- obnixa, Sydaphera obnixa T. Iredale, 1929 - syn of: Sydaphera undulata (G.B. II Sowerby, 1849) - (CANCELLARIIDAE)
- obnubila, Chloritis obnubila G.P.L.K. Gude, 1907 - syn of: Ramogenia challengeri (G.P.L.K. Gude, 1906) - (CAMAENIDAE)
- obockensis, Lienardia obockensis F.P. Jousseaume, 1888 - syn of: Cronia obockensis (F.P. Jousseaume, 1888) - (CLATHURELLIDAE)
- obockensis, Scintilla obockensis F.P. Jousseaume, 1888 - syn of: Amphilepida aurantia (G.P. Deshayes, 1835) - (GALEOMMATIDAE)
- obockensis, Cronia obockensis (F.P. Jousseaume, 1888) - (MURICIDAE)
- obockensis, Phrontis obockensis F.P. Jousseaume, 1888 - syn of: Nassarius deshayesianus (A. Issel, 1866) - (NASSARIIDAE)
- obockensis, Nassa obockensis F.P. Jousseaume, 1888 - syn of: Nassarius deshayesianus (A. Issel, 1866) - (NASSARIIDAE)
- obodensis, Spelaeodiscus obodensis J. Bole, 1965 - (SPELAEODISCIDAE)
- oboesa, Ranularia oboesa (G. Perry, 1811) - (RANELLIDAE)
- oboesa retusa, Ranularia oboesa retusa J.B.P.A. Lamarck, 1822 - (RANELLIDAE)
- oboesus, Conus oboesus Michelotti, 1847 † - (CONIDAE) (FOSSIL)
- obolella, Nuculana obolella R. Tate, 1886 † - (NUCULANIDAE) (FOSSIL)
- obolinus, Parisculites obolinus (Dittmar, 1886 †) - (EPISCULITIDAE) (FOSSIL)
- obolinus, Tornquistites obolinus Dittmar, 1886 † - syn of: Parisculites obolinus (Dittmar, 1886 †) - (TROPICELTITIDAE) (FOSSIL)
- oboloidea, Palaearca oboloidea Hicks, 1873 † - syn of: Cyrtodonta oboloidea (Hicks, 1873 †) - (BIVALVIA INCERTAE SEDIS) (FOSSIL)
- oboloidea, Cyrtodonta oboloidea (Hicks, 1873 †) - (CYRTODONTIDAE) (FOSSIL)
- oboloides, Giraliapecten oboloides Darragh & Kendrick 199 † - (PECTINIDAE) (FOSSIL)
- obolos, Pseudomalaxis obolos (K.H. Barnard, 1963) - (ARCHITECTONICIDAE)
- obolus, Architectonica obolus J.F. Bayan, 1873 † - (ARCHITECTONICIDAE) (FOSSIL)
- Obornella, Genus Obornella Cox, 1959 † (PLEUROTOMARIIDAE) (FOSSIL)
- obornense, Cerithium obornense W.H. Hudleston, 1889 † - (CERITHIIDAE) (FOSSIL)
- obornensis, Ambercyclus obornensis (Hudleston, 1892 †) - (EUCYCLIDAE) (FOSSIL)
- obornensis, Pleurotomaria obornensis Hudleston † - (PLEUROTOMARIIDAE) (FOSSIL)
- oborni, Hemisurcula oborni (J. Marwick, 1960 †) - (CLAVATULIDAE) (FOSSIL)
- oborni, Rugobela oborni J. Marwick, 1960 † - (MURICIDAE) (FOSSIL)
- obova, Glycymeris latiradiata obova Baldi, 1962 † - (GLYCYMERIDIDAE) (FOSSIL)
- obovale, Apiocardia obovale (Sowerby, 1833) - (CARDIIDAE)
- obovalis, Abra obovalis Wood, 1840 † - (SEMELIDAE) (FOSSIL)
- Obovalis, Subgenus Pseudodon (Obovalis) Simpson, 1900 (UNIONIDAE)
- Obovaria, Genus Obovaria C.S. Rafinesque, 1819 (UNIONIDAE)
- obovata, Ancilla obovata A. von Koenen, 1889 † - (ANCILLARIIDAE) (FOSSIL)
- obovata, Astarte obovata Sowerby, 1822 † - (ASTARTIDAE) (FOSSIL)
- obovata, Chilina obovata (A.A. Gould, 1847) - (CHILINIDAE)
- obovata, Edmondia obovata Etheridge, 1872 † - syn of: Pyramus concentricus (Etheridge, 1872 †) - (EDMONDIIDAE) (FOSSIL)
- obovata, Emarginula obovata A. Adams, 1852 - (FISSURELLIDAE)
- obovata, Glycymeris obovata J.B.P.A. Lamarck, 1819 † - (GLYCYMERIDIDAE) (FOSSIL)
- obovata, Cardiomorpha obovata Hoare, 1993 † - (GRAMMYSIIDAE) (FOSSIL)
- obovata, Atys obovata K.T. Menke, 1854 - syn of: Atys naucum (C. Linnaeus, 1758) - (HAMINOEIDAE)
- obovata, Lyonsia obovata A. von Koenen, 1868 † - (LYONSIIDAE) (FOSSIL)
- obovata, Lithasia obovata (T. Say, 1829) - (PLEUROCERIDAE)
- obovata, Gulella obovata (L. Pfeiffer, 1855) - (STREPTAXIDAE)
- obovata, Melania obovata Münster, 1841 † - (THIARIDAE) (FOSSIL)
- obovata baldii, Glycymeris obovata baldii M. Glibert & L. van de Poel, 1965 † - (GLYCYMERIDIDAE) (FOSSIL)
- obovata ringelei, Glycymeris obovata ringelei Moerdijk & F.A.D. van Nieulande, 2000 † - (GLYCYMERIDIDAE) (FOSSIL)
- obovatum, Ancyloceras obovatum A. von Koenen, 1902 † - (ANCYLOCERATIDAE) (FOSSIL)
- obovatum, Gomphoceras obovatum Sowerby, 1839 † - (DIESTOCERATIDAE) (FOSSIL)
- obovatus, Permophorus obovatus C.O. Waterhouse, 1979 † - (KALENTERIDAE) (FOSSIL)
- obradovici, Micromelania obradovici Š. Brusina, 1902 † - (HYDROBIIDAE) (FOSSIL)
- obralete, Neptunea lyrata obralete A.N. Golikov, 1962 - (BUCCINIDAE)
- obrieni, Calycoceras obrieni A.T. Young, 1957 † - syn of: Calycoceras naviculare (Mantell, 1822 †) - (ACANTHOCERATIDAE) (FOSSIL)
- Obrimia, Genus Obrimia Bradshaw, 1991 † (PHOLADOMYOIDEA (UNASSIGNED)) (FOSSIL)
- Obrovia, syn of: Genus Hydrobia J.D.W. Hartmann, 1821 (HYDROBIIDAE)
- obrucevi, Pterosirenites obrucevi (Bajarunas, 1932 †) - (TRACHYCERATIDAE) (FOSSIL)
- obruchevi, Halobia obruchevi Kiparisova, 1937 † - (HALOBIIDAE) (FOSSIL)
- obruptus, Eonovitatus obruptus (Meshkova, 1974 †) - (ALLATHECIDAE) (FOSSIL)
- Obrussa, syn of: Genus Obrussena T. Iredale, 1930 (ACTEONIDAE)
- obrussa, Fossaria obrussa (T. Say, 1825) - (LYMNAEIDAE)
- obrussa modicella, Galba obrussa modicella T. Say, 1825 - syn of: Galba modicella (T. Say, 1825) - (LYMNAEIDAE)
- Obrussena, Genus Obrussena T. Iredale, 1930 (ACTEONIDAE)
- obruta, Astarte obruta T.A. Conrad, 1834 † - (ASTARTIDAE) (FOSSIL)
- obruta, Falsicolus obruta Finlay, 1930 † - (FASCIOLARIIDAE) (FOSSIL)
- obruta, Moreletina obruta (P.M.A. Morelet, 1860) - (HYGROMIIDAE)
- obruta, Moerella obruta T.A. Conrad † - (TELLINIDAE) (FOSSIL)
- obruta, Turritella obruta T.A. Conrad, 1833 † - (TURRITELLIDAE) (FOSSIL)
- obrutchevi, Caspiohydrobia obrutchevi Y.I. Starobogatov & S.I. Andreeva, 1981 - (HYDROBIIDAE)
- Obrutchevites, Genus Obrutchevites Vavilov, 1977 † (CERATITIDA (UNASSIGNED)) (FOSSIL)
- obrutschewi, Pupinidius obrutschewi (O.F. von Möllendorff, 1901) - (ENIDAE)
- obrutschewi contractus, Pupinidius obrutschewi contractus (O.F. von Möllendorff, 1901) - (ENIDAE)
- obrutschewi eurystoma, Pupinidius obrutschewi eurystoma (O.F. von Möllendorff, 1901) - (ENIDAE)
- obsconica, Gibbula obsconica (Wood, 1842 †) - (TROCHIDAE) (FOSSIL)
- obscura, Achatinella obscura W. Newcomb - syn of: Amastra moesta obscura (W. Newcomb, 1854) - (ACHATINELLIDAE)
- obscura, Amastra moesta obscura (W. Newcomb, 1854) - (AMASTRIDAE)
- obscura, Imoella obscura Hoare & al., 1989 † - (AVICULOPECTINIDAE) (FOSSIL)
- obscura, Bohaispira obscura Youlou, 1978 † - (BOHAISPIRIDAE) (FOSSIL)
- obscura, Enginella leucozona obscura (F.J. Cantraine, 1835) - (BUCCINIDAE)
- obscura, Cantharus pictus obscura unknown - (BUCCINIDAE)
- obscura, Semicassis obscura T. Habe, 1961 - syn of: Semicassis bulla T. Habe, 1961 - (CASSIDAE)
- obscura, Semicassis bulla obscura J.T. Kuroda, 1962 - (CASSIDAE)
- obscura, Strophiops obscura C.J. Maynard, 1896 - (CERIONIDAE)
- obscura, Prolixodens obscura (A. Cecalupo & I. Perugia, 2012) - (CERITHIOPSIDAE)
- obscura, Marshallopsis obscura A. Cecalupo & I. Perugia, 2012 - syn of: Prolixodens obscura (A. Cecalupo & I. Perugia, 2012) - (CERITHIOPSIDAE)
- obscura, Hypselodoris obscura (W. Stimpson, 1855) - (CHROMODORIDIDAE)
- obscura, Clausilia obscura A. Moquin-Tandon, 1856 - syn of: Clausilia bidentata (H. Strøm, 1765) - (CLAUSILIIDAE)
- Obscura, syn of: Subgenus Cochlostoma (Obscurella) S. Clessin, 1889 (COCHLOSTOMATIDAE)
- obscura, Colubraria obscura (L.A. Reeve, 1844) - (COLUBRARIIDAE)
- obscura, Pyrene obscura (G.B. II Sowerby, 1844) - (COLUMBELLIDAE)
- obscura, Columbella obscura G.B. II Sowerby, 1844 - syn of: Pyrene obscura (G.B. II Sowerby, 1844) - (COLUMBELLIDAE)
- obscura, Corambe obscura (A.E. Verrill, 1870) - (CORAMBIDAE)
- obscura, Corbulomima obscura (Sowerby, 1821 †) - (CORBULIDAE) (FOSSIL)
- obscura, Eucrassatella obscura A. Adams, 1854 - syn of: Nipponocrassatella japonica (R.W. Dunker, 1882) - (CRASSATELLIDAE)
