- okhotensis, Clinopegma okhotensis (W.H. Dall, 1925) - (BUCCINIDAE)
- okhotensis, Clione okhotensis Yamazaki & Kumahara, 2016 - (CLIONIDAE)
- okhotensis, Proclydonautilus okhotensis E.S. Sobolev, 1998 † - (CLYDONAUTILIDAE) (FOSSIL)
- okhotensis, Aforia okhotensis P. Bartsch, 1945 - syn of: Aforia circinata (W.H. Dall, 1873) - (COCHLESPIRIDAE)
- okhotensis, Boreotrophon okhotensis R.V. Egorov, 1993 - (MURICIDAE)
- okhoticus, Choanomphalus okhoticus L.A. Prozorova & Y.I. Starobogatov, 1997 - (PLANORBIDAE)
- Okhotodesma, Genus Okhotodesma Biakov, 2008 (ATOMODESMATIDAE) (FOSSIL)
- Okhototrachyceras, Genus Okhototrachyceras Konstantinov , 2012 (TRACHYCERATIDAE) (FOSSIL)
- okhotskanus, Plicifusus okhotskanus (R. Tiba, 1973) - (BUCCINIDAE)
- okhotskensis, Aforia okhotskensis P. Bartsch, 1945 - syn of: Aforia circinata (W.H. Dall, 1873) - (COCHLESPIRIDAE)
- oki, Euhadra sandai oki H.A. Pilsbry, 1928 - (BRADYBAENIDAE)
- okicola, Euhadra dixoni okicola H.A. Pilsbry, 1927 - (BRADYBAENIDAE)
- okiensis, Satsuma okiensis H.A. Pilsbry & Y. Hirase, 1908 - (CAMAENIDAE)
- okiensis, Chamalycaeus satsumanus okiensis J.T. Kuroda - (CYCLOPHORIDAE)
- okiensis, Diplommatina okiensis H.A. Pilsbry & Y. Hirase, 1908 - (DIPLOMMATINIDAE)
- okiensis, Yabepecten okiensis T. Matsubara, 2014 † - (PECTINIDAE) (FOSSIL)
- okiensis tsushimana, Diplommatina okiensis tsushimana H.A. Pilsbry & Y. Hirase, 1909 - (DIPLOMMATINIDAE)
- okimodoki, Mesophaedusa vasta okimodoki H. Minato & A. Tada, 1990 - (CLAUSILIIDAE)
- okinaaense, Trachycardium okinaaense J.T. Kuroda, 1960 - syn of: Acrosterigma okinawaensis (J.T. Kuroda, 1960) - (CARDIIDAE)
- okinavensis, Latiromitra okinavensis (F.S. MacNeil, 1961) - (PTYCHATRACTIDAE)
- okinavensis, Pinguigemmula okinavensis F.S. MacNeil, 1960 † - (TURRIDAE) (FOSSIL)
- okinavia, Nassaria okinavia (Mac Neil, 1960) - (NASSARIIDAE)
- okinawa, Halgerda okinawa C.H. Carlson & P.J. Hoff, 2000 - (DISCODORIDIDAE)
- okinawae, Gymnodoris okinawae K. Baba, 1936 - (GYMNODORIDIDAE)
- okinawaense, Vasticardium elongatum okinawaense (J.T. Kuroda, 1960) - (CARDIIDAE)
- okinawaense, Sphaerium japonicum okinawaense A. Mori, 1937 - (SPHAERIIDAE)
- okinawaensis, Acrosterigma okinawaensis (J.T. Kuroda, 1960) - (CARDIIDAE)
- okinawaensis, Chamalycaeus okinawaensis S. Uozumi, A. Yamamoto & T. Habe, 1979 - (CYCLOPHORIDAE)
- okinawaensis, Emarginella okinawaensis T. Habe, 1953 - (FISSURELLIDAE)
- okinawaensis, Ribriarca okinawaensis H. Noda, 1980 - syn of: Ribriarca polycymoides (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (NOETIIDAE)
- okinawaensis, Arcopsis okinawaensis H. Noda, 1980 - syn of: Ribriarca polycymoides (K.H.J. Thiele & S.G.A. Jaeckel, 1931) - (NOETIIDAE)
- Okinawanoarca, Genus Okinawanoarca Noda, 1980 (ARCIDA (unassigned)) (FOSSIL)
- okinawanus, Luchuconulus okinawanus H.A. Pilsbry, 1928 - (EUCONULIDAE)
- Okinawastraea, syn of: Genus Astralium J.H.F. Link, 1807 (TURBINIDAE)
- Okinawavoluta, syn of: Genus Latiromitra Ι.A.A. Locard, 1897 (PTYCHATRACTIDAE)
- okinawensis, Rissoina okinawensis W.J. Sleurs, 1993 - (RISSOINIDAE)
- okinoerabensis, Albinaria praeclara okinoerabensis H.A. Pilsbry, 1905 - (CLAUSILIIDAE)
- okinoerabuensis, Coniglobus mercatorius okinoerabuensis T. Habe & M. Chinen, 1985 - (CAMAENIDAE)
- okinoerabuensis, Luchuphaedusa bernardii okinoerabuensis (H.A. Pilsbry, 1905) - (CLAUSILIIDAE)
- okinoerabuensis, Chamalycaeus tokunoshimanus okinoerabuensis H. Minato, 1974 - (CYCLOPHORIDAE)
- okinoerabuensis, Vertigo okinoerabuensis H.A. Pilsbry & Y. Hirase, 1904 - (VERTIGINIDAE)
- okinoshimae, Trishoplita okinoshimae H.A. Pilsbry, 1902 - (BRADYBAENIDAE)
- okinoshimana, Satsuma myomphala okinoshimana H.A. Pilsbry & Y. Hirase, 1904 - (CAMAENIDAE)
- okinoshimana, Kaliella okinoshimana H.A. Pilsbry & Y. Hirase, 1904 - syn of: Trochochlamys okinoshimana (H.A. Pilsbry & Y. Hirase, 1904) - (CHRONIDAE)
- okinoshimana, Stereophaedusa japonica okinoshimana H.A. Pilsbry, 1902 - (CLAUSILIIDAE)
- okinoshimana, Trochochlamys okinoshimana (H.A. Pilsbry & Y. Hirase, 1904) - (HELICARIONIDAE)
- okitsushimana, Hemizaptyx stimpsoni okitsushimana A. Yamamoto & S. Uozumi, 1977 - (CLAUSILIIDAE)
- okkai, Pseudosacculus okkai (Y. Hirase, 1927) - (VELUTINIDAE)
- oklahomae, Neodimorphoceras oklahomae (Girty, 1911 †) - (NEODIMORPHOCERATIDAE) (FOSSIL)
- oklahomaense, Oxyprora oklahomaense (Beede, 1902 †) - (BRANSONIIDAE) (FOSSIL)
- oklahomaensis, Aviculopecten oklahomaensis Beede, 1907 † - syn of: Heteropecten vanvleeti (Beede, 1902 †) - (AVICULOPECTINIDAE) (FOSSIL)
- oklahomaensis, Schizodus oklahomaensis Beede, 1907 † - syn of: Lyroschizodus oklahomensis (Beede, 1907 †) - (SCHIZODIDAE) (FOSSIL)
- oklahomarum, Catinella oklahomarum G.R. Webb, 1953 - (SUCCINEIDAE)
- oklahomarum loculosa, Catinella oklahomarum loculosa G.R. Webb, 1954 - (SUCCINEIDAE)
- oklahomense, Anthracoceras oklahomense Miller & Owen, 1939 † - (ANTHRACOCERATIDAE) (FOSSIL)
- oklahomense, Sanguinolites oklahomense Snider 1915 † - (SANGUINOLITIDAE) (FOSSIL)
- oklahomensis, Streblopteria oklahomensis Newell, 1938 † - (DELTOPECTINIDAE) (FOSSIL)
- oklahomensis, Donovaniconus oklahomensis Doguzhaeva & al., 2002 † - (DONOVANICONIDAE) (FOSSIL)
- oklahomensis, Glaphyrites oklahomensis Elias, 1952 † - (GLAPHYRITIDAE) (FOSSIL)
- oklahomensis, Ivoechiton oklahomensis Smith & Toomey, 1964 † - (GOTLANDOCHITONIDAE) (FOSSIL)
- oklahomensis, Maximites oklahomensis T.J. Frest & al., 1981 † - (MAXIMITIDAE) (FOSSIL)
- oklahomensis, Lyroschizodus oklahomensis (Beede, 1907 †) - (SCHIZODIDAE) (FOSSIL)
- oklahomensis, Schizodus oklahomensis Beede, 1907 † - syn of: Lyroschizodus oklahomensis (Beede, 1907 †) - (SCHIZODIDAE) (FOSSIL)
- Okribites, Genus Okribites Kakhadze, 1937 (PARKINSONIIDAE) (FOSSIL)
- okrugljakensis, Gyraulus okrugljakensis T.A. Neubauer & al., 2014 - (PLANORBIDAE)
- okuboi, Gudeodiscus okuboi B. Páll-Gergely & A. Hunyadi, 2013 - (PLECTOPYLIDAE)
- okudai, Siphonodentalium okudai T. Habe, 1953 - (GADILIDAE)
- okudai, Oenopota okudai T. Habe, 1958 - (MANGELIIDAE)
- okunevae, Oxytoma okunevae Milova, 1985 † - (OXYTOMIDAE) (FOSSIL)
- Okunominetania, Genus Okunominetania Ichikawa, 1954 (MYOPHORIIDAE) (FOSSIL)
- okushirense, Clinocardium okushirense S. Uozumi & Fujie, 1966 † - (CARDIIDAE) (FOSSIL)
- okutamaensis, Pinguiphaedusa hakonensis okutamaensis (J.T. Kuroda, 1963) - (CLAUSILIIDAE)
- okutani, Erosaria okutani J.G. Walls, 1980 - syn of: Erosaria lamarckii (J.E. Gray, 1825) - (CYPRAEIDAE)
- okutanica, Limopsis okutanica W.H. Dall, 1916 - syn of: Limopsis akutanica W.H. Dall, 1916 - (LIMOPSIDAE)
- okutanii, Falsimohnia okutanii (H. Numanami, 1996) - (BUCCINIDAE)
- okutanii, Neadmete okutanii R.E. Petit, 1974 - (CANCELLARIIDAE)
- okutanii, Coccopigya okutanii K. Hasegawa, 1997 - (COCCULINIDAE)
- okutanii, Gonatopsis okutanii K.N. Nesis, 1972 - (GONATIDAE)
- okutanii, Zygoceras okutanii G.T. Poppe & S.P. Tagaro, 2010 - (HALOCERATIDAE)
- okutanii, Obesotoma okutanii I.P. Bogdanov & K. Itô, 1992 - (MANGELIIDAE)
- okutanii, Mastigoteuthis okutanii (M.A. Salcedo-Vargas, 1997) - (MASTIGOTEUTHIDAE)
- okutanii, Placiphorella okutanii H. Saito, K. Fujikura & E. Tsuchida, 2008 - (MOPALIIDAE)
