- Arjamannia, Genus Arjamannia Peel, 1975 (LOPHOSPIRIDAE) (FOSSIL)
- arjanbosi, Neolepton arjanbosi J. van der Linden, 2003 - (NEOLEPTONIDAE)
- arjani, Globiscala arjani B. Kokshoorn & J. Goud, 2007 - (EPITONIIDAE)
- arkanasanum, Nostoceras arkanasanum J. Kennedy & Cobban, 1993 † - (NOSTOCERATIDAE) (FOSSIL)
- Arkanites, Genus Arkanites McCaleb & al., 1964 (RETICULOCERATIDAE) (FOSSIL)
- arkansana, Platyzona arkansana (Girty, 1915 †) - (GONIASMATIDAE) (FOSSIL)
- arkansana, Myalina arkansana Weller, 1897 † - syn of: Promytilus illinoisensis (A.H. Worthen, 1884 †) - (MYALINIDAE) (FOSSIL)
- arkansana, Sulcatopinna arkansana Weller, 1897 † - syn of: Sulcatopinna missouriensis (Swallow, 1863 †) - (PINNIDAE) (FOSSIL)
- arkansanum, Muensteroceras arkansanum W.J. Gordon, 1964 † - (MUENSTEROCERATIDAE) (FOSSIL)
- arkansanum, Nostoceras arkansanum Kennedy & Cobban, 1993b † - (NOSTOCERATIDAE) (FOSSIL)
- arkansanum, Aphelaeceras arkansanum W.J. Gordon, 1964 † - (TRIGONOCERATIDAE) (FOSSIL)
- arkansanus, Aviculopecten arkansanus Mather, 1915 † - syn of: Aviculopecten halensis Mather, 1915 † - (AVICULOPECTINIDAE) (FOSSIL)
- arkansanus, Pachydiscus arkansanus (L.W. Stephenson, 1941 †) - (DESMOCERATIDAE) (FOSSIL)
- arkansasense, Protocycloceras arkansasense Ulrich & al., 1944 † - (PROTOCYCLOCERATIDAE) (FOSSIL)
- arkansasensis, Stenopronorites arkansasensis Smith, 1896 † - syn of: Pseudopronorites arkansiensis (Smith, 1896 †) - (PRONORITIDAE) (FOSSIL)
- arkansasensis, Pronorites arkansasensis Smith, 1896 † - syn of: Pseudopronorites arkansiensis (Smith, 1896 †) - (PRONORITIDAE) (FOSSIL)
- arkansasensis, Obovaria arkansasensis (I. Lea, 1862) - (UNIONIDAE)
- arkansensis, Pseudonerinea arkansensis Stanton, 1947 † - (CERITELLIDAE) (FOSSIL)
- arkansensis, Anculosa arkansensis A. Hinkley, 1915 - (PLEUROCERIDAE)
- arkansensis, Anodonta arkansensis I. Lea, 1852 - syn of: Strophitus undulatus (T. Say, 1817) - (UNIONIDAE)
- Arkansia, Genus Arkansia A.E. Ortmann & B. Walker, 1912 (UNIONIDAE)
- arkansiensis, Pseudopronorites arkansiensis (Smith, 1896 †) - (PRONORITIDAE) (FOSSIL)
- arkelli, Protacanthoceras arkelli Wright & J. Kennedy, 1980 † - (ACANTHOCERATIDAE) (FOSSIL)
- arkelli, Arcaspidoceras arkelli Jeannet, 1951 † - (ASPIDOCERATIDAE) (FOSSIL)
- arkelli, Mesoglauconia arkelli Mennessier, 1984 † - (CASSIOPIDAE) (FOSSIL)
- arkelli, Cuneocorbula arkelli Casey † - (CORBULIDAE) (FOSSIL)
- arkelli, Crioceratites arkelli (Sarkar, 1955 †) - (CRIOCERATITIDAE) (FOSSIL)
- arkelli, Pleydellia arkelli Maubeuge, 1950 † - (HILDOCERATIDAE) (FOSSIL)
- arkelli, Iranognomon arkelli Repin, 2008 † - (MALLEIDAE) (FOSSIL)
- arkelli, Franchia arkelli Sturani, 1967 † - (PERISPHINCTIDAE) (FOSSIL)
- arkelli, Gracilisphinctes arkelli (M. Collignon, 1958 †) - (PERISPHINCTIDAE) (FOSSIL)
- arkelli, Parachoffatia arkelli C. Mangold, 1970 † - (PERISPHINCTIDAE) (FOSSIL)
- arkelli, Viviparus arkelli F.A. Roemer † - (VIVIPARIDAE) (FOSSIL)
- arkelli verrucosum, Protacanthoceras arkelli verrucosum Wright & J. Kennedy, 1980 † - (ACANTHOCERATIDAE) (FOSSIL)
- Arkellites, Genus Arkellites Cope, 1967 (CEPHALOPODA (unassigned)) (FOSSIL)
- arkhangelskii, Belemnella arkhangelskii W. Voigt, 1967 † - (BELEMNITIDA (unassigned)) (FOSSIL)
- arkhipovi, Karangatites arkhipovi Dagys & Ermakova, 1984 † - (MEEKOCERATIDAE) (FOSSIL)
- Arkoceras, Genus Arkoceras Ulrich & al., 1942 (TROCHOLITIDAE) (FOSSIL)
- arkonense, Arkonoceras arkonense Flower, 1945 † - (MICHELINOCERATIDAE) (FOSSIL)
- arkonense, Spinyplatyceras arkonense (Shimer & A.W. Grabau, 1902 †) - (PLATYCERATIDAE) (FOSSIL)
- arkonense, Tornoceras arkonense House, 1965 † - (TORNOCERATIDAE) (FOSSIL)
- Arkonoceras, Genus Arkonoceras Flower, 1945 (MICHELINOCERATIDAE) (FOSSIL)
- arktowskiana, Vanikoropsis arktowskiana R.O. Wilckens, 1910 † - (VANIKORIDAE) (FOSSIL)
- arlequin, Cinysca arlequin F. Rubio & E. Rolán, 2002 - (ARENEIDAE)
- arlequina, Mauritia arlequina O.A.L. Mörch, 1852 - syn of: Mauritia histrio (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- arlettae, Cypraeorbis arlettae L. Dolin, 1991 † - (CYPRAEIDAE) (FOSSIL)
- arleyi, Melanella arleyi J. Espinosa, J.A. Ortea & J. Magaña, 2001 - (EULIMIDAE)
- armadilla, Onchidella armadilla (O.A.L. Mörch, 1863) - (ONCHIDIIDAE)
- armadilla, Peronia armadilla O.A.L. Mörch, 1863 - syn of: Onchidella armadilla (O.A.L. Mörch, 1863) - (ONCHIDIIDAE)
- armadillo, Graphiconus armadillo (T. Shikama, 1971) - (CONIDAE)
- armadillo, Graphiconus armadillo T. Shikama, 1971 - syn of: Graphiconus armadillo (T. Shikama, 1971) - (CONIDAE)
- armadillo gabryae, Conus armadillo gabryae L. Raybaudi Massilia, 1989 - syn of: Graphiconus australis (H.S. Holten, 1802) - (CONIDAE)
- armaillatus, Antillophos armaillatus K. Fraussen & G.T. Poppe, 2005 - syn of: Antillophos armillatus K. Fraussen & G.T. Poppe, 2005 - (NASSARIIDAE)
- Armanda, Genus Armanda W. Macnae, 1954 (FACELINIDAE)
- armandi, Napaeus armandi C.M.F. Ancey, 1882 - (ENIDAE)
- armandi major, Napaeus armandi major C.M.F. Ancey, 1882 - (ENIDAE)
- Armandia, syn of: Genus Armandiella C.M.F. Ancey, 1901 (BRADYBAENIDAE)