- obscura, Crassatella obscura A. Adams, 1854 - syn of: Nipponocrassatella japonica (R.W. Dunker, 1882) - (CRASSATELLIDAE)
- obscura, Cylichna obscura E.R. Sykes, 1903 - (CYLICHNIDAE)
- obscura, Erronea obscura R.C. Rossiter, 1882 - syn of: Erronea caurica (C. Linnaeus, 1758) - (CYPRAEIDAE)
- obscura, Polymesoda obscura (T. Prime, 1860) - (CYRENIDAE)
- obscura, Corbicula obscura T. Prime, 1860 - syn of: Polymesoda obscura (T. Prime, 1860) - (CYRENIDAE)
- obscura, Dendrodoris obscura F.D. Abraham, 1877 - syn of: Dendrodoris limbata (G.L.C.F.D. Cuvier, 1804) - (DENDRODORIDIDAE)
- obscura, Doto obscura C.N.E. Eliot, 1906 - (DOTIDAE)
- obscura, Splendrillia obscura A.V. Sysoev, 1990 - (DRILLIIDAE)
- obscura, Philalanka obscura J.J. Vermeulen, T.S. Liew & M. Schilthuizen, 2015 - (ENDODONTIDAE)
- obscura, Merdigera obscura (O.F. Müller, 1774) - (ENIDAE)
- obscura, Dalejeconcha obscura Frýda, 1998 † - (EOGASTROPODA (UNASSIGNED)) (FOSSIL)
- obscura, Phidiana obscura (J.J. Risbec, 1928) - (FACELINIDAE)
- obscura, Graphidula obscura (B. Wade, 1926 †) - (FASCIOLARIIDAE) (FOSSIL)
- obscura, Fissurella obscura G.B. I Sowerby, 1834 - (FISSURELLIDAE)
- obscura, Goniodoris obscura W. Stimpson, 1855 - syn of: Hypselodoris obscura (W. Stimpson, 1855) - (GONIODORIDIDAE)
- obscura, Mourlonia obscura Dickins, 1963 † - (GOSSELETINIDAE) (FOSSIL)
- obscura, Geotrochus obscura J.J. Vermeulen, M. Schilthuizen & T.S. Liew MS - (HELICARIONIDAE)
- obscura, Helix obscura O.F. Müller, 1774 - syn of: Merdigera obscura (O.F. Müller, 1774) - (HELICIDAE)
- obscura, Limopsis obscura Berezovsky, 2015 † - (LIMOPSIDAE) (FOSSIL)
- obscura, Rhabdostropha obscura (J. Donald, 1902 †) - (LOXONEMATIDAE) (FOSSIL)
- obscura, Volvarina obscura (L.A. Reeve, 1865) - (MARGINELLIDAE)
- obscura, Volvarina obscura Auct. non L.A. Reeve, 1865 - syn of: Volvarina taeniata (G.B. I Sowerby, 1846) - (MARGINELLIDAE)
- obscura, Astartila obscura Dickins, 1957 † - (MEGADESMIDAE) (FOSSIL)
- obscura, Mitra obscura F.W. Hutton, 1873 - syn of: Volutomitra obscura (F.W. Hutton, 1873) - (MITRIDAE)
- obscura, Cyrtostropha obscura (Portlock, 1843 †) - (MURCHISONIIDAE) (FOSSIL)
- obscura, Ergalatax obscura R. Houart, 1996 - syn of: Ergalatax martensi (M.M. Schepman, 1892) - (MURICIDAE)
- obscura, Myophorella obscura Saveliev, 1960 † - (MYOPHORELLIDAE) (FOSSIL)
- obscura, Natica obscura Sowerby, 1840 † - (NATICIDAE) (FOSSIL)
- obscura, Nerita obscura J.B. Hombron & C.H. Jacquinot, 1854 - syn of: Nerita ocellata E.J. Le Guillou, 1841 - (NERITIDAE)
- obscura, Onchidella obscura H.P. Plate, 1893 - syn of: Onchidella nigricans (J.R.C. Quoy & J.P. Gaimard, 1832) - (ONCHIDIIDAE)
- obscura, Cyrtoceras obscura Miller, 1875 † - syn of: Faberoceras magister (Miller, 1875 †) - (ONCOCERIDA (unassigned)) (FOSSIL)
- obscura, Ostrea obscura P. Forsskål in C. Niebuhr, 1775 - syn of: Flexopecten glaber (C. Linnaeus, 1758) - (OSTREIDAE)
- obscura, Cleopatra obscura G. Mandahl-Barth, 1968 - (PALUDOMIDAE)
- obscura, Chlamys obscura P. Forsskål in C. Niebuhr, 1775 - syn of: Flexopecten glaber (C. Linnaeus, 1758) - (PECTINIDAE)
- obscura, Plocezyga obscura Hoare & Sturgeon, 1980 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- obscura, Exilia obscura (B. Wade, 1926 †) - (PTYCHATRACTIDAE) (FOSSIL)
- obscura, Eulimella obscura M. Yokoyama, 1922 - (PYRAMIDELLIDAE)
- obscura, Powelliphanta hochstetteri obscura (Beutler, 1901) - (RHYTIDIDAE)
- obscura, Pusillina obscura (R.A. Philippi, 1844) - (RISSOIDAE)
- obscura, Rissoa similis obscura F. Nordsieck, 1972 - (RISSOIDAE)
- obscura, Brookula obscura C.F. Laseron, 1954 - syn of: Brookula angeli (J.E. Tenison-Woods, 1877) - (SEGUENZIOIDEA (unassigned))
- obscura, Semele obscura G.P. Deshayes in L. Maillard, 1863 - syn of: Semele australis (G.B. I Sowerby, 1833) - (SEMELIDAE)
- obscura, Sepietta obscura A. Naef, 1916 - (SEPIOLIDAE)
- obscura, Solariella obscura (J.P.Y. Couthouy, 1838) - (SOLARIELLIDAE)
- obscura, Solemya obscura Stanton † - (SOLEMYIDAE) (FOSSIL)
- obscura, Trivirostra obscura (J.S. Gaskoin, 1849) - (TRIVIIDAE)
- obscura, Monilea obscura W. Wood, 1828 - syn of: Priotrochus obscurus (W. Wood, 1828) - (TROCHIDAE)
- obscura, Stomatia obscura G.B. Sowerby, 1874 - syn of: Stomatia phymotis G.S. Helbling, 1779 - (TROCHIDAE)
- obscura, Monodonta obscura W. Wood, 1828 - syn of: Priotrochus obscurus (W. Wood, 1828) - (TROCHIDAE)
- obscura, Truncatella obscura P.M.A. Morelet, 1882 - (TRUNCATELLIDAE)
- obscura, Turbo obscura P.F. Röding, 1798 - syn of: Turbo petholatus C. Linnaeus, 1758 - (TURBINIDAE)
- obscura, Anodon obscura P.M. Heude, 1880 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- obscura, Centralia obscura C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- obscura, Venus obscura J.F. Gmelin, 1791 - syn of: Venerupis decussata (C. Linnaeus, 1758) - (VENERIDAE)
- obscura, Volutomitra obscura (F.W. Hutton, 1873) - (VOLUTOMITRIDAE)
- obscura, Waimatea obscura F.W. Hutton, 1873 - syn of: Volutomitra obscura (F.W. Hutton, 1873) - (VOLUTOMITRIDAE)
- obscura carinata, Solariella obscura carinata A.E. Verrill, 1882 - syn of: Solariella obscura (J.P.Y. Couthouy, 1838) - (SOLARIELLIDAE)
- obscura intermedia, Solariella obscura intermedia W. Leche, 1878 - syn of: Solariella intermedia (W. Leche, 1878) - (SOLARIELLIDAE)
- Obscuranella, Genus Obscuranella Y.I. Kantor & M.G. Harasewych, 2000 (RANELLIDAE)
- Obscurania, syn of: Genus Xianfengella He & Yang, 1982 † (RUGAECONIDAE) (FOSSIL)
- obscurata, Lispodesthes obscurata White, 1883 † - (APORRHAIDAE) (FOSSIL)
- obscurata, Bithynia obscurata L. Benoit, 1875 - syn of: Bithynia tentaculata (C. Linnaeus, 1758) - (BITHYNIIDAE)
- obscurata, Erronea caurica obscurata F.A. Schilder, 1940 - (CYPRAEIDAE)
- obscurata, Polymita picta obscurata C. de la Torre, 1950 - (HELMINTHOGLYPTIDAE)
- obscurata, Nuttallia obscurata (L.A. Reeve, 1857) - (PSAMMOBIIDAE)
- obscurata, Eopleurotoma obscurata (F.E. Edwards, 1861 †) - (TURRIDAE) (FOSSIL)
- obscurata, Tapes obscurata G.P. Deshayes, 1853 - syn of: Tapes belcheri Sowerby, 1852 - (VENERIDAE)
- obscurate, Pitar obscurate White, 1887 † - (VENERIDAE) (FOSSIL)
- obscuratus, Atys obscuratus W.H. Dall, 1896 † - (HAMINOEIDAE) (FOSSIL)
- obscuratus, Clithon obscuratus Unknown Author - (NERITIDAE)
- obscuratus, Oxychilus obscuratus (C. Porro, 1841) - (OXYCHILIDAE)
- obscurecostata, Amphitomaria obscurecostata A. Nützel & Erwin, 2004 † - (AMPHITOMARIIDAE) (FOSSIL)
- Obscurella, Subgenus Cochlostoma (Obscurella) S. Clessin, 1889 (COCHLOSTOMATIDAE)
- obscurella, Plaxiphora obscurella S.M. Souverbie, 1866 - (MOPALIIDAE)
- obscurellus, Placiphorella obscurellus S.M. Souverbie in S.M. Souverbie & R.P. Montrouzier, 1866 - syn of: Plaxiphora obscurella S.M. Souverbie, 1866 - (MOPALIIDAE)
- Obscuriana, syn of: Subgenus Cochlostoma (Obscurella) S. Clessin, 1889 (COCHLOSTOMATIDAE)
- obscuricosta, Securiconus obscuricosta W.C. Zhou & Q. Xiao, 1984 † - (HELCIONELLIDAE) (FOSSIL)
- obscurior, Helicarion obscurior Hyman, Lamborena & Köhler, 2017 - (HELICARIONIDAE)
- obscurocostatum, Protancyloceras obscurocostatum Vasicek & Hoedemaeker, 2003 † - (PROTANCYLOCERATIDAE) (FOSSIL)
- Obscuropsis, Genus Obscuropsis Hornư, 1992 † (PLATYCERATIDAE) (FOSSIL)
- obscurum, Prophysaon obscurum T.D.A. Cockerell, 1890 - (ANADENIDAE)
- obscurum, Cerithium obscurum J.B. Hombron & C.H. Jacquinot, 1852 - syn of: Clypeomorus batillariaeformis T. Habe & S. Kosuge, 1966 - (CERITHIIDAE)
