoga, Lycettitrigonia analoga (J.H.F. Douvillé, 1916 †) - (RUTITRIGONIIDAE) (FOSSIL)
- analoga, Trigonia analoga J.H.F. Douvillé, 1916 † - syn of: Lycettitrigonia analoga (J.H.F. Douvillé, 1916 †) - (TRIGONIIDAE) (FOSSIL)
- analoga, Tivelina analoga (G.P. Deshayes, 1857 †) - (VENERIDAE) (FOSSIL)
- analoga, Venus analoga E. Forbes, 1846 - (VENERIDAE)
- analoga, Xylodiscula analoga A. Warén & P. Bouchet, 2001 - (XYLODISCULIDAE)
- analogia, Cellana analogia T. Iredale, 1940 - (NACELLIDAE)
- analogica, Austromitra analogica (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- analogica, Plastiscala analogica (K.H. Barnard, 1963) - (EPITONIIDAE)
- analogica, Nassa analogica G.B. III Sowerby, 1903 - syn of: Nassarius vinctus (F.P. Marrat, 1877) - (NASSARIIDAE)
- analogica, Eulimella analogica A. Peñas & E. Rolán, 2016 - (PYRAMIDELLIDAE)
- analogica, Tellina analogica G.B. III Sowerby, 1904 - (TELLINIDAE)
- analogica bellapicta, Austromitra analogica bellapicta J.C. Verco, 1909 - syn of: Austromitra bellapicta (J.C. Verco, 1909) - (COSTELLARIIDAE)
- analogica tateii, Austromitra analogica tateii (G.F. Angas, 1879) - (COSTELLARIIDAE)
- analogicus, Nassarius analogicus G.B. III Sowerby, 1903 - syn of: Nassarius vinctus (F.P. Marrat, 1877) - (NASSARIIDAE)
- Analogium, syn of: Genus Gymnodoris W. Stimpson, 1855 (GYMNODORIDIDAE)
- analogus, Arrhoges analogus (G.P. Deshayes, 1865 †) - (APORRHAIDAE) (FOSSIL)
- analogus, Surites analogus (Bogoslowsky, 1897 †) - (POLYPTYCHITIDAE) (FOSSIL)
- analuciae, Bullata analuciae P.J.S. de Souza & J.A. Coovert, 2001 - (MARGINELLIDAE)
- Analytoceras, Genus Analytoceras Gümbel, 1861 † (LYTOCERATIDAE) (FOSSIL)
- anamariae, Volvarina anamariae J. Espinosa & J.A. Ortea, 2015 - (MARGINELLIDAE)
- Anamenia, Genus Anamenia H.F. Nierstrasz, 1908 (STROPHOMENIIDAE)
- Anamesoceras, Genus Anamesoceras Zhuravleva, 1978 † (DISCOSORIDA (UNASSIGNED)) (FOSSIL)
- anamullayana, Nicida anamullayana (R.H. Beddome, 1875) - (DIPLOMMATINIDAE)
- anamurensis, Pamphylica multidentifera anamurensis (H. Nordsieck, 1994) - (CLAUSILIIDAE)
- anamurensis, Turcozonites anamurensis E. Neubert & F. Riedel, 1995 - (ZONITIDAE)
- Ananais, syn of: Subgenus Glabrocingulum (Ananias) Knight, 1945 † (GOSSELETINIDAE) (FOSSIL)
- ananas, Doris ananas Lima, Tibiriça & Simone, 2016 - (DORIDIDAE)
- ananas, Latirus ananas P.F. Röding, 1798 - syn of: Polygona infundibulum (J.F. Gmelin, 1791) - (FASCIOLARIIDAE)
- ananas, Murex ananas R.B. Hinds, 1844 - syn of: Hexaplex duplex (P.F. Röding, 1798) - (MURICIDAE)
- ananas, Cyclonema ananas J. Perner, 1903 † - (PLATYCERATIDAE) (FOSSIL)
- Anancylus, syn of: Genus Sineancylus Gutiérrez Gregoric, 2014 (PLANORBIDAE)
- Ananias, Subgenus Glabrocingulum (Ananias) Knight, 1945 † (GOSSELETINIDAE) (FOSSIL)
- ananjevi, Anunio ananjevi (Lebedev, 1958 †) - (PSEUDOHYRIIDAE) (FOSSIL)
- Ananorites, Genus Ananorites Diener, 1915 † (CERATITIDA (UNASSIGNED)) (FOSSIL)
- ananowi, Agriolimax ananowi H.R. Simroth, 1901 - syn of: Plathystimulus subagreste (H.R. Simroth, 1893) - (AGRIOLIMACIDAE)
- ananowi, Limax ananowi H.R. Simroth, 1898 - syn of: Svanetia caucasica (H.R. Simroth, 1898) - (LIMACIDAE)
- ananowi, Pseudomilax ananowi H.R. Simroth, 1901 - syn of: Drilolestes retowskii (O. Böttger, 1884) - (TRIGONOCHLAMYDIDAE)
- ananowi alticola, Limax ananowi alticola H.R. Simroth, 1912 - syn of: Svanetia caucasica (H.R. Simroth, 1898) - (LIMACIDAE)
- Ananterodonta, Genus Ananterodonta Babin & Gutiérrez, 1985 † (MODIOMORPHIDA (UNASSIGNED)) (FOSSIL)
- ananus, Murex ananus R.B. Hinds, 1844 - syn of: Takia rosarium (P.F. Röding, 1798) - (MURICIDAE)
- anao, Volvarina anao J. Espinosa & J.A. Ortea, 2012 - (MARGINELLIDAE)
- Anapa, syn of: Genus Lasaea T. Brown, 1827 (LASAEIDAE)
- Anapachydiscus, syn of: Genus Menuites Spath , 1922 † (PACHYDISCIDAE) (FOSSIL)
- anapaulae, Marginella anapaulae W. Massier, 2004 - (MARGINELLIDAE)
- Anapella, Genus Anapella W.H. Dall, 1895 (MESODESMATIDAE)
- anapensis, Bithynia anapensis L. Benoit, 1882 - syn of: Bithynia tentaculata (C. Linnaeus, 1758) - (BITHYNIIDAE)
- anapensis, Valvata macrostoma anapensis C.A. Westerlund, 1883 - (VALVATIDAE)
- Anapepta, syn of: Genus Brocchinia F.P. Jousseaume, 1887 (CANCELLARIIDAE)