- Armandiella, Genus Armandiella C.M.F. Ancey, 1901 (BRADYBAENIDAE)
- armandina, Cypraea armandina V.L.V. Potiez & A. Michaud, 1838 - syn of: Niveria suffusa (J.E. Gray, 1827) - (CYPRAEIDAE)
- armandoi, Turbonilla armandoi A. Peñas & E. Rolán, 2010 - (PYRAMIDELLIDAE)
- armaniacensis, Stagnicola armaniacensis (Noulet, 1857 †) - (LYMNAEIDAE) (FOSSIL)
- armaniacensis glabraeformis, Stagnicola armaniacensis glabraeformis (F. Gottschick, 1911 †) - (LYMNAEIDAE) (FOSSIL)
- armaniacensis palustriformis, Stagnicola armaniacensis palustriformis (F. Gottschick, 1911 †) - (LYMNAEIDAE) (FOSSIL)
- armasi, Coryda armasi H. Sarasúa, 1972 - (CEPOLIDAE)
- armasi, Annularisca armasi (M.L. Jaume, 1984) - (POMATIIDAE)
- armata, Acanthochitona armata (W.H. Pease, 1872) - (ACANTHOCHITONIDAE)
- armata, Auriculella armata (J.W. Mighels, 1845) - (ACHATINELLIDAE)
- armata, Dicroloma armata (P. Morris & J. Lycett, 1851 †) - (APORRHAIDAE) (FOSSIL)
- armata, Alaria armata P. Morris & J. Lycett, 1851 † - syn of: Dicroloma armata (P. Morris & J. Lycett, 1851 †) - (APORRHAIDAE) (FOSSIL)
- armata, Agardhiella parreyssii armata (S. Clessin, 1887) - (ARGNIDAE)
- armata, Borsonia armata O. Böttger, 1895 - (BORSONIIDAE)
- armata, Zemacies armata A.W.B. Powell, 1942 † - (BORSONIIDAE) (FOSSIL)
- armata, Pollia armata G.S. Coen, 1933 - syn of: Pollia dorbignyi (B.C.M. Payraudeau, 1826) - (BUCCINIDAE)
- Armata, syn of: Subgenus Caecum (Brochina) Gray, 1837 (CAECIDAE) (FOSSIL)
- armata, Tectaria armata A. Issel, 1869 - syn of: Perrinia stellata A. Adams, 1864 - (CHILODONTIDAE)
- armata, Ceratodoris armata C.N.E. Eliot, 1913 - (CHROMODORIDIDAE)
- armata, Medora armata (H.C. Küster, 1847) - (CLAUSILIIDAE)
- armata, Galiteuthis armata L.M.A.O.E. Joubin, 1898 - (CRANCHIIDAE)
- armata, Taringa armata C.K. Swennen, 1961 - (DISCODORIDIDAE)
- armata, Nophodoris armata Á. Valdés & T.M. Gosliner, 2001 - (DISCODORIDIDAE)
- armata, Hoplodoris armata (K. Baba, 1993) - (DISCODORIDIDAE)
- armata, Carminodoris armata K. Baba, 1993 - syn of: Hoplodoris armata (K. Baba, 1993) - (DISCODORIDIDAE)
- armata, Splendrillia armata A.W.B. Powell, 1942 - (DRILLIIDAE)
- armata, Abralia armata (J.R.C. Quoy & J.P. Gaimard, 1832) - (ENOPLOTEUTHIDAE)
- armata, Cycloscala armata E.F. Garcia, 2004 - (EPITONIIDAE)
- armata, Anetarca armata T.M. Gosliner, 1991 - (FACELINIDAE)
- armata, Amanda armata W. Macnae, 1954 - (FACELINIDAE)
- armata, Hemipolygona armata (Adams, 1855) - (FASCIOLARIIDAE)
- armata, Monachoides armata J.F. Mabille, 1859 - syn of: Perforatella incarnata (O.F. Müller, 1774) - (HYGROMIIDAE)
- armata, Bathyliotina armata (C.B. Adams, 1861) - (LIOTIIDAE)
- armata, Eunema armata G.A. Goldfuss, 1832 † - syn of: Pseudoplagiothyra armatus (G.A. Goldfuss, 1832 †) - (LOPHOSPIRIDAE) (FOSSIL)
- armata, Gyronema armata G.A. Goldfuss, 1832 † - syn of: Pseudoplagiothyra armatus (G.A. Goldfuss, 1832 †) - (LOPHOSPIRIDAE) (FOSSIL)
- armata, Melanopsis armata Matheron, 1842 † - (MELANOPSIDAE) (FOSSIL)
- armata, Goniospira armata (Münster, 1841 †) - (MURCHISONIIDAE) (FOSSIL)
- armata, Pseudocominella armata (Sowerby & G. Dixon, 1850 †) - (NASSARIIDAE) (FOSSIL)
- armata, Bullia armata J.E. Gray, 1839 - syn of: Buccinanops monilifer (L.C. Kiener, 1834) - (NASSARIIDAE)
- armata, Cassianopsis armata (Münster, 1841 †) - (NERITOPSIDAE) (FOSSIL)
- armata, Acanthodoris armata O'Donoghue, 1927 - (ONCHIDORIDIDAE)
- armata, Paracrostoma armata (R.A.M. Brandt, 1968) - (PACHYCHILIDAE)
- armata, Naticella armata Münster, 1841 † - syn of: Cassianopsis armata (Münster, 1841 †) - (PLANAXIDAE) (FOSSIL)
- armata, Pleurotomaria armata Münster, 1844 † - (PLEUROTOMARIIDAE) (FOSSIL)
- armata, Parachondria armata (C.B. Adams, 1849) - (POMATIIDAE)
- armata, Purpurina armata Tate, 1875 † - (PURPURINIDAE) (FOSSIL)
- armata, Odostomia armata P.P. Carpenter, 1857 - (PYRAMIDELLIDAE)
- armata, Lotoria armata (G.B. III Sowerby, 1897) - (RANELLIDAE)
- armata, Sassia armata (L.H. Hupé, 1854 †) - (RANELLIDAE) (FOSSIL)
- armata, Callusaria armata (J. Marwick, 1924 †) - (STRUTHIOLARIIDAE) (FOSSIL)
- armata, Tellina armata G.B. II Sowerby, 1868 - (TELLINIDAE)
- armata, Potadomoides armata Musalizi, 2017 † - (THIARIDAE) (FOSSIL)
- armata, Tubina armata Owen, 1859 † - (TUBINIDAE) (FOSSIL)
- armata, Turritella armata Münster, 1841 † - syn of: Goniospira armata (Münster, 1841 †) - (TURRITELLIDAE) (FOSSIL)
- armata, Melo armata J.B.P.A. Lamarck, 1811 - syn of: Melo amphora (J. Lightfoot, 1786) - (VOLUTIDAE)
- armathia, Albinaria olivieri armathia (O. Böttger, 1889) - (CLAUSILIIDAE)
- Armatites, Genus Armatites Becker, 1993 (TORNOCERATIDAE) (FOSSIL)
- armatocingulatus, Ammonites armatocingulatus Klipstein, 1843 † - (AMMONITIDA (unassigned)) (FOSSIL)
- armatum, Pseudaspidoceras armatum Pervinquiére, 1907 † - (ACANTHOCERATIDAE) (FOSSIL)
- armatum, Anisoceras armatum (Sowerby, 1817 †) - (ANISOCERATIDAE) (FOSSIL)
- armatum, Buccinum armatum W. Wood, 1828 - syn of: Mexacanthina lugubris (J. de C. Sowerby, 1821) - (BUCCINIDAE)
- armatum, Rossiceras armatum (Münster, 1841 †) - (CERATITIDAE) (FOSSIL)
