- Ovella, syn of: Subgenus Passamaella (Achatinelloides) G. Nevill, 1878 (CERASTUIDAE)
- overbecki, Cleoniceras overbecki Imlay, 1960 † - (HOPLITIDAE) (FOSSIL)
- overbecki, Stutchburia overbecki Smith, 1927 † - (KALENTERIDAE) (FOSSIL)
- overbecki, Labiostrombus overbecki L.R. Cox, 1948 † - (STROMBIDAE) (FOSSIL)
- overdiepi, Manzonia overdiepi J.J. Van Aartsen, 1983 - (RISSOIDAE)
- overi, Pisidium overi V. Sterki, 1913 - syn of: Pisidium subtruncatum A.W. Malm, 1855 - (SPHAERIIDAE)
- overiapicula, Pisidium overiapicula H.B. Herrington, 1954 - syn of: Pisidium nitidum L. Jenyns, 1832 - (SPHAERIIDAE)
- overlanderensis, Pleuroxia overlanderensis G.A. Solem, 1997 - (CAMAENIDAE)
- oversa, Crassatella oversa Wood † - (CRASSATELLIDAE) (FOSSIL)
- overstonesis, Plagiostoma overstonesis Cox † - (LIMIDAE) (FOSSIL)
- overwegi, Exogyra overwegi von Buch, 1852 † - (GRYPHAEIDAE) (FOSSIL)
- ovetensis, Belgrandiella ovetensis (E. Rolán, 1992) - (HYDROBIIDAE)
- Ovicardium, Genus Ovicardium Marwick, 1944 † (CARDIIDA (UNASSIGNED)) (FOSSIL)
- ovicona, Melanopsis ovicona Deffner & Fraas, 1877 † - syn of: Melanopsis kleinii Kurr, 1856 † - (MELANOPSIDAE) (FOSSIL)
- ovidiensis, Spiralix ovidiensis H. Girardi, 2009 - (MOITESSIERIIDAE)
- ovidii, Viviparus ovidii V.V. Bogachev, 1961 † - (VIVIPARIDAE) (FOSSIL)
- ovidiiformis, Viviparus ovidiiformis (Datsenko in Gozhik & Datsenko, 2007 †) - (VIVIPARIDAE) (FOSSIL)
- oviedoiana, Pycnoptychia oviedoiana (A.V.M.D. D'Orbigny, 1842) - (UROCOPTIDAE)
- oviedoiana fabreana, Pycnoptychia oviedoiana fabreana (F. Poey in L. Pfeiffer, 1858) - (UROCOPTIDAE)
- oviforme, Ovoceras oviforme (J.W. Hall, 1860 †) - (BREVICOCERATIDAE) (FOSSIL)
- oviforme, Gomphoceras oviforme J.W. Hall, 1860 † - syn of: Ovoceras oviforme (J.W. Hall, 1860 †) - (DIESTOCERATIDAE) (FOSSIL)
- oviforme, Pleurobema oviforme T.A. Conrad, 1834 - (UNIONIDAE)
- oviforme argenteum, Pleurobema oviforme argenteum I. Lea - (UNIONIDAE)
- oviforme holstonense, Pleurobema oviforme holstonense I. Lea - (UNIONIDAE)
- oviformis, Embertoniphanta oviformis (J.P.S. Grateloup, 1839) - (ACAVIDAE)
- oviformis, Achatinella oviformis W. Newcomb - syn of: Achatinella sowerbyana L. Pfeiffer, 1855 - (ACHATINELLIDAE)
- oviformis, Acteonella oviformis W.M. Gabb, 1869 † - (ACTEONELLIDAE) (FOSSIL)
- oviformis, Acteonina oviformis (C. Moore, 1861 †) - (ACTEONINIDAE) (FOSSIL)
- oviformis, Cleionychia oviformis Kobayashi, 1934 † - (AMBONYCHIIDAE) (FOSSIL)
- oviformis, Paramytilarca oviformis Isberg, 1934 † - (AMBONYCHIIDAE) (FOSSIL)
- oviformis, Parabaicalia oviformis (W. Dybowski, 1875) - (AMNICOLIDAE)
- oviformis, Pomacea oviformis (G.P. Deshayes, 1830) - (AMPULLARIIDAE)
- oviformis, Gujocardita oviformis Nakazawa & Newell, 1968 † - (CARDITIDAE) (FOSSIL)
- oviformis, Oospira oviformis H. Nordsieck, 2011 - (CLAUSILIIDAE)
- oviformis, Abderospira oviformis (Meyer, 1886 †) - (CYLICHNIDAE) (FOSSIL)
- oviformis, Warburgia oviformis Isberg, 1934 † - (CYRTODONTIDAE) (FOSSIL)
- oviformis, Cyrtodonta oviformis Ulrich, 1894 † - (CYRTODONTIDAE) (FOSSIL)
- oviformis, Diplommatina oviformis H.C. Fulton, 1901 - (DIPLOMMATINIDAE)
- oviformis, Arinia oviformis J.J. Vermeulen, 1996 - (DIPLOMMATINIDAE)
- oviformis, Caspiohydrobia oviformis (B.M. Logvinenko & Y.I. Starobogatov, 1968) - (HYDROBIIDAE)
- oviformis, Cataceramus oviformis Walaszczyk Cobban & Harries, 2001 † - (INOCERAMIDAE) (FOSSIL)
- oviformis, Loricella oviformis (H.F. Nierstrasz, 1905) - (LORICIDAE)
- oviformis, Palaeoneilo oviformis (Eck, 1865 †) - (MALLETIIDAE) (FOSSIL)
- oviformis, Prunum oviformis (T.A. Conrad, 1868 †) - (MARGINELLIDAE) (FOSSIL)
- oviformis, Paranannites oviformis Smith, 1914 † - (MELAGATHICERATIDAE) (FOSSIL)
- oviformis, Modiolodon oviformis (Ulrich, 1894 †) - (MODIOMORPHIDAE) (FOSSIL)
- oviformis, Modiolopsis oviformis Ulrich, 1894 † - syn of: Modiolodon oviformis (Ulrich, 1894 †) - (MODIOMORPHIDAE) (FOSSIL)
- oviformis, Nerita oviformis E. Forbes, 1846 - (NERITIDAE)
- oviformis, Nuculopsis oviformis C.O. Waterhouse, 1964 † - (NUCULIDAE) (FOSSIL)
- oviformis, Ovula oviformis J.B.P.A. Lamarck, 1801 - syn of: Ovula ovum (C. Linnaeus, 1758) - (OVULIDAE)
- oviformis, Palaeomutela oviformis P. Wei † - (PALAEOMUTELIDAE) (FOSSIL)
- oviformis, Periploma oviformis L. Krishtofovich, 1984 † - syn of: Aelga altarata L. Krishtofovich, 1957 † - (PERIPLOMATIDAE) (FOSSIL)
- oviformis, Ianthinopsis oviformis Reed, 1944 † - (SOLENISCIDAE) (FOSSIL)
- oviformis, Soleniscus oviformis Delpey, 1942 † - (SOLENISCIDAE) (FOSSIL)
- oviformis milaschevitschi, Baicalia oviformis milaschevitschi W.A. Lindholm, 1909 - syn of: Parabaicalia milaschevitschi (W.A. Lindholm, 1909) - (AMNICOLIDAE)
- oviformis phenan, Embertoniphanta oviformis phenan H.A. Pilsbry - (ACAVIDAE)
- Ovilia, syn of: Genus Trigonostoma H.M.D. De Blainville, 1825 (CANCELLARIIDAE)
- Ovilia, syn of: Genus Trigonostoma H.M.D. De Blainville, 1825 (CANCELLARIIDAE)
- ovimontanum, Lytoceras ovimontanum (D. Geyer, 1893 †) - (LYTOCERATIDAE) (FOSSIL)
- ovina, Haliotis ovina J.F. Gmelin, 1791 - (HALIOTIDAE)
- ovina patamakanthini, Haliotis ovina patamakanthini H. Dekker, Regter & A. Gras, 2001 - (HALIOTIDAE)
- ovina volcanius, Haliotis ovina volcanius S. Patamakanthin & N.H. Eng, 2002 - (HALIOTIDAE)
- Ovini, Genus Ovini L.R.L. Simone, 2013 (TORNIDAE)
- ovinoides, Haliotis ovinoides (McCoy, 1876 †) - (HALIOTIDAE) (FOSSIL)
- Ovinotis, syn of: Genus Haliotis C. Linnaeus, 1758 (HALIOTIDAE)
- ovinus, Hungarites ovinus McLearn, 1948 † - syn of: Grambergia mackenzii (McLearn, 1948 †) - (CERATITIDAE) (FOSSIL)
- ovinus, Grambergia ovinus McLearn, 1948 † - syn of: Grambergia mackenzii (McLearn, 1948 †) - (LONGOBARDITIDAE) (FOSSIL)
- ovinus, Sirenites ovinus Tozer, 1994 † - (TRACHYCERATIDAE) (FOSSIL)
- oviputamen, Laevicardium serratum oviputamen (L.A. Reeve, 1844) - (CARDIIDAE)
- ovir, Turricostellaria ovir L.R.L. Simone & C.M. Cunha, 2012 - (COSTELLARIIDAE)
- ovirensis, Petasina leucozona ovirensis (E.A. Rossmässler, 1838) - (HYGROMIIDAE)