- okutanii, Reishia okutanii Thach, 2016 - (MURICIDAE)
- okutanii, Aliceia okutanii T. Sasaki & A. Warén, 2007 - (RAPHITOMIDAE)
- okutanii, Silicula okutanii G.M. Kamenev, 2014 - (SILICULIDAE)
- okutanii, Phreagena okutanii (S. Kojima & S. Ohta, 1997) - (VESICOMYIDAE)
- okuyamensis, Maizuria okuyamensis Nakazawa, 1959 † - (BAKEVELLIIDAE) (FOSSIL)
- olaaensis, Leptachatina konaensis olaaensis C.M. Cooke, 1910 - (AMASTRIDAE)
- olaaensis, Columella olaaensis H.A. Pilsbry, 1926 - (VERTIGINIDAE)
- olainensis, Spixia olainensis (A. Doering, 1875) - (ODONTOSTOMIDAE)
- Olana, Subgenus Patella (Olana) H. Adams & A. Adams, 1854 (PATELLIDAE)
- olangoensis, Rissoa olangoensis G.T. Poppe, S.P. Tagaro & P. Stahlschmidt, 2015 - (RISSOIDAE)
- olangoensis, Lophiotoma olangoensis B.M. Olivera, 2002 - (TURRIDAE)
- olar, Laternula olar J.C. Jay, 1850 - syn of: Laternula rostrata (G.B. II Sowerby, 1839) - (LATERNULIDAE)
- olar, Anatina olar J.C. Jay, 1850 - syn of: Laternula rostrata (G.B. II Sowerby, 1839) - (MACTRIDAE)
- olavi, Colus olavi (O.A.L. Mörch, 1871 †) - (BUCCINIDAE) (FOSSIL)
- olavi morchii, Colus olavi morchii F.W. Harmer † - (BUCCINIDAE) (FOSSIL)
- Olcesia, Subgenus Tellina (Olcesia) Addicott, 1973 (TELLINIDAE) (FOSSIL)
- olchonensis, Godlewskia wrzesniowskii olchonensis (Kozhov, 1936) - (AMNICOLIDAE)
- olchonensis, Kobeltocochlea olchonensis W.A. Lindholm, 1909 - (LITHOGLYPHIDAE)
- olchovica, Astarte olchovica A. Petrov, 1982 - syn of: Astarte borealis (H.C.F. Schumacher, 1817) - (ASTARTIDAE)
- OLCOSTEPHANIDAE Haug, 1910 - Family (CEPHALOPODA-AMMONOIDEA-AMMONITIDA) (FOSSIL)
- Olcostephanus, Genus Olcostephanus Neumayr , 1875 (OLCOSTEPHANIDAE) (FOSSIL)
- oldhami, Bathytoma oldhami (E.A. Smith, 1899) - (BORSONIIDAE)
- oldhami, Corbula oldhami Hislop, 1859 † - (CORBULIDAE) (FOSSIL)
- oldhami, Cyclolobus oldhami (L. Waagen, 1872 †) - (CYCLOLOBIDAE) (FOSSIL)
- oldhami, Pachydiscus oldhami (Sharpe, 1855 †) - (DESMOCERATIDAE) (FOSSIL)
- oldhami, Euomphalus oldhami Reed, 1944 † - (EUOMPHALIDAE) (FOSSIL)
- oldhami, Schizostoma oldhami (Sowerby 1814 †) - (EUOMPHALIDAE) (FOSSIL)
- oldhami, Phylloceras oldhami L. Waagen, 1872 † - syn of: Cyclolobus oldhami (L. Waagen, 1872 †) - (PHYLLOCERATIDAE) (FOSSIL)
- oldhami, Terebra oldhami E.W. Vredenburg, 1921 † - (TEREBRIDAE) (FOSSIL)
- oldhami, Sinuitina oldhami (Portlock, 1843 †) - (TROPIDODISCIDAE) (FOSSIL)
- oldhami, Gemmula oldhami (L.C. Kiener, 1839) - (TURRIDAE)
- oldhamiana, Naninia oldhamiana T. Iredale, 1941 - (ARIOPHANTIDAE)
- oldhamiana, Montfortista oldhamiana (G. Nevill, 1869) - (FISSURELLIDAE)
- oldhamianus, Bulimus oldhamianus Hislop, 1859 † - (BULIMULIDAE) (FOSSIL)
- oldhamianus, Proptychites oldhamianus (L. Waagen, 1895 †) - (PROPTYCHITIDAE) (FOSSIL)
- oldi, Oliva irisans oldi R.F. Zeigler, 1969 - (OLIVIDAE)
- oldi, Tricornis oldi (W.K. Emerson, 1965) - (STROMBIDAE)
- oldroydae, Lirobittium oldroydae (P. Bartsch, 1911) - (CERITHIIDAE)
- oldroydae, Gibberula oldroydae H.K. Jordan, 1926 - syn of: Gibberula subtrigona (P.P. Carpenter, 1864) - (CYSTISCIDAE)
- oldroydae, Melanella oldroydae P. Bartsch, 1917 - syn of: Melanella micans (H.F. Carpenter, 1865) - (EULIMIDAE)
- oldroydae, Alvania oldroydae P. Bartsch, 1911 - (RISSOIDAE)
- oldroyde, Chilina oldroyde W.B. Marshall, 1924 - syn of: Chilina dombeiana (J.G. Bruguière, 1789) - (CHILINIDAE)
- oldroydi, Acteocina oldroydi W.H. Dall, 1925 - (ACTEOCINIDAE)
- oldroydi, Barleeia oldroydi P. Bartsch, 1920 - (BARLEEIIDAE)
- oldroydi, Glyptaesopus oldroydi (R. Arnold, 1903) - (BORSONIIDAE)
- oldroydi, Cardiomya oldroydi W.H. Dall in I.M. Oldroyd, 1924 - syn of: Cardiomya pectinata (Carpenter, 1865) - (CUSPIDARIIDAE)
- oldroydi, Cardiomya oldroydi W.H. Dall, 1924 - syn of: Cardiomya pectinata (Carpenter, 1865) - (CUSPIDARIIDAE)
- oldroydi, Melanella oldroydi P. Bartsch, 1917 - syn of: Melanella micans (H.F. Carpenter, 1865) - (EULIMIDAE)
- oldroydi, Mangelia oldroydi R. Arnold, 1903 - (MANGELIIDAE)
- oldroydi, Babelomurex oldroydi (I.M. Oldroyd, 1929) - (MURICIDAE)
- oldroydi, Hanleyella oldroydi (W.H. Dall, 1919) - (PROTOCHITONIDAE)
- oldroydi, Vitrinella oldroydi P. Bartsch, 1907 - (TORNIDAE)
- Oldroydia, Genus Oldroydia W.H. Dall, 1894 (LEPTOCHITONIDAE)
- oldroydii, Calinaticina oldroydii (W.H. Dall, 1897) - (NATICIDAE)
- oldroydii, Atrina oldroydii (W.H. Dall, 1901) - (PINNIDAE)
- oldroydii, Cyrtopinna oldroydii W.H. Dall, 1901 - syn of: Atrina oldroydii (W.H. Dall, 1901) - (PINNIDAE)
- olea, Pila olea L.A. Reeve, 1856 - (AMPULLARIIDAE)
- Olea, Genus Olea Agersborg, 1923 (LIMAPONTIIDAE)
- oleacea, Monilearia oleacea (R.J. Shuttleworth, 1852) - (COCHLICELLIDAE)
- oleacea, Zierliana oleacea (L.A. Reeve, 1844) - (COSTELLARIIDAE)
- oleacea, Melanella oleacea (J.D. Kurtz & W. Stimpson, 1851) - (EULIMIDAE)
- oleacea, Mitra oleacea L.A. Reeve, 1844 - syn of: Zierliana oleacea (L.A. Reeve, 1844) - (MITRIDAE)
- oleacea, Laevoleacina oleacea (G.P. Deshayes, 1830) - (OLEACINIDAE)
- oleacea, Archiminolia oleacea (C. Hedley & W.F. Petterd, 1906) - (SOLARIELLIDAE)
- oleacea, Monilea oleacea C. Hedley & W.F. Petterd, 1906 - syn of: Archiminolia oleacea (C. Hedley & W.F. Petterd, 1906) - (TROCHIDAE)
- oleacea, Torrecoptis oleacea C. de la Torre & P. Bartsch, 1972 - (UROCOPTIDAE)
- oleacina, Drillia oleacina (W.H. Dall, 1881) - (DRILLIIDAE)
- Oleacina, Genus Oleacina P.F. Rφding, 1798 (OLEACINIDAE)
- oleacina, Videna oleacina (C.G. Semper, 1874) - (TROCHOMORPHIDAE)
- oleacina, Portlandia oleacina W.H. Dall, 1916 - syn of: Portlandia intermedia (G.O. Sars, 1865) - (YOLDIIDAE)
- OLEACINIDAE H. & A. Adams, 1855 - Family (GASTROPODA-HETEROBRANCHIA-PULMONATA-STYLOMMATOPHORA)
- oleagina, Nerita oleagina L.A. Reeve, 1855 - syn of: Nerita undata C. Linnaeus, 1758 - (NERITIDAE)
- oleana, Cyanocyclas oleana W.B. Marshall, 1924 - syn of: Cyanocyclas paranacensis (D'Orbigny, 1835) - (CYRENIDAE)
- olearia, Brookula olearia R.S. Absalão & A. Pimenta, 2005 - (SEGUENZIOIDEA (unassigned))
- Olearia, syn of: Subgenus Turbo (Halopsephus) H.A. Rehder, 1943 (TURBINIDAE)
- olearium, Buccinum olearium C. Linnaeus, 1758 - syn of: Tonna galea (C. Linnaeus, 1758) - (BUCCINIDAE)
- olearium, Buccinum olearium P.F. Röding, 1798 - syn of: Monoplex pilearis (C. Linnaeus, 1758) - (BUCCINIDAE)
- olearium, Murex olearium C. Linnaeus, 1758 - syn of: Ranella olearium (C. Linnaeus, 1758) - (MURICIDAE)
- olearium, Ranella olearium (C. Linnaeus, 1758) - (RANELLIDAE)
- olearium, Monoplex olearium P.F. Röding, 1798 - syn of: Monoplex pilearis (C. Linnaeus, 1758) - (RANELLIDAE)
- olearium, Tonna olearium J.G. Bruguière, 1789 - syn of: Tonna canaliculata (C. Linnaeus, 1758) - (TONNIDAE)
- olearium, Tonna olearium L.W. Dillwyn, 1817 - syn of: Tonna canaliculata (C. Linnaeus, 1758) - (TONNIDAE)
- olearium, Tonna olearium C. Linnaeus, 1758 - syn of: Tonna galea (C. Linnaeus, 1758) - (TONNIDAE)
- olearium atlantica, Ranella olearium atlantica T.A. de M. Monterosato, 1890 - (RANELLIDAE)
- olearium barcellosi, Ranella olearium barcellosi H.R. Matthews, E. de C. Rios & A.C. dos Santos Coelho, 1973 - (RANELLIDAE)
- olearium cumingii, Tonna olearium cumingii S.C.T. Hanley in L.A. Reeve, 1849 - syn of: Tonna cumingii (S.C.T. Hanley) - (TONNIDAE)