- armatum, Cerithium armatum G.A. Goldfuss, 1843 † - syn of: Cryptaulax armatum (G.A. Goldfuss, 1843 †) - (CERITHIIDAE) (FOSSIL)
- armatum, Cerithium lifuense armatum R.A. Philippi, 1848 - (CERITHIIDAE)
- armatum, Ascaulocardium armatum (Morton, 1833 †) - (CLAVAGELLIDAE) (FOSSIL)
- armatum, Conocardium armatum (B. Phillips, 1836 †) - (CONOCARDIIDAE) (FOSSIL)
- armatum, Cryptaulax armatum (G.A. Goldfuss, 1843 †) - (CRYPTAULACIDAE) (FOSSIL)
- armatum, Eoderoceras armatum Sowerby, 1815 † - (EODEROCERATIDAE) (FOSSIL)
- armatum, Hamites armatum Sowerby † - (HAMITIDAE) (FOSSIL)
- armatum, Furloceras armatum (Merla, 1932 †) - (PHYMATOCERATIDAE) (FOSSIL)
- armatum, Cymatium armatum G.B. III Sowerby, 1897 - syn of: Lotoria armata (G.B. III Sowerby, 1897) - (RANELLIDAE)
- armatum, Vasum armatum (W.J. Broderip, 1833) - (TURBINELLIDAE)
- armatum lifuensis, Cerithium armatum lifuensis R.A. Philippi, 1848 - syn of: Cerithium lifuense armatum R.A. Philippi, 1848 - (CERITHIIDAE)
- armatum lifuensis, Cerithium armatum lifuensis J.C. Melvill & R. Standen, 1895 - syn of: Cerithium lifuense J.C. Melvill & R. Standen, 1895 - (CERITHIIDAE)
- armatum muensteri, Rossiceras armatum muensteri (R.A. Philippi, 1901 †) - (CERATITIDAE) (FOSSIL)
- armatus, Pseudaspidoceras armatus Pervinquière, 1907 † - syn of: Kamerunoceras turoniense (A.V.M.D. D'Orbigny, 1850 †) - (ACANTHOCERATIDAE) (FOSSIL)
- armatus, Notarchus punctatus armatus K. Baba, 1938 - (APLYSIIDAE)
- armatus, Bulimus armatus J.W. Mighels - syn of: Auriculella auricula (A.E.J. Férussac, 1821) - (BULIMULIDAE)
- armatus, Celtites armatus L. Waagen, 1895 † - syn of: Kashmirites armatus (L. Waagen, 1895 †) - (CELTITIDAE) (FOSSIL)
- armatus, Conus armatus E.A. Smith, 1891 - syn of: Puncticulis arenatus (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- armatus, Kitikamispira armatus G.A. Goldfuss, 1832 † - syn of: Pseudoplagiothyra armatus (G.A. Goldfuss, 1832 †) - (EUOMPHALOIDEA (unassigned)) (FOSSIL)
- armatus, Latirus armatus A. Adams, 1855 - syn of: Hemipolygona armata (Adams, 1855) - (FASCIOLARIIDAE)
- armatus, Goniatites armatus Münster, 1841 † - syn of: Rossiceras armatum (Münster, 1841 †) - (GONIATITIDAE) (FOSSIL)
- armatus, Euhoplites armatus (Spath 1925 †) - (HOPLITIDAE) (FOSSIL)
- armatus, Murexsul armatus (C.B. Adams, 1854) - (MURICIDAE)
- armatus, Babelomurex armatus (G.B. III Sowerby, 1912) - (MURICIDAE)
- armatus, Pseudoplagiothyra armatus (G.A. Goldfuss, 1832 †) - (NATICOPSIDAE) (FOSSIL)
- armatus, Zemistephanus armatus Arkell, 1954 † - (OTOITIDAE) (FOSSIL)
- armatus, Kashmirites armatus (L. Waagen, 1895 †) - (PRIONITIDAE) (FOSSIL)
- armatus, Prionites armatus Welter, 1922 † - syn of: Prionites tuberculatus L. Waagen, 1895 † - (PRIONITIDAE) (FOSSIL)
- armatus, Pseudoscalites armatus (Stoppani, 1857 †) - (PURPURINIDAE) (FOSSIL)
- armatus, Charonia armatus R. Tate, 1888 † - syn of: Sassia tatei A.G. Beu, 2010 † - (RANELLIDAE) (FOSSIL)
- armatus, Tenagodus armatus (T. Habe & S. Kosuge, 1967) - (SILIQUARIIDAE)
- armatus, Spondylus armatus G.B. II Sowerby, 1847 - syn of: Spondylus victoriae Sowerby, 1843 - (SPONDYLIDAE)
- armatus, Jujubinus armatus B.M. Landau, L. Ceulemans & F. Van Dingenen, 2016 † - (TROCHIDAE) (FOSSIL)
- armatus, Trochus armatus R.A. Philippi, 1849 - syn of: Lithopoma phoebium (P.F. Röding, 1798) - (TROCHIDAE)
- armatus, Tropites armatus Smith, 1904 † - syn of: Tropites dilleri Smith, 1904 † - (TROPITIDAE) (FOSSIL)
- armatus, Turbo armatus L.W. Dillwyn, 1817 - syn of: Bolma rugosus (C. Linnaeus, 1767) - (TURBINIDAE)
- Armatus, Genus Armatus A.N. Golikov, 1986 (TURRITELLIDAE)
- armenia, Ancylus armenia O. Böttger, 1881 - (PLANORBIDAE)
- armeniaca, Pomacea armeniaca (L.H. Hupé, 1857) - (AMPULLARIIDAE)
- Armeniaca, syn of: Genus Armenica O. Bφttger, 1877 (CLAUSILIIDAE)
- armeniaca, Dendroconus medoci armeniaca (L. Bozzetti, 2009) - (CONIDAE)
- armeniaca, Umbilia armeniaca J.C. Verco, 1912 - (CYPRAEIDAE)
- armeniaca, Imparietula armeniaca (L.L.G. de Mortillet, 1854) - (ENIDAE)
- armeniaca, Chondrula armeniaca C.M.F. Ancey, 1880 - (ENIDAE)
- armeniaca, Caucasigena armeniaca (L. Pfeiffer, 1846) - (HYGROMIIDAE)
- armeniaca, Coralliophila armeniaca A. D'Attilio & B.W. Myers, 1984 - syn of: Coralliophila abnormis (E.A. Smith, 1878) - (MURICIDAE)
- armeniaca, Pupilla armeniaca A. Issel, 1865 - syn of: Primipupilla signata (A. Mousson, 1873) - (PUPILLIDAE)
- armeniaca, Trigonochlamys armeniaca H.R. Simroth, 1912 - syn of: Trigonochlamys imitatrix O. Böttger, 1881 - (TRIGONOCHLAMYDIDAE)
- armeniaca andreyi, Umbilia armeniaca andreyi F.Jr. Lorenz & M. Beals, 2013 - (CYPRAEIDAE)
- armeniaca brunnea, Umbilia armeniaca brunnea J.C. Verco, 1912 - (CYPRAEIDAE)
- armeniaca clarksoni, Umbilia armeniaca clarksoni F.Jr. Lorenz & M. Beals, 2013 - (CYPRAEIDAE)
- armeniaca diprotodon, Umbilia armeniaca diprotodon F.Jr. Lorenz & M. Beals, 2013 - (CYPRAEIDAE)
- armeniaca southstralica, Umbilia armeniaca southstralica L. Raybaudi Massilia, 1980 - syn of: Umbilia armeniaca J.C. Verco, 1912 - (CYPRAEIDAE)
- armeniaca westralica, Umbilia armeniaca westralica L. Raybaudi Massilia, 1980 - (CYPRAEIDAE)