- anapetes, Latirus anapetes W.P. Woodring, 1964 - syn of: Hemipolygona carinifera (J.B.P.A. Lamarck, 1816) - (FASCIOLARIIDAE)
- Anapetopsis, Genus Anapetopsis Peel, 1975 † (KNIGHTITIDAE) (FOSSIL)
- anaphiensis, Albinaria brevicollis anaphiensis (O. Böttger, 1878) - (CLAUSILIIDAE)
- anaphiensis, Zonites anaphiensis F. Riedel & M. Mylonas, 1981 - (ZONITIDAE)
- anaphora, Helix anaphora C.A. Westerlund, 1889 - syn of: Helix lucorum C. Linnaeus, 1758 - (HELICIDAE)
- anapleus, Nanaochlamys anapleus W.P. Woodring, 1946 † - (PECTINIDAE) (FOSSIL)
- anapleus kakertensis, Nanaochlamys anapleus kakertensis V.N. Sinelnikova, 1975 † - syn of: Nanaochlamys kakertensis V.N. Sinelnikova, 1975 † - (PECTINIDAE) (FOSSIL)
- anapsis, Enoploteuthis anapsis C.F.E. Roper, 1964 - (ENOPLOTEUTHIDAE)
- Anapteris, Genus Anapteris Van Winkle, 1919 † (CORBULIDAE) (FOSSIL)
- Anapuzosia, Subgenus Puzosia (Anapuzosia) Spath, 1922 † (DESMOCERATIDAE) (FOSSIL)
- anar, Proscaphites anar Oppel, 1863 † - (OPPELIIDAE) (FOSSIL)
- Anarcestes, Genus Anarcestes Mojsisovics , 1882 † (ANARCESTIDAE) (FOSSIL)
- ANARCESTIDAE Steinmann, 1890 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AGONIATITIDA [Order]-ANARCESTOIDEA [Superfamily]) (FOSSIL)
- Anarconcha, Genus Anarconcha Horný, 1964 † (PLEUROTOMARIOIDEA (UNASSIGNED)) (FOSSIL)
- anarensis, Solariella anarensis R.K. Dell, 1972 - (SOLARIELLIDAE)
- Anarithma, Genus Anarithma T. Iredale, 1916 (MITROMORPHIDAE)
- Anascaphites, Genus Anascaphites Hyatt in Eastman-Zittel, 1900 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- Anasibirites, Genus Anasibirites Chao, 1959 † (MELAGATHICERATIDAE) (FOSSIL)
- Anasirenites, Genus Anasirenites Mojsisovics , 1893 † (TRACHYCERATIDAE) (FOSSIL)
- ANASPIDEA (UNASSIGNED) - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-ANASPIDEA [Order]) (FOSSIL)
- Anaspyroceras, Genus Anaspyroceras Shimizu & Obata, 1935 † (DAWSONOCERATIDAE) (FOSSIL)
- anassa, Emarginula anassa A. Dean, 1926 - syn of: Emarginula crassa J. de C. Sowerby, 1813 - (FISSURELLIDAE)
- anassa, Zinsitys anassa Saul, 1988 † - (PERISSITYIDAE) (FOSSIL)
- anassa, Thyasira anassa P.G. Oliver, 2015 - (THYASIRIDAE)
- Anasser, syn of: Genus Olivella W.J. Swainson, 1831 (OLIVELLIDAE)
- anastasiae, Trochorbis anastasiae Z.I. Izzatullaev, 1973 - (PLANORBIDAE)
- Anastes, Genus Anastes Klein † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Anastoma, syn of: Genus Anostoma G. Fischer von Waldheim, 1807 (ODONTOSTOMIDAE)
- Anastomoceras, Genus Anastomoceras Flower, 1939 † (SPYROCERATIDAE) (FOSSIL)
- ANASTOMOPSIDAE H. Nordsieck, 1986 † - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-PUNCTOIDEA [Superfamily]) (FOSSIL)
- Anastomopsis, Genus Anastomopsis Sandberger, 1871 (ANASTOMOPSIDAE) (FOSSIL)
- anastomosis, Teinostoma anastomosis F. Rubio, E. Rolán & Y.C. Lee, 2011 - (TORNIDAE)
- Anastrophina, Genus Anastrophina Knight, 1937 † (HOLOPEIDAE) (FOSSIL)
- anataria, Spatha anataria C.F. Jickeli, 1874 - syn of: Chambardia rubens (J.B.P.A. Lamarck, 1819) - (IRIDINIDAE)
- anataria, Anodonta anataria G.J. De Cristofori & G. Jan, 1832 - syn of: Chambardia rubens (J.B.P.A. Lamarck, 1819) - (UNIONIDAE)
- Anatasia, syn of: Genus Rissoa M. Freminville in A.G. Desmarest, 1814 (RISSOIDAE)
- anatellinoides, Anodontia anatellinoides L.A. Reeve, 1850 - syn of: Anodontia alba J.H.F. Link, 1807 - (LUCINIDAE)
- anatellus, Canarium anatellus P.L. Duclos in J.C. Chenu, 1844 - syn of: Canarium urceus (C. Linnaeus, 1758) - (STROMBIDAE)
- anatensis, Theodoxus anatensis G.B. Sowerby, 1849 - (NERITIDAE)
- anatia, Donax anatia J.B.P.A. Lamarck, 1810 - (DONACIDAE)
- Anatibetites, Genus Anatibetites Mojsisovics , 1896 † (TIBETITIDAE) (FOSSIL)
- anaticepsella, Cardiomya anaticepsella C.J.S. Hickman, 2014 † - (CUSPIDARIIDAE) (FOSSIL)
- anaticula, Kolymia anaticula Astaf'yeva, 1988 † - (KOLYMIIDAE) (FOSSIL)
- anatiformis, Pterotheca anatiformis (J.W. Hall, 1847 †) - (PTEROTHECIDAE) (FOSSIL)
- Anatimya, Genus Anatimya Conrad, 1860 † (LATERNULIDAE) (FOSSIL)
- anatina, Tenuicorbula anatina (J.B.P.A. Lamarck, 1806 †) - (CORBULIDAE) (FOSSIL)
- anatina, Donax anatina B.C.M. Payraudeau, 1826 - (DONACIDAE)