- Ovirissoa, Genus Ovirissoa C. Hedley, 1916 (RISSOIDAE)
- ovisana, Caryocorbula ovisana L.W. Stephenson, 1952 † - (CORBULIDAE) (FOSSIL)
- ovitesta, Macertexta ovitesta C.F. Laseron, 1955 - syn of: Styliferina translucida (C. Hedley, 1905) - (EULIMIDAE)
- Ovobactrites, Genus Ovobactrites Doguzhaeva , 2002 † (BACTRITIDAE) (FOSSIL)
- Ovoceras, Genus Ovoceras Flower, 1936 † (BREVICOCERATIDAE) (FOSSIL)
- Ovocerina, Genus Ovocerina Flower, 1957 † (MANDALOCERATIDAE) (FOSSIL)
- ovoidaea, Melanella ovoidaea J.R. Bourguignat, 1884 - syn of: Holandriana ovoidea (J.R. Bourguignat, 1884) - (PLEUROCERIDAE)
- ovoidea, Iselica ovoidea (A.A. Gould, 1853) - (AMATHINIDAE)
- ovoidea, Acmella ovoidea J.J. Vermeulen, T.S. Liew & M. Schilthuizen, 2015 - (ASSIMINEIDAE)
- ovoidea, Pyruella ovoidea E.J. Petuch, 1994 † - (BUSYCONIDAE) (FOSSIL)
- ovoidea, Prisconatica ovoidea W.M. Gabb, 1877 † - syn of: Euspira praegrandis F.A. Roemer, 1849 † - (CAENOGASTROPODA (unassigned)) (FOSSIL)
- ovoidea, Neoiphinoe ovoidea (R.V. Egorov & D.O. Alexeyev, 1998) - (CAPULIDAE)
- ovoidea, Semicassis ovoidea Abbass, 1967 † - (CASSIDAE) (FOSSIL)
- ovoidea, Naticopsis ovoidea de Koninck, 1881 † - (DELPHINULOPSIDAE) (FOSSIL)
- ovoidea, Atys ovoidea A. Adams in G.B. II Sowerby, 1850 - syn of: Atys naucum (C. Linnaeus, 1758) - (HAMINOEIDAE)
- ovoidea, Coralliophila ovoidea (S. Kosuge, 1985) - (MURICIDAE)
- ovoidea, Mya ovoidea P.P. Carpenter, 1864 - syn of: Mya arenaria C. Linnaeus, 1758 - (MYIDAE)
- ovoidea, Tritia ovoidea (É.A.A. Locard, 1886 †) - (NASSARIIDAE) (FOSSIL)
- ovoidea, Aciculina ovoidea M.M. Schepman, 1911 - syn of: Nassarius idyllius (J.C. Melvill & R. Standen, 1901) - (NASSARIIDAE)
- ovoidea, Nassarius ovoidea M.M. Schepman, 1911 - syn of: Nassarius idyllius (J.C. Melvill & R. Standen, 1901) - (NASSARIIDAE)
- ovoidea, Polinices ovoidea (R.A. Philippi, 1887 †) - (NATICIDAE) (FOSSIL)
- ovoidea, Ovula ovoidea A. Adams, 1872 - syn of: Margovula bimaculata (Adams, 1854) - (OVULIDAE)
- ovoidea, Palaeacmaea ovoidea J. Perner, 1903 † - syn of: Siluracmaea ovoidea (J. Perner, 1903 †) - (PALAEACMAEIDAE) (FOSSIL)
- ovoidea, Chaceia ovoidea (A.A. Gould, 1851) - (PHOLADIDAE)
- ovoidea, Physopsis ovoidea J.R. Bourguignat, 1879 - (PLANORBIDAE)
- ovoidea, Platyschisma ovoidea (B. Phillips, 1836 †) - (PLATYCERATIDAE) (FOSSIL)
- ovoidea, Gyrotoma ovoidea R.J. Shuttleworth, 1845 - (PLEUROCERIDAE)
- ovoidea, Holandriana ovoidea (J.R. Bourguignat, 1884) - (PLEUROCERIDAE)
- ovoidea, Odostomia ovoidea A. Adams, 1860 - (PYRAMIDELLIDAE)
- ovoidea, Stenothyrella ovoidea (P.S. Pavlovic, 1927 †) - (STENOTHYRIDAE) (FOSSIL)
- ovoidea, Edentulina ovoidea (J.G. Bruguière, 1792) - (STREPTAXIDAE)
- ovoidea, Turbinella laevigata ovoidea L.C. Kiener, 1840 - (TURBINELLIDAE)
- ovoidea, Siluracmaea ovoidea (J. Perner, 1903 †) - (YOCHELSONIIDAE) (FOSSIL)
- ovoidea brevis, Nassarius ovoidea brevis M.M. Schepman, 1911 † - syn of: Tritia sinusigera (A. Adams, 1852) - (NASSARIIDAE) (FOSSIL)
- ovoidea brevis, Alectrion ovoidea brevis M.M. Schepman, 1911 † - syn of: Tritia sinusigera (A. Adams, 1852) - (NASSARIIDAE) (FOSSIL)
- ovoideaminor, Mastus ovoideaminor T.A. de M. Monterosato, 1892 - syn of: Jaminia pupa (C. Linnaeus, 1758) - (ENIDAE)
- ovoides, Acteon ovoides T.A. Conrad, 1830 † - (ACTEONIDAE) (FOSSIL)
- ovoides, Gibberula ovoides Boyer, 2017 - (CYSTISCIDAE)
- ovoides, Fluviocingula ovoides Y.I. Starobogatov, 1989 - (IRAVADIIDAE)
- ovoides, Turbonitella ovoides J. Perner, 1903 † - (NERITOPSIDAE) (FOSSIL)
- ovoides, Trochonemopsis ovoides A.W. Grabau & Sherzer, 1910 † - syn of: Trochonemopsis meekanum Miller, 1889 † - (OMPHALOTROCHIDAE) (FOSSIL)
- ovoides, Retusa ovoides (K.O. Milaschewitsch, 1916) - (RETUSIDAE)
- ovoides, Trochonema ovoides Miller, 1889 † - syn of: Trochonemopsis meekanum Miller, 1889 † - (TROCHONEMATIDAE) (FOSSIL)
- ovoideum, Canistrum ovoideum (G.B. I Sowerby, 1833) - (BRADYBAENIDAE)
- ovoideum, Pilina ovoideum E.F.R.K. Koken & J. Perner, 1925 † - (TRYBLIDIIDAE) (FOSSIL)
- ovoideum euryzonum, Canistrum ovoideum euryzonum (L. Pfeiffer, 1847) - (BRADYBAENIDAE)
- ovoideum luzonicum, Canistrum ovoideum luzonicum (G.B. I Sowerby, 1833) - (BRADYBAENIDAE)
- ovoideus, Iphinoe ovoideus R.V. Egorov & D.O. Alexeyev, 1998 - syn of: Neoiphinoe ovoidea (R.V. Egorov & D.O. Alexeyev, 1998) - (CAPULIDAE)
- ovoideus, Stilifer ovoideus H. Adams & A. Adams, 1853 - (EULIMIDAE)
- ovoideus, Cryptodon ovoideus W.H. Dall, 1890 - syn of: Ascetoaxinus ovoideus (W.H. Dall, 1890) - (MACTRIDAE)
- ovoideus, Diminovula ovoideus A. Adams, 1873 - syn of: Diminovula alabaster (L.A. Reeve, 1865) - (OVULIDAE)
- ovoideus, Charonia ovoideus R. Tate, 1888 † - (RANELLIDAE) (FOSSIL)
- ovoideus, Ascetoaxinus ovoideus (W.H. Dall, 1890) - (THYASIRIDAE)
- ovosimilis, Melanopsis ovosimilis Willmann, 1981 † - (MELANOPSIDAE) (FOSSIL)
- Ovotropis, syn of: Subgenus Trichotropis (Iphinoe) H. Adams & A. Adams, 1854 (CAPULIDAE)
- ovraensis, Cyclocardia ovraensis V.N. Sinelnikova, 1991 † - (CARDITIDAE) (FOSSIL)
- ovriensis, Gari ovriensis V.N. Sinelnikova, 1991 † - (PSAMMOBIIDAE) (FOSSIL)
- ovriensis, Conominolia ovriensis A. Oleinik, 1991 † - (TROCHIDAE) (FOSSIL)
- ovula, Bulla ovula A.A. Gould in G.B. II Sowerby, 1868 - syn of: Bulla vernicosa A.A. Gould, 1859 - (BULLIDAE)
- ovula, Bulla ovula G.B. II Sowerby, 1868 - syn of: Bulla vernicosa A.A. Gould, 1859 - (BULLIDAE)
- ovula, Coelostylina ovula E.A.L. Kittl, 1894 † - (COELOSTYLINIDAE) (FOSSIL)
- ovula, Persicula ovula T.A. Conrad, 1848 † - (CYSTISCIDAE) (FOSSIL)
- ovula, Tralia ovula (J.G. Bruguière, 1789) - (ELLOBIIDAE)
- ovula, Melanopsis ovula (J.R. Bourguignat, 1884) - (MELANOPSIDAE)
- ovula, Nucula ovula Lea, 1833 † - (NUCULIDAE) (FOSSIL)
- Ovula, Genus Ovula J.G. Bruguière, 1789 (OVULIDAE)
- Ovulactaeon, Genus Ovulactaeon W.H. Dall, 1889 (ACTEONIDAE)
- ovulaea, Venus ovulaea J.B.P.A. Lamarck, 1818 - syn of: Tapes conspersus (J.F. Gmelin, 1791) - (VENERIDAE)
- Ovulamarginella, syn of: Genus Marginella J.B.P.A. Lamarck, 1799 (MARGINELLIDAE)