- obscurum, Cochlostoma obscurum (J.P.R. Draparnaud, 1801) - (COCHLOSTOMATIDAE)
- obscurum, Dentalium obscurum W.H. Dall, 1889 - (DENTALIIDAE)
- obscurum, Muriceras obscurum Flower, 1964 † - (ELLESMEROCERATIDAE) (FOSSIL)
- obscurum, Eurydesma obscurum Reed, 1936 † - (EURYDESMATIDAE) (FOSSIL)
- obscurum, Neopharciceras obscurum Bogoslovsky, 1982 † - (PHARCICERATIDAE) (FOSSIL)
- obscurum, Pomatias obscurum G.B. Sowerby, 1843 - syn of: Adamsiella grayana (L. Pfeiffer, 1846) - (POMATIIDAE)
- obscurum, Glenisteroceras obscurum Flower & Teichert, 1957 † - (SACTORTHOCERATIDAE) (FOSSIL)
- obscurum, Pisidium obscurum T. Prime, 1852 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- obscurum, Vascoceras obscurum Barber, 1957 † - (VASCOCERATIDAE) (FOSSIL)
- obscurum laburdense, Cochlostoma obscurum laburdense (L. de Folin & F. Bèrillon, 1877) - (COCHLOSTOMATIDAE)
- obscurus, Adygeites obscurus Shevyrev, 1995 † - (ADYGEITIDAE) (FOSSIL)
- obscurus, Ammonites obscurus Schluter, 1872 † - syn of: Tetragonites obscurus (Schluter 1872 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- obscurus, Nipponochloritis obscurus (H.A. Pilsbry & Y. Hirase, 1904) - (CAMAENIDAE)
- obscurus, Joculator obscurus A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- obscurus, Protostrioconus obscurus (G.B. II Sowerby, 1833) - (CONIDAE)
- obscurus, Fusus obscurus Wood, 1879 † - (FASCIOLARIIDAE) (FOSSIL)
- obscurus, Phyllosphaerites obscurus Shevyrev, 1995 † - (ISCULITIDAE) (FOSSIL)
- obscurus, Galba obscurus J.L.M. Poiret, 1801 - syn of: Galba truncatula (O.F. Müller, 1774) - (LYMNAEIDAE)
- obscurus, Mytilus obscurus R.W. Dunker, 1857 - syn of: Mytilus planulatus J.B.P.A. Lamarck, 1819 - (MYTILIDAE)
- obscurus, Clidophorus obscurus W.J. Raymond, 1905 † - (NUCULANIDAE) (FOSSIL)
- obscurus, Camptochlamys obscurus (Sowerby, 1818 †) - (PECTINIDAE) (FOSSIL)
- obscurus, Pecten obscurus G.A. Goldfuss, 1833 † - syn of: Camptonectes auritus (Schlotheim, 1813 †) - (PECTINIDAE) (FOSSIL)
- obscurus, Planaxis obscurus A. Adams, 1853 - (PLANAXIDAE)
- obscurus, Monoplex obscurus A. Adams, 1855 - syn of: Monoplex exaratus (L.A. Reeve, 1844) - (RANELLIDAE)
- obscurus, Retites obscurus Ruzhencev & Bogoslovskaya, 1978 † - (RETICULOCERATIDAE) (FOSSIL)
- obscurus, Schizodus obscurus (Sowerby, 1821 †) - (SCHIZODIDAE) (FOSSIL)
- obscurus, Solecurtus obscurus E. Forbes, 1846 - (SOLECURTIDAE)
- obscurus, Tetragonites obscurus (Schluter 1872 †) - (TETRAGONITIDAE) (FOSSIL)
- obscurus, Axinus obscurus Sowerby, 1821 † - syn of: Schizodus obscurus (Sowerby, 1821 †) - (THYASIRIDAE) (FOSSIL)
- obscurus, Hyrcanolestes obscurus H.R. Simroth, 1912 - syn of: Hyrcanolestes velitaris (E.C. Von Martens, 1880) - (TRIGONOCHLAMYDIDAE)
- obscurus, Priotrochus obscurus (W. Wood, 1828) - (TROCHIDAE)
- obscurus, Trochus obscurus W. Wood, 1828 - syn of: Priotrochus obscurus (W. Wood, 1828) - (TROCHIDAE)
- obscurus, Priotrochus obscurus W. Wood, 1828 - syn of: Priotrochus obscurus (W. Wood, 1828) - (TROCHIDAE)
- obscurus, Turbo obscurus J.P.Y. Couthouy, 1838 - syn of: Solariella obscura (J.P.Y. Couthouy, 1838) - (TURBINIDAE)
- obscurus humberti, Buliminus obscurus humberti O.W. Von Rosen, 1901 - syn of: Akramovskiella umbrosa (A. Mousson, 1873) - (ENIDAE)
- obscurus ponsonbyi, Priotrochus obscurus ponsonbyi (G.B. III Sowerby, 1888) - (TROCHIDAE)
- obserata, Actinella obserata R.T. Lowe, 1852 - (HYGROMIIDAE)
- observationis, Rissoa observationis K.H.J. Thiele, 1912 - syn of: Onoba kergueleni (E.A. Smith, 1875) - (RISSOIDAE)
- observationis, Pisidium observationis (H.A. Pilsbry, 1911) - (SPHAERIIDAE)
- observatoria, Nucula observatoria H.F.A. von Ihering, 1907 † - (NUCULIDAE) (FOSSIL)
- obsesa, Persicula obsesa J.H. Redfield, 1848 - (CYSTISCIDAE)
- obsita, Epitonium obsita É.A.A. Locard, 1886 - syn of: Epitonium clathrus (C. Linnaeus, 1758) - (EPITONIIDAE)
- obsolata, Eopteria obsolata T. Kobayashi, 1933 † - syn of: Eopteria asiatica T. Kobayashi, 1933 † - (EOPTERIIDAE) (FOSSIL)
- obsolescens, Bathytoma atractoides obsolescens (E.C. Von Martens & K.H.J. Thiele, 1903) - (BORSONIIDAE)
- obsolescens, Diplodon obsolescens F.C. Baker, 1914 - syn of: Rhipidodonta suavidica (I. Lea, 1856) - (HYRIIDAE)
- obsolescens, Morphotropis obsolescens J. Perner, 1903 † - (ORIOSTOMATIDAE) (FOSSIL)
- obsolescens, Murchisoniceras obsolescens (Barrande, 1868 †) - (ORTHOCERIDA (UNASSIGNED)) (FOSSIL)
- obsolescens, Cyclonema obsolescens J.W. Hall, 1876 † - (PLATYCERATIDAE) (FOSSIL)
- obsoleta, Leptachatina obsoleta L. Pfeiffer, 1857 - (AMASTRIDAE)
- obsoleta, Amnicola obsoleta Yu & Pan, 1977 † - (AMNICOLIDAE) (FOSSIL)
- obsoleta, Amalda obsoleta (G.B. Brocchi, 1814 †) - (ANCILLARIIDAE) (FOSSIL)
- obsoleta, Lufengospira obsoleta Yu & Xi, 1977 † - (BITHYNIIDAE) (FOSSIL)
- obsoleta, Cominella obsoleta (Finlay, 1926 †) - (BUCCINIDAE) (FOSSIL)
- obsoleta, Margarella obsoleta A.W.B. Powell, 1951 - (CALLIOSTOMATIDAE)
- obsoleta, Galeodea obsoleta M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1882 - syn of: Galeodea echinophora (C. Linnaeus, 1758) - (CASSIDAE)
- obsoleta, Mexistrophia obsoleta F.G. Thompson, 2011 - (CERIONIDAE)
- obsoleta, Chondrina spelta obsoleta M. Klemm, 1962 - (CHONDRINIDAE)
- obsoleta, Clausilia obsoleta M. von Kimakowicz, 1883 - syn of: Pyrostoma borealis (O. Böttger, 1878) - (CLAUSILIIDAE)
- obsoleta, Andraea dubia obsoleta A. Schmidt, 1856 - (CLAUSILIIDAE)
- obsoleta, Antizafra obsoleta C.A. Fleming, 1943 † - (COLUMBELLIDAE) (FOSSIL)
- obsoleta, Austrotoma obsoleta Finlay, 1926 † - (CONOIDEA (UNASSIGNED)) (FOSSIL)
- obsoleta, Cyanocyclas obsoleta (G.P. Deshayes, 1854) - (CYRENIDAE)
- obsoleta, Doris obsoleta W.P.E.S. Rüppell & F.S. Leuckart, 1830 - syn of: Goniobranchus obsoletus (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (DORIDIDAE)
- obsoleta, Ellobium obsoleta Phillips, 1829 † - (ELLOBIIDAE) (FOSSIL)
- obsoleta, Leuconopsis obsoleta (F.W. Hutton, 1873) - (ELLOBIIDAE)
- obsoleta, Ovatella obsoleta L. Pfeiffer, 1854 - syn of: Myosotella myosotis (J.P.R. Draparnaud, 1801) - (ELLOBIIDAE)
- obsoleta, Euphemites obsoleta (J.W. Hall, 1879 †) - (EUPHEMITIDAE) (FOSSIL)
- obsoleta, Euconospira obsoleta Girty, 1909 † - (GOSSELETINIDAE) (FOSSIL)
- obsoleta, Luciellina obsoleta Zhu, 1995 † - (GOSSELETINIDAE) (FOSSIL)
- obsoleta, Holopea obsoleta J.W. Hall, 1852 † - (HOLOPEIDAE) (FOSSIL)
- obsoleta, Erycina obsoleta G.P. Deshayes, 1858 † - (LASAEIDAE) (FOSSIL)
- obsoleta, Acesta obsoleta (F. Dujardin, 1837 †) - (LIMIDAE) (FOSSIL)
- obsoleta, Loxonema obsoleta (de Sowerby & Murchison, 1839 †) - (LOXONEMATIDAE) (FOSSIL)
- obsoleta, Oenopota obsoleta A.N. Golikov & O.A. Scarlato, 1985 - (MANGELIIDAE)
- obsoleta, Apiotrigonia obsoleta T. Nakano, 1957 † - (MEGATRIGONIIDAE) (FOSSIL)
- obsoleta, Melanopsis obsoleta A. Fuchs, 1873 † - (MELANOPSIDAE) (FOSSIL)
- obsoleta, Mitromorpha obsoleta R.A. Philippi, 1836 - syn of: Mitromorpha olivoidea (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- obsoleta, Tritia obsoleta (T. Say, 1822 †) - (NASSARIIDAE) (FOSSIL)
- obsoleta, Nassa obsoleta T. Say, 1822 † - syn of: Tritia obsoleta (T. Say, 1822 †) - (NASSARIIDAE) (FOSSIL)
- obsoleta, Ezonuculana mactraeformis obsoleta (T. Nagao, 1932 †) - (NUCULANIDAE) (FOSSIL)
- obsoleta, Radiocentrum chiricahuanum obsoleta H.A. Pilsbry & J.H. Ferriss, 1910 - (OREOHELICIDAE)
- obsoleta, Ovula obsoleta É.A.A. Locard, 1892 - syn of: Simnia spelta (C. Linnaeus, 1758) - (OVULIDAE)