- armeniacum, Pseudotitanoceras armeniacum (H.W. Von Abich, 1878 †) - (PLEURONAUTILIDAE) (FOSSIL)
- armeniacus, Buliminus armeniacus C.M.F. Ancey, 1893 - syn of: Ljudmilena tricollis (A. Mousson, 1876) - (ENIDAE)
- armeniacus, Limax armeniacus E.C. Von Martens, 1880 - (LIMACIDAE)
- armeniacus, Limax armeniacus H.R. Simroth, 1886 - syn of: Vitrinoides monticola armeniacus (H.R. Simroth, 1886) - (LIMACIDAE)
- armeniacus, Vitrinoides monticola armeniacus (H.R. Simroth, 1886) - (LIMACIDAE)
- armeniacus, Hyrcanolestes armeniacus H.R. Simroth, 1910 - syn of: Hyrcanolestes velitaris (E.C. Von Martens, 1880) - (TRIGONOCHLAMYDIDAE)
- armeniacus, Potomida armeniacus W. Kobelt, 1912 - syn of: Potomida littoralis (G.L.C.F.D. Cuvier, 1798) - (UNIONIDAE)
- Armenica, Genus Armenica O. Bφttger, 1877 (CLAUSILIIDAE)
- armenica, Armenica disjuncta armenica H. Nordsieck, 1975 - (CLAUSILIIDAE)
- armenica, Zebrina armenica (G. Nägele, 1903) - (ENIDAE)
- armenica, Succinea armenica A. Mousson, 1880 - syn of: Succinella oblonga (J.P.R. Draparnaud, 1801) - (SUCCINEIDAE)
- armenica, Anodonta armenica Ovtschinnikov, 1935 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- armenicum, Tylostoma armenicum Hacobjan, 1976 † - (TYLOSTOMATIDAE) (FOSSIL)
- armenicus, Caspicyclotus armenicus Schütt, 1991 † - (CYCLOPHORIDAE) (FOSSIL)
- armenicus, Pachydiscus armenicus Atabekian & Akopian, 1969 † - (DESMOCERATIDAE) (FOSSIL)
- armenius, Nairites armenius Kiparisova & Azarian, 1963 † - (NORIDISCITIDAE) (FOSSIL)
- Armenoceras, Genus Armenoceras Foerste, 1924 (ARMENOCERATIDAE) (FOSSIL)
- ARMENOCERATIDAE Foerste & Teichert, 1930 - Family (CEPHALOPODA-NAUTILOIDEA-NAUTILIDA) (FOSSIL)
- Armenocerithium, Genus Armenocerithium Egoyan, 1955 (DIOZOPTYXIDAE) (FOSSIL)
- Armenostoma, Genus Armenostoma Hacobjan, 1974 (CAPULIDAE) (FOSSIL)
- Armequipecten, syn of: Genus Aequipecten P. Fischer, 1886 (PECTINIDAE)
- Armida, syn of: Genus Arctica H.C.F. Schumacher, 1817 (ARCTICIDAE)
- Armiella, Subgenus Kauaia (Armiella) A. Hyatt in H.A. Pilsbry, 1911 (AMASTRIDAE)
- armifera, Gastrocopta armifera (T. Say, 1821) - (VERTIGINIDAE)
- armiger, Conasprella armiger (J.C.H. Crosse, 1858) - (CONIDAE)
- armiger, Dalliconus armiger H.A. Rehder & R.T. Abbott, 1951 - syn of: Conasprella armiger (J.C.H. Crosse, 1858) - (CONIDAE)
- armiger, Mitra armiger L.A. Reeve, 1845 - syn of: Vexillum turriger (L.A. Reeve, 1845) - (MITRIDAE)
- Armiger, syn of: Genus Gyraulus A.E.R. Agassiz in J.G.F. de Charpentier, 1837 (PLANORBIDAE)
- armiger bajanensis, Dalliconus armiger bajanensis G.W. Nowell-Usticke, 1968 - syn of: Conasprella bajanensis (G.W. Nowell-Usticke, 1968) - (CONIDAE)
- armigera, Latirus armigera R.P. Lesson, 1842 - (FASCIOLARIIDAE)
- armigera, Cornulina armigera (T.A. Conrad, 1833 †) - (MELONGENIDAE) (FOSSIL)
- armigera, Mancinella armigera J.H.F. Link, 1807 - (MURICIDAE)
- armigera, Purpura armigera J.B.P.A. Lamarck, 1822 - syn of: Mancinella armigera J.H.F. Link, 1807 - (MURICIDAE)
- armigera, Planorbula armigera (T. Say, 1821) - (PLANORBIDAE)
- armigera, Lithasia armigera (T. Say, 1821) - (PLEUROCERIDAE)
- armigera, Vespericola armigera (C.M.F. Ancey, 1881) - (POLYGYRIDAE)
- armigera, Turbinella armigera J.B.P.A. Lamarck, 1822 - syn of: Mancinella armigera J.H.F. Link, 1807 - (TURBINELLIDAE)
- armigera, Tudicla armigera A. Adams, 1855 - syn of: Tudivasum armigerum (A. Adams, 1856) - (TURBINELLIDAE)
- armigera affinis, Mancinella armigera affinis (L.A. Reeve, 1846) - (MURICIDAE)
- armigera wheatleyi, Planorbula armigera wheatleyi H.C. Lea, 1858 - (PLANORBIDAE)
- armigerella, Gastrocopta armigerella (O.W.H. Reinhardt, 1877) - (VERTIGINIDAE)
- armigerella daitojimana, Gastrocopta armigerella daitojimana J.T. Kuroda, 1960 - (VERTIGINIDAE)
- armigerella hachijoensis, Gastrocopta armigerella hachijoensis H.A. Pilsbry, 1916 - (VERTIGINIDAE)
- armigeri, Ophiolamia armigeri A. Warén & R. Carney, 1981 - (EULIMIDAE)
- armigerum, Tudivasum armigerum (A. Adams, 1856) - (TURBINELLIDAE)
- armigerus, Ambercyclus armigerus (J. Lycett, 1863 †) - (EUCYCLIDAE) (FOSSIL)
- armigerus, Hexaplex trunculus armigerus T.A. de M. Monterosato - (MURICIDAE)
- Armigerus, Genus Armigerus S. Clessin, 1884 (PLANORBIDAE)
- armigerus fuscus, Hexaplex trunculus armigerus fuscus (E. Réquien, 1848) - (MURICIDAE)
- armilda, Fusiturricula armilda (W.H. Dall, 1908) - (DRILLIIDAE)
- armilla, Pleuromeris armilla (W.H. Dall, 1903) - (CARDITIDAE)
- armilla, Venericardia armilla W.H. Dall, 1903 - syn of: Pleuromeris armilla (W.H. Dall, 1903) - (CARDITIDAE)
- armilla, Drillia armilla K.H. Barnard, 1958 - (DRILLIIDAE)
- armilla, Trapania armilla T.M. Gosliner & S.J. Fahey, 2008 - (GONIODORIDIDAE)
- armillada, Onchidella armillada O.A.L. Mörch, 1863 - syn of: Onchidella armadilla (O.A.L. Mörch, 1863) - (ONCHIDIIDAE)
- armillata, Amastra ricei armillata C.M. Cooke, 1917 - (AMASTRIDAE)
- armillata, Pseudotorinia armillata R. Bieler, 1993 - (ARCHITECTONICIDAE)
- armillata, Engina armillata L.A. Reeve, 1848 - (BUCCINIDAE)
- armillata, Astele armillata (W. Wood, 1828) - (CALLIOSTOMATIDAE)