- Ovularia, syn of: Genus Ovula J.G. Bruguière, 1789 (OVULIDAE)
- ovularis, Cochlostyla metaformis ovularis (K.T. Menke, 1828) - (BRADYBAENIDAE)
- ovularis, Granaria ovularis A. Moquin-Tandon, 1856 - syn of: Granaria variabilis (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- ovularis, Cymbulia ovularis L.F.A. Souleyet, 1852 - syn of: Corolla ovata (J.R.C. Quoy & J.P. Gaimard, 1833) - (CYMBULIIDAE)
- ovularis, Multidentula ovularis (G.A. Olivier, 1791) - (ENIDAE)
- ovularis, Fauxulus ovularis (H.C. Küster, 1841) - (FAUXULIDAE)
- ovularis, Monacha ovularis (J.R. Bourguignat, 1855) - (HYGROMIIDAE)
- ovularis, Melanopsis ovularis A. Watelet, 1853 † - (MELANOPSIDAE) (FOSSIL)
- ovulata, Bulla ovulata G.B. Brocchi, 1814 - syn of: Atys jeffreysi (H.C. Weinkauff, 1866) - (BULLIDAE)
- ovulata, Conella ovulata (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- ovulata, Pyrene ovulata J.B.P.A. Lamarck, 1822 - syn of: Conella ovulata (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- ovulata, Caryocorbula ovulata Sowerby, 1835 - (CORBULIDAE)
- ovulata, Atys ovulata J.G. Jeffreys, 1860 - syn of: Atys jeffreysi (H.C. Weinkauff, 1866) - (HAMINOEIDAE)
- ovulata, Cryptospira ovulata (J.B.P.A. Lamarck, 1803 †) - (MARGINELLIDAE) (FOSSIL)
- ovulata, Globisetia ovulata F. Nordsieck, 1972 - syn of: Setia turriculata T.A. de M. Monterosato, 1884 - (RISSOIDAE)
- ovulata, Roxania ovulata (J.B.P.A. Lamarck, 1804 †) - (SCAPHANDRIDAE) (FOSSIL)
- ovulata, Triviella ovulata (J.B.P.A. Lamarck, 1810) - (TRIVIIDAE)
- ovulata, Trivia ovulata J.B.P.A. Lamarck, 1811 - syn of: Triviella ovulata (J.B.P.A. Lamarck, 1810) - (TRIVIIDAE)
- ovulata rubra, Triviella ovulata rubra H.O.N. Shaw, 1909 - syn of: Triviella rubra (H.O.N. Shaw, 1909) - (TRIVIIDAE)
- ovulatella, Willungia ovulatella (R. Tate, 1890 †) - (EOCYPRAEIDAE) (FOSSIL)
- Ovulatibuccinum, Genus Ovulatibuccinum A.N. Golikov & B.I. Sirenko, 1989 (BUCCINIDAE)
- ovulatum, Chrysostoma ovulatum Hebert & Deslongchamps, 1909 † - syn of: Ataphrus acmon (A.V.M.D. D'Orbigny, 1853 †) - (TROCHIDAE) (FOSSIL)
- ovulatus, Ataphrus ovulatus (Hebert & Deslongchamps, 1860 †) - (ATAPHRIDAE) (FOSSIL)
- OVULIDAE Fleming, 1822 - Family (GASTROPODA-CAENOGASTROPODA [Subclass]-LITTORINIMORPHA [Order]-CYPRAEOIDEA [Superfamily])
- ovuliformis, Gibberulina ovuliformis d'Orbigny, 1842 - syn of: Granulina ovuliformis (A.V.M.D. D'Orbigny, 1842) - (CYSTISCIDAE)
- ovuliformis, Cylichnidia ovuliformis (R.T. Lowe, 1831) - (FERUSSACIIDAE)
- ovuliformis, Granulina ovuliformis (A.V.M.D. D'Orbigny, 1842) - (MARGINELLIDAE)
- ovuliformis, Pedicularia californica ovuliformis S.S. Berry, 1946 - (PEDICULARIIDAE)
- ovuliformis, Potomida ovuliformis É.A.A. Locard, 1893 - syn of: Potomida littoralis (G.L.C.F.D. Cuvier, 1798) - (UNIONIDAE)
- ovulina, Acteon ovulina A.V.M.D. D'Orbigny, 1852 † - (ACTEONIDAE) (FOSSIL)
- ovulina, Bulla ovulina A. Adams, 1850 - syn of: Volvulella ovulina (A. Adams, 1850) - (BULLIDAE)
- ovulina, Granaria ovulina É.A.A. Locard, 1894 - syn of: Granaria variabilis (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- ovulina, Sphaerocypraea ovulina (J.P.S. Grateloup, 1833 †) - (EOCYPRAEIDAE) (FOSSIL)
- ovulina, Scintilla ovulina G.P. Deshayes, 1856 - (GALEOMMATIDAE)
- ovulina, Cyllene vulgatissima ovulina M.A. Peyrot, 1924 † - (NASSARIIDAE) (FOSSIL)
- ovulina, Retusa ovulina G.Y. Lin, 1991 - (RETUSIDAE)
- ovulina, Volvulella ovulina (A. Adams, 1850) - (RHIZORIDAE)
- ovulinus, Rhizorus ovulinus A. Adams, 1850 - syn of: Volvulella ovulina (A. Adams, 1850) - (RHIZORIDAE)
- ovuloides, Apiocardia ovuloides L.A. Reeve, 1845 - syn of: Apiocardia obovale (Sowerby, 1833) - (CARDIIDAE)
- ovuloides, Conella ovuloides (C.B. Adams, 1850) - (COLUMBELLIDAE)
- ovuloides, Meta ovuloides L.A. Reeve, 1859 - syn of: Conella ovulata (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- ovuloides, Parametaria ovuloides L.A. Reeve, 1859 - syn of: Conella ovulata (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- ovuloides, Melampus ovuloides J.R.C. Quoy & J.P. Gaimard, 1832 - (ELLOBIIDAE)
- Ovulopsis, Genus Ovulopsis Moericke, 1895 † (CEPHALASPIDA (UNASSIGNED)) (FOSSIL)
- ovulum, Tornatella ovulum L. Pfeiffer, 1840 - syn of: Microtralia ovulum (L. Pfeiffer, 1840) - (ACTEONIDAE)
- ovulum, Actaeon ovulum L. Pfeiffer, 1840 - syn of: Microtralia ovulum (L. Pfeiffer, 1840) - (ACTEONIDAE)
- ovulum, Ovulatibuccinum ovulum (W.H. Dall, 1895) - (BUCCINIDAE)
- ovulum, Bulla ovulum A.A. Gould in G.F. Angas, 1867 - syn of: Bulla vernicosa A.A. Gould, 1859 - (BULLIDAE)
- ovulum, Semicassis ovulum A.E. Ortmann, 1900 † - (CASSIDAE) (FOSSIL)
- ovulum, Naticopsis ovulum L. Waagen, 1880 † - (DELPHINULOPSIDAE) (FOSSIL)
- ovulum, Dentalium ovulum R.A. Philippi, 1844 - syn of: Cadulus ovulum (R.A. Philippi, 1844) - (DENTALIIDAE)
- ovulum, Sinoennea ovulum (A.R.J.B. Bavay & P. Dautzenberg, 1912) - (DIAPHERIDAE)
- ovulum, Cirsope ovulum (R.A. Philippi, 1843 †) - (ELACHISINIDAE) (FOSSIL)
- ovulum, Microtralia ovulum (L. Pfeiffer, 1840) - (ELLOBIIDAE)
- ovulum, Cadulus ovulum (R.A. Philippi, 1844) - (GADILIDAE)
- ovulum, Cryptophysema ovulum (L.A. Reeve, 1850) - (LUCINIDAE)
- ovulum, Lucina ovulum L.A. Reeve, 1850 - syn of: Cryptophysema ovulum (L.A. Reeve, 1850) - (LUCINIDAE)
- ovulum, Ovaginella ovulum (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- ovulum, Marginella ovulum G.B. II Sowerby, 1846 - syn of: Ovaginella ovulum (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- ovulum, Hologyra ovulum (Stoppani, 1858 †) - (NATICOPSIDAE) (FOSSIL)
- ovulum, Amphioctopus ovulum (M. Sasaki, 1917) - (OCTOPODIDAE)
- Ovulum, syn of: Genus Ovula J.G. Bruguière, 1789 (OVULIDAE)
- ovulum, Crisilla ovulum S. Gofas, 2007 - (RISSOIDAE)
- ovulum, Koreanomelania nodifila ovulum (E.C. Von Martens, 1894) - (SEMISULCOSPIRIDAE)
- ovulum, Rhinus ovulum (L.A. Reeve, 1849) - (SIMPULOPSIDAE)
- ovulum, Helcionopsis ovulum J. Perner, 1903 † - syn of: Sluzka ovulum (J. Perner, 1903 †) - (TRYBLIDIIDAE) (FOSSIL)