- obsoleta, Tinnyea obsoleta (Lomnicki, 1886 †) - (PACHYCHILIDAE) (FOSSIL)
- obsoleta, Lissarca obsoleta (C.R. Laws, 1944 †) - (PHILOBRYIDAE) (FOSSIL)
- obsoleta, Pholadomya obsoleta Phillips, 1829 † - (PHOLADOMYIDAE) (FOSSIL)
- obsoleta, Tetranota obsoleta Ulrich & Scofield, 1897 † - (PLECTONOTIDAE) (FOSSIL)
- obsoleta, Ptomatis obsoleta J.W. Hall, 1876 † - syn of: Ptomatis patulus (J.W. Hall, 1843 †) - (PLECTONOTIDAE) (FOSSIL)
- obsoleta, Triodopsis obsoleta H.A. Pilsbry, 1894 - (POLYGYRIDAE)
- obsoleta, Uptonia obsoleta (C.T. Simpson, 1843 †) - (POLYMORPHITIDAE) (FOSSIL)
- obsoleta, Tropidophora obsoleta (J.B.P.A. Lamarck, 1822) - (POMATIIDAE)
- obsoleta, Annularia obsoleta (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- obsoleta, Annularodes obsoleta C. de la Torre & P. Bartsch, 1941 - syn of: Annularia obsoleta (C. de la Torre & P. Bartsch, 1941) - (POMATIIDAE)
- obsoleta, Evalea obsoleta (R. Murdoch, 1900 †) - (PYRAMIDELLIDAE) (FOSSIL)
- obsoleta, Turbonilla obsoleta (P.P. Carpenter, 1857) - (PYRAMIDELLIDAE)
- obsoleta, Turboella obsoleta (Wood, 1842 †) - (RISSOIDAE) (FOSSIL)
- obsoleta, Rissoa obsoleta Wood, 1842 † - syn of: Turboella obsoleta (Wood, 1842 †) - (RISSOIDAE) (FOSSIL)
- obsoleta, Alvania obsoleta J. van der Linden, 1993 - syn of: Alvania abstersa J. van der Linden & J.J. Van Aartsen, 1994 - (RISSOIDAE)
- obsoleta, Chiliostigma obsoleta (R. Hoernes, 1856 †) - (RISSOINIDAE) (FOSSIL)
- obsoleta, Skeneopsis obsoleta (A.E.M. Cossmann, 1888 †) - (SKENEOPSIDAE) (FOSSIL)
- obsoleta, Spiraxis obsoleta L. Pfeiffer - syn of: Leptachatina obsoleta L. Pfeiffer, 1857 - (SPIRAXIDAE)
- obsoleta, Yeharella japonica obsoleta T. Kobayashi & K. Amano, 1955 † - (STEINMANELLIDAE) (FOSSIL)
- obsoleta, Terebra obsoleta G.P. Deshayes, 1859 - syn of: Terebra cingulifera J.B.P.A. Lamarck, 1822 - (TEREBRIDAE)
- obsoleta, Thyasira obsoleta (A.E. Verrill & K.J. Bush, 1898) - (THYASIRIDAE)
- obsoleta, Torrecoptis guajenensis obsoleta C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- obsoleta, Periglypta obsoleta (G.P. Deshayes, 1857 †) - (VENERIDAE) (FOSSIL)
- obsoleta, Venus obsoleta L.W. Dillwyn, 1817 - syn of: Venerupis corrugata (J.F. Gmelin, 1791) - (VENERIDAE)
- obsoleta, Caricella obsoleta K.V.W. Palmer, 1953 † - (VOLUTIDAE) (FOSSIL)
- obsoleta, Yoldia obsoleta Konova, 1984 † - (YOLDIIDAE) (FOSSIL)
- obsoletevittatus, Goniatites obsoletevittatus Maurer, 1896 † - syn of: Foordites obsoletevittatus (Maurer, 1896 †) - (GONIATITIDAE) (FOSSIL)
- obsoletevittatus, Aphyllites obsoletevittatus Maurer, 1896 † - syn of: Foordites obsoletevittatus (Maurer, 1896 †) - (MIMOCERATIDAE) (FOSSIL)
- obsoletevittatus, Foordites obsoletevittatus (Maurer, 1896 †) - (PINACITIDAE) (FOSSIL)
- obsoletiformis, Neodesmoceras obsoletiformis Jones, 1963 † - (PACHYDISCIDAE) (FOSSIL)
- obsoletiformis, Cosmetodon obsoletiformis (I. Hayasaka, 1925 †) - (PARALLELODONTIDAE) (FOSSIL)
- obsoletior, Neptunea obsoletior A.T. von Middendorff, 1849 - syn of: Neptunea borealis (R.A. Philippi, 1850) - (BUCCINIDAE)
- obsoletlls, Exilioidea obsoletlls R.R. Talmadge, 1971 - syn of: Exilioidea rectirostris (P.P. Carpenter, 1864) - (PTYCHATRACTIDAE)
- obsoletum, Laevicardium obsoletum L. Spengler, 1799 - syn of: Laevicardium oblongum (J.F. Gmelin, 1791) - (CARDIIDAE)
- obsoletum, Crucilobiceras obsoletum (C.H. Blake †) - (EODEROCERATIDAE) (FOSSIL)
- obsoletum, Eotomaria obsoletum W.J. Raymond, 1905 † - (EOTOMARIIDAE) (FOSSIL)
- obsoletum, Shyndoceras obsoletum Leonova, 1983 † - syn of: Metaperrinites obsoletus (Leonova, 1983 †) - (PERRINITIDAE) (FOSSIL)
- obsoletum, Platypleuroceras obsoletum (C.T. Simpson, 1843 †) - (POLYMORPHITIDAE) (FOSSIL)
- obsoletum, Chondropoma unilabiatum obsoletum C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- obsoletum, Mimimitoceras obsoletum (Kusina, 1980 †) - (PRIONOCERATIDAE) (FOSSIL)
- obsoletum, Globonema obsoletum Ulrich & Scofield, 1897 † - syn of: Globonema niota (J.W. Hall, 1861 †) - (TROCHONEMATIDAE) (FOSSIL)
- obsoletus, Bellerophon obsoletus J.W. Hall, 1843 † - syn of: Ptomatis patulus (J.W. Hall, 1843 †) - (BELLEROPHONTIDAE) (FOSSIL)
- obsoletus, Joculator obsoletus A. Cecalupo & I. Perugia, 2012 - (CERITHIOPSIDAE)
- obsoletus, Goniobranchus obsoletus (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (CHROMODORIDIDAE)
- obsoletus, Anatomites obsoletus Smith, 1927 † - (HALORITIDAE) (FOSSIL)
- obsoletus, Endolobus obsoletus J.K. Zhao, 1954 † - (KONINCKIOCERATIDAE) (FOSSIL)
- obsoletus, Valenciennius obsoletus (V.V. Bogachev, 1931 †) - (LYMNAEIDAE) (FOSSIL)
- obsoletus, Microfusus obsoletus R.R. Talmadge, 1971 - syn of: Exilioidea rectirostris (P.P. Carpenter, 1864) - (NASSARIIDAE)
- obsoletus, Nassarius obsoletus T. Say, 1822 † - syn of: Tritia obsoleta (T. Say, 1822 †) - (NASSARIIDAE) (FOSSIL)
- obsoletus, Parallelodon obsoletus F.B. Meek, 1871 † - (PARALLELODONTIDAE) (FOSSIL)
- obsoletus, Palliolum obsoletus T. Pennant, 1777 - syn of: Palliolum tigerinum (O.F. Müller, 1776) - (PECTINIDAE)
- obsoletus, Metaperrinites obsoletus (Leonova, 1983 †) - (PERRINITIDAE) (FOSSIL)
- obsoletus, Shyndoceras obsoletus Leonova, 1983 † - syn of: Metaperrinites obsoletus (Leonova, 1983 †) - (PERRINITIDAE) (FOSSIL)
- obsoletus, Planaxis obsoletus K.T. Menke, 1851 - (PLANAXIDAE)
- obsoletus, Astieriptychites obsoletus Jeletzky & Kemper, 1988 † - (POLYPTYCHITIDAE) (FOSSIL)
- obsoletus, Exilioidea obsoletus R.R. Talmadge, 1971 - syn of: Exilioidea rectirostris (P.P. Carpenter, 1864) - (PTYCHATRACTIDAE)
- obsoletus, Turbo obsoletus J.F. Gmelin, 1791 - syn of: Turritella exoleta limonensis A.A. Olsson, 1922 - (TURBINIDAE)
- obsoletus, Turritella obsoletus J.F. Gmelin, 1791 - syn of: Turritella exoleta limonensis A.A. Olsson, 1922 - (TURRITELLIDAE)
- Obstengenia, Genus Obstengenia T. Iredale, 1933 (CAMAENIDAE)
- Obsteugenia, Genus Obsteugenia T. Iredale, 1933 (CAMAENIDAE)
- obstinata, Odostomia obstinata C.R. Laws, 1939 - (PYRAMIDELLIDAE)
- obstinatus, Ciliatocardium obstinatus K.B. Barinov, 1992 † - (CARDIIDAE) (FOSSIL)
- obstipisutura, Mesocoelia obstipisutura E.G. Linsley, 1968 † - (MURCHISONIIDAE) (FOSSIL)
- Obstopalia, Genus Obstopalia T. Iredale, 1936 (EPITONIIDAE)
- obstricta, Bulla obstricta A.A. Gould, 1839 - syn of: Acteocina canaliculata (T. Say, 1826) - (BULLIDAE)
- obstricta, Triodopsis obstricta T. Say, 1821 - syn of: Xolotrema obstrictum T. Say, 1821 - (POLYGYRIDAE)
- obstrictum, Xolotrema obstrictum T. Say, 1821 - (POLYGYRIDAE)
- obstrictus, Polyptychoceras obstrictus Jimbo † - (DIPLOMOCERATIDAE) (FOSSIL)
- obstructa, Metodontia obstructa (P.M. Heude, 1882) - (BRADYBAENIDAE)
- obstructa, Monacha obstructa (L. Pfeiffer, 1842) - (HYGROMIIDAE)
- obstructa, Biomphalaria obstructa (P.M.A. Morelet, 1849) - (PLANORBIDAE)
- obstructa anodonta, Planorbula obstructa anodonta H.A. Pilsbry, 1920 - syn of: Biomphalaria obstructa (P.M.A. Morelet, 1849) - (PLANORBIDAE)
- Obstructio, syn of: Genus Armigerus S. Clessin, 1884 (PLANORBIDAE)
- obstructum, Cenoceras obstructum (Eudes-Deslongchamps, 1878 †) - (CENOCERATIDAE) (FOSSIL)
- obstructus, Polinices obstructus (J. Marwick, 1924 †) - (NATICIDAE) (FOSSIL)
- obstructus, Nautilus obstructus Eudes-Deslongchamps, 1878 † - syn of: Cenoceras obstructum (Eudes-Deslongchamps, 1878 †) - (NAUTILIDAE) (FOSSIL)
- Obstrussus, syn of: Genus Naesiotus J.A. Albers, 1850 (BULIMULIDAE)
- obtecta, Camaena obtecta (H. Fischer, 1898) - (CAMAENIDAE)
- obtecta, Spirorbula obtecta (R.T. Lowe, 1831) - (HYGROMIIDAE)