- anatina, Pseudamnicola anatina (J.P.R. Draparnaud) - (HYDROBIIDAE)
- anatina, Mercuria anatina (J.L.M. Poiret, 1801) - (HYDROBIIDAE)
- anatina, Pyrgulopsis anatina R. Hershler, 1998 - (HYDROBIIDAE)
- anatina, Laternula anatina (C. Linnaeus, 1758) - (LATERNULIDAE)
- Anatina, Genus Anatina H.C.F. Schumacher, 1817 (MACTRIDAE)
- anatina, Anatina anatina (L. Spengler, 1802) - (MACTRIDAE)
- anatina, Mactra anatina L. Spengler, 1802 - syn of: Anatina anatina (L. Spengler, 1802) - (MACTRIDAE)
- anatina, Tugonia anatina (J.F. Gmelin, 1791) - (MYIDAE)
- anatina, Mya anatina J.F. Gmelin, 1791 - syn of: Tugonia anatina (J.F. Gmelin, 1791) - (MYIDAE)
- anatina, Patella anatina E. Donovan, 1820 - syn of: Scutus anatinus (E. Donovan, 1820) - (PATELLIDAE)
- anatina, Pholadomya anatina Kalishevich, 1981 † - (PHOLADOMYIDAE) (FOSSIL)
- anatina, Anodonta anatina (C. Linnaeus, 1758) - (UNIONIDAE)
- anatina, Anodonta anatina S. Clessin, 1876 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- anatina, Anodonta anatina T. Brown, 1845 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- anatina, Anodonta anatina G. Stabile, 1845 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- anatina, Tapes anatina G.B. II Sowerby, 1854 - syn of: Polititapes aureus (J.F. Gmelin, 1791) - (VENERIDAE)
- anatina, Scissileda anatina (E.A. Smith, 1896) - (YOLDIIDAE)
- anatina constricta, Laternula anatina constricta (L.A. Reeve, 1863) - (LATERNULIDAE)
- anatina elongata, Anodonta anatina elongata A. Brot, 1867 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- anatina major, Anodonta anatina major A. Brot, 1867 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- anatina monstrosa, Anodonta anatina monstrosa A. Brot, 1867 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- anatina petshorica, Anodonta anatina petshorica V.I. Zhadin, 1938 - syn of: Anodonta anatina (C. Linnaeus, 1758) - (UNIONIDAE)
- anatina platyrhyncha, Anodonta anatina platyrhyncha C.A. Westerlund, 1890 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- anatina rostrata, Anodonta anatina rostrata A. Brot, 1867 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- Anatinella, Genus Anatinella G.B. Sowerby, 1833 (ANATINELLIDAE)
- ANATINELLIDAE Deshayes, 1853 - Family (BIVALVIA-HETERODONTA [Subclass]-EUHETERODONTA [Infraclass]-IMPARIDENTIA [Superorder]-VENERIDA [Order]-MACTROIDEA [Superfamily])
- anatinoides, Raeta anatinoides L.A. Reeve, 1854 - syn of: Raeta pellicula (L.A. Reeve, 1854) - (MACTRIDAE)
- anatinoides, Poromya anatinoides E. Forbes, 1844 - syn of: Poromya granulata (P. Nyst & G.D. Westendorp, 1839) - (POROMYIDAE)
- anatinoides, Thracidentula anatinoides (L.A. Reeve, 1859) - (THRACIIDAE)
- anatinum, Drepanotrema anatinum (A.V.M.D. D'Orbigny, 1835) - (PLANORBIDAE)
- anatinum, Leptodesma anatinum Whidborne, 1897 † - (PTERINEIDAE) (FOSSIL)
- anatinus, Donax trunculus anatinus J.B.P.A. Lamarck, 1818 - (DONACIDAE)
- anatinus, Scutus anatinus (E. Donovan, 1820) - (FISSURELLIDAE)
- anatinus, Malleus anatinus (J.F. Gmelin, 1791) - (MALLEIDAE)
- anatinus, Mytilus anatinus C. Linnaeus, 1758 - syn of: Anodonta anatina (C. Linnaeus, 1758) - (MYTILIDAE)
- anatinus, Mytilus anatinus R. Sheppard, 1821 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (MYTILIDAE)
- anatinus, Mytilus anatinus T. Sturm, 1803 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (MYTILIDAE)
- anatinus, Ostrea anatinus J.F. Gmelin, 1791 - syn of: Malleus anatinus (J.F. Gmelin, 1791) - (OSTREIDAE)
- anatinus, Solen anatinus C. Linnaeus, 1758 - syn of: Laternula anatina (C. Linnaeus, 1758) - (SOLENIDAE)
- anatipes, Quadrinervus anatipes (Buvignier, 1852 †) - (APORRHAIDAE) (FOSSIL)
- anatipes, Anatipopecten anatipes (Morton, 1833 †) - (PECTINIDAE) (FOSSIL)
- Anatipopecten, Subgenus Chlamys (Anatipopecten) Hertlein, 1936 † (PECTINIDAE) (FOSSIL)
- anatisana, Loxana anatisana (P.M. Pallary, 1928) - (HELICIDAE)
- anatispretia, Setobaudinia anatispretia G.A. Solem, 1985 - (CAMAENIDAE)
- anatokiensis, Powelliphanta hochstetteri anatokiensis (A.W.B. Powell, 1938) - (RHYTIDIDAE)
- anatola, Lamellospira anatola Batten, 1972 † - (PHYMATOPLEURIDAE) (FOSSIL)
- anatolensis, Parachondria anatolensis Watters, 2016 - (POMATIIDAE)