- ovulum, Viviparus ovulum M. von Neumayr in M. von Neumayr & C.R.C. Paul, 1875 † - (VIVIPARIDAE) (FOSSIL)
- ovulum, Sluzka ovulum (J. Perner, 1903 †) - (VLASTIDAE) (FOSSIL)
- ovulum, Yoldiella ovulum R. La Perna, 2004 - (YOLDIIDAE)
- Ovulus, syn of: Genus Ovula J.G. Bruguière, 1789 (OVULIDAE)
- ovum, Achatinella turgida ovum L. Pfeiffer, 1857 - (ACHATINELLIDAE)
- ovum, Archachatina marginata ovum (L. Pfeiffer, 1858) - (ACHATINIDAE)
- ovum, Lanistes ovum F.H. Troschel, 1845 - (AMPULLARIIDAE)
- ovum, Bothriembryon ovum (G.P. Deshayes, 1836) - (BOTHRIEMBRYONTIDAE)
- ovum, Liomesus ovum (W. Turton, 1825) - (BUCCINIDAE)
- ovum, Cardinia ovum Martin, 1859 † - (CARDINIIDAE) (FOSSIL)
- ovum, Ryssota otaheitana ovum (A. Valenciennes, 1827) - (CHRONIDAE)
- ovum, Erronea ovum (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- ovum, Erronea ovum L.C. Kiener, 1843 - syn of: Erronea errones (C. Linnaeus, 1758) - (CYPRAEIDAE)
- ovum, Gomphoceras ovum Barrande, 1865 † - syn of: Ovocerina ovum (Barrande, 1865 †) - (DIESTOCERATIDAE) (FOSSIL)
- ovum, Micratys ovum T. Habe, 1952 - (HAMINOEIDAE)
- ovum, Turricaspia ovum B.M. Logvinenko & Y.I. Starobogatov, 1968 - (HYDROBIIDAE)
- ovum, Euanodontia ovum (L.A. Reeve, 1850) - (LUCINIDAE)
- ovum, Lucina ovum L.A. Reeve, 1850 - syn of: Euanodontia ovum (L.A. Reeve, 1850) - (LUCINIDAE)
- ovum, Lymnaea ovum A. Brongniart, 1810 † - (LYMNAEIDAE) (FOSSIL)
- ovum, Ovocerina ovum (Barrande, 1865 †) - (MANDALOCERATIDAE) (FOSSIL)
- ovum, Ovaginella ovum G.B. II Sowerby, 1846 - syn of: Ovaginella ovulum (G.B. II Sowerby, 1846) - (MARGINELLIDAE)
- ovum, Bullata ovum J.F. Gmelin, 1791 - syn of: Bullata bullata (I. von Born, 1778) - (MARGINELLIDAE)
- ovum, Marginella ovum L.A. Reeve, 1865 - syn of: Bullata largillieri (L.C. Kiener, 1841) - (MARGINELLIDAE)
- ovum, Bullata ovum L.A. Reeve, 1865 - syn of: Bullata largillieri (L.C. Kiener, 1841) - (MARGINELLIDAE)
- ovum, Paranannites ovum Brayard & Bucher, 2008 † - syn of: Paranannites involutus Chao, 1959 † - (MELAGATHICERATIDAE) (FOSSIL)
- ovum, Melanopsis ovum J.R. Bourguignat, 1884 - syn of: Melanopsis jordanica J.R. Roth, 1839 - (MELANOPSIDAE)
- ovum, Nassarius ovum Martin, 1879 † - (NASSARIIDAE) (FOSSIL)
- ovum, Natica ovum K.T. Menke, 1850 - syn of: Polinices uber (A. Valenciennes, 1832) - (NATICIDAE)
- ovum, Natica ovum K.T. Menke, 1850 - syn of: Polinices uber (A. Valenciennes, 1832) - (NATICIDAE)
- ovum, Praesaccella ovum (Sowerby, 1825 †) - (NUCULANIDAE) (FOSSIL)
- ovum, Praesacella ovum (J. de C. Sowerby 1825) † - (NUCULIDA (UNASSIGNED)) (FOSSIL)
- ovum, Ovula ovum (C. Linnaeus, 1758) - (OVULIDAE)
- ovum, Aspidopholas ovum (W. Wood, 1828) - (PHOLADIDAE)
- ovum, Pholas ovum W. Wood, 1828 - syn of: Aspidopholas ovum (W. Wood, 1828) - (PHOLADIDAE)
- ovum, Pisidium ovum V. Sterki, 1916 - syn of: Pisidium ventricosum T. Prime, 1851 - (SPHAERIIDAE)
- ovum, Periglypta ovum S.C.T. Hanley, 1845 - syn of: Meretrix casta (J.F. Gmelin, 1791) - (VENERIDAE)
- ovum, Rivularia ovum P.M. Heude, 1890 - (VIVIPARIDAE)
- ovum bangweolicus, Lanistes ovum bangweolicus F. Haas, 1936 - (AMPULLARIIDAE)
- ovum chrysostoma, Erronea ovum chrysostoma F.A. Schilder, 1927 - (CYPRAEIDAE)
- ovum elatior, Lanistes ovum elatior E.C. Von Martens, 1866 - syn of: Lanistes ovum F.H. Troschel, 1845 - (AMPULLARIIDAE)
- ovum erici, Erronea ovum erici F.Jr. Lorenz, C.B. Bridges & M. Chiapponi, 2011 - (CYPRAEIDAE)
- ovum lacoini, Lanistes ovum lacoini J. Germain, 1907 - syn of: Lanistes ovum F.H. Troschel, 1845 - (AMPULLARIIDAE)
- ovum major, Lanistes ovum major J. Germain, 1907 - syn of: Lanistes ovum F.H. Troschel, 1845 - (AMPULLARIIDAE)
- ovum mweruensis, Meladomus ovum mweruensis T. Pain, 1954 - syn of: Lanistes ovum F.H. Troschel, 1845 - (AMPULLARIIDAE)
- ovum palauensis, Erronea ovum palauensis F.A. Schilder & M. Schilder, 1938 - (CYPRAEIDAE)
- ovum plicosus, Lanistes ovum plicosus E.C. Von Martens, 1897 - syn of: Lanistes ovum F.H. Troschel, 1845 - (AMPULLARIIDAE)
- ovum purpureus, Lanistes ovum purpureus I.H. Jonas, 1839 - syn of: Lanistes purpureus (I.H. Jonas, 1839) - (AMPULLARIIDAE)
- ovumformis, Pyrgulina ovumformis (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- ovumlacerti, Cylichnella ovumlacerti R.J.L. Guppy, 1874 † - (CYLICHNIDAE) (FOSSIL)
- ovummuscae, Botryphallus ovummuscae (S. Gofas, 1990) - (RISSOIDAE)
- ovumralli, Oliva ovumralli J. Ford, 1899 - syn of: Oliva bulbosa (P.F. Röding, 1798) - (OLIVIDAE)
- ovumreguli, Coryda ovumreguli (H.C. Lea) - (CEPOLIDAE)
- ovumreguli ramsdeni, Coryda ovumreguli ramsdeni C.G. Aguayo & M.L. Jaume - (CEPOLIDAE)
- ovumvanelli, Bulla ovumvanelli P.F. Röding, 1798 - syn of: Bulla ampulla C. Linnaeus, 1758 - (BULLIDAE)
- owaihiensis, Tornatellina owaihiensis L.K.A. von Chamisso, 1829 - syn of: Auriculella auricula (A.E.J. Férussac, 1821) - (ACHATINELLIDAE)
- owaihiensis, Ellobium owaihiensis L.K.A. von Chamisso, 1829 - syn of: Auriculella auricula (A.E.J. Férussac, 1821) - (ELLOBIIDAE)
- Owaraha, Subgenus Orpiella (Owaraha) F.C. Baker, 1941 (HELICARIONIDAE)
- owenanus, Eccyliopterus owenanus (F.B. Meek & A.H. Worthen, 1868 †) - (LESUEURILLIDAE) (FOSSIL)
- owenanus, Ecculiomphalus owenanus F.B. Meek & A.H. Worthen, 1868 † - syn of: Eccyliopterus owenanus (F.B. Meek & A.H. Worthen, 1868 †) - (OPHILETIDAE) (FOSSIL)
- Owenella, Genus Owenella Ulrich & Scofield, 1897 † (COREOSPIRIDAE) (FOSSIL)
- owenense, Eoderoceras owenense C.T. Simpson, 1843 † - (EODEROCERATIDAE) (FOSSIL)
- owenensis, Nucinella owenensis P.G. Oliver & D.W. Taylor, 2012 - (NUCINELLIDAE)
- owenga, Turbonilla owenga (C.R. Laws, 1937) - (PYRAMIDELLIDAE)
- owengaensis, Munditia owengaensis A.W.B. Powell, 1933 - (LIOTIIDAE)
- owengriffithsi, Ampelita owengriffithsi K.C. Emberton, 2010 - (ACAVIDAE)
- owengriffithsi, Obeliscus owengriffithsi Thach & F. Huber, 2017 - (SUBULINIDAE)
- Owengriffithsius, Genus Owengriffithsius Emberton, 2002 (CYCLOPHORIDAE)
- oweni, Pachycrommium oweni (d'Archiac & Haime, 1854 †) - (AMPULLINIDAE) (FOSSIL)