- armillata, Calliostoma armillata W. Wood, 1828 - syn of: Astele armillata (W. Wood, 1828) - (CALLIOSTOMATIDAE)
- armillata, Chaetopleura armillata P.P. Carpenter in H.A. Pilsbry, 1892 - syn of: Chaetopleura angulata (L. Spengler, 1797) - (CHAETOPLEURIDAE)
- armillata, Microxeromagna armillata R.T. Lowe, 1852 - syn of: Microxeromagna lowei (V.L.V. Potiez & A. Michaud, 1835) - (HYGROMIIDAE)
- armillata, Mitra armillata L.A. Reeve, 1845 - syn of: Vexillum virgo (C. Linnaeus, 1767) - (MITRIDAE)
- armillata, Sinezona armillata I. Yaron, 1983 - syn of: Sukashitrochus dorbignyi (J.V. Audouin, 1826) - (SCISSURELLIDAE)
- armillata, Terebra armillata R.B. Hinds, 1844 - (TEREBRIDAE)
- armillata, Eutriphora armillata (J.C. Verco, 1909) - (TRIPHORIDAE)
- armillata, Turridrupa armillata L.A. Reeve, 1845 - syn of: Turridrupa jubata (L.A. Reeve, 1843) - (TURRIDAE)
- armillatum, Lirobittium armillatum (P.P. Carpenter, 1864) - (CERITHIIDAE)
- armillatum, Vexillum armillatum L.A. Reeve, 1845 - syn of: Vexillum virgo (C. Linnaeus, 1767) - (COSTELLARIIDAE)
- armillatum, Pisidium armillatum (J.G.J. Kuiper, 1966) - (SPHAERIIDAE)
- armillatus, Conus armillatus C.B. Adams, 1850 - syn of: Arubaconus hieroglyphus (P.L. Duclos, 1833) - (CONIDAE)
- armillatus, Antillophos armillatus K. Fraussen & G.T. Poppe, 2005 - (NASSARIIDAE)
- armillatus, Inquisitor armillatus P. Stahlschmidt & K. Fraussen, 2014 - (PSEUDOMELATOMIDAE)
- armillatus, Fossarulus armillatus Š. Brusina, 1876 † - (RISSOOIDEA (unassigned)) (FOSSIL)
- armillatus, Sukashitrochus armillatus I. Yaron, 1983 - syn of: Sukashitrochus dorbignyi (J.V. Audouin, 1826) - (SCISSURELLIDAE)
- armillatus, Trochus armillatus W. Wood, 1828 - syn of: Astele armillata (W. Wood, 1828) - (TROCHIDAE)
- Armimiltha, Genus Armimiltha Olsson & Harbison, 1953 (LUCINIDAE) (FOSSIL)
- Armina, Genus Armina C.S. Rafinesque, 1814 (ARMINIDAE)
- armini, Laluzia armini Götz & Mitchell, 2009 † - (HIPPURITIDAE) (FOSSIL)
- ARMINIDAE Iredale & ODonoghue, 1923 - Family (GASTROPODA-HETEROBRANCHIA-OPISTHOBRANCHIA-NUDIPLEURA)
- arminiensis, Galba arminiensis (E. Jekelius, 1932 †) - (LYMNAEIDAE) (FOSSIL)
- arminiensis, Gyraulus arminiensis E. Jekelius, 1932 † - (PLANORBIDAE) (FOSSIL)
- arminiensis contractus, Gyraulus arminiensis contractus E. Jekelius, 1932 † - (PLANORBIDAE) (FOSSIL)
- arminiensis depressus, Gyraulus arminiensis depressus E. Jekelius, 1932 † - (PLANORBIDAE) (FOSSIL)
- arminus, Dermatobranchus arminus T.M. Gosliner & S.J. Fahey, 2011 - (ARMINIDAE)
- armipotens, Ludwigia armipotens (Buckman †) - (GRAPHOCERATIDAE) (FOSSIL)
- armitageana, Actinella armitageana R.T. Lowe, 1852 - (HYGROMIIDAE)
- armiti, Hunsteinia armiti (E.A. Smith, 1895) - (HELICARIONIDAE)
- Armodoris, Genus Armodoris Y.S. Minichev, 1972 (AKIODORIDIDAE)
- armonica, Eulimostraca armonica J. Espinosa & J.A. Ortea, 2007 - (EULIMIDAE)
- armonica, Volvarina armonica T. Cossignani, 1997 - (MARGINELLIDAE)
- armonica, Neocancilla armonica (T. Cossignani & V. Cossignani, 2005) - (MITRIDAE)
- armonicum, Caecum armonicum L. de Folin, 1869 - syn of: Caecum armoricum L. de Folin, 1869 - (CAECIDAE)
- armoricana, Aeolidia armoricana P. Hesse, 1872 - syn of: Tenellia adspersa (A. Nordmann, 1845) - (AEOLIDIIDAE)
- armoricana, Marstoniopsis armoricana (A. Paladilhe, 1869) - (AMNICOLIDAE)
- armoricana, Crenistriella armoricana Blodgett & al., 1999 † - (BUCANELLIDAE) (FOSSIL)
- armoricana, Pseudovestia armoricana J.R. Bourguignat, 1880 - syn of: Macrogastra rolphii (W. Turton, 1831) - (CLAUSILIIDAE)
- armoricana, Doto armoricana P. Hesse, 1872 - syn of: Doto pinnatifida (G. Montagu, 1804) - (DOTIDAE)
- armoricana, Ovatella armoricana É.A.A. Locard, 1891 - syn of: Myosotella myosotis (J.P.R. Draparnaud, 1801) - (ELLOBIIDAE)
- armoricana, Fiona armoricana P. Hesse, 1872 - syn of: Fiona pinnata (J.F. von Eschscholtz, 1831) - (FIONIDAE)
- armoricana, Cernuella armoricana Hadolsky, 1968 - syn of: Cernuella aginnica (É.A.A. Locard, 1882) - (HYGROMIIDAE)
- armoricana, Littorina armoricana É.A.A. Locard, 1886 - syn of: Littorina littorea (C. Linnaeus, 1758) - (LITTORINIDAE)
- armoricanus, Gyroceratites armoricanus Erben, 1960 † - (MIMOCERATIDAE) (FOSSIL)
- armoricanus, Palliolum armoricanus J.C. Chenu, 1843 - syn of: Palliolum tigerinum (O.F. Müller, 1776) - (PECTINIDAE)
- armoricense, Terebellum armoricense Vasseur, 1881 † - (SERAPHSIDAE) (FOSSIL)
- armoricensis, Suessionia armoricensis (Vasseur, 1881 †) - (BUCCINIDAE) (FOSSIL)
- armoricensis, Drillia armoricensis A.E.M. Cossmann, 1896 † - (DRILLIIDAE) (FOSSIL)
- armoricensis, Littorina armoricensis Vasseur, 1881 † - (LITTORINIDAE) (FOSSIL)
- armoricensis, Mytilus armoricensis Vasseur, 1881 † - (MYTILIDAE) (FOSSIL)
- armoricensis, Potamides armoricensis (Vasseur, 1881 †) - (POTAMIDIDAE) (FOSSIL)
- armoricensis, Paraseraphs armoricensis (A.E.M. Cossmann, 1897 † †) - (SERAPHSIDAE) (FOSSIL)
- armoricensis, Hastula armoricensis A.E.M. Cossmann † - (TEREBRIDAE) (FOSSIL)
- armoricensis, Marcia armoricensis (Vasseur, 1881 †) - (VENERIDAE) (FOSSIL)
- armoricensis, Vermetus armoricensis A.E.M. Cossmann, 1899 † - (VERMETIDAE) (FOSSIL)