- olearium deshayesii, Tonna olearium deshayesii L.A. Reeve, 1849 - syn of: Tonna deshayesii (L.A. Reeve, 1849) - (TONNIDAE)
- olearium testardi, Tonna olearium testardi R.P. Montrouzier, 1863 - syn of: Tonna cumingii (S.C.T. Hanley) - (TONNIDAE)
- olearius, Turbo olearius C. Linnaeus, 1758 - syn of: Turbo marmoratus C. Linnaeus, 1758 - (TURBINIDAE)
- olearum, Abida olearum É.A.A. Locard, 1894 - syn of: Abida secale (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- oleatus, Kalidos oleatus (C.M.F. Ancey, 1902) - (ARIOPHANTIDAE)
- oleica, Taringa oleica J.A. Ortea, A.M. Pérez & E.M. Llera, 1982 - (DISCODORIDIDAE)
- oleiniki, Jaspidiconus oleiniki E.J. Petuch, 2013 - syn of: Conasprella jaspidea (J.F. Gmelin, 1791) - (CONIDAE)
- oleiniki, Scaphella oleiniki E.J. Petuch, 1994 † - (VOLUTIDAE) (FOSSIL)
- oleinikovi, Sutchanites oleinikovi Zakharov, 1994 † - (XENODISCIDAE) (FOSSIL)
- oleivorus, Mycetopus oleivorus P.M. Heude, 1877 - syn of: Solenaia oleivorus (P.M. Heude, 1877) - (MYCETOPODIDAE)
- oleivorus, Solenaia oleivorus (P.M. Heude, 1877) - (UNIONIDAE)
- olene, Sanmartinoceras olene (J.E. Tenison-Woods, 1883 †) - (OPPELIIDAE) (FOSSIL)
- olenekense, Gymnotoceras olenekense Dagys & Konstantinov, 1986 † - (BEYRICHITIDAE) (FOSSIL)
- olenekensis, Boreiobakevellia olenekensis Kurushin, 1980 † - (BAKEVELLIIDAE) (FOSSIL)
- olenekensis, Frechitoides olenekensis Konstantinov, 1987 † - (BEYRICHITIDAE) (FOSSIL)
- olenekensis, Anaxenaspis olenekensis Dagis & Ermakova, 1990 † - (FLEMINGITIDAE) (FOSSIL)
- olenekensis, Grambergia olenekensis A.M. Popov, 1961 † - (LONGOBARDITIDAE) (FOSSIL)
- olenekensis, Taimyrodon olenekensis (Kiparisova, 1937 †) - (MALLETIIDAE) (FOSSIL)
- olenekensis, Nordophiceras olenekensis A.M. Popov, 1961 † - syn of: Nordophiceras karpinskii (Mojsisovics, 1886 †) - (MEEKOCERATIDAE) (FOSSIL)
- olenekensis, Posidonia olenekensis A.M. Popov, 1964 † - (POSIDONIIDAE) (FOSSIL)
- olenekensis, Pleuronautilus olenekensis Zakharov, 1978 † - syn of: Phaedrysmocheilus subaratus (Keyserling, 1847 †) - (TAINOCERATIDAE) (FOSSIL)
- Olenekoceras, Genus Olenekoceras Dagys & Ermakova, 1986 (SIBIRITIDAE) (FOSSIL)
- oleniana, Palaeomutela oleniana Gusev † - (PALAEOMUTELIDAE) (FOSSIL)
- Olenikites, Genus Olenikites Hyatt , 1900 (SIBIRITIDAE) (FOSSIL)
- oleosa, Semilimax oleosa E.C. Von Martens, 1895 - (VITRINIDAE)
- Olequahia, Genus Olequahia Stewart, 1927 (BURSIDAE) (FOSSIL)
- oleshkoi, Intornites oleshkoi Archipov, 1974 † - (LONGOBARDITIDAE) (FOSSIL)
- olfersii, Lithopoma tectum olfersii (R.A. Philippi, 1846) - (TURBINIDAE)
- olga, Venericardia olga W.C. Mansfield, 1939 † - (CARDITIDAE) (FOSSIL)
- Olgaconcha, syn of: Genus Ifremeria P. Bouchet & A. Warιn, 1991 (PROVANNIDAE)
- olgae, Pseudancylastrum olgae Y.I. Starobogatov, 1989 - (ACROLOXIDAE)
- olgae, Felimare olgae (J.A. Ortea & J.J. Bacallado, 2007) - (CHROMODORIDIDAE)
- olgae, Conus olgae J.J. Bacallado, J. Espinosa & J.A. Ortea, 2007 - syn of: Purpuriconus havanensis (C.G. Aguayo & I. Pérez Farfante, 1947) - (CONIDAE)
- olgae, Pusia olgae C.N. Cate, 1963 - syn of: Pusia tusum (L.A. Reeve, 1845) - (COSTELLARIIDAE)
- olgae, Entocolax olgae Nekhaev, 2016 - (EULIMIDAE)
- olgae, Mesohedenstroemia olgae Zakharov & Moussavi Abnavi, 2013 † - (HEDENSTROEMIIDAE) (FOSSIL)
- olgae, Onchidoris olgae (A.V. Martynov, T.A. Korshunova, N. Sanamyan & K. Sanamyan, 2009) - (ONCHIDORIDIDAE)
- olgae, Adalaria olgae A.V. Martynov, T.A. Korshunova, N. Sanamyan & K. Sanamyan, 2009 - syn of: Onchidoris olgae (A.V. Martynov, T.A. Korshunova, N. Sanamyan & K. Sanamyan, 2009) - (ONCHIDORIDIDAE)
- olgae, Palaeomutela olgae Gusev † - (PALAEOMUTELIDAE) (FOSSIL)
- olgae, Skenea olgae W. Segers, F. Swinnen & R. De Prins, 2009 - (SKENEIDAE)
- olgana, Basedowena olgana G.A. Solem, 1993 - (CAMAENIDAE)
- Olgasolaris, Genus Olgasolaris L.A. Beck, 1992 (PHENACOLEPADIDAE)
- olgensis, Leptopecten olgensis W.C. Mansfield, 1939 † - (PECTINIDAE) (FOSSIL)
- olgiatiana, Cypraea tigris olgiatiana L. Bozzetti, 2009 - (CYPRAEIDAE)
- olgiatii, Conus olgiatii (L. Bozzetti, 2007) - (CONIDAE)
- olgiatii, Taranteconus olgiatii L. Bozzetti, 2007 - syn of: Conus olgiatii (L. Bozzetti, 2007) - (CONIDAE)
- oli, Turcomilax oli A. Wiktor, F. Naggs & G.P. Gupta, 1999 - (LIMACIDAE)
- Olianatrivia, Genus Olianatrivia Dolin, Biosca-Munts & Parcerisa, 2013 (PEDICULARIIDAE) (FOSSIL)
- oligista, Effusa oligista H.A. Pilsbry & A.A. Olsson, 1953 - syn of: Pomacea planorbula (R.A. Philippi, 1852) - (AMPULLARIIDAE)
- oligoasper, Rhinoclavis oligoasper F. Sacco, 1895 † - (CERITHIIDAE) (FOSSIL)
- oligobessa, Planctoteuthis oligobessa A.T. Young, 1972 - (CHIROTEUTHIDAE)
- oligocaenica, Parvisipho oligocaenica R. Marquet, Lenaerts & Laporte, 2016 † - (BUCCINIDAE) (FOSSIL)
- oligocaenica, Cima oligocaenica P. Lozouet, 2015 - (CIMIDAE)
- oligocalantica, Semicassis oligocalantica E.W. Vredenburg, 1925 † - (CASSIDAE) (FOSSIL)
- oligocanthus, Murex oligocanthus F.M. Euthyme, 1889 - syn of: Triplex brunneus (J.H.F. Link, 1807) - (MURICIDAE)
- oligocenica, Martesia oligocenica C.J. Maury, 1912 † - (PHOLADIDAE) (FOSSIL)
- oligocenica, Terebra subtessellata oligocenica E.W. Vredenburg, 1925 - (TEREBRIDAE)
- oligocenica, Palindonaia oligocenica R. Marquet, Lenaerts & Laporte, 2012 † - (UNIONIDAE) (FOSSIL)
- oligocenicus, Hippochrenes oligocenicus Lefevre, 1881 † - (ROSTELLARIIDAE) (FOSSIL)
- Oligoceras, Genus Oligoceras Schulze, 1879 (ONCOCERIDA (unassigned)) (FOSSIL)
- oligochilus, Ceratosiphon oligochilus (J. Gardner, 1875 †) - (APORRHAIDAE) (FOSSIL)
- oligocotyla, Pneumodermopsis oligocotyla A.L. Massy, 1917 - (PNEUMODERMATIDAE)
- oligodonta, Chondrina oligodonta R. Del Prete, 1879 - (CHONDRINIDAE)
- Oligodontella, Genus Oligodontella Gusev, 1963 (PALAEOMUTELIDAE) (FOSSIL)
- oligogyra, Atlanta oligogyra J.J. Tesch, 1906 - (ATLANTIDAE)
- oligogyrus, Ena oligogyrus O. Böttger, 1898 - (ENIDAE)
- oligoina, Pseudodaphnella oligoina C. Hedley, 1922 - (RAPHITOMIDAE)
- oligolaevis, Corbula carinata oligolaevis F. Sacco, 1901 † - (CORBULIDAE) (FOSSIL)
- oligolepis, Pecten oligolepis J. Brown & H.A. Pilsbry, 1913 † - syn of: Cyclopecten oligolepis (J. Brown & H.A. Pilsbry, 1913 †) - (PECTINIDAE) (FOSSIL)
- oligolepis, Cyclopecten oligolepis (J. Brown & H.A. Pilsbry, 1913 †) - (PROPEAMUSSIIDAE) (FOSSIL)
- Oligolimax, Genus Oligolimax P. Fischer, 1878 (VITRINIDAE)
- Oligomeria, Genus Oligomeria Y.I. Galkin & A.N. Golikov, 1985 (SEGUENZIIDAE)
- oligomesa, Liocallonia oligomesa (H.A. Pilsbry, 1903) - (UROCOPTIDAE)
- oligomiocaenica, Praescissurella oligomiocaenica P. Lozouet, 1998 † - (SCISSURELLIDAE) (FOSSIL)
- oligomiocenica, Mitrolumna oligomiocenica P. Lozouet, 2015 - (MITROMORPHIDAE)
- oligomitra, Terebra oligomitra W.H. Dall, 1895 † - (TEREBRIDAE) (FOSSIL)
- oligomphala, Phasianella oligomphala H.A. Pilsbry, 1895 - syn of: Tricolia variabilis (W.H. Pease, 1861) - (PHASIANELLIDAE)
- oligopleura, Pleuroxia oligopleura R. Tate, 1894 - (CAMAENIDAE)
- oligopleura, Nerita oligopleura W.H. Dall & Oschner, 1928 † - (NERITIDAE) (FOSSIL)
- oligopleura, Turbonilla oligopleura J.C. Melvill, 1910 - (PYRAMIDELLIDAE)