- oweni, Belosepia oweni J. de C. Sowerby & G. Dixon, 1850 † - (BELOSAEPIIDAE) (FOSSIL)
- oweni, Pojetaconcha oweni (Kindle, 1903 †) - (BRANSONIIDAE) (FOSSIL)
- oweni, Cerion oweni W.H. Dall, 1905 - (CERIONIDAE)
- oweni, Donax oweni S.C.T. Hanley, 1844 - syn of: Donax owenii S.C.T. Hanley, 1843 - (DONACIDAE)
- oweni, Cerithioides oweni J. Donald, 1895 † - (GONIASMATIDAE) (FOSSIL)
- oweni, Haliotis corrugata oweni R.R. Talmadge, 1966 - (HALIOTIDAE)
- oweni, Inyoites oweni A. Hyatt & Smith, 1905 † - (INYOITIDAE) (FOSSIL)
- oweni, Paupospira oweni (Ulrich & Scofield, 1897 †) - (LOPHOSPIRIDAE) (FOSSIL)
- oweni, Palaeoneilo oweni (McChesney, 1859 †) - (MALLETIIDAE) (FOSSIL)
- oweni, Modiolopsis oweni Ulrich, 1894 † - (MODIOMORPHIDAE) (FOSSIL)
- oweni, Muensteroceras oweni (J.W. Hall, 1859 †) - (MUENSTEROCERATIDAE) (FOSSIL)
- oweni, Orthoceras oweni Ulrich, 1894 † - (ORTHOCERATIDAE) (FOSSIL)
- oweni, Bractechlamys oweni (A. De Gregorio, 1884) - (PECTINIDAE)
- oweni, Teredina oweni G.P. Deshayes, 1856 † - (TEREDINIDAE) (FOSSIL)
- oweni, Trachydomia oweni Knight, 1933 † - (TRACHYSPIRIDAE) (FOSSIL)
- oweni, Triphora oweni F. Baker, 1926 - (TRIPHORIDAE)
- oweni, Coelocentrum oweni G.D. Hanna, 1923 - syn of: Spartocentrum insulare G.D. Hanna, 1923 - (UROCOPTIDAE)
- oweni, Yoldia oweni McChesney, 1859 † - syn of: Palaeoneilo oweni (McChesney, 1859 †) - (YOLDIIDAE) (FOSSIL)
- oweni incisum, Cerion oweni incisum W.H. Dall, 1905 - (CERIONIDAE)
- Owenia, syn of: Genus Teuthowenia C. Chun, 1910 (CRANCHIIDAE)
- oweniana, Ryssota oweniana L. Pfeiffer, 1853 - (CHRONIDAE)
- oweniana, Conus oweniana Anderson, 1905 † - (CONIDAE) (FOSSIL)
- oweniana, Succincta oweniana (L. Pfeiffer, 1849) - (HELICINIDAE)
- oweniana, Neritina oweniana (W. Wood, 1828) - (NERITIDAE)
- oweniana, Sepietta oweniana (A.V.M.D. D'Orbigny, 1841) - (SEPIOLIDAE)
- oweniana anozona, Succincta oweniana anozona (E.C. Von Martens, 1900) - (HELICINIDAE)
- oweniana coccinostoma, Succincta oweniana coccinostoma (P.M.A. Morelet, 1849) - (HELICINIDAE)
- oweniana smithi, Ryssota oweniana smithi P. Bartsch, 1933 - (CHRONIDAE)
- owenii, Argonauta hians owenii A. Adams & L.A. Reeve, 1848 - (ARGONAUTIDAE)
- owenii, Arion owenii S.M. Davies, 1979 - (ARIONIDAE)
- owenii, Bistolida owenii (J.E. Gray in G.B. II Sowerby, 1832) - (CYPRAEIDAE)
- owenii, Donax owenii S.C.T. Hanley, 1843 - (DONACIDAE)
- owenii, Enoploteuthis owenii J.E. Gray, 1849 - syn of: Asteroteuthis veranyi (W.P.E.S. Rüppell, 1844) - (ENOPLOTEUTHIDAE)
- owenii, Scintilla owenii G.P. Deshayes, 1856 - (GALEOMMATIDAE)
- owenii, Cyllene owenii J.E. Gray in E. Griffith & E. Pidgeon, 1834 - (NASSARIIDAE)
- owenii, Neritina owenii J. Mawe, 1823 - (NERITIDAE)
- owenii, Rossia owenii A.D. Ball, 1841 - syn of: Rossia macrosoma (S. Delle Chiaje, 1830) - (SEPIOLIDAE)
- owenii, Tellina owenii S.C.T. Hanley, 1845 - (TELLINIDAE)
- owenii piae, Bistolida owenii piae F.Jr. Lorenz & M. Chiapponi, 2005 - syn of: Bistolida piae F.Jr. Lorenz & M. Chiapponi, 2005 - (CYPRAEIDAE)
- owenii vasta, Bistolida owenii vasta F.A. Schilder & M. Schilder, 1938 - syn of: Bistolida vasta F.A. Schilder & M. Schilder, 1938 - (CYPRAEIDAE)
- Owenites, Genus Owenites Hyatt & Smith, 1905 † (MELAGATHICERATIDAE) (FOSSIL)
- Owenoceras, Genus Owenoceras Miller & Furnish, 1940 † (GASTRIOCERATIDAE) (FOSSIL)
- owensensis, Pyrgulopsis owensensis R. Hershler, 1989 - (HYDROBIIDAE)
- Owensgriffithsius, Genus Owensgriffithsius K.C. Emberton, 2001 (CYCLOPHORIDAE)
- owensi, Vermicularia fargoi owensi E.J. Petuch & R.F. Myers, 2014 - (TURRITELLIDAE)
- oweri, Argonauta oweri C.A. Fleming, 1945 † - (ARGONAUTIDAE) (FOSSIL)
- owyheensis, Pyrgulopsis owyheensis R. Hershler & H.P. Liu, 2009 - (HYDROBIIDAE)
- oxfordense, Dyscritoceras oxfordense Ulrich & al., 1944 † - (BASSLEROCERATIDAE) (FOSSIL)
- Oxfordoceras, Genus Oxfordoceras Ulrich & al., 1944 † (ORTHOCERATIDAE) (FOSSIL)
- oxia, Nannodiella oxia (K.J. Bush, 1885) - (CLATHURELLIDAE)
- oxia, Fissurisepta oxia (R.B. Watson, 1883) - (FISSURELLIDAE)
- oxia, Nassarius oxia Gardner, 1944 † - (NASSARIIDAE) (FOSSIL)
- oxia, Nuculana oxia W.H. Dall, 1916 - syn of: Saccella penderi (W.H. Dall & P. Bartsch, 1910) - (NUCULANIDAE)
- oxia, Odostomia oxia R.B. Watson, 1886 - (PYRAMIDELLIDAE)
- oxiana, Digoniostoma oxiana Z.I. Izzatullaev, 1982 - (BITHYNIIDAE)
- oxianus, Buliminus oxianus E.C. Von Martens, 1876 - syn of: Pseudonapaeus sogdianus (E.C. Von Martens, 1874) - (ENIDAE)
- oxianus brevior, Buliminus oxianus brevior E.C. Von Martens, 1876 - syn of: Pseudonapaeus sogdianus (E.C. Von Martens, 1874) - (ENIDAE)
- oxillia, Anachis oxillia (P.L. Duclos, 1846) - (COLUMBELLIDAE)
- oximeris, Terebra oximeris Unknown - syn of: Oxymeris maculata (C. Linnaeus, 1758) - (TEREBRIDAE)
- Oxinoe, syn of: Genus Oxynoe C.S. Rafinesque, 1814 (OXYNOIDAE)
- Oxintoceras, Genus Oxintoceras Kusina, 1974 † (INTOCERATIDAE) (FOSSIL)
- Oxisma, syn of: Genus Pinna C. Linnaeus, 1758 (PINNIDAE)
- oxonica, Parkinsonia oxonica Arkell, 1956 † - (PARKINSONIIDAE) (FOSSIL)
- oxoniensis, Pachnodus oxoniensis J. Gerlach, 1994 - (CERASTUIDAE)
- oxoniensis, Corbula oxoniensis Arkell, 1935 † - (CORBULIDAE) (FOSSIL)
- oxoniensis, Perna oxoniensis (right valve) Paris † - (MYTILIDAE) (FOSSIL)
- oxossi, Favartia oxossi (E.J. Petuch, 1979) - (MURICIDAE)
- oxossi, Pygmaepterys oxossi (E.J. Petuch, 1979) - syn of: Favartia oxossi (E.J. Petuch, 1979) - (MURICIDAE)
- oxum, Dermomurex oxum E.J. Petuch, 1979 - (MURICIDAE)
- oxus, Oxycerites oxus (Buckman, 1926 †) - (OPPELIIDAE) (FOSSIL)
- oxy, Sphaeromanticoceras oxy (A.H. Clarke, 1897 †) - (GEPHUROCERATIDAE) (FOSSIL)
- oxyacantha, Torleyoceras oxyacantha (C.L.F. von Sandberger, 1851 †) - (CHEILOCERATIDAE) (FOSSIL)
- oxyacantha, Favorinus oxyacantha L.S.R. Bergh, 1871 - syn of: Favorinus branchialis (J. Rathke, 1806) - (FACELINIDAE)
- oxyacantha, Melanopsis oxyacantha Š. Brusina, 1902 † - (MELANOPSIDAE) (FOSSIL)
- oxyacantha, Homalocantha oxyacantha (W.J. Broderip, 1833) - (MURICIDAE)
- oxyacme, Kalidos oxyacme (C.M.F. Ancey, 1902) - (ARIOPHANTIDAE)
