- Osvaldoginella, Genus Osvaldoginella J. Espinosa & J.A. Ortea, 1997 (CYSTISCIDAE)
- oswaldi, Tornatellides oswaldi C.M. Cooke & Y. Kondo, 1961 - (ACHATINELLIDAE)
- oswaldi, Achatinella bulimoides oswaldi D.A. Welch, 1958 - (ACHATINELLIDAE)
- oswaldi, Amastra oswaldi C.M. Cooke, 1933 - (AMASTRIDAE)
- oswaldi, Venericardia oswaldi Sokolov † - (CARDITIDAE) (FOSSIL)
- oswegoensis, Tentaculites oswegoensis F.B. Meek & A.H. Worthen, 1865 † - (TENTACULITIDAE) (FOSSIL)
- osyoro, Cuthonella osyoro (K. Baba, 1940) - (FIONIDAE)
- osyoro, Guyvalvoria osyoro (K. Baba, 1940) - syn of: Cuthonella osyoro (K. Baba, 1940) - (FIONIDAE)
- osyuensis, Turbonilla osyuensis S. Nomura, 1936 - (PYRAMIDELLIDAE)
- otaeguii, Oliva otaeguii R.A. Philippi, 1887 † - syn of: Olivancillaria claneophila (P.L. Duclos, 1835 †) - (OLIVIDAE) (FOSSIL)
- otagoensis, Cominella otagoensis (H.J. Finlay, 1926) - (BUCCINIDAE)
- otagoensis, Aeneator otagoensis H.J. Finlay, 1930 - (BUCCINIDAE)
- otagoensis, Euthrenopsis otagoensis A.W.B. Powell, 1929 - (BUCCINIDAE)
- otagoensis, Eucominia otagoensis H.J. Finlay, 1926 - syn of: Cominella otagoensis (H.J. Finlay, 1926) - (BUCCINIDAE)
- otagoensis, Zeadmete otagoensis R.K. Dell, 1956 - (CANCELLARIIDAE)
- otagoensis, Hamacuna otagoensis (A.W.B. Powell, 1927) - (CONDYLOCARDIIDAE)
- otagoensis, Splendrillia otagoensis A.W.B. Powell, 1942 - (DRILLIIDAE)
- otagoensis, Melanella otagoensis (A.W.B. Powell, 1927) - (EULIMIDAE)
- otagoensis, Monodilepas otagoensis H.J. Finlay, 1930 - (FISSURELLIDAE)
- otagoensis, Aoteadrillia otagoensis A.W.B. Powell, 1942 - (HORAICLAVIDAE)
- otagoensis, Leptochiton otagoensis (T. Iredale & A.F.B. Hull, 1929) - (LEPTOCHITONIDAE)
- otagoensis, Antiguraleus otagoensis A.W.B. Powell, 1942 - (MANGELIIDAE)
- otagoensis, Mesoginella otagoensis (R.K. Dell, 1956) - (MARGINELLIDAE)
- otagoensis, Cabestana otagoensis A.W.B. Powell, 1954 - syn of: Cabestana tabulata (K.T. Menke, 1843) - (RANELLIDAE)
- otagoensis, Rhytida otagoensis A.W.B. Powell, 1930 - (RHYTIDIDAE)
- otagoensis, Pusillina otagoensis (R.K. Dell, 1956) - (RISSOIDAE)
- otagoensis, Haurakia otagoensis (R.K. Dell, 1956) - syn of: Pusillina otagoensis (R.K. Dell, 1956) - (RISSOIDAE)
- otagoensis, Scaphander otagoensis R.K. Dell, 1956 - (SCAPHANDRIDAE)
- otagoensis, Lissotesta otagoensis R.K. Dell, 1956 - (SEGUENZIOIDEA (unassigned))
- otagoensis, Genaxinus otagoensis (H.H. Suter, 1913 †) - (THYASIRIDAE) (FOSSIL)
- otagoensis, Thyasira otagoensis H.H. Suter, 1913 † - syn of: Genaxinus otagoensis (H.H. Suter, 1913 †) - (THYASIRIDAE) (FOSSIL)
- otagoensis, Notoficula otagoensis R.K. Dell, 1962 - (TRIVIIDAE)
- otagoensis cookiana, Aeneator otagoensis cookiana R.K. Dell, 1956 - (BUCCINIDAE)