- oligopleura, Zebinella oligopleura (W.P. Woodring, 1928 †) - (RISSOINIDAE) (FOSSIL)
- oligopleura, Trivellona paucicostata oligopleura L. Dolin, 2001 - (TRIVIIDAE)
- oligopleura numba, Pleuroxia oligopleura numba T. Iredale, 1939 - (CAMAENIDAE)
- oligopleuris, Diplommatina oligopleuris W.T. Blanford, 1868 - (DIPLOMMATINIDAE)
- Oligopleurodiscus, Subgenus Pleurodiscoides (Oligopleurodiscus) Nordsieck, 2014 (PLEURODISCIDAE) (FOSSIL)
- oligopolitum, Sinum oligopolitum (F. Sacco, 1890 †) - (NATICIDAE) (FOSSIL)
- Oligoptycha, Genus Oligoptycha Meek, 1876 (RINGICULIDAE) (FOSSIL)
- Oligoptychia, syn of: Genus Idyla H. Adams & A. Adams, 1855 (CLAUSILIIDAE)
- oligoptyx, Chilina fulgurata oligoptyx H.A. Pilsbry, 1911 - (CHILINIDAE)
- oligoptyx, Thaumatoptyx oligoptyx H. Nordsieck, 2003 - (CLAUSILIIDAE)
- oligoptyx, Poteria caymanensis oligoptyx H.A. Pilsbry, 1942 - (NEOCYCLOTIDAE)
- Oligoptyxis, Genus Oligoptyxis Pchelintsev, 1953 (OPISTHOBRANCHIA (unassigned)) (FOSSIL)
- oligosarcus, Arcestes oligosarcus Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- Oligospira, Genus Oligospira C.M.F. Ancey, 1887 (ACAVIDAE)
- oligospira, Loxonema oligospira Winchell, 1863 † - syn of: Leptoptygma oligospira (Winchell, 1863 †) - (LOXONEMATIDAE) (FOSSIL)
- oligospira, Leptoptygma oligospira (Winchell, 1863 †) - (SOLENISCIDAE) (FOSSIL)
- oligostata, Erato oligostata W.H. Dall, 1902 - (TRIVIIDAE)
- oligostigma, Benthonellania oligostigma P. Bouchet & A. Warén, 1993 - (RISSOIDAE)
- oligostira, Siphonalia oligostira R. Tate, 1891 - syn of: Penion sulcatus mandarinus oligostira R. Tate, 1891 - (BUCCINIDAE)
- oligostirus, Charonia oligostirus R. Tate, 1888 † - (RANELLIDAE) (FOSSIL)
- oligostriatum, Stellaxis oligostriatum F. Sacco, 1896 † - (ARCHITECTONICIDAE) (FOSSIL)
- oligostropha, Achatina oligostropha A.E. Reuss in A.E. Reuss & Meyer, 1849 † - syn of: Pseudoleacina oligostropha (A.E. Reuss in A.E. Reuss & Meyer, 1849 †) - (ACHATINIDAE) (FOSSIL)
- oligostropha, Pseudoleacina oligostropha (A.E. Reuss in A.E. Reuss & Meyer, 1849 †) - (OLEACINIDAE) (FOSSIL)
- oligostropha, Glandina oligostropha A.E. Reuss in A.E. Reuss & Meyer, 1849 † - syn of: Pseudoleacina oligostropha (A.E. Reuss in A.E. Reuss & Meyer, 1849 †) - (SPIRAXIDAE) (FOSSIL)
- oligostylus, Plekocheilus oligostylus H.A. Pilsbry, 1939 - (AMPHIBULIMIDAE)
- Oligostylus, Subgenus Eucalodium (Oligostylus) H.A. Pilsbry, 1895 (UROCOPTIDAE)
- oligosulculatus, Callochiton oligosulculatus P. Kaas & R.A. Van Belle, 1985 - (CALLOCHITONIDAE)
- Oligothychia, syn of: Genus Idyla H. Adams & A. Adams, 1855 (CLAUSILIIDAE)
- Oligotoma, syn of: Genus Asthenotoma G.F. Harris & H.W. Burrows, 1891 (BORSONIIDAE)
- oligotropha, Veleropilina oligotropha (E.J. Rokop, 1972) - (NEOPILINIDAE)
- oligoturritus, Scaphander oligoturritus F. Sacco, 1897 † - (SCAPHANDRIDAE) (FOSSIL)
- oligoza, Biomphalaria oligoza W.L. Paraense, 1975 - (PLANORBIDAE)
- Oligozaptyx, Genus Oligozaptyx H.A. Pilsbry, 1905 (CLAUSILIIDAE)
- Oligyra, syn of: Genus Olygyra T. Say, 1818 (HELICINIDAE)
- olimpica, Corbula olimpica A. da Costa, 1829 - syn of: Corbula gibba (A.G. Olivi, 1792) - (CORBULIDAE)
- olimpica, Tellina olimpica A. da Costa, 1829 - syn of: Corbula gibba (A.G. Olivi, 1792) - (TELLINIDAE)
- Olingechiton, Genus Olingechiton Bergenhayn, 1943 (SCANOCHITONIDAE) (FOSSIL)
- Olinodia, syn of: Genus Naesiotus J.A. Albers, 1850 (BULIMULIDAE)
- oliphantensis, Corbicula oliphantensis A. Craven, 1880 - syn of: Corbicula africana (C.F.F. von Krauss, 1848) - (CYRENIDAE)
- olisiponensis, Costagyra olisiponensis (Sharpe, 1850 †) - (GRYPHAEIDAE) (FOSSIL)
- olisippensis, Candidula olisippensis G. Servain, 1880 - syn of: Candidula olissipensis (G. Servain, 1880) - (HYGROMIIDAE)
- olissipensis, Candidula olissipensis (G. Servain, 1880) - (HYGROMIIDAE)
- olita, Darellia olita S.S. Buckman, 1889 † - syn of: Darellia polita S.S. Buckman, 1889 † - (AMMONOIDEA (unassigned)) (FOSSIL)
- oliva, Bulla oliva J.F. Gmelin, 1791 - syn of: Cylichna cylindracea (T. Pennant, 1777) - (BULLIDAE)
- oliva, Cylichna oliva J.F. Gmelin, 1791 - syn of: Cylichna cylindracea (T. Pennant, 1777) - (CYLICHNIDAE)
- oliva, Thordisa oliva G.L. Chan & T.M. Gosliner, 2007 - (DISCODORIDIDAE)
- oliva, Melampus oliva A.V.M.D. D'Orbigny - syn of: Melampus bullaoides (G. Montagu, 1808) - (ELLOBIIDAE)
- oliva, Kuonamkaella oliva Gubanov & al., 2004 † - (HELCIONELLIDAE) (FOSSIL)
- oliva, Mitromorpha oliva M. Chino & P. Stahlschmidt, 2009 - (MITROMORPHIDAE)
- oliva, Ennucula oliva R.N. Kilburn, 1999 - (NUCULIDAE)
- Oliva, Genus Oliva J.G. Bruguiθre, 1789 (OLIVIDAE)
- oliva, Oliva oliva (C. Linnaeus, 1758) - (OLIVIDAE)
- oliva, Tambja oliva K.B. Meyer, 1977 - (POLYCERIDAE)
- oliva, Crassispira oliva F. Fernandes, E. Rolán & J. Otero-Schmidt, 1995 - (PSEUDOMELATOMIDAE)
- oliva, Voluta oliva L.W. Dillwyn, 1817 - syn of: Oliva oliva (C. Linnaeus, 1758) - (VOLUTIDAE)
- oliva algida, Oliva oliva algida E.G. Vanatta, 1915 - (OLIVIDAE)
- oliva broderipi, Oliva oliva broderipi A.M.P. Ducros De St.Germain, 1857 - (OLIVIDAE)
- oliva candida, Oliva oliva candida J.B.P.A. Lamarck, 1811 - (OLIVIDAE)
- oliva dealbata, Oliva oliva dealbata P.F. Röding, 1798 - (OLIVIDAE)
- oliva fenestrata, Oliva oliva fenestrata C.W. Johnson, 1915 - syn of: Oliva oliva (C. Linnaeus, 1758) - (OLIVIDAE)
- oliva flaveola, Oliva oliva flaveola P.L. Duclos, 1835 - (OLIVIDAE)
- oliva gratiosa, Oliva oliva gratiosa E.G. Vanatta, 1915 - (OLIVIDAE)
- oliva jayana, Oliva oliva jayana A.M.P. Ducros De St.Germain, 1857 - (OLIVIDAE)
- oliva lacteana, Oliva oliva lacteana P. Dautzenberg, 1927 - syn of: Oliva tigridella lacteana P. Dautzenberg, 1927 - (OLIVIDAE)
- oliva longispira, Oliva oliva longispira F.G. Bridgman, 1906 - (OLIVIDAE)
- oliva samarensis, Oliva oliva samarensis C.W. Johnson, 1915 - syn of: Oliva tigridella samarensis C.W. Johnson, 1915 - (OLIVIDAE)
- oliva taeniata, Oliva oliva taeniata J.H.F. Link, 1807 - (OLIVIDAE)
- olivacea, Ampelita sepulchralis olivacea H.A. Pilsbry, 1890 - (ACAVIDAE)
- olivacea, Achatinellastrum vulpina olivacea J.R. Bourguignat, 1880 - (ACHATINELLIDAE)
- olivacea, Aeolidia olivacea J. Alder & A. Hancock, 1842 - syn of: Cuthona foliata (E. Forbes & J. Goodsir, 1839) - (AEOLIDIIDAE)
- olivacea, Carelia olivacea W.H. Pease, 1866 - (AMASTRIDAE)
- olivacea, Pomacea olivacea J.B. von Spix, 1827 - syn of: Pomacea urceus olivacea (J.B. von Spix, 1827) - (AMPULLARIIDAE)
- olivacea, Pomacea urceus olivacea (J.B. von Spix, 1827) - (AMPULLARIIDAE)
- olivacea, Pisinna olivacea (G.R. von Frauenfeld, 1867) - (ANABATHRIDAE)
- olivacea, Dolabrifera olivacea W.H. Pease, 1860 - syn of: Dolabrifera dolabrifera (P.C.A.S.L. Rang, 1828) - (APLYSIIDAE)
- olivacea, Arca olivacea L.A. Reeve, 1844 - syn of: Estellacar olivacea (L.A. Reeve, 1844) - (ARCIDAE)
- olivacea, Arene olivacea (W.H. Dall, 1918) - (ARENEIDAE)
- olivacea, Retimohnia olivacea P. Bartsch, 1929 - syn of: Plicifusus olivaceus (C.W.S. Aurivillius, 1885) - (BUCCINIDAE)
- olivacea, Flammulina olivacea H.H. Suter, 1892 - (CHAROPIDAE)
- olivacea, Chilina olivacea W.B. Marshall, 1924 - (CHILINIDAE)