- oxyacme, Melanella oxyacme (H.H. Suter, 1908) - (EULIMIDAE)
- oxyacris, Gazameda oxyacris R. Tate, 1897 - syn of: Gazameda tasmanica (L.A. Reeve, 1849) - (TURRITELLIDAE)
- oxyacris, Turritella oxyacris R. Tate, 1897 - syn of: Gazameda tasmanica (L.A. Reeve, 1849) - (TURRITELLIDAE)
- Oxyacrum, Genus Oxyacrum A.E.M. Cossmann, 1889 (TURRIDAE)
- Oxyarietites, Genus Oxyarietites Dommergues & Goolaerts, 2012 † (AMMONITIDA (UNASSIGNED)) (FOSSIL)
- oxybasis, Solariella oxybasis W.H. Dall, 1890 - (SOLARIELLIDAE)
- oxybeles, Fontigens oxybeles H.A. Pilsbry, 1950 - (AMNICOLIDAE)
- Oxybeloceras, Genus Oxybeloceras Hyatt , 1900 † (DIPLOMOCERATIDAE) (FOSSIL)
- oxycantha, Homalocantha oxycantha W.J. Broderip, 1833 - syn of: Homalocantha oxyacantha (W.J. Broderip, 1833) - (MURICIDAE)
- oxycephalus, Arcestes oxycephalus Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- Oxycerites, Genus Oxycerites Imlay, 1953 † (OPPELIIDAE) (FOSSIL)
- Oxycheilus, syn of: Genus Synapterpes H.A. Pilsbry, 1896 (SUBULINIDAE)
- OXYCHILIDAE Hesse, 1927 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-PULMONATA [Infraclass]-STYLOMMATOPHORA [Order]-GASTRODONTOIDEA [Superfamily])
- Oxychilops, syn of: Genus Oxychilus L.I. Fitzinger, 1833 (OXYCHILIDAE)
- Oxychilus, Genus Oxychilus L.I. Fitzinger, 1833 (OXYCHILIDAE)
- Oxychona, Genus Oxychona O.A.L. Mörch, 1852 (BULIMULIDAE)
- oxychone, Vanikoro oxychone O.A.L. Mörch, 1877 - (VANIKORIDAE)
- oxyclathra, Clathurella oxyclathra E.C. Von Martens, 1880 - syn of: Tritonoturris scalaris (R.B. Hinds, 1843) - (CLATHURELLIDAE)
- oxyclathrus, Tritonoturris oxyclathrus E.C. Von Martens, 1880 - syn of: Tritonoturris scalaris (R.B. Hinds, 1843) - (RAPHITOMIDAE)
- oxyclathrus, Pleurotoma oxyclathrus E.C. Von Martens, 1880 - syn of: Tritonoturris scalaris (R.B. Hinds, 1843) - (TURRIDAE)
- Oxyclymenia, syn of: Genus Clymenia Münster, 1834 (CLYMENIIDAE) (FOSSIL)
- oxycona, Solariella oxycona E.A. Smith, 1899 - syn of: Tubiola subdisjuncta (H. Adams, 1868) - (SOLARIELLIDAE)
- oxyconum, Fanninoceras oxyconum Hillebrandt, 1981 † - syn of: Fanninoceras carlottense McLearn, 1930 † - (EODEROCERATIDAE) (FOSSIL)
- oxyconus, Acrocoelites oxyconus (Hehl, 1831 †) - (MEGATEUTHIDIDAE) (FOSSIL)
- oxycyma, Tyrannophaedusa oxycyma (H.A. Pilsbry, 1902) - (CLAUSILIIDAE)
- Oxycypraea, Genus Oxycypraea Schilder, 1927 (EOCYPRAEIDAE)
- oxydactyla, Aporrhais oxydactyla (C.L.F. von Sandberger, 1861 †) - (APORRHAIDAE) (FOSSIL)
- oxydentale, Imitoceras oxydentale Bockwinkel & Ebbighausen, 2006 † - (PRIONOCERATIDAE) (FOSSIL)
- Oxydiscites, Genus Oxydiscites Mesezhnikov, 1976 † (OPPELIIDAE) (FOSSIL)
- Oxydiscus, syn of: Genus Tropidodiscus Meek & Worthen, 1866 † (TROPIDODISCIDAE) (FOSSIL)
- Oxyeurax, Genus Oxyeurax Gardner & Campbell, 2007 † (ASTARTIDAE) (FOSSIL)
- oxyformis, Achatinella sowerbyana oxyformis W. Newcomb - (ACHATINELLIDAE)
- oxyglyptus, Antillophos oxyglyptus (W.H. Dall & C.T. Simpson, 1901) - (NASSARIIDAE)
- oxygona, Ceratotheca oxygona Novák, 1891 † - (CERATOTHECIDAE) (FOSSIL)
- Oxygonioceras, Genus Oxygonioceras Foerste, 1925 † (BREVICOCERATIDAE) (FOSSIL)
- oxygonius, Illex oxygonius C.F.E. Roper, C.C. Lu & C. Mangold, 1969 - (OMMASTREPHIDAE)
- oxygonum, Acrosterigma oxygonum (G.B. II Sowerby, 1834) - (CARDIIDAE)
- oxygonum, Pecten oxygonum Sowerby, 1850 † - syn of: Argopecten thetidis (Sowerby, 1850 †) - (PECTINIDAE) (FOSSIL)
- oxygonum optimum, Pecten oxygonum optimum J. Brown & H.A. Pilsbry, 1913 J. Brown & H.A. Pilsbry, 1913 - syn of: Argopecten thetidis optimum J. Brown & H.A. Pilsbry, 1913 - (PECTINIDAE)
- Oxygyrus, Genus Oxygyrus W.H. Benson, 1835 (ATLANTIDAE)
- oxylabris, Naesiotus oxylabris (A. Doering, 1879) - (BULIMULIDAE)
- oxylabris, Protoglyptus oxylabris A. Doering, 1879 - syn of: Naesiotus oxylabris (A. Doering, 1879) - (ORTHALICIDAE)
- Oxylenticeras, Genus Oxylenticeras Schindewolf, 1952 † (OPPELIIDAE) (FOSSIL)
- Oxylinus, syn of: Genus Phorcus A. Risso, 1826 (TROCHIDAE)
- oxylobatum, Knightoceras oxylobatum Miller & Downs, 1948 † - (KONINCKIOCERATIDAE) (FOSSIL)
- Oxyloma, Genus Oxyloma C.A. Westerlund, 1885 (SUCCINEIDAE)
- Oxylongobardites, Genus Oxylongobardites Monnet & Bucher, 2005 † (LONGOBARDITIDAE) (FOSSIL)
- Oxymelania, Subgenus Pachychilus (Oxymelania) P. Fischer & J.C.H. Crosse, 1892 (PACHYCHILIDAE)
- Oxymeris, Genus Oxymeris W.H. Dall, 1903 (TEREBRIDAE)
- Oxynaia, Genus Oxynaia F. Haas, 1913 (UNIONIDAE)
- Oxynautilus, Genus Oxynautilus Mojsisovics, 1902 † (SYRINGONAUTILIDAE) (FOSSIL)
- Oxynoe, Genus Oxynoe C.S. Rafinesque, 1814 (OXYNOIDAE)
- OXYNOIDAE Stoliczka, 1868 - Family (GASTROPODA-HETEROBRANCHIA [Subclass]-OPISTHOBRANCHIA [Infraclass]-SACOGLOSSA [Order]-OXYNOACEA [Suborder]-OXYNOOIDEA [Superfamily])
- Oxynoticeras, Genus Oxynoticeras Hyatt, 1875 † (OXYNOTICERATIDAE) (FOSSIL)
- OXYNOTICERATIDAE Hyatt, 1875 † - Family (CEPHALOPODA-AMMONOIDEA [Subclass]-AMMONITIDA [Order]-PSILOCERATOIDEA [Superfamily]) (FOSSIL)
- Oxynoticeroides, Genus Oxynoticeroides Dommergues & al., 1986 † (OXYNOTICERATIDAE) (FOSSIL)
- oxynotum, Acutimitoceras acutum oxynotum Bartzsch & Weyer, 1996 † - (GATTENDORFIIDAE) (FOSSIL)
- oxynotum, Oxynoticeras oxynotum (F.A. von Quenstedt, 1843 †) - (OXYNOTICERATIDAE) (FOSSIL)
- oxynotum, Platyceras oxynotum Girty, 1929 † - (PLATYCERATIDAE) (FOSSIL)
- oxynotus, Agoniatites oxynotus Wedekind, 1918 † - syn of: Agoniatites obliquus (Whidborne, 1890 †) - (AGONIATITIDAE) (FOSSIL)
- oxynotus, Pseudowenites oxynotus Chao, 1959 † - syn of: Owenites koeneni A. Hyatt & Smith, 1905 † - (MELAGATHICERATIDAE) (FOSSIL)
- oxynotus, Paravishnuites oxynotus Spath, 1935 † - (OPHICERATIDAE) (FOSSIL)
- oxynotus, Paroxycerites oxynotus (H.A. Leanza, 1946 †) - (OPPELIIDAE) (FOSSIL)
- Oxyorthalicus, Subgenus Porphyrobaphe (Oxyorthalicus) H. Strebel, 1909 (ORTHALICIDAE)
- Oxyparoniceras, syn of: Genus Jacobella Jeannet , 1908 † (HILDOCERATIDAE) (FOSSIL)
- Oxyperas, Genus Oxyperas O.A.L. Mörch, 1853 (MACTRIDAE)
- oxyphyllum, Pinacoceras oxyphyllum Mojsisovics, 1873 † - syn of: Placites oxyphyllus (Mojsisovics, 1873 †) - (PINACOCERATIDAE) (FOSSIL)