- obtecta, Plaxiphora obtecta P.P. Carpenter in H.A. Pilsbry, 1893 - (MOPALIIDAE)
- obtecta, Natica obtecta R.A. Philippi, 1887 † - syn of: Glossaulax pachystoma (L.H. Hupé, 1854 †) - (NATICIDAE) (FOSSIL)
- obtecta, Scutellastra obtecta (C.F.F. von Krauss, 1848) - (PATELLIDAE)
- obtecta, Patella obtecta C.F.F. von Krauss, 1848 - syn of: Scutellastra obtecta (C.F.F. von Krauss, 1848) - (PATELLIDAE)
- obtecta, Pholas obtecta G.B. II Sowerby, 1849 - syn of: Aspidopholas tubigera (A. Valenciennes, 1846) - (PHOLADIDAE)
- obtectum, Forbesiceras obtectum (Sharpe, 1853 †) - (FORBESICERATIDAE) (FOSSIL)
- obtectum, Opisthosiphon obtectum C. de la Torre & J. Henderson, 1920 - (POMATIIDAE)
- obtectum, Teinostoma obtectum H.A. Pilsbry & J.T.L. McGinty, 1945 - syn of: Teinostoma biscaynense J.T.L. McGinty, 1945 - (TORNIDAE)
- obtectum guayosense, Opisthosiphon obtectum guayosense C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- obtectum seibaboense, Opisthosiphon obtectum seibaboense C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- obtectum tenuicostum, Opisthosiphon obtectum tenuicostum C. de la Torre & J. Henderson, 1921 - (POMATIIDAE)
- obtectus, Bathydomus obtectus K.H.J. Thiele, 1912 - (BUCCINIDAE)
- obtectus, Obscuranella obtectus K.H.J. Thiele, 1912 - syn of: Obscuranella papyrodes Y.I. Kantor & M.G. Harasewych, 2000 - (RANELLIDAE)
- Obtellina, syn of: Genus Tellina C. Linnaeus, 1758 (TELLINIDAE)
- Obtellina, syn of: Genus Quadrans V. Bertin, 1878 (TELLINIDAE)
- Obtortio, Genus Obtortio Hedley, 1899 † (DIASTOMATIDAE) (FOSSIL)
- Obtortio, syn of: Genus Finella A. Adams, 1860 (SCALIOLIDAE)
- OBTORTIONIDAE - syn of Family: SCALIOLIDAE
- obtortus, Ataphrus obtortus W.H. Hudleston, 1894 † - (ATAPHRIDAE) (FOSSIL)
- obtritum, Cerastoderma obtritum É.A.A. Locard, 1886 - syn of: Cerastoderma edule (C. Linnaeus, 1758) - (CARDIIDAE)
- obtruncata, Corbicula obtruncata P.M. Heude, 1887 - syn of: Corbicula fluminea (O.F. Müller, 1774) - (CYRENIDAE)
- obtruncata, Spisula obtruncata Woods, 1850 † - (MACTRIDAE) (FOSSIL)
- obturamentum, Barnea obturamentum (C. Hedley, 1893) - (PHOLADIDAE)
- obturata, Pseudorhaphitoma obturata R.N. Kilburn, 1993 - (MANGELIIDAE)
- obturata, Natica obturata R.A. Philippi, 1855 - syn of: Tectonatica impervia (R.A. Philippi, 1845) - (NATICIDAE)
- obturata, Natica obturata R.A. Philippi, 1855 - syn of: Tectonatica impervia (R.A. Philippi, 1845) - (NATICIDAE)
- obturata, Anodonta obturata P.M. Heude, 1881 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- obturatum, Bermudezsiphona obturatum (C. de la Torre & J. Henderson, 1920) - (POMATIIDAE)
- obturatum sulcosum, Bermudezsiphona obturatum sulcosum C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- obtusa, Achatinella obtusa W. Newcomb - syn of: Leptachatina obtusa L. Pfeiffer, 1856 - (ACHATINELLIDAE)
- obtusa, Brownisca obtusa (M. Connolly, 1931) - (ACHATINIDAE)
- obtusa, Pirsila obtusa L.W. Stephenson, 1953 † - (ACTEONIDAE) (FOSSIL)
- obtusa, Leptachatina obtusa L. Pfeiffer, 1856 - (AMASTRIDAE)
- obtusa, Iselica obtusa (P.P. Carpenter, 1864) - (AMATHINIDAE)
- obtusa, Ampullaria obtusa G.P. Deshayes, 1855 † - syn of: Tretospira obtusa (G.P. Deshayes, 1855 †) - (AMPULLARIIDAE) (FOSSIL)
- obtusa, Amalda obtusa (W.J. Swainson, 1825) - (ANCILLARIIDAE)
- obtusa, Carbonicola obtusa Hind, 1894 † - (ANTHRACOSIIDAE) (FOSSIL)
- obtusa, Architectonica obtusa (H.G. Bronn, 1831 †) - (ARCHITECTONICIDAE) (FOSSIL)
- obtusa, Barbatia obtusa L.A. Reeve, 1844 - syn of: Barbatia virescens (L.A. Reeve, 1844) - (ARCIDAE)
- obtusa, Arctica obtusa Keeping, 1883 † - (ARCTICIDAE) (FOSSIL)
- obtusa, Assiminea obtusa G.E.J. Wattebled, 1886 - (ASSIMINEIDAE)
- obtusa, Basterotia obtusa G.B. III Sowerby, 1894 - (BASTEROTIIDAE)
- obtusa, Bulla obtusa G. Montagu, 1803 - syn of: Retusa obtusa (G. Montagu, 1808) - (BULLIDAE)
- obtusa, Bythinella obtusa C.C. Nutting, 1893 - syn of: Probythinella emarginata (H.C. Küster, 1852) - (BYTHINELLIDAE)
- obtusa, Bythinella obtusa G.W. Tryon, 1870 - syn of: Probythinella emarginata (H.C. Küster, 1852) - (BYTHINELLIDAE)
- obtusa, Cancellaria obtusa G.P. Deshayes, 1830 - (CANCELLARIIDAE)
- obtusa, Cavolinia obtusa G.B. Sowerby, 1878 - syn of: Diacavolinia limbata (A.V.M.D. D'Orbigny, 1836) - (CAVOLINIIDAE)
- obtusa, Ceratomya obtusa J. Gerber, 1918 † - (CERATOMYIDAE) (FOSSIL)
- obtusa, Strophiops obtusa C.J. Maynard & W.F. Clapp, 1921 - (CERIONIDAE)
- obtusa, Ceritellopsis obtusa Fischer, 1964 † - (CERITELLIDAE) (FOSSIL)
- obtusa, Glyphostoma obtusa Martin, 1904 † - (CLATHURELLIDAE) (FOSSIL)
- obtusa, Clausilia obtusa C. Pfeiffer, 1821 - syn of: Clausilia bidentata (H. Strøm, 1765) - (CLAUSILIIDAE)
- obtusa, Littoridina obtusa W.A. Biese, 1944 - (COCHLIOPIDAE)
- obtusa, Pyrene obtusa (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- obtusa, Antizafra obtusa C.A. Fleming, 1943 † - (COLUMBELLIDAE) (FOSSIL)
- obtusa, Columbella obtusa G.B. I Sowerby, 1832 - syn of: Pyrene obtusa (G.B. I Sowerby, 1832) - (COLUMBELLIDAE)
- obtusa, Hyalocylis obtusa S.I. Di Geronimo, 1974 - syn of: Hyalocylis striata (P.C.A.S.L. Rang, 1828) - (CRESEIDAE)
- obtusa, Cypraea obtusa G. Perry, 1811 - syn of: Cypraea pantherina J. Lightfoot, 1786 - (CYPRAEIDAE)
- obtusa, Doris obtusa W. Stimpson, 1855 - (DORIDIDAE)
- obtusa, Drillia obtusa A. von Koenen † - (DRILLIIDAE) (FOSSIL)
- obtusa, Myosotella obtusa T. Brown, 1827 - syn of: Parthenina interstincta (J. Adams, 1797) - (ELLOBIIDAE)
- obtusa, Liospira obtusa Ulrich & Scofield, 1897 † - (EOTOMARIIDAE) (FOSSIL)
- obtusa, Hemiaclis obtusa P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- obtusa, Melanella obtusa (C.F. Laseron, 1955) - (EULIMIDAE)
- obtusa, Bonellia obtusa (H.E. Anton, 1838) - (EULIMIDAE)
- obtusa, Eulima obtusa L. de Folin, 1870 - (EULIMIDAE)
- obtusa, Priscoficus obtusa (P. Marshall, 1917 †) - (FICIDAE) (FOSSIL)
- obtusa, Ludwigia obtusa (Buckman, 1904 †) - (GRAPHOCERATIDAE) (FOSSIL)
- obtusa, Nipponochlamys obtusa (C.A. Westerlund, 1883) - (HELICARIONIDAE)
- obtusa, Micropleurotoma obtusa É.A.A. Locard, 1897 ex Jeffreys ms - syn of: Micropleurotoma travailleuri P. Bouchet & A. Warén, 1980 - (HORAICLAVIDAE)
- obtusa, Caspia obtusa Š. Brusina, 1892 † - (HYDROBIIDAE) (FOSSIL)
- obtusa, Hydrobia obtusa C.L.F. von Sandberger, 1849 † - (HYDROBIIDAE) (FOSSIL)
- obtusa, Fluviopupa obtusa B. Hubendick, 1952 - syn of: Fluviopupa crassiuscula (G.R. von Frauenfeld, 1863) - (HYDROBIIDAE)
- obtusa, Bornia obtusa P.P. Carpenter, 1857 - (KELLIIDAE)
- obtusa, Malletia obtusa (G.O. Sars, 1872) - (MALLETIIDAE)
- obtusa, Bactrocythara obtusa (R.J.L. Guppy, 1896 †) - (MANGELIIDAE) (FOSSIL)
- obtusa, Glabella obtusa (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- obtusa, Marginella obtusa G.B. II Sowerby, 1870 - syn of: Cryptospira grisea (F.P. Jousseaume, 1917) - (MARGINELLIDAE)
- obtusa, Teretrina obtusa F. Haas, 1953 † - (MATHILDIDAE) (FOSSIL)
- obtusa, Melanopsis obtusa (P.M. Pallary, 1920) - (MELANOPSIDAE)
- obtusa, Melanopsis obtusa G.P. Deshayes, 1825 † - (MELANOPSIDAE) (FOSSIL)
- obtusa, Mesodesma obtusa J.C.H. Crosse & P.H. Fischer, 1864 - syn of: Atactodea cuneata (J.B.P.A. Lamarck, 1818) - (MESODESMATIDAE)
- obtusa, Mitra obtusa É.A.A. Locard, 1886 - syn of: Mitra cornicula (C. Linnaeus, 1758) - (MITRIDAE)
- obtusa, Cheilotoma obtusa (Klipstein, 1843 †) - (MURCHISONIIDAE) (FOSSIL)
- obtusa, Anodontites obtusa (J.B. von Spix & J.A. Wagner, 1827) - (MYCETOPODIDAE)
- obtusa, Dolabra obtusa McCoy † - (MYOPHORICARDIIDAE) (FOSSIL)