- anatolica, Bythinella anatolica M.Z. Yildirim, Ü. Kebapçi & A. Yüce, 2014 - (BYTHINELLIDAE)
- anatolica, Albinaria anatolica (J.R. Roth, 1839) - (CLAUSILIIDAE)
- anatolica, Dreissena anatolica É.A.A. Locard, 1893 - (DREISSENIDAE)
- anatolica, Nipponomaria anatolica (Enderle, 1901 †) - (GOSSELETINIDAE) (FOSSIL)
- anatolica, Helix cincta anatolica W. Kobelt, 1891 - (HELICIDAE)
- anatolica, Staja anatolica (Willmann, 1982 †) - (HYDROBIIDAE) (FOSSIL)
- anatolica, Islamia anatolica P. Radoman, 1973 - (HYDROBIIDAE)
- anatolica, Turkorientalia anatolica P. Radoman, 1973 - (HYDROBIIDAE)
- anatolica, Graecoanatolica anatolica (H. Schütt, 1965) - (HYDROBIIDAE)
- anatolica, Fagotia anatolica J.R. Bourguignat, 1884 - syn of: Esperiana esperi (A.E.J. Férussac, 1823) - (MELANOPSIDAE)
- anatolica, Pleurotomaria anatolica Enderle, 1901 † - syn of: Nipponomaria anatolica (Enderle, 1901 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- anatolica, Darendeella anatolica Karacabey-öztemür, 1976 † - (RADIOLITIDAE) (FOSSIL)
- anatolica apicalis, Albinaria anatolica apicalis (O. Böttger, 1883) - (CLAUSILIIDAE)
- anatolicum, Sageceras anatolicum Arthaber, 1914 † - (SAGECERATIDAE) (FOSSIL)
- anatolicus, Acroloxus anatolicus H. Schütt in H. Schütt & Kavusan, 1984 † - (ACROLOXIDAE) (FOSSIL)
- anatolicus, Fusinus anatolicus F. Toula, 1901 † - (FASCIOLARIIDAE) (FOSSIL)
- anatolicus, Theodoxus anatolicus C.A. Récluz, 1841 - (NERITIDAE)
- anatolicus, Monophyllites anatolicus F. Toula, 1896 † - (USSURITIDAE) (FOSSIL)
- anatolicus, Zonites festae anatolicus F. Riedel, 1982 - (ZONITIDAE)
- Anatolidamnicola, Genus Anatolidamnicola S.K. Sahin, S.B. Koca & M.Z. Yildirim, 2012 (HYDROBIIDAE)
- Anatolya, Genus Anatolya Páll-Gergely & Bank, 2016 (ENIDAE)
- Anatoma, Genus Anatoma S. Woodward, 1859 (ANATOMIDAE)
- anatomica, Homalocantha anatomica (G. Perry, 1811) - (MURICIDAE)
- anatomica elatensis, Homalocantha anatomica elatensis E.L. Heiman & H.K. Mienis, 2009 - syn of: Homalocantha elatensis E.L. Heiman & H.K. Mienis, 2009 - (MURICIDAE)
- anatomica pele, Homalocantha anatomica pele (H.A. Pilsbry, 1918) - syn of: Homalocantha pele (H.A. Pilsbry, 1918) - (MURICIDAE)
- anatomica zamboi, Homalocantha anatomica zamboi J.Q. Burch & R.L. Burch, 1960 - syn of: Homalocantha zamboi (J.Q. Burch & R.D. Burch, 1960) - (MURICIDAE)
- ANATOMIDAE McLean, 1989 - Family (GASTROPODA-VETIGASTROPODA [Subclass]-SCISSURELLOIDEA [Superfamily])
- Anatomites, Genus Anatomites Mojsisovics , 1893 † (HALORITIDAE) (FOSSIL)
- Anatomus, syn of: Genus Anatoma S. Woodward, 1859 (ANATOMIDAE)
- anatonuensis, Nesonoica anatonuensis C.M. Cooke & Y. Kondo, 1960 - (ACHATINELLIDAE)
- anatorum, Dentalium anatorum A.H. Cooke, 1885 - (DENTALIIDAE)
- Anatrophon, Genus Anatrophon T. Iredale, 1929 (MURICIDAE)
- Anatropites, Genus Anatropites Anatropites † (TROPITIDAE) (FOSSIL)
- Anatsabites, Genus Anatsabites Ruzhencev , 1957 † (PARAGASTRIOCERATIDAE) (FOSSIL)
- Anaucella, syn of: Genus Buchia Rouillier, 1845 † (BUCHIIDAE) (FOSSIL)
- Anauchen, Genus Anauchen H.A. Pilsbry, 1917 (HYPSELOSTOMATIDAE)
- Anaulacia, syn of: Genus Ancilla J.B.P.A. Lamarck, 1799 (ANCILLARIIDAE)
- Anaulax, syn of: Genus Ancilla J.B.P.A. Lamarck, 1799 (ANCILLARIIDAE)
- anaulax, Norrisia anaulax A.E.M. Cossmann † - (TEGULIDAE) (FOSSIL)
- Anaulus, syn of: Genus Raphaulus L. Pfeiffer, 1856 (PUPINIDAE)
- anauniense, Cingulifera cingulatum anauniense (F.E. De Betta, 1852) - (HELICIDAE)
- anauniensis, Helix anauniensis F.E. De Betta, 1852 - syn of: Cingulifera cingulatum baldense (E.A. Rossmässler, 1839) - (HELICIDAE)
- Anavirgatites, Genus Anavirgatites Spath, 1925 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- Anawasatchites, Genus Anawasatchites McLearn , 1945 † (PRIONITIDAE) (FOSSIL)
- anax, Corilla anax (W.H. Benson, 1865) - (CORILLIDAE)
- anaxares, Morula anaxares (L.C. Kiener, 1836) - (MURICIDAE)
- Anaxenaspis, Genus Anaxenaspis Kiparisova , 1956 † (FLEMINGITIDAE) (FOSSIL)
- anaxia, Miratellina anaxia W.P. Woodring, 1982 † - (TELLINIDAE) (FOSSIL)
- anaxium, Lyrocardium anaxium P.G. Oliver & H.C.G. Chesney, 1997 - (CARDIIDAE)
- anaxium dekkeri, Lyrocardium anaxium dekkeri H.K. Mienis, 2009 - syn of: Lyrocardium anaxium P.G. Oliver & H.C.G. Chesney, 1997 - (CARDIIDAE)