- olivacea, Erronea olivacea J.B.P.A. Lamarck, 1810 - syn of: Erronea ovum (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- olivacea, Cyrena olivacea P.P. Carpenter, 1857 - syn of: Polymesoda mexicana (W.J. Broderip & G.B. I Sowerby, 1829) - (CYRENIDAE)
- olivacea, Doris olivacea W. Stimpson, 1855 - (DORIDIDAE)
- olivacea, Doris olivacea A.E. Verrill, 1900 - (DORIDIDAE)
- olivacea, Eatoniella olivacea (F.W. Hutton, 1882) - (EATONIELLIDAE)
- olivacea, Facelina olivacea W. Macnae, 1954 - (FACELINIDAE)
- olivacea, Cuthona olivacea J. Alder & A. Hancock, 1842 - syn of: Cuthona foliata (E. Forbes & J. Goodsir, 1839) - (FIONIDAE)
- olivacea, Helix olivacea A. Risso, 1826 - syn of: Cepaea nemoralis (C. Linnaeus) - (HELICIDAE)
- olivacea, Polymita venusta olivacea C. de la Torre, 1950 - (HELMINTHOGLYPTIDAE)
- olivacea, Marstonia olivacea (H.A. Pilsbry, 1895) - (HYDROBIIDAE)
- olivacea, Littorina obtusata olivacea P. Dautzenberg & H. Fischer, 1915 - (LITTORINIDAE)
- olivacea, Maizania olivacea J.R. Bourguignat - (MAIZANIIDAE)
- olivacea, Gaza olivacea J.F. Quinn, 1991 - (MARGARITIDAE)
- olivacea, Mitra olivacea H.E. Anton, 1839 - syn of: Strigatella tristis (W.J. Broderip, 1836) - (MITRIDAE)
- olivacea, Montacutona olivacea T. Habe, 1959 - (MONTACUTIDAE)
- olivacea, Cellana olivacea F.W. Hutton - syn of: Cellana radians perana A.W.B. Powell, 1979 - (NACELLIDAE)
- olivacea, Nassa olivacea J.G. Bruguière, 1789 - syn of: Nassarius olivaceus (J.G. Bruguière, 1789) - (NASSARIIDAE)
- olivacea, Zeuxis olivacea J.G. Bruguière, 1789 - syn of: Nassarius olivaceus (J.G. Bruguière, 1789) - (NASSARIIDAE)
- olivacea, Estellacar olivacea (L.A. Reeve, 1844) - (NOETIIDAE)
- olivacea, Ledellina olivacea Z.A. Filatova & A.A. Schileyko, 1984 - (NUCULANIDAE)
- olivacea, Oliva olivacea F.P. Marrat, 1871 - syn of: Oliva tisiphona P.L. Duclos, 1844 - (OLIVIDAE)
- olivacea, Onchidoris olivacea (A.E. Verrill, 1900) - (ONCHIDORIDIDAE)
- olivacea, Oxynoe olivacea C.S. Rafinesque, 1814 - (OXYNOIDAE)
- olivacea, Patella olivacea J.F. Gmelin, 1791 - syn of: Patella rustica C. Linnaeus, 1758 - (PATELLIDAE)
- olivacea, Pharella olivacea (W. Metcalfe, 1852) - (PHARIDAE)
- olivacea, Planaxis olivacea A. Risso, 1826 † - syn of: Tritia corniculum (A.G. Olivi, 1792 †) - (PLANAXIDAE) (FOSSIL)
- olivacea, Nuttallia olivacea (J.C. Jay, 1857) - (PSAMMOBIIDAE)
- olivacea, Hiatula olivacea C.E. Lischke, 1874 - syn of: Nuttallia japonica (L.A. Reeve, 1857) - (PSAMMOBIIDAE)
- olivacea, Nuttallia olivacea A.W. Grabau & S.G. King, 1928 - syn of: Nuttallia ezonis J.T. Kuroda & T. Habe in T. Habe, 1955 - (PSAMMOBIIDAE)
- olivacea, Knefastia olivacea (I, 1833) - (PSEUDOMELATOMIDAE)
- olivacea, Rissoa olivacea C. Hedley, 1907 - syn of: Pisinna kershawi (J.E. Tenison-Woods, 1878) - (RISSOIDAE)
- olivacea, Rissoina olivacea F.W. Hutton, 1884 - syn of: Eatoniella olivacea (F.W. Hutton, 1882) - (RISSOINIDAE)
- olivacea, Tritonia olivacea L.S.R. Bergh, 1905 - (TRITONIIDAE)
- olivacea, Marionia olivacea K. Baba, 1937 - (TRITONIIDAE)
- olivacea, Gibbula olivacea H.E. Anton, 1839 - syn of: Gibbula adriatica (R.A. Philippi, 1844) - (TROCHIDAE)
- olivacea, Uvanilla olivacea (W. Wood, 1828) - (TURBINIDAE)
- olivacea, Parreysia olivacea B. Prashad, 1930 - (UNIONIDAE)
- olivacea, Policordia olivacea J. Poutiers & F.R. Bernard, 1995 - (VERTICORDIIDAE)
- olivacea, Paludina olivacea G.B. I Sowerby, 1825 - syn of: Lanistes ovum F.H. Troschel, 1845 - (VIVIPARIDAE)
- olivacea baldwini, Carelia olivacea baldwini C.M. Cooke, 1931 - (AMASTRIDAE)
- olivacea impressa, Pisinna olivacea impressa (F.W. Hutton, 1885) - (ANABATHRIDAE)
- olivacea infrequens, Carelia olivacea infrequens C.M. Cooke, 1931 - (AMASTRIDAE)
- olivacea moloaaensis, Carelia olivacea moloaaensis C.M. Cooke & Y. Kondo, 1952 - (AMASTRIDAE)
- olivacea priggei, Carelia olivacea priggei C.M. Cooke, 1931 - (AMASTRIDAE)
- olivacea proopinquella, Carelia olivacea proopinquella C.M. Cooke, 1931 - (AMASTRIDAE)
- olivacea variabilis, Carelia olivacea variabilis W.H. Pease, 1866 - (AMASTRIDAE)
- olivaceae, Astraea olivaceae W. Wood, 1828 - syn of: Uvanilla olivacea (W. Wood, 1828) - (TURBINIDAE)
- olivaceostrigata, Solariella olivaceostrigata (J.B.P.A. Lamarck, 1822) - (SOLARIELLIDAE)
- olivaceum, Buccinum olivaceum J.G. Bruguière, 1789 - syn of: Nassarius olivaceus (J.G. Bruguière, 1789) - (BUCCINIDAE)
- olivaceum, Clithon olivaceum (C.A. Récluz, 1842) - (NERITIDAE)
- olivaceum, Zaphysema olivaceum (H.B. Baker, 1934) - (SAGDIDAE)
- olivaceus, Lanistes olivaceus A. Mozley, 1939 - (AMPULLARIIDAE)
- olivaceus, Lanistes olivaceus G.B. I Sowerby, 1825 - syn of: Lanistes ovum F.H. Troschel, 1845 - (AMPULLARIIDAE)
- olivaceus, Plicifusus olivaceus (C.W.S. Aurivillius, 1885) - (BUCCINIDAE)
- olivaceus, Retifusus olivaceus C.W.S. Aurivillius, 1885 - syn of: Plicifusus olivaceus (C.W.S. Aurivillius, 1885) - (BUCCINIDAE)
- olivaceus, Rhyssoplax olivaceus (L. Spengler, 1797) - (CHITONIDAE)
- olivaceus, Conus olivaceus L.C. Kiener, 1845 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- olivaceus, Conus olivaceus C.U.A. von Salis-Marschlins, 1793 - syn of: Lautoconus ventricosus (J.F. Gmelin, 1791) - (CONIDAE)
- olivaceus, Melampus olivaceus P.P. Carpenter, 1857 - (ELLOBIIDAE)
- olivaceus, Mastus olivaceus (L. Pfeiffer, 1846) - (ENIDAE)
- olivaceus, Eubranchus olivaceus (O'Donoghue, 1922) - (EUBRANCHIDAE)
- olivaceus, Fusus olivaceus C.W.S. Aurivillius, 1885 - syn of: Plicifusus olivaceus (C.W.S. Aurivillius, 1885) - (FASCIOLARIIDAE)
- olivaceus, Phanerophthalmus olivaceus C.G. Ehrenberg, 1828 - syn of: Phanerophthalmus smaragdinus (W.P.E.S. Rüppell & F.S. Leuckart, 1830) - (HAMINOEIDAE)
- olivaceus, Margarites olivaceus (T. Brown, 1827) - (MARGARITIDAE)
- olivaceus, Musculus olivaceus W.H. Dall, 1916 - syn of: Musculus discors (C. Linnaeus, 1767) - (MYTILIDAE)
- olivaceus, Zeuxis olivaceus (Bruguiére, 1789) - (NASSARIIDAE)
- olivaceus, Nassarius olivaceus (J.G. Bruguière, 1789) - (NASSARIIDAE)
- olivaceus, Zeuxis olivaceus J.G. Bruguière, 1789 - syn of: Nassarius olivaceus (J.G. Bruguière, 1789) - (NASSARIIDAE)
- olivaceus, Zeuxis olivaceus F.P. Marrat, 1877 - syn of: Nassarius olivaceus (J.G. Bruguière, 1789) - (NASSARIIDAE)
- olivaceus, Planorbis olivaceus J.B. von Spix, 1827 - syn of: Biomphalaria glabrata (T. Say, 1818) - (PLANORBIDAE)
- olivaceus, Seraphs olivaceus A.E.M. Cossmann, 1889 † - (SERAPHSIDAE) (FOSSIL)
- olivaceus, Monophorus olivaceus (W.H. Dall, 1889) - (TRIPHORIDAE)
- olivaceus, Turbo olivaceus T. Brown, 1827 - syn of: Margarites olivaceus (T. Brown, 1827) - (TURBINIDAE)
- olivaceus, Diplosolenodes olivaceus (R.E.C. Stearns, 1871) - (VERONICELLIDAE)
- olivaceus affinis, Rhyssoplax olivaceus affinis A. Issel, 1869 - syn of: Chiton affinis A. Issel, 1869 - (CHITONIDAE)
- olivaceus affinis, Chiton olivaceus affinis A. Issel, 1869 - syn of: Chiton affinis A. Issel, 1869 - (CHITONIDAE)
- olivaceus ambiguus, Lanistes olivaceus ambiguus E.C. Von Martens, 1866 - syn of: Lanistes ambiguus (E.C. Von Martens, 1866) - (AMPULLARIIDAE)
- olivaceus grasseti, Lanistes olivaceus grasseti P.M.A. Morelet, 1863 - syn of: Lanistes grasseti P.M.A. Morelet, 1863 - (AMPULLARIIDAE)