- obtusa, Nassa obtusa F.P. Marrat, 1880 - syn of: Demoulia ventricosa (J.B.P.A. Lamarck, 1816) - (NASSARIIDAE)
- obtusa, Euspira obtusa (J.G. Jeffreys, 1885) - (NATICIDAE)
- obtusa, Neritina obtusa (W.H. Benson, 1836) - (NERITIDAE)
- obtusa, Phestioidea obtusa Pojeta & al. 1986 † - (NUCULANIDAE) (FOSSIL)
- obtusa, Phestia obtusa Hoare & al., 1989 † - (NUCULANIDAE) (FOSSIL)
- obtusa, Nucula obtusa Sowerby, 1836 † - (NUCULIDAE) (FOSSIL)
- obtusa, Nucula obtusa J.B.P.A. Lamarck, 1799 - (NUCULIDAE)
- obtusa, Pandora pinna obtusa J.B.P.A. Lamarck, 1818 - (PANDORIDAE)
- obtusa, Periploma obtusa S.C.T. Hanley, 1842 - syn of: Periploma planiusculum G.B. I Sowerby, 1834 - (PERIPLOMATIDAE)
- obtusa, Mayabina obtusa (S. Clessin, 1885) - (PHYSIDAE)
- obtusa, Elysia obtusa K. Baba, 1938 - (PLAKOBRANCHIDAE)
- obtusa, Plethocardia obtusa (K.E.I. von Eichwald, 1860 †) - (PLETHOCARDIIDAE) (FOSSIL)
- obtusa, Pleurotomaria obtusa Klipstein, 1843 † - syn of: Cheilotoma obtusa (Klipstein, 1843 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- obtusa, Tropidoceras flandrini obtusa Futterer, 1983 † - (POLYMORPHITIDAE) (FOSSIL)
- obtusa, Ligatella obtusa (L. Pfeiffer, 1862) - (POMATIIDAE)
- obtusa, Cerithidea obtusa (J.B.P.A. Lamarck, 1822) - (POTAMIDIDAE)
- obtusa, Psammobia obtusa H.B. Preston, 1908 - syn of: Gari maculosa J.B.P.A. Lamarck, 1818 - (PSAMMOBIIDAE)
- obtusa, Pseudocyrtodonta obtusa (Barrande, 1881 †) - (PSEUDOCYRTODONTIDAE) (FOSSIL)
- obtusa, Pseudoliva obtusa (G.P. Deshayes, 1835 †) - (PSEUDOLIVIDAE) (FOSSIL)
- obtusa, Dentanitella obtusa Heidelberger, 2001 † - (PSEUDOPHORIDAE) (FOSSIL)
- obtusa, Tretospira obtusa (G.P. Deshayes, 1855 †) - (PURPURINIDAE) (FOSSIL)
- obtusa, Oscilla obtusa (Gould, 1861) - (PYRAMIDELLIDAE)
- obtusa, Chrysallida obtusa T. Brown, 1827 - syn of: Parthenina interstincta (J. Adams, 1797) - (PYRAMIDELLIDAE)
- obtusa, Ceratopea obtusa (Cleland, 1900 †) - (RAPHISTOMATIDAE) (FOSSIL)
- obtusa, Retusa obtusa (G. Montagu, 1808) - (RETUSIDAE)
- obtusa, Retusa obtusa J.G. Jeffreys - syn of: Retusa candidula (É.A.A. Locard, 1892) - (RETUSIDAE)
- obtusa, Obtusella obtusa F.J. Cantraine, 1842 - syn of: Obtusella cantrainei F. Nordsieck, 1972 - (RISSOIDAE)
- obtusa, Bralitzia obtusa (J. Lycett, 1850 †) - (RISSOINIDAE) (FOSSIL)
- obtusa, Scenella obtusa Sardeson, 1892 † - (SCENELLIDAE) (FOSSIL)
- obtusa, Syndosmya obtusa (G.P. Deshayes, 1857 †) - (SEMELIDAE) (FOSSIL)
- obtusa, Simpulopsis obtusa (G.B. I Sowerby, 1821) - (SIMPULOPSIDAE)
- obtusa, Sellinema obtusa (J.J.F. Whiteaves, 1892 †) - (SINUOPEIDAE) (FOSSIL)
- obtusa, Laeviglandina obtusa (L. Pfeiffer, 1844) - (SPIRAXIDAE)
- obtusa, Spathoteredo obtusa (P.B. Sivickis, 1928) - (TEREDINIDAE)
- obtusa, Teredo obtusa P.B. Sivickis, 1928 - syn of: Spathoteredo obtusa (P.B. Sivickis, 1928) - (TEREDINIDAE)
- obtusa, Mastonia obtusa C.F. Laseron, 1958 - (TRIPHORIDAE)
- obtusa, Monodonta obtusa L.W. Dillwyn, 1817 - (TROCHIDAE)
- obtusa, Monodonta obtusa E.R. Guiler, 1951 - syn of: Austrocochlea constricta (J.B.P.A. Lamarck, 1822) - (TROCHIDAE)
- obtusa, Eurytrochus affinis obtusa Y. Hirase - (TROCHIDAE)
- obtusa, Trochotoma obtusa P. Morris & J. Lycett, 1851 † - syn of: Ditremaria putealis (A.E.M. Cossmann, 1885 †) - (TROCHOTOMIDAE) (FOSSIL)
- obtusa, Turbinella pyrum obtusa Unknown Author - (TURBINELLIDAE)
- obtusa, Unio obtusa D'Orbigny, 1835 - syn of: Diplodon chilensis (J.E. Gray, 1852) - (UNIONIDAE)
- obtusa, Anodonta obtusa E. Potier & A. Michaud - syn of: Chambardia rubens (J.B.P.A. Lamarck, 1819) - (UNIONIDAE)
- obtusa, Anodon obtusa P.M. Heude, 1880 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- obtusa, Cincinna obtusa (J.P.R. Draparnaud, 1801) - (VALVATIDAE)
- obtusa, Mercenaria obtusa T.A. Conrad, 1866 - syn of: Mercenaria campechiensis (J.F. Gmelin, 1791) - (VENERIDAE)
- obtusa, Volutifusus obtusa (E. Emmons, 1858 †) - (VOLUTIDAE) (FOSSIL)
- obtusa, Yoldia obtusa G.O. Sars, 1872 - syn of: Malletia obtusa (G.O. Sars, 1872) - (YOLDIIDAE)
- obtusa, Schwartziella obtusa (C.F. Laseron, 1956) - (ZEBINIDAE)
- obtusa, Pandalosia obtusa (C.F. Laseron, 1956) - syn of: Schwartziella obtusa (C.F. Laseron, 1956) - (ZEBINIDAE)
- obtusa aperta, Hydrobia obtusa aperta W.A. Wenz, 1930 † - (HYDROBIIDAE) (FOSSIL)
- obtusa duplicostata, Arca obtusa duplicostata A.W. Grabau & S.G. King, 1928 - syn of: Mesocibota bistrigata (R.W. Dunker, 1866) - (ARCIDAE)
- obtusa guillani, Glabella obtusa guillani S.A.A. Petit De La Saussaye, 1851 - (MARGINELLIDAE)
- obtusa incrassata, Hydrobia obtusa incrassata W.A. Wenz, 1913 † - (HYDROBIIDAE) (FOSSIL)
- obtusa juparana, Anodontites obtusa juparana (H.F.A. von Ihering, 1910) - (MYCETOPODIDAE)
- obtusa lactea, Pyrene obtusa lactea (L.C. Kiener, 1834) - (COLUMBELLIDAE)
- obtusa lajonkaireana, Retusa obtusa lajonkaireana B. de Basterot, 1825 - syn of: Retusa obtusa (G. Montagu, 1808) - (RETUSIDAE)
- obtusa lucida, Anodontites obtusa lucida (A.V.M.D. D'Orbigny, 1835) - (MYCETOPODIDAE)
- obtusa subdistorta, Hydrobia obtusa subdistorta W.A. Wenz, 1913 † - (HYDROBIIDAE) (FOSSIL)
- obtusa tankervillei, Pyrene obtusa tankervillei R.P.J. Hervier, 1899 - (COLUMBELLIDAE)
- obtusa turrita, Retusa obtusa turrita H.P.C. Møller, 1842 - syn of: Retusa obtusa (G. Montagu, 1808) - (RETUSIDAE)
- obtusaeformis, Valvata obtusaeformis Lörenthey, 1906 † - (VALVATIDAE) (FOSSIL)
- obtusalastrum, Pisidium obtusalastrum B.B. Woodward, 1921 - syn of: Pisidium obtusale (J.B.P.A. Lamarck, 1818) - (SPHAERIIDAE)
- obtusale, Pisidium obtusale (J.B.P.A. Lamarck, 1818) - (SPHAERIIDAE)
- obtusale, Pisidium obtusale C. Pfeiffer, 1821 - syn of: Pisidium ventricosum T. Prime, 1851 - (SPHAERIIDAE)
- obtusale magnificum, Pisidium obtusale magnificum C.A. Westerlund, 1873 - syn of: Pisidium obtusale (J.B.P.A. Lamarck, 1818) - (SPHAERIIDAE)
- obtusale solidum, Pisidium obtusale solidum C.A. Westerlund, 1873 - syn of: Pisidium obtusale (J.B.P.A. Lamarck, 1818) - (SPHAERIIDAE)
- obtusalis, Aeolidia obtusalis J. Alder & A. Hancock, 1842 - syn of: Aeolidia papillosa (C. Linnaeus, 1761) - (AEOLIDIIDAE)
- obtusalis, Homalopoma obtusalis (A.A. Baudon, 1852 †) - (COLLONIIDAE) (FOSSIL)
- obtusalis, Helix obtusalis J.R. Bourguignat, 1860 - syn of: Helix albescens G. Jan in E.A. Rossmässler, 1839 - (HELICIDAE)
- obtusalis, Cyclas obtusalis S. Nilsson, 1822 - syn of: Pisidium henslowanum (R. Sheppard, 1825) - (SPHAERIIDAE)
- obtusalis, Cadella obtusalis (G.P. Deshayes, 1855) - (TELLINIDAE)
- obtusalis bicincta, Helix obtusalis bicincta W. Kobelt, 1877 - syn of: Helix albescens G. Jan in E.A. Rossmässler, 1839 - (HELICIDAE)
- obtusangula, Naninia obtusangula L. Pfeiffer - syn of: Hiona exaequata (A.A. Gould, 1846) - (ARIOPHANTIDAE)
- obtusangula, Bucaniella obtusangula E.F.R.K. Koken, 1896 † - syn of: Tetranota jugata (E.F.R.K. Koken, 1896 †) - (BELLEROPHONTIDAE) (FOSSIL)
- obtusangula, Asthenotoma obtusangula (G.B. Brocchi, 1814 †) - (BORSONIIDAE) (FOSSIL)
- obtusangula, Bucanella obtusangula F.B. Meek 1871 † - (BUCANELLIDAE) (FOSSIL)
- obtusangula, Marmolatella obtusangula E.F.R.K. Koken, 1897 † - (DELPHINULOPSIDAE) (FOSSIL)
- obtusangula, Eulima obtusangula Boettger, 1869 † - (EULIMIDAE) (FOSSIL)
- obtusangula, Parakaliella obtusangula (O.W.H. Reinhardt, 1883) - (HELICARIONIDAE)
- obtusangula, Theba obtusangula R.T. Lowe, 1861 - syn of: Theba subdentata helicella W. Wood, 1828 - (HELICIDAE)
- obtusangula, Littorina obtusangula C.L.F. von Sandberger, 1859 † - (LITTORINIDAE) (FOSSIL)