- armoricum, Caecum armoricum L. de Folin, 1869 - (CAECIDAE)
- armoricus, Conus armoricus H.H. Suter, 1917 † - (CONIDAE) (FOSSIL)
- armoricus, Paraseraphs armoricus (Vasseur, 1882 †) - (SERAPHSIDAE) (FOSSIL)
- armorum, Gladioceras armorum T. Iredale & C.F. Laseron, 1957 - syn of: Parastrophia elegans (L. de Folin, 1880) - (CAECIDAE)
- armouri, Strophiops armouri W.J. Clench, 1933 - (CERIONIDAE)
- armouri, Chondropoma beatensis armouri W.J. Clench, 1932 - (POMATIIDAE)
- Armsia, Genus Armsia H.A. Pilsbry, 1911 (AMASTRIDAE)
- armstrongi, Lienardia armstrongi (G. Nevill & H. Nevill, 1875) - (CLATHURELLIDAE)
- armstrongi, Glyphostoma armstrongi L.G. Hertlein & A.M. Strong, 1955 - syn of: Glyphostoma neglecta (R.B. Hinds, 1843) - (CLATHURELLIDAE)
- armstrongi, Anaflemingites armstrongi Runnegar, 1969 † - (FLEMINGITIDAE) (FOSSIL)
- armstrongi, Lambeoceras armstrongi Flower, 1957 † - (GONIOCERATIDAE) (FOSSIL)
- armstrongi, Glabrocingulum armstrongi A. Thomas, 1940 † - (GOSSELETINIDAE) (FOSSIL)
- armstrongi, Neodimorphoceras armstrongi D.R. Currie, 1954 † - (NEODIMORPHOCERATIDAE) (FOSSIL)
- armudanensis, Malletia armudanensis Lautenschläger, 1968 † - (MALLETIIDAE) (FOSSIL)
- armuella, Uzita armuella A.A. Olsson, 1942 † - (NASSARIIDAE) (FOSSIL)
- arnaizi, Xerosecta arnaizi P.M. Pallary, 1936 - (HYGROMIIDAE)
- arnaldoi, Naesiotus arnaldoi (P.D. Lanzieri & H.E.B. Rezende, 1971) - (BULIMULIDAE)
- arnaldoi, Epitonium arnaldoi B. Tursch & J. Pierret, 1964 - syn of: Epitonium angulatum T. Say, 1831 - (EPITONIIDAE)
- arnaldoi, Sarasinula arnaldoi J.W. Thomé, 1967 - syn of: Sarasinula linguaeformis (C.G. Semper, 1885) - (VERONICELLIDAE)
- arnaloti, Mitra arnaloti P. Bartsch, 1918 - syn of: Nebularia chrysostoma (W.J. Broderip, 1836) - (MITRIDAE)
- arnaudi, Metengonoceras arnaudi Grossouvre, 1912 † - (ENGONOCERATIDAE) (FOSSIL)
- arnaudi, Eubranchus arnaudi N. Vicente, 1974, 1973 - (EUBRANCHIDAE)
- arnaudi, Polyschides arnaudi V. Scarabino, 1995 - (GADILIDAE)
- arnaudi, Enixotrophon arnaudi (G. Pastorino, 2002) - (MURICIDAE)
- arnaudi, Durania arnaudi (Choffat, 1891 †) - (RADIOLITIDAE) (FOSSIL)
- arnaudi, Dientomochilus arnaudi Termier, 1954 † - (RIMELLIDAE) (FOSSIL)
- arnaudi, Powellisetia arnaudi W.F. Ponder, 1983 - (RISSOIDAE)
- arnaudi, Yezoites arnaudi (Grossouvre, 1894 †) - (SCAPHITIDAE) (FOSSIL)
- arnaudi, Paradmete arnaudi H. Numanami, 1996 - (VOLUTOMITRIDAE)
- Arnaudia, Genus Arnaudia Fischer, 1887 (MONOPLEURIDAE) (FOSSIL)
- arnauticus, Arnautoceltites arnauticus (Arthaber, 1911 †) - (MELAGATHICERATIDAE) (FOSSIL)
- Arnautoceltites, Genus Arnautoceltites Diener, 1916 (MELAGATHICERATIDAE) (FOSSIL)
- arnautorum, Cochlostoma kleciaki arnautorum (A.J. Wagner, 1906) - (COCHLOSTOMATIDAE)
- arneggensis, Archaeozonites arneggensis (Miller, 1907) † - (ARCHAEOZONITIDAE) (FOSSIL)
- arneggensis, Laminifera arneggensis Miller, 1907 † - (CLAUSILIIDAE) (FOSSIL)
- arneggensis, Palaeomastus arneggensis (Miller, 1907) † - (ENIDAE) (FOSSIL)
- arneggensis, Parachloraea arneggensis (Miller, 1907 †) - (HELICIDAE) (FOSSIL)
- arneggensis, Pomatias arneggensis Wenz, 1923 † - (POMATIIDAE) (FOSSIL)
- arnemani, Achatinella bulimoides arnemani D.A. Welch, 1958 - (ACHATINELLIDAE)
- arnemanni, Partulina arnemanni C.M. Cooke & Y. Kondo, 1952 - (ACHATINELLIDAE)
- Arnemelassa, Genus Arnemelassa T. Iredale, 1933 (CAMAENIDAE)
- arnheimi, Tonicia arnheimi W.H. Dall, 1903 - (CHITONIDAE)
- arnheimi, Macoma arnheimi W.H. Dall - (TELLINIDAE)
- arnheimi, Adelomelon arnheimi J.J. Rivers, 1891 - syn of: Adelomelon ancilla (J. Lightfoot, 1786) - (VOLUTIDAE)
- arnhemense, Xanthomelon arnhemense F. Köhler & G.E. Burghardt, 2016 - (CAMAENIDAE)
- arnhemensis, Maningrida arnhemensis R.E. Golding, W.F. Ponder & M.M. Byrne, 2007 - (MANINGRIDIDAE)
- Arnhemtrachia, Genus Arnhemtrachia F. Kφhler & F. Criscione, 2013 (CAMAENIDAE)
- Arnioceltites, Genus Arnioceltites Mojsisovics, 1893 (TROPICELTITIDAE) (FOSSIL)
- Arnioceras, Genus Arnioceras Dumortier, 1867 (ARIETITIDAE) (FOSSIL)
- Arniotites, syn of: Genus Arnioceras Dumortier, 1867 (ARIETITIDAE) (FOSSIL)
- arnoensis, Polyschides arnoensis P.A. Maxwell, 1992 † - (GADILIDAE) (FOSSIL)
- arnoldeyasi, Mitra arnoldeyasi G.T. Poppe, S.P. Tagaro & R. Salisbury, 2010 - (MITRIDAE)
- arnoldi, Bayerius arnoldi (V.J. Lus, 1981) - (BUCCINIDAE)
- arnoldi, Bittium arnoldi P. Bartsch, 1911 - (CERITHIIDAE)
- arnoldi, Cerithiopsis arnoldi P. Bartsch, 1911 - (CERITHIOPSIDAE)
- arnoldi, Austromitra arnoldi (J.C. Verco, 1909) - (COSTELLARIIDAE)
- arnoldi, Corbicula arnoldi Clark 1938 † - (CYRENIDAE) (FOSSIL)
- arnoldi, Wyomingites arnoldi (A. Hyatt & Smith, 1905 †) - (DIENEROCERATIDAE) (FOSSIL)
- arnoldi, Epitonium arnoldi W.H. Dall, 1917 - (EPITONIIDAE)
- arnoldi, Fusus arnoldi A.E.M. Cossmann, 1903 - syn of: Fusinus barbarensis arnoldi A.E.M. Cossmann, 1903 - (FASCIOLARIIDAE)
- arnoldi, Fusinus barbarensis arnoldi A.E.M. Cossmann, 1903 - (FASCIOLARIIDAE)
- arnoldi, Diodora arnoldi J.H. McLean, 1966 - (FISSURELLIDAE)
- arnoldi, Gymnodoris arnoldi (R.F. Burn, 1957) - (GYMNODORIDIDAE)
- arnoldi, Laevidentalium arnoldi K.L. Lamprell & J.M. Healy, 1998 - syn of: Laevidentalium houbricki V. Scarabino, 1995 - (LAEVIDENTALIIDAE)