- olivaceus marginatus, Margarites olivaceus marginatus W.H. Dall, 1919 - (MARGARITIDAE)
- olivaceus procerus, Lanistes olivaceus procerus E.C. Von Martens, 1866 - syn of: Lanistes ovum F.H. Troschel, 1845 - (AMPULLARIIDAE)
- olivae, Hermaea olivae B. McFarland, 1966 - syn of: Hermaea oliviae (F.M. MacFarland, 1966) - (HERMAEIDAE)
- olivaeforme, Prunum olivaeforme (L.C. Kiener, 1834) - (MARGINELLIDAE)
- olivaeformis, Acteocina olivaeformis (A. Issel, 1869) - (ACTEOCINIDAE)
- olivaeformis, Volvarina olivaeformis L.C. Kiener, 1834 - syn of: Prunum olivaeforme (L.C. Kiener, 1834) - (MARGINELLIDAE)
- olivaeformis, Marginella olivaeformis L.C. Kiener, 1834 - syn of: Prunum olivaeforme (L.C. Kiener, 1834) - (MARGINELLIDAE)
- olivaeformis, Imbricaria olivaeformis W.J. Swainson, 1821 - (MITRIDAE)
- olivai, Gibberula olivai J. Espinosa & J.A. Ortea, 2006 - (CYSTISCIDAE)
- Olivancillaria, Genus Olivancillaria D'Orbigny, 1840 (OLIVIDAE)
- olivaresi, Theba olivaresi G. Servain, 1880 - syn of: Theba pisana (O.F. Müller, 1774) - (HELICIDAE)
- olivaria, Pterygia olivaria J.B.P.A. Lamarck, 1811 - syn of: Pterygia nucea (J.F. Gmelin, 1791) - (MITRIDAE)
- olivaria, Nerita olivaria E.J. Le Guillou, 1841 - (NERITIDAE)
- Olivaria, syn of: Genus Oliva J.G. Bruguiθre, 1789 (OLIVIDAE)
- olivaria, Tambja olivaria N. Yonow, 1994 - (POLYCERIDAE)
- olivaria, Proterato olivaria (J.C. Melvill, 1899) - (TRIVIIDAE)
- olivaria, Radiatula olivaria (I. Lea, 1831) - (UNIONIDAE)
- olivaria, Obovaria olivaria C.S. Rafinesque, 1820 - (UNIONIDAE)
- olivarius, Unio olivarius I. Lea, 1831 - syn of: Radiatula olivaria (I. Lea, 1831) - (UNIONIDAE)
- olivarius, Omphalina lucubratus olivarius (P.H. Fischer & J.C.H. Crosse, 1872) - (ZONITIDAE)
- olivarum, Marginella olivarum S.G. Veldsman & J.H. Veldsman, 2015 - (MARGINELLIDAE)
- olivator, Gyrineum olivator O.A.L. Mörch, 1853 - syn of: Gyrineum natator (P.F. Röding, 1798) - (RANELLIDAE)
- oliveirae, Acar oliveirae J. de A. Francisco, J.C.N. Barros & S.F.B. de Lima, 2012 - (ARCIDAE)
- oliveirae, Geomalacus oliveirae H.R. Simroth, 1891 - (ARIONIDAE)
- oliveirai, Metengonoceras oliveirai I.M. Brito, 1967 † - (ENGONOCERATIDAE) (FOSSIL)
- oliveirai, Megalobulimus oliveirai (J.C. Bequaert, 1948) - (MEGALOBULIMIDAE)
- olivella, Gibberula olivella T. Cossignani, 2001 - (CYSTISCIDAE)
- olivella, Mesoginella olivella (L.A. Reeve, 1865) - (MARGINELLIDAE)
- olivella, Marginella olivella L.A. Reeve, 1865 - syn of: Mesoginella olivella (L.A. Reeve, 1865) - (MARGINELLIDAE)
- olivella, Cryptospira olivella L.A. Reeve, 1865 - syn of: Mesoginella olivella (L.A. Reeve, 1865) - (MARGINELLIDAE)
- olivella, Natica olivella É.A.A. Locard, 1897 - syn of: Amauropsis brassiculina (É.A.A. Locard, 1897) - (NATICIDAE)
- Olivella, Genus Olivella W.J. Swainson, 1831 (OLIVELLIDAE)
- olivella, Psammacoma olivella W.H. Dall, 1900 † - (TELLINIDAE) (FOSSIL)
- olivella major, Natica olivella major É.A.A. Locard, 1897 - syn of: Amauropsis brassiculina (É.A.A. Locard, 1897) - (NATICIDAE)
- olivella minor, Natica olivella minor É.A.A. Locard, 1897 - syn of: Euspira subplicata (J.G. Jeffreys, 1885) - (NATICIDAE)
- olivellaeformis, Canalispira olivellaeformis F.P. Jousseaume, 1875 - (CYSTISCIDAE)
- olivellaeformis, Imbricaria olivellaeformis H.A. Pilsbry, 1920, 1921 - syn of: Imbricaria olivaeformis W.J. Swainson, 1821 - (MITRIDAE)
- olivellai, Turbonilla olivellai D. Moreno, A. Peñas & E. Rolán, 2003 - (PYRAMIDELLIDAE)
- OLIVELLIDAE Troschel, 1869 - Family (GASTROPODA-CAENOGASTROPODA-NEOGASTROPODA)
- Olivellopsis, Subgenus Belloliva (Olivellopsis) K.H.J. Thiele, 1929 (OLIVIDAE)
- olivemeyerae, Vaughtia olivemeyerae M. Lussi, 2012 - (MURICIDAE)
- oliverai, Glyphostoma oliverai R.N. Kilburn & T.C. Lan, 2004 - (CLATHURELLIDAE)
- oliverai, Drillia oliverai R.N. Kilburn & P. Stahlschmidt, 2012 - (DRILLIIDAE)
- oliverai, Mitra oliverai G.T. Poppe, 2008 - (MITRIDAE)
- oliverai, Paziella oliverai (S. Kosuge, 1984) - (MURICIDAE)
- oliverai, Flexopteron oliverai (S. Kosuge, 1984) - syn of: Paziella oliverai (S. Kosuge, 1984) - (MURICIDAE)
- oliverai, Granuliterebra oliverai Y. Terryn & M. Holford, 2008 - (TEREBRIDAE)
- olivercoseli, Acar olivercoseli M. Huber, 2010 - (ARCIDAE)
- oliveri, Cryptoconchus oliveri E. Schwabe, 2004 - (ACANTHOCHITONIDAE)
- oliveri, Notoplax oliveri M.K. Mestayer, 1926 - syn of: Notoplax rubiginosa (F.W. Hutton, 1872) - (ACANTHOCHITONIDAE)
- oliveri, Notoplax oliveri E.A. Ashby, 1926 - syn of: Notoplax rubiginosa (F.W. Hutton, 1872) - (ACANTHOCHITONIDAE)
- oliveri, Achatinella apexfulva oliveri D.A. Welch, 1942 - (ACHATINELLIDAE)
- oliveri, Agoniatites oliveri House, 1978 † - (AGONIATITIDAE) (FOSSIL)
- oliveri, Lanistes oliveri P.D. Montfort, 1810 - (AMPULLARIIDAE)
- oliveri, Fictonoba oliveri (A.W.B. Powell, 1927) - (BARLEEIIDAE)
- oliveri, Onithochiton oliveri T. Iredale, 1914 - (CHITONIDAE)
- oliveri, Conilithes oliveri (J. Marwick, 1931 †) - (CONIDAE) (FOSSIL)
- oliveri, Limatula oliveri A.W.B. Powell, 1958 - (LIMIDAE)
- oliveri, Limopsis oliveri K. Amano & K.A. Lutaenko, 2004 - (LIMOPSIDAE)
- oliveri, Melarhaphe oliveri H.J. Finlay, 1930 - syn of: Austrolittorina antipodum (R.A. Philippi, 1847) - (LITTORINIDAE)
- oliveri, Asteracmea oliveri C.R. Laws, 1950 † - (LOTTIIDAE) (FOSSIL)
- oliveri, Lamellolucina oliveri D.W. Taylor & E.A. Glover, 2002 - (LUCINIDAE)
- oliveri, Xymene oliveri J. Marwick, 1924 - syn of: Xymenella pusilla (H.H. Suter, 1907) - (MURICIDAE)
- oliveri, Cellana oliveri A.W.B. Powell, 1955 - (NACELLIDAE)
- oliveri, Octopus oliveri (S.S. Berry, 1914) - (OCTOPODIDAE)
- oliveri, Barroisocaulus oliveri Gubanov & al., 1995 † - (PTYCHOCAULIDAE) (FOSSIL)
- oliveri, Eulimella oliveri A. Peñas & E. Rolán, 2006 - (PYRAMIDELLIDAE)
- oliveri, Onoba oliveri (A.W.B. Powell, 1955) - (RISSOIDAE)
- oliveri, Channelaxinus oliveri P.H. Valentich-Scott & E.V. Coan, 2012 - (THYASIRIDAE)
- oliveri, Stomatella oliveri (T. Iredale, 1912) - (TROCHIDAE)
- oliveri, Micrelenchus oliveri T. Iredale, 1915 - syn of: Cantharidus sanguineus (J.E. Gray, 1843) - (TROCHIDAE)
- oliveri, Cantharidus oliveri T. Iredale, 1915 - syn of: Cantharidus sanguineus (J.E. Gray, 1843) - (TROCHIDAE)
- oliveri, Mauira oliveri (J. Marwick, 1926 †) - (VOLUTIDAE) (FOSSIL)
- oliveri cryptus, Micrelenchus oliveri cryptus A.W.B. Powell, 1946 - syn of: Cantharidus sanguineus cryptus A.W.B. Powell, 1946 - (TROCHIDAE)
- oliveriana, Macrophaedusa veruta oliveriana (T.N. Annandale, 1924) - (CLAUSILIIDAE)
- oliverioi, Surrepifungium oliverioi (A. Bonfitto & B. Sabelli, 2001) - (EPITONIIDAE)
- oliverioi, Epitonium oliverioi A. Bonfitto & B. Sabelli, 2001 - syn of: Surrepifungium oliverioi (A. Bonfitto & B. Sabelli, 2001) - (EPITONIIDAE)
- oliverioi, Turbonilla oliverioi A. Peñas & E. Rolán, 1997 - (PYRAMIDELLIDAE)
- oliverioi, Onoba oliverioi C. Smriglio & P. Mariottini, 2000 - (RISSOIDAE)
- oliverioi, Alvania oliverioi G. Buzzurro, 2003 - (RISSOIDAE)
- oliveroi, Austrocucullaea oliveroi Zinsmeister, 1988 † - (CUCULLAEIDAE) (FOSSIL)
- oliveroi, Austrotrigonia oliveroi F.A. Medina, 1980 † - (TRIGONIIDAE) (FOSSIL)
- Oliveropsis, Subgenus Limopsis (Oliveropsis) M. Huber, 2010 (LIMOPSIDAE)