- oxyphyllus, Placites oxyphyllus (Mojsisovics, 1873 †) - (GYMNITIDAE) (FOSSIL)
- oxyphyllus, Prolobites oxyphyllus C.N. Lange, 1929 † - syn of: Prolobites delphinus (C.L.F. von Sandberger, 1856 †) - (PROLOBITIDAE) (FOSSIL)
- oxypomatica, Heterozaptyx oxypomatica H.A. Pilsbry, 1908 - (CLAUSILIIDAE)
- Oxyprora, Genus Oxyprora Hoare & al., 2002 † (BRANSONIIDAE) (FOSSIL)
- oxyptera, Rostellaria oxyptera H.E. Anton, 1839 † - (ROSTELLARIIDAE) (FOSSIL)
- Oxypteria, Genus Oxypteria Waagen, 1907 † (PTERIIDA (UNASSIGNED)) (FOSSIL)
- oxyptycha, Collotia oxyptycha M. von Neumayr, 1870 † - syn of: Kellawaysites oxyptychus (M. von Neumayr, 1870 †) - (REINECKEIIDAE) (FOSSIL)
- oxyptychus, Kellawaysites oxyptychus (M. von Neumayr, 1870 †) - (REINECKEIIDAE) (FOSSIL)
- oxyptychus paronai, Kellawaysites oxyptychus paronai (Petitclerc, 1927 †) - (REINECKEIIDAE) (FOSSIL)
- Oxypyrgula, Subgenus Turricaspia (Oxypyrgula) B.M. Logvinenko & Y.I. Starobogatov, 1969 (HYDROBIIDAE)
- Oxyrhombus, Subgenus Helicina (Oxyrhombus) P. Fischer & J.C.H. Crosse, 1893 (HELICINIDAE)
- oxyrhyncha, Oxyrhombus oxyrhyncha (J.C.H. Crosse & E.O. Debeaux, 1863) - (HELICINIDAE)
- oxyrhyncha, Nuculana oxyrhyncha R.A. Philippi, 1887 † - (NUCULANIDAE) (FOSSIL)
- oxyrhyncha, Lanceolaria oxyrhyncha E.C. Von Martens, 1861 - (UNIONIDAE)
- oxyrhyncha cuspidata, Lanceolaria oxyrhyncha cuspidata J.T. Kuroda - (UNIONIDAE)
- oxyrhyncha cuspidata, Lanceolaria oxyrhyncha cuspidata T. Kira, 1959 - syn of: Lanceolaria grayana (I. Lea, 1834) - (UNIONIDAE)
- oxyrhynchus, Unio oxyrhynchus E.C. Von Martens, 1861 - syn of: Lanceolaria oxyrhyncha E.C. Von Martens, 1861 - (UNIONIDAE)
- oxyrhynchus, Unio oxyrhynchus L. Brevière, 1882 - syn of: Unio arcuatus N.R. Bouchard-Chantereaux, 1838 - (UNIONIDAE)
- oxys, Cerithiopsis oxys P. Bartsch, 1911 - (CERITHIOPSIDAE)
- oxyspira, Helix oxyspira J.F. Babor, 1897 † - syn of: Leucochroopsis apicalis (A.E. Reuss, 1861 †) - (HELICIDAE) (FOSSIL)
- oxyspira, Hygromia oxyspira J.F. Babor, 1897 † - syn of: Leucochroopsis apicalis (A.E. Reuss, 1861 †) - (HYGROMIIDAE) (FOSSIL)
- Oxyspira, Genus Oxyspira Blodgett & Johnson, 1992 (MEEKOSPIRIDAE) (FOSSIL)
- oxyspira, Olivella oxyspira A.E.M. Cossmann, 1896 † - (OLIVELLIDAE) (FOSSIL)
- Oxystele, Genus Oxystele R.A. Philippi, 1847 (TROCHIDAE)
- oxystoma, Idyla bicristata oxystoma (E.A. Rossmässler, 1839) - (CLAUSILIIDAE)
- oxystoma, Parachloraea oxystoma (Thomä, 1845 †) - (HELICIDAE) (FOSSIL)
- oxystoma, Gyraulus oxystoma (E. Klein, 1846 ) - (PLANORBIDAE)
- oxystoma, Vitrea oxystoma C.A. Westerlund, 1888 - syn of: Vitrea subrimata (O.W.H. Reinhardt, 1871) - (PRISTILOMATIDAE)
- oxystoma, Micraenigma oxystoma S.S. Berry, 1953 - (SCAPHANDRIDAE)
- oxystomum, Phacoceras oxystomum (B. Phillips, 1836 †) - (CENTROCERATIDAE) (FOSSIL)
- oxystomus, Arcestes oxystomus Mojsisovics, 1875 † - (ARCESTIDAE) (FOSSIL)
- Oxystrombus, syn of: Genus Liguus P.D. Montfort, 1810 (ORTHALICIDAE)
- Oxystyla, syn of: Genus Orthalicus H.H. Beck, 1837 (ORTHALICIDAE)
- Oxystylus, syn of: Genus Orthalicus H.H. Beck, 1837 (ORTHALICIDAE)
- oxytata, Melanella oxytata (R.B. Watson, 1883) - (EULIMIDAE)
- oxytata, Mangilia oxytata K.J. Bush, 1885 - syn of: Nannodiella vespuciana (A.V.M.D. D'Orbigny, 1847) - (MANGELIIDAE)
- oxytata, Muricopsis oxytata M. Smith, 1938 - syn of: Murexsul oxytatus (M. Smith, 1938) - (MURICIDAE)
- oxytata, Volvulella oxytata (K.J. Bush, 1885) - (RHIZORIDAE)
- oxytata dodona, Volvulella oxytata dodona J. Gardner, 1937 † - (RHIZORIDAE) (FOSSIL)
- oxytatus, Murexsul oxytatus (M. Smith, 1938) - (MURICIDAE)
- oxytenes, Mucronalia oxytenes J.C. Melvill, 1904 - (EULIMIDAE)
- oxytenes, Pleurodonte oxytenes H.A. Pilsbry, 1889 - (PLEURODONTIDAE)
- oxytera, Pleurotomaria oxytera Hudleston † - (PLEUROTOMARIIDAE) (FOSSIL)
- oxytes, Oxytesta oxytes (W.H. Benson, 1831) - (ARIOPHANTIDAE)
- Oxytes, syn of: Genus Oxytesta A. Zilch, 1956 (ARIOPHANTIDAE)
- Oxytesta, Genus Oxytesta A. Zilch, 1956 (ARIOPHANTIDAE)
- OXYTEUTHIDAE - syn of Family: OXYTEUTHIDIDAE (FOSSIL)
- OXYTEUTHIDIDAE Stolley, 1919 † - Family (CEPHALOPODA-COLEOIDEA [Subclass]-BELEMNITIDA [Order]) (FOSSIL)
- Oxyteuthis, Genus Oxyteuthis Stolley, 1911 † (OXYTEUTHIDIDAE) (FOSSIL)
- Oxytibetites, Genus Oxytibetites Tozer , 1994 † (TIBETITIDAE) (FOSSIL)
- Oxytoma, Genus Oxytoma Meek, 1864 † (OXYTOMIDAE) (FOSSIL)
- oxytomaeformis, Neopecten oxytomaeformis Bychkov, 1985 † - (AVICULOPECTINIDAE) (FOSSIL)
- oxytomaeformis, Meleagrinella oxytomaeformis Polubotko, 1968 † - (OXYTOMIDAE) (FOSSIL)
- OXYTOMIDAE Ichikawa, 1958 † - Family (BIVALVIA-PTERIOMORPHIA [Subclass]-PECTINIDA [Order]-OXYTOMOIDEA [Superfamily]) (FOSSIL)
- Oxytomoidea, Genus Oxytomoidea Pojeta et al., 1986 † (PTERINEIDAE) (FOSSIL)
- Oxytornoceras, Genus Oxytornoceras Becker , 1993 † (TORNOCERATIDAE) (FOSSIL)
- Oxytrema, Subgenus Pleurocera (Oxytrema) C.S. Rafinesque, 1819 ? (PLEUROCERIDAE)
- oxytremum, Chondropoma oxytremum (J. Gundlach in L. Pfeiffer, 1860) - (POMATIIDAE)
- Oxytropa, syn of: Genus Polystira W.P. Woodring, 1928 (TURRIDAE)
- oxytropida, Theodoxus oxytropida (N.I. Andrusov, 1909 †) - (NERITIDAE) (FOSSIL)
- Oxytropidoceras, Genus Oxytropidoceras Stieler , 1920 † (BRANCOCERATIDAE) (FOSSIL)
- oxytropidoceratoides, Elobiceras oxytropidoceratoides F. Haas, 1942 † - (BRANCOCERATIDAE) (FOSSIL)
- oxytropis, Psilaxis oxytropis (A. Adams, 1855) - (ARCHITECTONICIDAE)
- oxytropis, Philippia oxytropis A. Adams, 1855 - syn of: Psilaxis oxytropis (A. Adams, 1855) - (ARCHITECTONICIDAE)
- oxytropis, Ganesella oxytropis (O.F. von Möllendorff, 1901) - (CAMAENIDAE)
- oxytropis, Geophorus oxytropis (J.E. Gray, 1839) - (HELICINIDAE)
- oxytropis, Helicina oxytropis G.B. Sowerby, 1838 - (HELICINIDAE)
- oxytropis, Hystricella oxytropis (R.T. Lowe, 1831) - (HYGROMIIDAE)
- oxytropis, Lacuna oxytropis H.A. Pilsbry, 1895 - (LITTORINIDAE)
- oxytropis, Basilissopsis oxytropis (R.B. Watson, 1879) - (SEGUENZIIDAE)
- oxytropis, Polystira oxytropis (G.B. I Sowerby, 1834) - (TURRIDAE)