- arnoldi, Mitra arnoldi G.T. Poppe & S.P. Tagaro, 2010 - syn of: Mitra arnoldeyasi G.T. Poppe, S.P. Tagaro & R. Salisbury, 2010 - (MITRIDAE)
- arnoldi, Crenomytilus arnoldi (Clark, 1918 †) - (MYTILIDAE) (FOSSIL)
- arnoldi, Tritia arnoldi F.M. Anderson † - (NASSARIIDAE) (FOSSIL)
- arnoldi, Neohoploceras arnoldi (Pictet & Campiche, 1860 †) - (NEOCOMITIDAE) (FOSSIL)
- arnoldi, Ostrea arnoldi O.S. Adegoke, 1969 † - syn of: Crassostrea ashleyi L.G. Hertlein, 1943 † - (OSTREIDAE) (FOSSIL)
- arnoldi, Paralecanites arnoldi A. Hyatt & Smith, 1905 † - syn of: Wyomingites arnoldi (A. Hyatt & Smith, 1905 †) - (PARACELTITIDAE) (FOSSIL)
- arnoldi, Lyropecten arnoldi (Aguerrevere, 1925 †) - (PECTINIDAE) (FOSSIL)
- arnoldi, Raphitoma arnoldi (P.M. Pallary, 1906) - (RAPHITOMIDAE)
- arnoldi, Philbertia arnoldi P.M. Pallary, 1906 - syn of: Raphitoma arnoldi (P.M. Pallary, 1906) - (RAPHITOMIDAE)
- arnoldi, Gulella arnoldi (R. Sturany, 1898) - (STREPTAXIDAE)
- arnoldi, Solariorbis arnoldi P. Bartsch, 1927 - (TORNIDAE)
- arnoldi, Paratropites arnoldi Smith, 1927 † - syn of: Pleurotropites gabbi (Smith, 1927 †) - (TROPITIDAE) (FOSSIL)
- arnoldi, Katherinella arnoldi (C.S. Weaver, 1916 †) - (VENERIDAE) (FOSSIL)
- arnoldii, Tropidomphalus arnoldii (Thomä, 1845 †) - (ELONIDAE) (FOSSIL)
- Arnoldina, syn of: Genus Anodonta J.B.P.A. Lamarck, 1799 (UNIONIDAE)
- arnoldoi, Turbonilla arnoldoi D. De Jong & H.E. Coomans, 1988 - (PYRAMIDELLIDAE)
- arnoldoi, Runcina arnoldoi J.A. Ortea & J.J. Bacallado, 2013 - (RUNCINIDAE)
- arnoldoi, Cosmotriphora arnoldoi M.J. Faber & R.G. Moolenbeek, 1991 - (TRIPHORIDAE)
- arnotti, Microkerkus arnotti (Benson, 1864) - (UROCYCLIDAE)
- arnoudii, Corbicula arnoudii V.L.V. Potiez & A. Michaud, 1839 † - (CYRENIDAE) (FOSSIL)
- arnouldi, Arnioceras arnouldi Dumortier, 1867 † - (ARIETITIDAE) (FOSSIL)
- arnouldi, Dreissena arnouldi É.A.A. Locard, 1893 - syn of: Dreissena polymorpha (P.S. Pallas, 1771) - (DREISSENIDAE)
- arnouldi, Zebrina arnouldi P. Fagot, 1894 - syn of: Zebrina detrita (O.F. Müller, 1774) - (ENIDAE)
- arnouldi, Cernuella arnouldi P. Fagot in Marcet, 1909 - syn of: Cernuella virgata (E.M. Da Costa, 1778) - (HYGROMIIDAE)
- arnouldi, Vitrea arnouldi J. Da Silva e Castro, 1893 - syn of: Vitrea contracta (C.A. Westerlund, 1871) - (PRISTILOMATIDAE)
- Arnouldia, syn of: Genus Euconulus O.W.H. Reinhardt, 1883 (EUCONULIDAE)
- arnouldii, Varicorbula arnouldii (P. Nyst, 1843 †) - (CORBULIDAE) (FOSSIL)
- arntzenii, Conus arntzenii Martin, 1916 † - (CONIDAE) (FOSSIL)
- arntzenii, Cancilla arntzenii Martin, 1916 † - (MITRIDAE) (FOSSIL)
- arntzi, Micropilina arntzi A. Warén & S. Hain, 1992 - (NEOPILINIDAE)
- arntzi, Hyalopecten arntzi E.N. Egorova, 1999 - (PECTINIDAE)
- arnumensis, Acteon arnumensis Sorgenfrei, 1958 † - (ACTEONIDAE) (FOSSIL)
- arnzeni, Maclurites arnzeni Fix, 1975 † - syn of: Teiichispira odenvillensis (Butts, 1926 †) - (MACLURITIDAE) (FOSSIL)
- Aroa, syn of: Genus Aroapyrgus F.C. Baker, 1931 (COCHLIOPIDAE)
- aroa, Minidonta aroa F.J. Brook, 2010 - (ENDODONTIDAE)
- aroana, Anodontites aroana H.B. Baker, 1930 - (MYCETOPODIDAE)
- aroanis, Clanculus aroanis (B. de Basterot, 1825 †) - (TROCHIDAE) (FOSSIL)
- aroanus, Anodontites trapesialis aroanus H.B. Baker, 1930 - (MYCETOPODIDAE)
- Aroapyrgus, Genus Aroapyrgus F.C. Baker, 1931 (COCHLIOPIDAE)
- aroeirium, Oxytropidoceras aroeirium C.J. Maury, 1936 † - (BRANCOCERATIDAE) (FOSSIL)
- arolicus, Trimarginites arolicus (Oppel, 1862 †) - (OPPELIIDAE) (FOSSIL)
- aromatica, Volema aromatica P.F. Röding, 1798 - syn of: Volema myristica P.F. Röding, 1798 - (MELONGENIDAE)
- aronnax, Marginella aronnax P. Bouchet & A. Warén, 1985 - (MARGINELLIDAE)
- aroostooki, Orthonychia aroostooki Williams & M. Breger, 1916 † - (ORTHONYCHIIDAE) (FOSSIL)
- arorangi, Minidonta arorangi F.J. Brook, 2010 - (ENDODONTIDAE)
- Arotonaias, syn of: Genus Pachynaias J.C.H. Crosse & P. Fischer, 1894 (UNIONIDAE)
- aroussiana, Melanopsis aroussiana P.M. Pallary, 1939 - (MELANOPSIDAE)
- arowhana, Saccella arowhana J. Marwick, 1931 † - (NUCULANIDAE) (FOSSIL)
- arowhana, Odostomia arowhana J. Marwick - (PYRAMIDELLIDAE)
- Arpadites, Genus Arpadites Mojsisovics, 1879 (TRACHYCERATIDAE) (FOSSIL)
- ARPADITIDAE Hyatt, 1900 - Family (CEPHALOPODA-AMMONOIDEA-CERATITIDA) (FOSSIL)
- Arpaoceras, Genus Arpaoceras Zhuravleva, 1962 (PSEUDORTHOCERATIDAE) (FOSSIL)
- arpatschaiana, Helix arpatschaiana A. Mousson, 1873 - syn of: Harmozica pisiformis (L. Pfeiffer, 1852) - (HELICIDAE)
- arpatschaiana, Euomphalia arpatschaiana A. Mousson, 1873 - syn of: Harmozica pisiformis (L. Pfeiffer, 1852) - (HYGROMIIDAE)
- arquata, Gonioclymenia arquata G.G. Münster, 1839 † - syn of: Gonioclymenia speciosa (G.G. Münster, 1831 †) - (GONIOCLYMENIIDAE) (FOSSIL)
- arquatilis, Idas arquatilis R.K. Dell, 1995 - syn of: Adipicola arcuatilis R.K. Dell, 1995 - (MYTILIDAE)
- arquatum, Uralyroceras arquatum W. Korn & Titus, 2015 † - (NEOGLYPHIOCERATIDAE) (FOSSIL)
- arquatus, Goniatites arquatus G.G. Münster, 1839 † - syn of: Gonioclymenia speciosa (G.G. Münster, 1831 †) - (GONIATITIDAE) (FOSSIL)