- anayana, Tambja anayana J.A. Ortea, 1989 - (POLYCERIDAE)
- Anazola, Subgenus Agaronia (Anazola) J.E. Gray, 1858 (OLIVIDAE)
- anazora, Olivella anazora (P.L. Duclos, 1835) - (OLIVELLIDAE)
- anazora, Oliva anazora P.L. Duclos, 1835 - syn of: Olivella anazora (P.L. Duclos, 1835) - (OLIVIDAE)
- Anbullina, Subgenus Bullia (Anbullina) Palmer, 1937 (NASSARIIDAE)
- Anbulus, syn of: Genus Angulus J.K. Megerle Von Mühlfeld, 1811 (TELLINIDAE)
- Ancaeus, syn of: Genus Planorbella S.S. Haldeman, 1842 (PLANORBIDAE)
- ancashensis, Hemicena polinskiana ancashensis E. Neubert & H. Nordsieck, 2005 - (CLAUSILIIDAE)
- ancatruzi, Isocyprina ancatruzi H.A. Leanza, 1942 † - (ARCTICIDAE) (FOSSIL)
- ancavilorum, Bostryx ancavilorum J.F. Araya, 2015 - (BULIMULIDAE)
- anceophila, Carelia anceophila C.M. Cooke, 1931 - (AMASTRIDAE)
- anceps, Agathiceras anceps C. Gemmellaro, 1887 † - (AGATHICERATIDAE) (FOSSIL)
- anceps, Chenopus anceps C.L.F. von Sandberger, 1861 † - (APORRHAIDAE) (FOSSIL)
- Anceps, Genus Anceps Kolesnikov, 1939 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- anceps, Holkeion anceps (A.A. Gould) - (ARIOPHANTIDAE)
- anceps, Baculites anceps J.B.P.A. Lamarck, 1822 † - (BACULITIDAE) (FOSSIL)
- anceps, Drymaeus anceps J.A. Albers, 1854 - (BULIMULIDAE)
- anceps, Capulus anceps O.G. Michelotti, 1861 † - (CAPULIDAE) (FOSSIL)
- anceps, Marshallopsis anceps A. Cecalupo & I. Perugia, 2013 - (CERITHIOPSIDAE)
- anceps, Clausilia anceps A. Schmidt, 1856 - syn of: Clausilia bidentata (H. Strøm, 1765) - (CLAUSILIIDAE)
- anceps, Euplica anceps R.P.J. Hervier, 1899 - syn of: Euplica deshayesii (J.C.H. Crosse, 1859) - (COLUMBELLIDAE)
- anceps, Conus anceps A. Adams, 1855 - syn of: Pionoconus consors (G.B. I Sowerby, 1833) - (CONIDAE)
- anceps, Caestocorbula anceps P.A. Maxwell, 1992 † - (CORBULIDAE) (FOSSIL)
- anceps, Japonia anceps J.J. Vermeulen, T.S. Liew & M. Schilthuizen, 2015 - (CYCLOPHORIDAE)
- anceps, Corbicula anceps Wood † - (CYRENIDAE) (FOSSIL)
- anceps, Atagema anceps (L.S.R. Bergh, 1890) - (DISCODORIDIDAE)
- anceps, Menon anceps C. Hedley, 1900 - (EULIMIDAE)
- anceps, Gonioceras anceps J.W. Hall, 1847 † - (GONIOCERATIDAE) (FOSSIL)
- anceps, Nematotrochus anceps E.F.R.K. Koken & J. Perner, 1925 † - syn of: Straparollina anceps (E.F.R.K. Koken & J. Perner, 1925 †) - (HOLOPEIDAE) (FOSSIL)
- anceps, Sulawesidrobia anceps S. Zielske, M. Glaubrecht & M. Haase, 2011 - (HYDROBIIDAE)
- anceps, Limopsis anceps K.H.J. Thiele & S.G.A. Jaeckel, 1931 - syn of: Limopsis abyssicola A. Adams, 1863 - (LIMOPSIDAE)
- anceps, Lucina anceps Laube, 1865 † - (LUCINIDAE) (FOSSIL)
- anceps, Melanopsis anceps Gaudry & P. Fischer in Gaudry, 1867 † - (MELANOPSIDAE) (FOSSIL)
- anceps, Aspella anceps (J.B.P.A. Lamarck, 1822) - (MURICIDAE)
- anceps, Trophon anceps R. Tate, 1888 † - (MURICIDAE) (FOSSIL)
- anceps, Helisoma anceps (K.T. Menke, 1830) - (PLANORBIDAE)
- anceps, Tropidophora anceps (E.C. Von Martens, 1878) - (POMATIIDAE)
- anceps, Ondina anceps A. Gaglini, 1992 - (PYRAMIDELLIDAE)
- anceps, Ranella anceps J.B.P.A. Lamarck, 1822 - syn of: Aspella anceps (J.B.P.A. Lamarck, 1822) - (RANELLIDAE)
- anceps, Teretia anceps (K.E.I. von Eichwald, 1830 †) - (RAPHITOMIDAE) (FOSSIL)
- anceps, Teretia anceps Auct. non K.E.I. von Eichwald, 1830 - syn of: Teretia teres (L.A. Reeve, 1844) - (RAPHITOMIDAE)
- anceps, Reineckeia anceps Reinecke, 1818 † - (REINECKEIIDAE) (FOSSIL)
- anceps, Sinuites anceps Reed, 1921 † - (SINUITIDAE) (FOSSIL)
- anceps, Pisidium anceps H.B. Herrington, 1954 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- anceps, Straparollina anceps (E.F.R.K. Koken & J. Perner, 1925 †) - (STRAPAROLLINIDAE) (FOSSIL)
- anceps, Germanonautilus anceps E.S. Sobolev, 1989 † - (TAINOCERATIDAE) (FOSSIL)
- anceps, Cyclostremiscus anceps (C.R. Laws, 1941 †) - (TORNIDAE) (FOSSIL)
- anceps, Turritella anceps Woods, in Bosworth, 1922 † - (TURRITELLIDAE) (FOSSIL)
- anceps, Unio anceps G.P. Deshayes, 1875 - syn of: Contradens gratiosus (R.A. Philippi, 1845) - (UNIONIDAE)
- anceps, Venus anceps G.P. Deshayes, 1857 † - (VENERIDAE) (FOSSIL)
- anceps, Lyria anceps O.G. Michelotti, 1861 † - (VOLUTIDAE) (FOSSIL)