- oxytropis, Viviparus oxytropis W.H. Benson, 1836 - (VIVIPARIDAE)
- oxytropis albicarinata, Polystira oxytropis albicarinata (G.B. III Sowerby, 1870) - (TURRIDAE)
- oxytropis subcarinatula, Hystricella oxytropis subcarinatula (T.V. Wollaston, 1878) - (HYGROMIIDAE)
- oxytropoides, Paludina oxytropoides P.M. Heude, 1889 - (VIVIPARIDAE)
- Oxytus, Genus Oxytus Sysoev, 1968 † (AMITIDAE) (FOSSIL)
- Oxyussuria, Genus Oxyussuria Tozer , 1994 † (USSURIIDAE) (FOSSIL)
- Oyama, syn of: Genus Cretaspira J.T. Kuroda & K. Oyama, 1971 (PSEUDOMELATOMIDAE)
- oyamadensis, Truncacila oyamadensis K. Hirayama, 1955 † - (NUCULIDAE) (FOSSIL)
- oyamai, Amathina oyamai O. Masuda & H. Noda, 1976 - (AMATHINIDAE)
- oyamai, Ancilla oyamai T. Shuto, 1959 † - (ANCILLARIIDAE) (FOSSIL)
- oyamai, Architectonica oyamai O. Masuda & H. Noda, 1976 - (ARCHITECTONICIDAE)
- oyamai, Balatonites oyamai Bando, 1964 † - (BALATONITIDAE) (FOSSIL)
- oyamai, Suavodrillia oyamai K. Chinzei, 1959 † - (BORSONIIDAE) (FOSSIL)
- oyamai, Tutufella oyamai (T. Habe, 1973) - (BURSIDAE)
- oyamai, Cyclocardia oyamai A.I. Kafanov, K. Ogasawara & K. Amano, 1999 † - (CARDITIDAE) (FOSSIL)
- oyamai, Conus oyamai Tomida, 1989 † - (CONIDAE) (FOSSIL)
- oyamai, Truncacteocina oyamai J.T. Kuroda & T. Habe, 1954 - syn of: Truncacteocina arata (R.B. Watson, 1883) - (CYLICHNIDAE)
- oyamai, Diplommatina pudica oyamai T. Habe, 1943 - (DIPLOMMATINIDAE)
- oyamai, Yayoiacmea oyamai (T. Habe, 1955) - (LOTTIIDAE)
- oyamai, Leucosphaera oyamai (T. Habe, 1962) - (LUCINIDAE)
- oyamai, Hirtomurex oyamai S. Kosuge, 1985 - (MURICIDAE)
- oyamai, Modiolatus oyamai (T. Habe, 1981) - (MYTILIDAE)
- oyamai, Arcopsis oyamai T. Habe, 1953 - syn of: Striarca symmetrica (L.A. Reeve, 1844) - (NOETIIDAE)
- oyamai, Otitoma oyamai (T. Shuto, 1965 †) - (PSEUDOMELATOMIDAE) (FOSSIL)
- oyamai, Zebinella oyamai Itoigawa & Nishimoto, 1984 † - (RISSOINIDAE) (FOSSIL)
- oyamai, Macoma oyamai T. Kira, 1959 - syn of: Heteromacoma irus (S.C.T. Hanley, 1845) - (TELLINIDAE)
- oyamai, Heteromacoma oyamai T. Kira, 1959 - syn of: Heteromacoma irus (S.C.T. Hanley, 1845) - (TELLINIDAE)
- oyamai, Thyasira oyamai T. Habe, 1962 - (THYASIRIDAE)
- oyamai mortoni, Amathina oyamai mortoni W.F. Ponder, 1987 - (AMATHINIDAE)
- oyashio, Obesotoma oyashio T. Shikama, 1962 - (MANGELIIDAE)
- oyasionensis, Amaea oyasionensis (H. Ozaki, 1958) - (EPITONIIDAE)
- oyasiwo, Odostomia oyasiwo S. Nomura, 1939 - (PYRAMIDELLIDAE)
- oyeni, Searlesia oyeni F.W. Harmer, 1914 † - (BUCCINIDAE) (FOSSIL)
- oyeni, Amauropsis oyeni Harmer † - (NATICIDAE) (FOSSIL)
- oyensi, Neocrimites oyensi (Haniel, 1915 †) - (ADRIANITIDAE) (FOSSIL)
- oyensi, Crimites oyensi Haniel, 1915 † - syn of: Neocrimites oyensi (Haniel, 1915 †) - (ADRIANITIDAE) (FOSSIL)
- oyensi, Demarezites oyensi (Gerth, 1950 †) - (CYCLOLOBIDAE) (FOSSIL)
- oyensi, Xenodiscus oyensi Welter, 1922 † - syn of: Nyalamites angustecostatus (Welter, 1922 †) - (MEEKOCERATIDAE) (FOSSIL)
- oyglyptus, Antillophos oyglyptus W.H. Dall & C.T. Simpson, 1901 - syn of: Antillophos oxyglyptus (W.H. Dall & C.T. Simpson, 1901) - (NASSARIIDAE)
- oyomai, Anadara oyomai T. Habe - (ARCIDAE)
- oyonnaxia, Abida oyonnaxia É.A.A. Locard, 1881 - syn of: Abida secale (J.P.R. Draparnaud, 1801) - (CHONDRINIDAE)
- oytarensis, Osculigera oytarensis Lan & Wei 1995 † - (RADIOLITIDAE) (FOSSIL)
- oyuana, Ithycythara oyuana (M. Yokoyama, 1922) - (MANGELIIDAE)
- Ozaena, syn of: Genus Eledone W.E. Leach, 1817 (OCTOPODIDAE)
- ozakii, Tropaeum ozakii Obata & Matsukawa, 2007 † - (ANCYLOCERATIDAE) (FOSSIL)
- ozakii, Lophospira ozakii Endo, 1935 † - (LOPHOSPIRIDAE) (FOSSIL)
- ozakii, Entemnotrochus ozakii T. Kase & Katayama, 1981 † - (PLEUROTOMARIIDAE) (FOSSIL)
- ozanneana, Turbonilla ozanneana L.G. Hertlein & A.M. Strong, 1951 - (PYRAMIDELLIDAE)
- ozarkana, Eophysema ozarkana † - (LUCINIDAE) (FOSSIL)
- ozarkense, Paracravenoceras ozarkense W.J. Gordon, 1960 † - (GLAPHYRITIDAE) (FOSSIL)
- ozarkense, Peripetoceras ozarkense W.J. Gordon, 1964 † - (LIROCERATIDAE) (FOSSIL)
- ozarkensis, Aviculopecten ozarkensis Snider, 1915 † - (AVICULOPECTINIDAE) (FOSSIL)
- ozarkensis, Rabdotus dealbatus ozarkensis H.A. Pilsbry & J.H. Ferriss, 1906 - (BULIMULIDAE)
- ozarkensis, Marstonia ozarkensis (A. Hinkley, 1915) - (HYDROBIIDAE)
- ozarkensis, Hypseloconus ozarkensis Ulrich & al., 1931 † - (HYPSELOCONIDAE) (FOSSIL)
- ozarkensis, Elimia potosiensis ozarkensis R.E. Call, 1886 - (PLEUROCERIDAE)
- ozarkensis, Fusconaia ozarkensis (R.E. Call, 1887) - (UNIONIDAE)
- ozarkensis, Mesomphix cupreus ozarkensis H.A. Pilsbry & J.H. Ferriss, 1907 - (ZONITIDAE)
- Ozarkina, Genus Ozarkina Ulrich & al., 1931 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Ozarkispira, syn of: Genus Ophileta Vanuxem, 1842 † (OPHILETIDAE) (FOSSIL)
- Ozarkocanus, Genus Ozarkocanus Heller 1956 † (ARCHAEOGASTROPODA (UNASSIGNED)) (FOSSIL)
- Ozarkoconus, Genus Ozarkoconus Heller , 1954 † (HYPSELOCONIDAE) (FOSSIL)
- Ozarkplina, Genus Ozarkplina Stinchcomb , 1986 † (TRYBLIDIIDAE) (FOSSIL)
- ozawai, Acteon ozawai Y. Otuka, 1938 † - (ACTEONIDAE) (FOSSIL)
- ozawai, Plicifusus ozawai M. Yokoyama, 1926 † - (BUCCINIDAE) (FOSSIL)
- ozawai, Bittium ozawai M. Yokoyama, 1926 † - syn of: Batillaria zonalis cumingii (J.C.H. Crosse, 1862) - (CERITHIIDAE) (FOSSIL)
- ozawai, Eulima ozawai M. Yokoyama, 1927 - (EULIMIDAE)
- ozawai, Boucotspira ozawai (O. Kobayashi, 1930 †) - (HELICOTOMIDAE) (FOSSIL)
- ozawai, Thyasira ozawai M. Yokoyama, 1926 - (THYASIRIDAE)
- ozawai, Trochonema ozawai Kobayashi, 1930 † - syn of: Boucotspira ozawai (O. Kobayashi, 1930 †) - (TROCHONEMATIDAE) (FOSSIL)
- ozawai, Turbo ozawai Y. Otuka, 1938 † - (TURBINIDAE) (FOSSIL)
- ozenneana, Pascula ozenneana (J.C.H. Crosse, 1861) - (MURICIDAE)
- Ozodochilus, Genus Ozodochilus A.E.M. Cossmann, 1918 (TROCHIDAE)
- ozodona, Oliva panniculata ozodona P.L. Duclos, 1835 - (OLIVIDAE)
- Ozomia, syn of: Genus Ribeiria Sharpe, 1853 † (RIBEIRIIDAE) (FOSSIL)
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