- olivetorum, Solatopupa olivetorum É.A.A. Locard, 1894 - syn of: Solatopupa similis (J.G. Bruguière, 1792) - (CHONDRINIDAE)
- olivetorum, Retinella olivetorum (J.F. Gmelin, 1791) - (ZONITIDAE)
- olivetorum, Retinelloides olivetorum Auct. non J.F. Gmelin, 1789 - syn of: Retinelloides incerta (J.P.R. Draparnaud, 1805) - (ZONITIDAE)
- olivetorum icterica, Retinella olivetorum icterica (N. Tiberi, 1872) - (ZONITIDAE)
- olivi, Gradiella olivi (Stoppani, 1858 †) - (COELOSTYLINIDAE) (FOSSIL)
- olivi, Dentalium olivi A. Scacchi, 1835 - syn of: Polyschides olivi (A. Scacchi, 1835) - (DENTALIIDAE)
- olivi, Polyschides olivi (A. Scacchi, 1835) - (GADILIDAE)
- olivi, Siphonodentalium olivi A. Scacchi, 1835 - syn of: Polyschides olivi (A. Scacchi, 1835) - (GADILIDAE)
- Olivia, Subgenus Cancellaria (Olivia) Cantraine, 1835 (CANCELLARIIDAE) (FOSSIL)
- Olivia, syn of: Genus Danilia . Brusina, 1865 (CHILODONTIDAE)
- oliviae, Anteaeolidiella oliviae (F.M. MacFarland, 1966) - (AEOLIDIIDAE)
- oliviae, Aeolidiella oliviae F.M. MacFarland, 1966 - syn of: Anteaeolidiella oliviae (F.M. MacFarland, 1966) - (AEOLIDIIDAE)
- oliviae, Clavatula oliviae R. Hoernes & M. Auinger † - (CLAVATULIDAE) (FOSSIL)
- oliviae, Pictetoceras oliviae King, 1998 † - (CYCLOSTOMICERATIDAE) (FOSSIL)
- oliviae, Hermaea oliviae (F.M. MacFarland, 1966) - (HERMAEIDAE)
- oliviae, Aplysiopsis oliviae F.M. MacFarland, 1966 - syn of: Hermaea oliviae (F.M. MacFarland, 1966) - (HERMAEIDAE)
- OLIVIDAE Latreille, 1825 - Family (GASTROPODA-CAENOGASTROPODA-NEOGASTROPODA)
- olivieri, Lanistes olivieri P.D. Montfort, 1810 - syn of: Lanistes carinatus (G.A. Olivier, 1801) - (AMPULLARIIDAE)
- olivieri, Albinaria olivieri (J.R. Roth, 1839) - (CLAUSILIIDAE)
- olivieri, Eutheba olivieri E.A. Rossmässler, 1837 - syn of: Eutheba parumcincta (L. Pfeiffer, 1837) - (HYGROMIIDAE)
- olivieri, Monacha olivieri A.E.J. Férussac, 1821 - syn of: Monacha cartusiana (O.F. Müller, 1774) - (HYGROMIIDAE)
- olivieri, Littorina olivieri H.J. Finlay, 1930 - (LITTORINIDAE)
- olivieri, Meekoceras olivieri Brayard & al., 2013 † - (MEEKOCERATIDAE) (FOSSIL)
- olivieri, Parmacella olivieri G.L.C.F.D. Cuvier, 1804 - (PARMACELLIDAE)
- olivieri, Pomatias olivieri J.G.F. de Charpentier - (POMATIIDAE)
- olivieri, Monodonta olivieri B.C.M. Payraudeau, 1826 - syn of: Phorcus turbinatus (I. von Born, 1778) - (TROCHIDAE)
- olivieri armathia, Albinaria olivieri armathia (O. Böttger, 1889) - (CLAUSILIIDAE)
- olivieri camura, Albinaria olivieri camura (O. Böttger, 1889) - (CLAUSILIIDAE)
- olivieri carpathia, Albinaria olivieri carpathia (O. Böttger, 1883) - (CLAUSILIIDAE)
- olivieri famosa, Albinaria olivieri famosa (O. Böttger, 1889) - (CLAUSILIIDAE)
- olivieri ibera, Parmacella olivieri ibera K.E.I. von Eichwald, 1841 - syn of: Parmacella ibera (K.E.I. von Eichwald, 1841) - (PARMACELLIDAE)
- olivieri oertzeni, Albinaria olivieri oertzeni (O. Böttger, 1889) - (CLAUSILIIDAE)
- olivieri privigna, Albinaria olivieri privigna (O. Böttger, 1883) - (CLAUSILIIDAE)
- olivieriana, Mangelia olivieriana J.C. Melvill, 1917 - (MANGELIIDAE)
- olivifer, Acrosterigma olivifer T. Iredale, 1936 - syn of: Vasticardium vertebratum (I.H. Jonas, 1844) - (CARDIIDAE)
- oliviforme, Buccinum oliviforme L.C. Kiener, 1834 † - syn of: Tritia obsoleta (T. Say, 1822 †) - (BUCCINIDAE) (FOSSIL)
- oliviforme, Cylichnium oliviforme (R.B. Watson, 1883) - (HAMINOEIDAE)
- oliviformis, Mitromorpha oliviformis (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- oliviformis, Retusa oliviformis R.B. Watson, 1883 - syn of: Cylichnium oliviforme (R.B. Watson, 1883) - (RETUSIDAE)
- oliviformis elongata, Mitromorpha oliviformis elongata É.A.A. Locard & E. Caziot, 1900 - syn of: Mitromorpha oliviformis (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- oliviformis fusca, Mitromorpha oliviformis fusca É.A.A. Locard & E. Caziot, 1900 - syn of: Mitromorpha oliviformis (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- oliviformis luteola, Mitromorpha oliviformis luteola É.A.A. Locard & E. Caziot, 1900 - syn of: Mitromorpha oliviformis (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- oliviformis major, Mitromorpha oliviformis major É.A.A. Locard & E. Caziot, 1900 - syn of: Mitromorpha oliviformis (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- oliviformis minor, Mitromorpha oliviformis minor É.A.A. Locard & E. Caziot, 1900 - syn of: Mitromorpha oliviformis (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- oliviformis rufula, Mitromorpha oliviformis rufula É.A.A. Locard & E. Caziot, 1900 - syn of: Mitromorpha oliviformis (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- oliviformis ventricosa, Mitromorpha oliviformis ventricosa É.A.A. Locard & E. Caziot, 1900 - syn of: Mitromorpha oliviformis (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- Olivina, Subgenus Olivella (Olivina) D'Orbigny, 1841 (OLIVELLIDAE) (FOSSIL)
- Olivina, syn of: Genus Olivella W.J. Swainson, 1831 (OLIVELLIDAE)
- olivoidea, Mitra olivoidea F.J. Cantraine, 1835 - syn of: Mitromorpha olivoidea (F.J. Cantraine, 1835) - (MITRIDAE)
- olivoidea, Mitromorpha olivoidea (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- olivoidea, Mitromorpha olivoidea M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1883 - syn of: Mitromorpha olivoidea (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- olivoidea crenipicta, Mitromorpha olivoidea crenipicta P. Dautzenberg, 1889 - syn of: Mitromorpha crenipicta (P. Dautzenberg, 1889) - (MITROMORPHIDAE)
- olivoidea fusca, Mitromorpha olivoidea fusca P. Dautzenberg, 1883 - (MITROMORPHIDAE)
- olivoidea granulosa, Mitromorpha olivoidea granulosa (F.J. Cantraine, 1835) - (MITROMORPHIDAE)
- olivoidea granulosa, Mitromorpha olivoidea granulosa M.E.J. Bucquoy, G.F. Dollfus & P. Dautzenberg, 1883 - syn of: Mitromorpha mediterranea C. Mifsud, 2001 - (MITROMORPHIDAE)
- olivoidea major, Mitrolumna olivoidea major M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1883 - syn of: Mitromorpha mediterranea C. Mifsud, 2001 - (MITROMORPHIDAE)
- olivoidea minor, Mitromorpha olivoidea minor M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1885 - (MITROMORPHIDAE)
- olivoidea unifasciata, Mitromorpha olivoidea unifasciata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1885 - (MITROMORPHIDAE)
- olivula, Ellobium olivula H.C. Küster, 1844 - syn of: Melampus coffea (C. Linnaeus, 1758) - (ELLOBIIDAE)
- olivula, Melampus olivula H.C. Küster, 1844 - syn of: Melampus coffea (C. Linnaeus, 1758) - (ELLOBIIDAE)
- olivula, Melanopsis olivula J.P.S. Grateloup, 1838 † - (MELANOPSIDAE) (FOSSIL)
- Olivula, Subgenus Ancilla (Olivula) Clark & Durham, 1946 (OLIVIDAE) (FOSSIL)
- olivula, Amalda olivula (J.B.P.A. Lamarck, 1802 †) - (OLIVIDAE) (FOSSIL)
- olivula, Elimia olivula (T.A. Conrad, 1834) - (PLEUROCERIDAE)
- olivula, Mitreola olivula A.A. Baudon, 1853 † - (VOLUTOMITRIDAE) (FOSSIL)
- olkhonica, Cincinna olkhonica (J. Beckmann & Y.I. Starobogatov, 1975) - (VALVATIDAE)
- olla, Acleistoceras olla (Saemann †) - (ACLEISTOCERATIDAE) (FOSSIL)
- olla, Naesiotus olla W.H. Dall, 1893 - (BULIMULIDAE)
- olla, Neverita olla M. de Serres, 1829 † - (NATICIDAE) (FOSSIL)