- arquesi, Annularisca arquesi C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- arquilloensis, Glycymeris arquilloensis Rivera, 1957 † - (GLYCYMERIDIDAE) (FOSSIL)
- arracanense, Vexillum arracanense G.B. III Sowerby, 1874 - syn of: Pusia cithara (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- arracanensis, Mitra arracanensis G.B. III Sowerby, 1874 - syn of: Pusia cithara (L.A. Reeve, 1845) - (MITRIDAE)
- arragonites, Acanthochitona arragonites (P.P. Carpenter, 1857) - (ACANTHOCHITONIDAE)
- arragonites, Acanthochites arragonites P.P. Carpenter, 1857 - syn of: Acanthochitona arragonites (P.P. Carpenter, 1857) - (ACANTHOCHITONIDAE)
- arrakanensis, Chicoreus arrakanensis Noetling, 1895 † - (MURICIDAE) (FOSSIL)
- arrecifensis, Volvarina arrecifensis J. Espinosa, J.A. Ortea & L. Moro, 2013 - (MARGINELLIDAE)
- arrecta, Scutellastra arrecta T. Iredale, 1929 - syn of: Scutellastra flexuosa (J.R.C. Quoy & J.P. Gaimard, 1834) - (PATELLIDAE)
- arrepiata, Cornisepta arrepiata L.R.L. Simone & C.M. Cunha, 2014 - (FISSURELLIDAE)
- Arrhaphoceras, Genus Arrhaphoceras Whitehouse , 1927 (HOPLITIDAE) (FOSSIL)
- Arrhoges, Genus Arrhoges W.M. Gabb, 1868 (APORRHAIDAE)
- arrhynchus, Paramegadenus arrhynchus (A. Ivanov, 1937) - (EULIMIDAE)
- arriaca, Nerita arriaca P.F. Röding, 1798 - syn of: Nerita polita C. Linnaeus, 1758 - (NERITIDAE)
- arriacus, Obscurella arriacus J.R. Bourguignat, 1875 - syn of: Cochlostoma nouleti D. Dupuy, 1850 - (COCHLOSTOMATIDAE)
- Arribazona, Genus Arribazona Kues, 1990 (MURCHISONIIDAE) (FOSSIL)
- arridens, Actinella arridens (R.T. Lowe, 1831) - (HYGROMIIDAE)
- arriensis, Obscurella arriensis A.de Saint-Simon, 1867 - syn of: Cochlostoma nouleti D. Dupuy, 1850 - (COCHLOSTOMATIDAE)
- arrighii, Turbonilla arrighii (E. Saurin, 1959) - (PYRAMIDELLIDAE)
- arriuensis, Hortia arriuensis P. Lozouet, 1999 † - (PYRAMIMITRIDAE) (FOSSIL)
- arrogans, Platydoris arrogans L.S.R. Bergh, 1877 - syn of: Platydoris cruenta (J.R.C. Quoy & J.P. Gaimard, 1832) - (DISCODORIDIDAE)
- arronax, Marginella arronax P. Bouchet & A. Warén, 1985 - syn of: Marginella aronnax P. Bouchet & A. Warén, 1985 - (MARGINELLIDAE)
- arrondoi, Ammonicera arrondoi P.G. Oliver & E. Rolán, 2015 - (OMALOGYRIDAE)
- arrondoi, Haplocochlias arrondoi F. Rubio, R. Fernández-Garcés & E. Rolán, 2013 - (SKENEIDAE)
- arrosa, Helminthoglypta arrosa (W.G. Binney, 1858) - (HELMINTHOGLYPTIDAE)
- arrosa, Anodonta arrosa É.A.A. Locard, 1899 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- arrosa marinensis, Helminthoglypta arrosa marinensis H.A. Pilsbry, 1927 - (HELMINTHOGLYPTIDAE)
- arrosa monticola, Helminthoglypta arrosa monticola B. Roth, 1982 - (HELMINTHOGLYPTIDAE)
- arrosa pomoensis, Helminthoglypta arrosa pomoensis (W.G. Binney, 1858) - (HELMINTHOGLYPTIDAE)
- arrosa stiversiana, Helminthoglypta arrosa stiversiana J.G. Cooper, 1876 - syn of: Helminthoglypta stiversiana (J.G. Cooper, 1876) - (HELMINTHOGLYPTIDAE)
- arrosa williamsi, Helminthoglypta arrosa williamsi J.G. Cooper, 1876 - syn of: Helminthoglypta stiversiana williamsi (J.G. Cooper, 1876) - (HELMINTHOGLYPTIDAE)
- arrosis, Ostrea arrosis T.H. Aldrich, 1904 † - (OSTREIDAE) (FOSSIL)
- arrosta, Clausilia arrosta J.R. Bourguignat, 1877 - syn of: Clausilia rugosa parvula A.E.J. Férussac, 1807 - (CLAUSILIIDAE)
- arrosus, Temnodiscus arrosus (Lindström, 1884 †) - (TROPIDODISCIDAE) (FOSSIL)
- arrouana, Malletia arrouana E.A. Smith, 1885 - (MALLETIIDAE)
- arrouxi, Cernuella arrouxi (J.R. Bourguignat, 1863) - (HYGROMIIDAE)
- arrowensis, Papuina arrowensis (E.J. Le Guillou, 1842) - (CAMAENIDAE)
- arrowensis, Helix arrowensis E.J. Le Guillou, 1842 - syn of: Papuina arrowensis (E.J. Le Guillou, 1842) - (HELICIDAE)
- arrowsmithensis, Conus arrowsmithensis J.W. Brazier, 1896 - syn of: Fraterconus distans (C.H. Hwass in J.G. Bruguière, 1792) - (CONIDAE)
- arroyoensis, Medlicottia arroyoensis Plummer & P.H. Scott, 1937 † - (MEDLICOTTIIDAE) (FOSSIL)
- arroyoensis, Tejonia arroyoensis Griffin & G. Pastorino, 2013 † - (NATICIDAE) (FOSSIL)
- Arrudia, Subgenus Geomalacus (Arrudia) C. Pollonera, 1890 (ARIONIDAE)
- arruensis, Calliostoma arruensis R.B. Watson, 1880 - syn of: Calthalotia arruensis (Watson, 1880) - (CALLIOSTOMATIDAE)
- arruensis, Calthalotia arruensis (Watson, 1880) - (TROCHIDAE)
- arrugosa, Manulona arrugosa N.H. Ludbrook, 1978 † - (BATILLARIIDAE) (FOSSIL)
- 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, 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)
- 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, Volva artiaperta G. Yamakawa, 1911 - syn of: Volvulella eburnea (A. Adams, 1850) - (OVULIDAE)
- 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 R.A. Philippi, 1874 - syn of: Vexillum deshayesii (L.A. Reeve, 1844) - (MITRIDAE)
- articulata, Mitra articulata L.A. Reeve, 1845 - syn of: Pusia histrio (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)
- 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, Xerocrassa 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)
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