- obtusangula, Murchisonia obtusangula Lindström, 1884 † - (MURCHISONIIDAE) (FOSSIL)
- obtusangula, Neritina obtusangula A. Fuchs, 1870 † - syn of: Theodoxus amblygonioides W.A. Wenz, 1930 † - (NERITIDAE) (FOSSIL)
- obtusangula, Tetranota obtusangula E.F.R.K. Koken, 1897 † - syn of: Tetranota jugata (E.F.R.K. Koken, 1896 †) - (PLECTONOTIDAE) (FOSSIL)
- obtusangulaeformis, Theodoxus obtusangulaeformis Gozhik, 2002 † - (NERITIDAE) (FOSSIL)
- obtusangulus, Clavus obtusangulus (G.B. Brocchi, 1814 †) - (DRILLIIDAE) (FOSSIL)
- obtusangulus, Euomphalus obtusangulus Angelin & Lindström, 1880 † - syn of: Palaeomphalus obtusangulus (Angelin & Lindström, 1880 †) - (EUOMPHALIDAE) (FOSSIL)
- obtusangulus, Palaeomphalus obtusangulus (Angelin & Lindström, 1880 †) - (HELICOTOMIDAE) (FOSSIL)
- obtusangulus, Theodoxus cyrtocelis obtusangulus (C.F.F. von Krauss, 1852 †) - (NERITIDAE) (FOSSIL)
- obtusantis, Oscilla obtusantis E. Saurin, 1962 - (PYRAMIDELLIDAE)
- obtusata, Anatoma obtusata (A.N. Golikov & V.V. Gulbin, 1978) - (ANATOMIDAE)
- obtusata, Anatoma obtusata A.N. Golikov & V.V. Gulbin, 1978 - syn of: Anatoma obtusata (A.N. Golikov & V.V. Gulbin, 1978) - (ANATOMIDAE)
- obtusata, Dicroloma obtusata (Hebert & Deslongchamps, 1860 †) - (APORRHAIDAE) (FOSSIL)
- obtusata, Alaria obtusata Hebert & Deslongchamps, 1860 † - syn of: Dicroloma obtusata (Hebert & Deslongchamps, 1860 †) - (APORRHAIDAE) (FOSSIL)
- obtusata, Helix obtusata E.A. Rossmässler, 1837 - syn of: Helix albescens G. Jan in E.A. Rossmässler, 1839 - (HELICIDAE)
- obtusata, Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata, Strigatella obtusata P. Dautzenberg & J.L. Bouge, 1923 - syn of: Strigatella paupercula (C. Linnaeus, 1758) - (MITRIDAE)
- obtusata, Demoulia obtusata (J.H.F. Link, 1807) - (NASSARIIDAE)
- obtusata, Nassa obtusata A. Adams, 1852 - syn of: Phrontis alba (T. Say, 1826) - (NASSARIIDAE)
- obtusata, Ancylastrum obtusata B. Walker, 1926 - (PLANORBIDAE)
- obtusata, Rostellaria obtusata Hebert & Deslongchamps, 1860 † - syn of: Dicroloma obtusata (Hebert & Deslongchamps, 1860 †) - (ROSTELLARIIDAE) (FOSSIL)
- obtusata, Scissurella obtusata A.N. Golikov & V.V. Gulbin, 1978 - syn of: Anatoma concinna (C.B. Adams, 1862) - (SCISSURELLIDAE)
- obtusata, Anodonta obtusata C.T. Simpson, 1900 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- obtusata, Xylophaga obtusata J. Knudsen, 1961 - (XYLOPHAGAIDAE)
- obtusata, Yoldia obtusata L. Krishtofovich, 1984 † - syn of: Portlandella pilvoensis Slodkewitsch, 1938 † - (YOLDIIDAE) (FOSSIL)
- obtusata aestuarii, Littorina obtusata aestuarii J.G. Jeffreys, 1869 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata albida, Littorina obtusata albida H.A. Schlesch, 1930 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata ambigua, Littorina obtusata ambigua P. Dautzenberg & H. Fischer, 1915 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata arctica, Littorina obtusata arctica H.P.C. Møller, 1842 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata aurantia, Littorina obtusata aurantia P. Dautzenberg, 1893 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata aurantiaca, Littorina obtusata aurantiaca P. Dautzenberg & H. Fischer, 1915 - (LITTORINIDAE)
- obtusata balionis, Helix obtusata balionis O. von Retowski, 1889 - syn of: Helix albescens G. Jan in E.A. Rossmässler, 1839 - (HELICIDAE)
- obtusata balteata, Littorina obtusata balteata P. Dautzenberg & H. Fischer, 1915 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata castanea, Littorina obtusata castanea P. Dautzenberg & H. Fischer, 1915 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata citrina, Littorina obtusata citrina P. Dautzenberg & H. Fischer, 1915 - (LITTORINIDAE)
- obtusata compacta, Littorina obtusata compacta J.G. Jeffreys, 1865 - syn of: Littorina fabalis (W. Turton, 1825) - (LITTORINIDAE)
- obtusata elatiorangulata, Littorina obtusata elatiorangulata A.T. von Middendorff, 1849 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata fasciata, Littorina obtusata fasciata K.T. Menke, 1845 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata fusca, Littorina obtusata fusca K.T. Menke, 1845 - (LITTORINIDAE)
- obtusata globosa, Littorina obtusata globosa A.T. von Middendorff, 1849 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata inversicolor, Littorina obtusata inversicolor P. Dautzenberg & H. Fischer, 1915 - (LITTORINIDAE)
- obtusata lineolata, Littorina obtusata lineolata P. Dautzenberg & P. Fisher, 1915 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata lineolata, Littorina obtusata lineolata P. Dautzenberg & H. Fischer, 1915 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata littoralis, Littorina obtusata littoralis P. Dautzenberg & H. Fischer, 1915 - syn of: Littorina fabalis (W. Turton, 1825) - (LITTORINIDAE)
- obtusata lutea, Littorina obtusata lutea P. Dautzenberg & H. Fischer, 1915 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata magnei, Littorina obtusata magnei C.F. Sacchi, 1961 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata olivacea, Littorina obtusata olivacea P. Dautzenberg & H. Fischer, 1915 - (LITTORINIDAE)
- obtusata orana, Littorina obtusata orana A.M. Norman, 1888 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata ornata, Littorina obtusata ornata J.G. Jeffreys, 1865 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata picta, Littorina obtusata picta K.T. Menke, 1845 - syn of: Littorina fabalis (W. Turton, 1825) - (LITTORINIDAE)
- obtusata pulchra, Littorina obtusata pulchra H.A. Schlesch, 1930 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata reticulata, Echinolittorina obtusata reticulata P. Dautzenberg & H. Fischer, 1915 - syn of: Echinolittorina reticulata (H.E. Anton, 1838) - (LITTORINIDAE)
- obtusata tessellata, Littorina obtusata tessellata P. Dautzenberg & H. Fischer, 1915 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata torquata, Littorina obtusata torquata C.F. Sacchi, 1963 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata unicolor, Littorina obtusata unicolor K.T. Menke, 1845 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata virescens, Littorina obtusata virescens H.A. Schlesch, 1930 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusata zonata, Littorina obtusata zonata K.T. Menke, 1845 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (LITTORINIDAE)
- obtusatum, Ancyloceras obtusatum A. von Koenen, 1902 † - (ANCYLOCERATIDAE) (FOSSIL)
- obtusatum, Pisidium obtusatum S. Clessin, 1877 - syn of: Pisidium casertanum (Poli, 1791) - (SPHAERIIDAE)
- obtusatus, Clavator obtusatus (J.F. Gmelin, 1791) - (ACAVIDAE)
- obtusatus, Modulus obtusatus (R.A. Philippi, 1846) - (MODULIDAE)
- obtusatus, Diempterus obtusatus Hebert & Deslongchamps, 1860 † - syn of: Dicroloma obtusata (Hebert & Deslongchamps, 1860 †) - (SPINILOMATIDAE) (FOSSIL)
- obtusatus, Turbo obtusatus C. Linnaeus, 1758 - syn of: Littorina obtusata (C. Linnaeus, 1758) - (TURBINIDAE)
- obtusecarinata, Dreissena obtusecarinata N.I. Andrusov, 1897 - syn of: Dreissena polymorpha (P.S. Pallas, 1771) - (DREISSENIDAE)
- obtusecarinata, Creneatachea obtusecarinata (C.L.F. von Sandberger, 1858 †) - (HELICIDAE) (FOSSIL)
- obtusecarinata, Helix obtusecarinata C.L.F. von Sandberger, 1858 † - syn of: Creneatachea obtusecarinata (C.L.F. von Sandberger, 1858 †) - (HELICIDAE) (FOSSIL)
- obtusecarinata, Staja obtusecarinata (A. Fuchs, 1870 †) - (HYDROBIIDAE) (FOSSIL)