- anceps bartschii, Helisoma anceps bartschii H.B. Baker, 1945 - (PLANORBIDAE)
- anceps crassicosta, Melanopsis anceps crassicosta Gaudry & P. Fischer in Gaudry, 1867 † - (MELANOPSIDAE) (FOSSIL)
- anceps idahoense, Helisoma anceps idahoense H.B. Baker, 1945 - (PLANORBIDAE)
- anceps politum, Helisoma anceps politum H.B. Baker, 1945 - (PLANORBIDAE)
- anceps royalense, Helisoma anceps royalense B. Walker, 1909 - (PLANORBIDAE)
- ancestralis, Exilitheca ancestralis A.V. Sysoev, 1968 † - (ALLATHECIDAE) (FOSSIL)
- ancestralis, Chama ancestralis A.E.M. Cossmann, 1909 † - (CHAMIDAE) (FOSSIL)
- ancestralis, Clymenia ancestralis (Bogoslovsky, 1979 †) - (CLYMENIIDAE) (FOSSIL)
- ancestralis, Aktuboclymenia ancestralis Bogoslovsky, 1979 † - syn of: Clymenia ancestralis (Bogoslovsky, 1979 †) - (CLYMENIIDAE) (FOSSIL)
- ancestralis, Persiaster ancestralis Repin, 2008 † - (MYTILIDAE) (FOSSIL)
- Anceya, Genus Anceya J.R. Bourguignat, 1884 (PALUDOMIDAE)
- anceyana, Tornatellaria anceyana C.M. Cooke & H.A. Pilsbry, 1916 - (ACHATINELLIDAE)
- anceyana, Partulina anceyana D.D. Baldwin, 1895 - (ACHATINELLIDAE)
- anceyana, Leptachatina anceyana C.M. Cooke, 1910 - (AMASTRIDAE)
- anceyana, Taipidon anceyana (A. Garrett, 1887) - (ENDODONTIDAE)
- anceyana, Fagotia anceyana J.R. Bourguignat, 1884 - (MELANOPSIDAE)
- anceyana, Lyropupa anceyana C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- anceyanum, Elasmias anceyanum H.A. Pilsbry & C.M. Cooke, 1915 - (ACHATINELLIDAE)
- anceyanus, Kalidos anceyanus E. Fischer-Piette, Ch.P. Blanc, F. Blanc & F. Salvat, 1966 - syn of: Kalidos anceyianus E. Fischer-Piette, Ch.P. Blanc, F. Blanc & F. Salvat, 1966 - (ARIOPHANTIDAE)
- anceyi, Naesiotus amastroides anceyi W.H. Dall, 1893 - (BULIMULIDAE)
- anceyi, Abida stabilei anceyi (P. Fagot, 1881) - (CHONDRINIDAE)
- anceyi, Euphaedusa anceyi (O. Böttger, 1882) - (CLAUSILIIDAE)
- anceyi, Moncetia anceyi J.R. Bourguignat, 1885 - (IRIDINIDAE)
- anceyi, Spatha anceyi C.M.F. Ancey, 1894 - syn of: Chambardia wahlbergi (C.F.F. von Krauss, 1848) - (IRIDINIDAE)
- anceyi, Mediterranea anceyi C.A. Westerlund, 1886 - syn of: Mediterranea hydatina (E.A. Rossmässler, 1838) - (OXYCHILIDAE)
- anceyi, Gudeodiscus anceyi (G.P.L.K. Gude, 1901) - (PLECTOPYLIDAE)
- anceyi, Pupina anceyi A.R.J.B. Bavay & P. Dautzenberg, 1899 - (PUPINIDAE)
- anceyi, Pleurotomella anceyi (P. Dautzenberg & H. Fischer, 1897) - (RAPHITOMIDAE)
- anceyi, Haploptychius anceyi (J.F. Mabille, 1887) - (STREPTAXIDAE)
- anceyi, Prosopeas anceyi H.A. Pilsbry, 1906 - (SUBULINIDAE)
- anceyi, Pleurotoma anceyi P. Dautzenberg & H. Fischer, 1897 - syn of: Pleurotomella anceyi (P. Dautzenberg & H. Fischer, 1897) - (TURRIDAE)
- anceyi, Brazzaea anceyi J.R. Bourguignat, 1885 - (UNIONIDAE)
- anceyi, Trochonanina anceyi (J.R. Bourguignat, 1885) - (UROCYCLIDAE)
- Anceyia, syn of: Genus Pristiloma C.M.F. Ancey, 1887 (PRISTILOMATIDAE)
- anceyianus, Kalidos anceyianus E. Fischer-Piette, Ch.P. Blanc, F. Blanc & F. Salvat, 1966 - (ARIOPHANTIDAE)
- Anceyiella, Subgenus Acroptychia (Anceyiella) J.F. Mabille, 1886 (MEGALOMASTOMIDAE)
- Anceyodonta, Genus Anceyodonta G.A. Solem, 1976 (ENDODONTIDAE)
- anchana, Sonorella anchana S.S. Berry, 1948 - (HELMINTHOGLYPTIDAE)
- anchana, Oreohelix anchana W.O. Gregg, 1953 - (OREOHELICIDAE)
- Anchistoma, syn of: Genus Polygyra T. Say, 1818 (POLYGYRIDAE)
- Anchomasa, Subgenus Barnea (Anchomasa) W.E. Leach, 1852 (PHOLADIDAE)
- Anchomosa, syn of: Genus Barnea A. Risso, 1826 (PHOLADIDAE)
- anchoralis, Thracia anchoralis R.N. Kilburn, 1975 - (THRACIIDAE)
- anchoreta, Petricola anchoreta L. de Folin, 1867 - syn of: Choristodon robustus (G.B. I Sowerby, 1834) - (VENERIDAE)
- Anchosoma, syn of: Genus Barnea A. Risso, 1826 (PHOLADIDAE)
- Anchuispira, syn of: Genus Anhuiconus Zhou & Xiao, 1984 † (HELCIONELLIDAE) (FOSSIL)
- Anchura, Genus Anchura Conrad, 1860 † (APORRHAIDAE) (FOSSIL)
- ancile, Haliotis ancile L.A. Reeve, 1846 - syn of: Haliotis rubra W.E. Leach, 1814 - (HALIOTIDAE)
- Ancilla, Genus Ancilla J.B.P.A. Lamarck, 1799 (ANCILLARIIDAE)
- ancilla, Orrmaesia ancilla (K.H.J. Thiele, 1925) - (DRILLIIDAE)
- ancilla, Praelucina ancilla Barrande, 1881 † - (PRAELUCINIDAE) (FOSSIL)