- olla, Natica olla P.M.T. de Serres, 1829 - syn of: Neverita josephinia (A. Risso, 1826) - (NATICIDAE)
- olla, Cymbium olla (C. Linnaeus, 1758) - (VOLUTIDAE)
- olla subglaucinoides, Neverita olla subglaucinoides A.V.M.D. D'Orbigny, 1852 - (NATICIDAE)
- Ollaphon, Genus Ollaphon T. Iredale, 1929 (FASCIOLARIIDAE)
- olleri, Moitessieria olleri C. Altimira, 1960 - (MOITESSIERIIDAE)
- ollioulensis, Ortizius ollioulensis J.R. Bourguignat, 1884 - syn of: Ortizius navarricus (J.R. Bourguignat, 1870) - (OXYCHILIDAE)
- ollonense, Glottoceras ollonense W.M. Gabb, 1877 † - (KNEMICERATIDAE) (FOSSIL)
- ollulus, Myxas ollulus A.A. Gould, 1859 - (LYMNAEIDAE)
- olmosensis, Bostryx olmosensis A.S.H. Breure, 1978 - (BULIMULIDAE)
- olmosensis, Thaumastus olmosensis A. Zilch, 1954 - (MEGASPIRIDAE)
- olomea, Nassarius olomea E.A. Kay, 1979 - (NASSARIIDAE)
- olonkini, Lyonsia olonkini T. Soot-Ryen, 1932 - syn of: Lyonsia arenosa (H.P.C. Møller, 1842) - (LYONSIIDAE)
- olopana, Haminoea olopana H.A. Pilsbry, 1921 - syn of: Liloa porcellana (A.A. Gould, 1859) - (HAMINOEIDAE)
- olorina, Mactra olorina R.A. Philippi, 1846 - (MACTRIDAE)
- olorina, Anatina olorina L.A. Reeve, 1860 - syn of: Laternula rostrata (G.B. II Sowerby, 1839) - (MACTRIDAE)
- olorinella, Americoliva reticularis olorinella (P.L. Duclos, 1835) - (OLIVIDAE)
- olorus, Spyroceras olorus (J.W. Hall, 1879 †) - (SPYROCERATIDAE) (FOSSIL)
- olrikii, Cratena olrikii (O.A.L. Mörch, 1857) - (FACELINIDAE)
- olrikki, Cuthona olrikki O.A.L. Mörch, 1857 - syn of: Cuthona viridis (E. Forbes, 1840) - (FIONIDAE)
- olseni, Sanguinolites olseni A.W. Grabau, 1931 † - (SANGUINOLITIDAE) (FOSSIL)
- olsoni, Cominella olsoni (R.K. Dell, 1956) - (BUCCINIDAE)
- olsoni, Eucominia olsoni R.K. Dell, 1956 - syn of: Cominella olsoni (R.K. Dell, 1956) - (BUCCINIDAE)
- olsoni, Palaeomphalus olsoni Rohr, 1980 † - (HELICOTOMIDAE) (FOSSIL)
- olsoni, Gegania olsoni (P.A. Maxwell, 1969 †) - (MATHILDIDAE) (FOSSIL)
- olsoni, Amalda olsoni A.G. Beu, 1970 † - (OLIVIDAE) (FOSSIL)
- olsoni, Ancilla olsoni (P.A. Maxwell, 1992 †) - (OLIVIDAE) (FOSSIL)
- Olssonella, syn of: Genus Axelella R. Petit, 1988 (CANCELLARIIDAE)
- olssoni, Anadara olssoni Clark & J.W. Durham, 1946 † - (ARCIDAE) (FOSSIL)
- olssoni, Cantharus olssoni E.J. Petuch, 1994 † - (BUCCINIDAE) (FOSSIL)
- olssoni, Metula olssoni W.P. Woodring, 1928 - (BUCCINIDAE)
- olssoni, Calliostoma olssoni C.J. Maury, 1925 † - (CALLIOSTOMATIDAE) (FOSSIL)
- olssoni, Calliostoma olssoni C.J. Maury, 1925 † - syn of: Calliostoma olssoni C.J. Maury, 1925 † - (CALLIOSTOMATIDAE) (FOSSIL)
- olssoni, Calliostoma olssoni F.M. Bayer, 1971 - syn of: Calliostoma axelolssoni J.F. Quinn, 1992 - (CALLIOSTOMATIDAE)
- olssoni, Bonellitia olssoni Rivera, 1957 † - (CANCELLARIIDAE) (FOSSIL)
- olssoni, Hedecardium olssoni J. Marwick, 1944 † - (CARDIIDAE) (FOSSIL)
- olssoni, Euglyphostoma olssoni W.P. Woodring, 1970 † - (CLATHURELLIDAE) (FOSSIL)
- olssoni, Incaglaia adusta olssoni (H.A. Pilsbry, 1949) - (CLAUSILIIDAE)
- olssoni, Strombinella olssoni W.P. Woodring & A.A. Olsson, 1957 † - (COLUMBELLIDAE) (FOSSIL)
- olssoni, Nassarina olssoni C.J. Maury, 1917 † - (COLUMBELLIDAE) (FOSSIL)
- olssoni, Lirastrombina olssoni (Perrilliat, 1972 †) - (COLUMBELLIDAE) (FOSSIL)
- olssoni, Sinaxila tumbezia olssoni (T. Oinomikado, 1939 †) - (COLUMBELLIDAE) (FOSSIL)
- olssoni, Atlanticonus olssoni (C.J. Maury, 1917 †) - (CONIDAE) (FOSSIL)
- olssoni, Vexillum olssoni J.T.L. McGinty, 1955 - syn of: Vexillum laterculatum (G.B. II Sowerby, 1874) - (COSTELLARIIDAE)
- olssoni, Pachybathron olssoni A. Wakefield, F. Boyer & T. McCleery, 2002 - (CYSTISCIDAE)
- olssoni, Epiphragmophora olssoni H.A. Pilsbry, 1926 - (EPIPHRAGMOPHORIDAE)
- olssoni, Melanella olssoni P. Bartsch, 1924 - (EULIMIDAE)
- olssoni, Mancorus olssoni Clark & J.W. Durham, 1946 † - (FASCIOLARIIDAE) (FOSSIL)
- olssoni, Pleuroploca olssoni (Anderson, 1929 †) - (FASCIOLARIIDAE) (FOSSIL)
- olssoni, Glyptostyla olssoni Clark & J.W. Durham 1946 † - (FASCIOLARIIDAE) (FOSSIL)
- olssoni, Fasciolaria olssoni Anderson, 1929 † - syn of: Pleuroploca olssoni (Anderson, 1929 †) - (FASCIOLARIIDAE) (FOSSIL)
- olssoni, Peruficus olssoni Clark & J.W. Durham, 1946 † - syn of: Glyptostyla olssoni Clark & J.W. Durham 1946 † - (FASCIOLARIIDAE) (FOSSIL)
- olssoni, Aturoidea olssoni Miller, 1947 † - (HERCOGLOSSIDAE) (FOSSIL)
- olssoni, Fimbria olssoni H.G. Richards, 1953 † - (LUCINIDAE) (FOSSIL)
- olssoni, Vokesimurex olssoni (E.H. Vokes, 1967) - (MURICIDAE)
- olssoni, Typhina olssoni A.M. Keen, 1943 † - (MURICIDAE) (FOSSIL)
- olssoni, Eupleura olssoni E.H. Vokes, 1989 † - (MURICIDAE) (FOSSIL)
- olssoni, Dermomurex olssoni E.H. Vokes, 1989 - (MURICIDAE)
- olssoni, Diplodontites olssoni H.A. Pilsbry, 1933 - (MYCETOPODIDAE)
- olssoni, Globinassa olssoni E.J. Petuch, 1994 † - (NASSARIIDAE) (FOSSIL)
- olssoni, Calacyclotus olssoni (H.A. Pilsbry, 1926) - (NEOCYCLOTIDAE)
- olssoni, Eontia olssoni (L.G. Sheldon & C.J. Maury, 1922) - (NOETIIDAE)
- olssoni, Sheldonella olssoni L.G. Sheldon & C.J. Maury, 1922 - syn of: Eontia olssoni (L.G. Sheldon & C.J. Maury, 1922) - (NOETIIDAE)
- olssoni, Olivella olssoni C.O. Van Regteren Altena, 1971 - (OLIVELLIDAE)
- olssoni, Oliva olssoni E.J. Petuch & D.M. Sargent, 1986 - (OLIVIDAE)
- olssoni, Chondropoma olssoni H.A. Pilsbry, 1933 - (POMATIIDAE)
- olssoni, Compsodrillia olssoni J.H. McLean & L.H. Poorman, 1971 - (PSEUDOMELATOMIDAE)
- olssoni, Odostomia olssoni P. Bartsch, 1924 - (PYRAMIDELLIDAE)
- olssoni, Longchaeus olssoni (C.J. Maury, 1917 †) - (PYRAMIDELLIDAE) (FOSSIL)
- olssoni, Pyramimitra olssoni K.V.W. Palmer, 1938 † - (PYRAMIMITRIDAE) (FOSSIL)
- olssoni, Ectinochilus olssoni Clark & J.W. Durham, 1946 † - (RIMELLIDAE) (FOSSIL)
- olssoni, Guestieria olssoni H.A. Pilsbry, 1932 - (SCOLODONTIDAE)
- olssoni, Occulator olssoni H.A. Pilsbry, 1926 - syn of: Calacyclotus olssoni (H.A. Pilsbry, 1926) - (SCOLODONTIDAE)
- olssoni, Spondylus olssoni Clark & J.W. Durham, 1946 † - (SPONDYLIDAE) (FOSSIL)
- olssoni, Thyasira olssoni Clark & J.W. Durham, 1946 † - (THYASIRIDAE) (FOSSIL)
- olssoni, Teinostoma olssoni B.M. Landau, F. Da Silva & S.M. Heitz, 2016 † - (TORNIDAE) (FOSSIL)
- olssoni, Hystrivasum olssoni E.H. Vokes, 1966 † - (TURBINELLIDAE) (FOSSIL)
- olssoni, Andicula olssoni Rivera, 1957 † - (TURRIDAE) (FOSSIL)
- olssoni, Turritella olssoni Clark & J.W. Durham, 1946 † - (TURRITELLIDAE) (FOSSIL)
- olssoni, Vascoceras olssoni Chudeau, 1909 † - syn of: Paravascoceras cauvini (Chudeau, 1909 †) - (VASCOCERATIDAE) (FOSSIL)
- olssoni, Petricola olssoni F.R. Bernard, 1983 - (VENERIDAE)
- olssoni, Chionopsis olssoni E. Fischer-Piette, 1969 - syn of: Chionopsis lilacina (Carpenter, 1864) - (VENERIDAE)
- olssoni, Pavora olssoni Clark & J.W. Durham, 1946 † - (VOLUTIDAE) (FOSSIL)
- olssoni, Athleta olssoni (Plummer, 1933 †) - (VOLUTIDAE) (FOSSIL)
- olssoni, Volutocorbis olssoni Plummer, 1933 † - syn of: Athleta olssoni (Plummer, 1933 †) - (VOLUTIDAE) (FOSSIL)
- olssoni gracilis, Athleta olssoni gracilis Garvie, 2013 † - (VOLUTIDAE) (FOSSIL)
- olstadi, Philobrya olstadi (T. Soot-Ryen, 1951) - (PHILOBRYIDAE)
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