- obtusegaleatus, Arcestes obtusegaleatus Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- obtuseliratus, Enixotrophon obtuseliratus (M.M. Schepman, 1911) - (MURICIDAE)
- Obtusella, Genus Obtusella A.E.M. Cossmann, 1921 (RISSOIDAE)
- obtusellaeformis, Gofasia obtusellaeformis S. Gofas, 2007 - (RISSOIDAE)
- obtusenodosa, Hoplites obtusenodosa O. von Retowski, 1893 † - (HOPLITIDAE) (FOSSIL)
- obtusenodosa, Delphinella obtusenodosa (O. von Retowski 1893 †) - (NEOCOMITIDAE) (FOSSIL)
- obtusicacuminis, Pseudozygopleura obtusicacuminis Knight, 1930 † - (PSEUDOZYGOPLEURIDAE) (FOSSIL)
- obtusicostata, Lienardia obtusicostata (E.A. Smith, 1882) - (CLATHURELLIDAE)
- obtusicostata, Nodiscala obtusicostata (Wood, 1842 †) - (EPITONIIDAE) (FOSSIL)
- obtusicostata, Acirsa obtusicostata G.O. Sars, 1878 - syn of: Acirsa coarctata (J.G. Jeffreys, 1884) - (EPITONIIDAE)
- obtusicostata, Scalaria obtusicostata Wood, 1842 † - syn of: Nodiscala obtusicostata (Wood, 1842 †) - (EPITONIIDAE) (FOSSIL)
- obtusicostata, Eomonotis obtusicostata (Westermann, 1966 †) - (MONOTIDAE) (FOSSIL)
- obtusicostata, Pleurotoma obtusicostata E.A. Smith, 1882 - syn of: Lienardia obtusicostata (E.A. Smith, 1882) - (TURRIDAE)
- Obtusicostites, Genus Obtusicostites Buckman, 1921 † (AMMONOIDEA (UNASSIGNED)) (FOSSIL)
- obtusiformis, Simobelus obtusiformis Saks & Nalnyaeva, 1966 † - (BELEMNITIDA (UNASSIGNED)) (FOSSIL)
- obtusiformis, Ludwigia obtusiformis Buckman, 1913 † - (GRAPHOCERATIDAE) (FOSSIL)
- obtusiformis, Tenagodus obtusiformis Martin, 1905 - (SILIQUARIIDAE)
- obtusifrons, Vanuxemia obtusifrons (Ulrich, 1894 †) - (CYRTODONTIDAE) (FOSSIL)
- obtusifrons, Cypricardites obtusifrons Ulrich, 1894 † - syn of: Vanuxemia obtusifrons (Ulrich, 1894 †) - (KALENTERIDAE) (FOSSIL)
- obtusigemmata, Comitas obtusigemmata (M.M. Schepman, 1913) - (PSEUDOMELATOMIDAE)
- obtusiliratum, Trophon obtusiliratum M.M. Schepman, 1911 - syn of: Enixotrophon obtuseliratus (M.M. Schepman, 1911) - (MURICIDAE)
- obtusiplicatus, Bulacanites obtusiplicatus T. Kase & Aguilar, 2006 † - (LUCINIDAE) (FOSSIL)
- obtusirostris, Cuspidaria obtusirostris T.A. Okutani, 1962 - (CUSPIDARIIDAE)
- obtusispinosum, Vexillum obtusispinosum (G.B. II Sowerby, 1874) - (COSTELLARIIDAE)
- obtusispira, Eatoniella obtusispira (A.W.B. Powell, 1955) - (EATONIELLIDAE)
- obtusispira, Omphalotrochus obtusispira (Shumard, 1859 †) - (OMPHALOTROCHIDAE) (FOSSIL)
- obtusispira, Bulinus obtusispira E.A. Smith, 1882 - (PLANORBIDAE)
- obtusispira, Pleurotomaria obtusispira Shumard, 1859 † - syn of: Omphalotrochus obtusispira (Shumard, 1859 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- obtusispira, Setia obtusispira G. Seguenza, 1876 - (RISSOIDAE)
- obtusissima, Radix obtusissima (G.P. Deshayes, 1838 †) - (LYMNAEIDAE) (FOSSIL)
- obtusiuscula, Eulitoma obtusiuscula P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- obtusoapicata, Melanella obtusoapicata P. Bouchet & A. Warén, 1986 - (EULIMIDAE)
- Obtusoconus, Genus Obtusoconus Yü , 1979 † (HELCIONELLIDAE) (FOSSIL)
- obtusoides, Barbatia virescens obtusoides P. Nyst, 1848 - (ARCIDAE)
- Obtusopyrgus, Genus Obtusopyrgus M. Haase, 2008 (TATEIDAE)
- obtustatus, Plicifusus obtustatus A.N. Golikov, 1985 - syn of: Plicifusus kroeyeri (H.P.C. Møller, 1842) - (BUCCINIDAE)
- obtusula, Ovula obtusula P.M. Pallary, 1900 - syn of: Pseudosimnia carnea (J.L.M. Poiret, 1789) - (OVULIDAE)
- obtusula, Anodonta obtusula L.H. Hupé, 1857 - syn of: Anodontites trigona (J.B. von Spix & J.A. Wagner, 1827) - (UNIONIDAE)
- obtusum, Asteroceras obtusum (J. de C. Sowerby, 1817 †) - (ARIETITIDAE) (FOSSIL)
- obtusum, Caecum obtusum P.P. Carpenter, 1857 - (CAECIDAE)
- obtusum, Cardioceras obtusum Reeside, 1919 † - (CARDIOCERATIDAE) (FOSSIL)
- obtusum, Dentalium obtusum Z. Qi & X.T. Ma, 1989 - (DENTALIIDAE)
- obtusum, Xiphoceras obtusum P.A. Zhuravleva, 1972 † - syn of: Lysagoroceras subfusiforme (Münster, 1840 †) - (DISCOSORIDA (unassigned)) (FOSSIL)
- obtusum, Epitonium obtusum (G.B. II Sowerby, 1844) - (EPITONIIDAE)
- obtusum, Gonioceras obtusum Flower, 1957 † - (GONIOCERATIDAE) (FOSSIL)
- obtusum, Nostoceras obtusum Howarth, 1965 † - (NOSTOCERATIDAE) (FOSSIL)
- obtusum, Ovula obtusum G.B. I Sowerby, 1828 - syn of: Simnia spelta (C. Linnaeus, 1758) - (OVULIDAE)
- obtusum, Tropidoceras obtusum Futterer, 1983 † - syn of: Tropidoceras flandrini obtusa Futterer, 1983 † - (POLYMORPHITIDAE) (FOSSIL)
- obtusum, Pomatias obtusum J.P.R. Draparnaud, 1801 - syn of: Cincinna obtusa (J.P.R. Draparnaud, 1801) - (POMATIIDAE)
- obtusum, Arctomeekoceras obtusum Tozer, 1994 † - (PROPTYCHITIDAE) (FOSSIL)
- obtusum, Spirulirostridium obtusum A. Naef, 1922 † - (SEPIIDA (UNASSIGNED)) (FOSSIL)
- obtusum, Terebellum obtusum Sowerby, 1840 † - (SERAPHSIDAE) (FOSSIL)
- obtusum, Grypoceras obtusum (Mojsisovics, 1873 †) - (TAINOCERATIDAE) (FOSSIL)
- obtusum, Pleurotoma obtusum É.A.A. Locard, 1897 ex Jeffreys ms - syn of: Micropleurotoma travailleuri P. Bouchet & A. Warén, 1980 - (TURRIDAE)
- obtusus, Elasmias fuscum obtusus H.A. Pilsbry & C.M. Cooke, 1915 - (ACHATINELLIDAE)
- obtusus, Aspenites obtusus Smith, 1932 † - syn of: Aspenites acutus A. Hyatt & Smith, 1905 † - (ASPENITIDAE) (FOSSIL)
- obtusus, Baculites obtusus F.B. Meek, 1876 † - (BACULITIDAE) (FOSSIL)
- obtusus, Hemiaspenites obtusus A. Hyatt & Smith, 1905 † - syn of: Aspenites acutus A. Hyatt & Smith, 1905 † - (CERATITIDA (unassigned)) (FOSSIL)
- obtusus, Conus obtusus L.C. Kiener, 1850 - syn of: Varioconus variegatus (L.C. Kiener, 1848) - (CONIDAE)
- obtusus, Euomphalus obtusus J.W. Hall, 1858 † - syn of: Euomphalus subplanus J.W. Hall, 1852 † - (EUOMPHALIDAE) (FOSSIL)
- obtusus, Cylindrus obtusus (J.P.R. Draparnaud, 1805) - (HELICIDAE)
- obtusus, Hoplites obtusus Spath, 1925 † - (HOPLITIDAE) (FOSSIL)
- obtusus, Ischnochiton obtusus P.P. Carpenter in H.A. Pilsbry, 1893 - (ISCHNOCHITONIDAE)
- obtusus, Somatogyrus obtusus B. Walker, 1904 - (LITHOGLYPHIDAE)
- obtusus, Tyrsoecus obtusus F. Haas, 1953 † - (LOXONEMATIDAE) (FOSSIL)
- obtusus, Enixotrophon obtusus (B.A. Marshall & R. Houart, 2011) - (MURICIDAE)
- obtusus, Murex obtusus G.B. III Sowerby, 1894 - syn of: Favartia minatauros G.E. Radwin & D'Attilio, 1976 - (MURICIDAE)
- obtusus, Murex obtusus G.B. II Sowerby, 1879 - syn of: Favartia humilis (W.J. Broderip, 1833) - (MURICIDAE)
- obtusus, Nautilus obtusus Mojsisovics, 1873 † - syn of: Grypoceras obtusum (Mojsisovics, 1873 †) - (NAUTILIDAE) (FOSSIL)
- obtusus, Parallelodon obtusus (B. Phillips, 1836 †) - (PARALLELODONTIDAE) (FOSSIL)
- obtusus, Parathisbites obtusus Tozer, 1994 † - (PARATHISBITIDAE) (FOSSIL)
- obtusus, Bulinus obtusus G. Mandahl-Barth, 1973 - (PLANORBIDAE)
- obtusus, Ancylus obtusus P.M.A. Morelet, 1845 - syn of: Ancylus fluviatilis O.F. Müller, 1774 - (PLANORBIDAE)
- obtusus, Strophostylus obtusus J.W. Hall, 1859 † - (PLATYCERATIDAE) (FOSSIL)
- obtusus, Lacunopsis obtusus Harmer † - (POMATIOPSIDAE) (FOSSIL)
- obtusus, Vavilovites obtusus Tozer, 1994 † - (PROPTYCHITIDAE) (FOSSIL)
- obtusus, Tenagodus obtusus H.C.F. Schumacher, 1817 - (SILIQUARIIDAE)
- obtusus, Coptostylus obtusus (G.P. Deshayes, 1825 †) - (THIARIDAE) (FOSSIL)
- obtusus, Turbo obtusus J. Brown, 1841 † - (TURBINIDAE) (FOSSIL)
- obtusus, Anodon obtusus J.B. von Spix & J.A. Wagner, 1827 - syn of: Anodontites obtusa (J.B. von Spix & J.A. Wagner, 1827) - (UNIONIDAE)
- obtusus semistriata, Retusa obtusus semistriata J.G. Jeffreys, 1869 - syn of: Retusa obtusa (G. Montagu, 1808) - (RETUSIDAE)
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