- ancilla, Fulmentum ancilla (S.C.T. Hanley, 1860) - (PSEUDOLIVIDAE)
- ancilla, Tellina ancilla S.C.T. Hanley, 1844 - (TELLINIDAE)
- ancilla, Dicyathifer ancilla K.H. Barnard, 1964 - syn of: Dicyathifer mannii (B.H. Wright, 1866) - (TEREDINIDAE)
- ancilla, Teredo ancilla K.H. Barnard, 1964 - syn of: Dicyathifer mannii (B.H. Wright, 1866) - (TEREDINIDAE)
- ancilla, Coronia ancilla (T.L. Casey, 1903 †) - (TURRIDAE) (FOSSIL)
- ancilla, Adelomelon ancilla (J. Lightfoot, 1786) - (VOLUTIDAE)
- ancilla barattinii, Adelomelon ancilla barattinii M.A. Klappenbach & E.H. Ureta, 1966 - (VOLUTIDAE)
- ancilla martensi, Adelomelon ancilla martensi (H. Strebel, 1906) - (VOLUTIDAE)
- ancillaeformis, Bullia ancillaeformis E.A. Smith, 1906 - (NASSARIIDAE)
- Ancillaria, syn of: Genus Ancilla J.B.P.A. Lamarck, 1799 (ANCILLARIIDAE)
- ancillaria, Archicypraea ancillaria L. Dolin & J.M. Pacaud, 2009 † - (CYPRAEIDAE) (FOSSIL)
- ancillaria, Oliva ancillaria J.B.P.A. Lamarck, 1811 - syn of: Agaronia hiatula (J.F. Gmelin, 1791) - (OLIVIDAE)
- ancillaria, Physella ancillaria (T. Say, 1825) - (PHYSIDAE)
- ancillaria warreniana, Physa ancillaria warreniana I. Lea, 1864 - syn of: Physella sayi warreniana (I. Lea, 1864) - (PHYSIDAE)
- ancillariaeforme, Cyllenina ancillariaeforme (J.P.S. Grateloup, 1834 †) - (NASSARIIDAE) (FOSSIL)
- ANCILLARIIDAE Swainson, 1840 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-NEOGASTROPODA [Order]-OLIVOIDEA [Superfamily])
- Ancillarina, Genus Ancillarina L.M.D. Bellardi, 1882 † (ANCILLARIIDAE) (FOSSIL)
- ancillarioides, Cylichnium ancillarioides (M.M. Schepman, 1913) - (HAMINOEIDAE)
- ancillarioides, Agaronia ancillarioides (L.A. Reeve, 1850) - (OLIVIDAE)
- ancillarioides, Volvulopsis ancillarioides M.M. Schepman, 1913 - syn of: Cylichnium ancillarioides (M.M. Schepman, 1913) - (RETUSIDAE)
- ancillaroides, Melanopsis ancillaroides G.P. Deshayes, 1825 † - (MELANOPSIDAE) (FOSSIL)
- ancillaroides alpina, Melanopsis ancillaroides alpina F. Traub, 1938 † - (MELANOPSIDAE) (FOSSIL)
- ancillides, Mitra ancillides W.J. Broderip, 1836 - (MITRIDAE)
- Ancillina, Genus Ancillina L.M.D. Bellardi, 1882 (ANCILLARIIDAE)
- Ancillista, Genus Ancillista T. Iredale, 1936 (ANCILLARIIDAE)
- ancilloides, Marginella ancilloides W.H. Turton, 1932 - syn of: Marginella piperata R.B. Hinds, 1844 - (MARGINELLIDAE)
- ancilloides, Ericusa ancilloides R. Tate, 1889 † - (VOLUTIDAE) (FOSSIL)
- ancillops, Ancillaria ancillops A. Heilprin, 1891 † - syn of: Anbullina ancillops (A. Heilprin, 1891 †) - (ANCILLARIIDAE) (FOSSIL)
- ancillops, Anbullina ancillops (A. Heilprin, 1891 †) - (NASSARIIDAE) (FOSSIL)
- Ancillopsis, Genus Ancillopsis T.A. Conrad, 1865 (NASSARIIDAE)
- ancillotoi, Epitonium ancillotoi T. Cossignani & V. Cossignani, 1998 - (EPITONIIDAE)
- Ancillus, Subgenus Ancilla (Ancillus) Monfort, 1810 † (ANCILLARIIDAE) (FOSSIL)
- Ancillus, syn of: Genus Ancilla J.B.P.A. Lamarck, 1799 (ANCILLARIIDAE)
- ancipitia, Micatheca ancipitia A.V. Sysoev, 1972 † - (ALLATHECIDAE) (FOSSIL)
- ancisa, Odostomia ancisa (J. Marwick, 1931 †) - (PYRAMIDELLIDAE) (FOSSIL)
- ancisa, Callista ancisa J. Marwick 1938 † - (VENERIDAE) (FOSSIL)
- Ancistosyrinx, syn of: Genus Ancistrosyrinx W.H. Dall, 1881 (COCHLESPIRIDAE)
- ANCISTROBASIDAE Bandel, 2010 - Family (GASTROPODA-VETIGASTROPODA [Subclass]-SEGUENZIOIDEA [Superfamily])
- Ancistrobasis, Genus Ancistrobasis W.H. Dall, 1889 (ANCISTROBASIDAE)
- Ancistroceras, Genus Ancistroceras Remele, 1881 † (LITUITIDAE) (FOSSIL)
- ANCISTROCHEIRIDAE Pfeffer, 1912 - Family (CEPHALOPODA-COLEOIDEA [Subclass]-DECAPODIFORMES [Superorder]-OEGOPSIDA [Order])
- Ancistrocheirus, Genus Ancistrocheirus J.E. Gray, 1849 (ANCISTROCHEIRIDAE)
- Ancistrochirus, syn of: Genus Ancistrocheirus J.E. Gray, 1849 (ANCISTROCHEIRIDAE)
- Ancistrolepis, Genus Ancistrolepis W.H. Dall, 1895 (BUCCINIDAE)
- Ancistrolepsis, syn of: Genus Ancistrolepis W.H. Dall, 1895 (BUCCINIDAE)
- Ancistromesus, syn of: Genus Scutellastra H. Adams & A. Adams, 1854 (PATELLIDAE)
- Ancistrosyrinx, Genus Ancistrosyrinx W.H. Dall, 1881 (COCHLESPIRIDAE)
- Ancistroteuthis, Genus Ancistroteuthis J.E. Gray, 1849 (ONYCHOTEUTHIDAE)
- ancisum, Cerithium ancisum (M. Yokoyama †) - (CERITHIIDAE) (FOSSIL)
- ancliffensis, Catinula ancliffensis Cox & Arkell, 1948 † - (GRYPHAEIDAE) (FOSSIL)
- Ancliffia, Genus Ancliffia Cox & Arkell, 1948 (CARDIIDA (UNASSIGNED)) (FOSSIL)
- Anclyoceras, syn of: Genus Ancyloceras D'Orbigny , 1842 † (ANCYLOCERATIDAE) (FOSSIL)
- Ancolioceras, syn of: Genus Leioceras Chandler & Callomon, 2009 † (GRAPHOCERATIDAE) (FOSSIL)
- Ancomena, Subgenus Haplotrema (Ancomena) F.C. Baker, 1931 (HAPLOTREMATIDAE)
- anconae, Joculator anconae Cecalupo & Perugia, 2017 - (CERITHIOPSIDAE)
- anconae, Cingulifera cingulatum anconae (C. Gentiluomo, 1868) - (HELICIDAE)
- anconae, Theodoxus anconae (G. Capellini, 1880 †) - (NERITIDAE) (FOSSIL)
- anconae, Valvata anconae C. De Stefani, 1877 † - (VALVATIDAE) (FOSSIL)
- anconai, Pollia anconai (Malatesta, 1960 †) - (BUCCINIDAE) (FOSSIL)
- anconai, Coelocentrum anconai P. Bartsch, 1948 - (UROCOPTIDAE)
- anconai, Coelostemma anconai P. Bartsch, 1951 - (UROCOPTIDAE)
- anconensis, Thracia anconensis A.A. Olsson, 1961 - (THRACIIDAE)
- Anconia, Genus Anconia Olsson , 1931 † (THIARIDAE) (FOSSIL)
- Anconochilus, Genus Anconochilus Knight, 1947 † (COREOSPIRIDAE) (FOSSIL)
- anconostoma, Helix anconostoma R.T. Lowe, 1831 - syn of: Lauria cylindracea (E.M. Da Costa, 1778) - (HELICIDAE)
- anconostoma, Lauria anconostoma R.T. Lowe, 1831 - syn of: Lauria cylindracea (E.M. Da Costa, 1778) - (LAURIIDAE)
- ancora, Hippocardia ancora Hoare, Steinker & Mapes, 1988 † - syn of: Hadropipetta ancora (Hoare, Steinker & Mapes, 1988 †) - (HIPPOCARDIIDAE) (FOSSIL)
- ancora, Hadropipetta ancora (Hoare, Steinker & Mapes, 1988 †) - (PSEUDOBIGALEAIDAE) (FOSSIL)
- Ancotrema, Subgenus Haplotrema (Ancotrema) F.C. Baker, 1931 (HAPLOTREMATIDAE)
- anctartica, Clione anctartica E.A. Smith, 1902 - syn of: Clione limacina (C.J. Phipps, 1774) - (CLIONIDAE)
- anctostoma, Helix anctostoma E.C. Von Martens, 1874 - (HELICIDAE)
- Anctus, Genus Anctus E.C. Von Martens, 1860 (ORTHALICIDAE)
- Ancula, Genus Ancula S.L. Lovén, 1846 (GONIODORIDIDAE)
- Anculosa, Genus Anculosa T. Say, 1821 (PLEUROCERIDAE)
- Anculotus, syn of: Genus Anculosa T. Say, 1821 (PLEUROCERIDAE)
- ancycla, Cancellaria ancycla J. Gardner, 1937 † - (CANCELLARIIDAE) (FOSSIL)
- Ancylastrum, Genus Ancylastrum J.R. Bourguignat, 1853 (PLANORBIDAE)
- Ancylezeiceras, Genus Ancylezeiceras Vermeulen, 2006 † (HEMIHOPLITIDAE) (FOSSIL)
- ANCYLIDAE - syn of Family: PLANORBIDAE
- ancyliformis, Pileopsis ancyliformis J.P.S. Grateloup, 1828 † - syn of: Plesiothyreus ancyliformis (J.P.S. Grateloup, 1828 †) - (CAPULIDAE) (FOSSIL)
- ancyliformis, Plesiothyreus ancyliformis (J.P.S. Grateloup, 1828 †) - (PHENACOLEPADIDAE) (FOSSIL)
- ancyliformis, Gundlachia ancyliformis L. Pfeiffer, 1850 - syn of: Gundlachia radiata (L. Guilding, 1828) - (PLANORBIDAE)
- Ancylina, Genus Ancylina Bandel & Riedel, 1994 (PLANORBIDAE) (FOSSIL)
- Ancyloceras, Genus Ancyloceras D'Orbigny , 1842 † (ANCYLOCERATIDAE) (FOSSIL)
- ANCYLOCERATIDAE Gill, 1871 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-ANCYLOCERATINA [Suborder]-ANCYLOCERATOIDEA [Superfamily]) (FOSSIL)
- ancylochila, Dimorphosoma ancylochila J. Gardner, 1875 † - (APORRHAIDAE) (FOSSIL)
- Ancylodoris, syn of: Genus Onchidoris H.M.D. De Blainville, 1816 (ONCHIDORIDIDAE)
- ancyloides, Propilidium ancyloides E. Forbes, 1840 - syn of: Propilidium exiguum (W. Thompson, 1844) - (LEPETIDAE)
- ancyloides, Patella ancyloides E. Forbes, 1840 - syn of: Propilidium exiguum (W. Thompson, 1844) - (PATELLIDAE)
- ancylostoma chiapensis, Planorbis ancylostoma chiapensis P.H. Fischer & J.C.H. Crosse, 1886 - syn of: Helisoma foveale (K.T. Menke, 1830) - (PLANORBIDAE)
- ancylostomus, Planorbis ancylostomus J.C.H. Crosse & P.H. Fischer, 1879 - syn of: Helisoma foveale (K.T. Menke, 1830) - (PLANORBIDAE)
- Ancylotropaeum, Genus Ancylotropaeum Casey, 1980 † (ANCYLOCERATIDAE) (FOSSIL)
- Ancylotus, syn of: Genus Anculosa T. Say, 1821 (PLEUROCERIDAE)
- ancylus, Conus ancylus W.P. Woodring, 1928 † - (CONIDAE) (FOSSIL)
- Ancylus, Genus Ancylus O.F. Müller, 1774 (PLANORBIDAE)
- ancyrensis haussknechti, Helix ancyrensis haussknechti W. Kobelt, 1906 - syn of: Helix lucorum C. Linnaeus, 1758 - (HELICIDAE)
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