- otaheitana, Ryssota otaheitana (A.E.J. Férussac, 1821) - (CHRONIDAE)
- otaheitana, Partula otaheitana (J.G. Bruguière, 1792) - (PARTULIDAE)
- otaheitana demesai, Ryssota otaheitana demesai P. Bartsch, 1938 - (CHRONIDAE)
- otaheitana depressa, Ryssota otaheitana depressa O.F. von Möllendorff, 1898 - (CHRONIDAE)
- otaheitana ovum, Ryssota otaheitana ovum (A. Valenciennes, 1827) - (CHRONIDAE)
- otaheitana samarensis, Ryssota otaheitana samarensis P. Bartsch, 1938 - (CHRONIDAE)
- otaheitense, Buccinum otaheitense L.W. Dillwyn, 1817 - syn of: Bullia othaeitensis (J.G. Bruguière, 1789) - (BUCCINIDAE)
- otahietana, Ryssota otahietana (A.E.J. Férussac, 1821) - (CHRONIDAE)
- otahitensis, Lyncina otahitensis G.H. Schubert & J.A. Wagner, 1829 - syn of: Lyncina ventriculus (J.B.P.A. Lamarck, 1810) - (CYPRAEIDAE)
- otahua, Besla otahua C.R. Laws, 1950 † - (PYRAMIDELLIDAE) (FOSSIL)
- otahuhuensis, Notoacmea otahuhuensis C.R. Laws, 1950 † - (LOTTIIDAE) (FOSSIL)
- otahuhuensis, Retusa otahuhuensis (C.R. Laws, 1950 †) - (RETUSIDAE) (FOSSIL)
- otahuica, Cuna otahuica C.R. Laws, 1950 † - (CONDYLOCARDIIDAE) (FOSSIL)
- otaiana, Coccopigya otaiana B.A. Marshall, 1986 † - (COCCULINIDAE) (FOSSIL)
- otaiana, Paphies otaiana Eagle, 2000 † - (MESODESMATIDAE) (FOSSIL)
- otaioensis, Margineulima otaioensis (C.R. Laws, 1933 †) - (EULIMIDAE) (FOSSIL)
- otaioensis, Polinices otaioensis J. Marwick, 1960 † - (NATICIDAE) (FOSSIL)
- otaioensis, Syrnola otaioensis (C.R. Laws, 1937 †) - (PYRAMIDELLIDAE) (FOSSIL)
- otaioensis, Agatha otaioensis C.R. Laws, 1940 † - (PYRAMIDELLIDAE) (FOSSIL)
- otaioensis, Cryptofusus otaioensis (Finlay, 1930 †) - (TURBINELLIDAE) (FOSSIL)
- otaioica, Callusaria otaioica (C.R. Laws, 1935 †) - (STRUTHIOLARIIDAE) (FOSSIL)
- otakauica, Eucominia otakauica A.W.B. Powell, 1946 - syn of: Cominella nassoides otakauica A.W.B. Powell, 1946 - (BUCCINIDAE)
- otakauica, Cominella nassoides otakauica A.W.B. Powell, 1946 - (BUCCINIDAE)
- otakauica, Curveulima otakauica (R.K. Dell, 1956) - (EULIMIDAE)
- otakauica, Liracraea otakauica A.W.B. Powell, 1942 - (MANGELIIDAE)
- otakauicus, Pyrgiscus otakauicus (C.R. Laws, 1937) - (PYRAMIDELLIDAE)
- otakavica, Cominella otakavica A.W.B. Powell, 1946 - (BUCCINIDAE)
- otakia, Powelliphanta traversi otakia A.W.B. Powell, 1946 - (RHYTIDIDAE)
- otakiana, Parakaliella otakiana (Y. Hirase, 1909) - (HELICARIONIDAE)
- Otala, Genus Otala H.C.F. Schumacher, 1817 (HELICIDAE)
- otamaensis, Aphanaia otamaensis C.O. Waterhouse, 1979 † - (ATOMODESMATIDAE) (FOSSIL)
- otamaringaense, Dentalium otamaringaense J. Marwick, 1926 † - (DENTALIIDAE) (FOSSIL)
- otamaringaensis, Ennucula otamaringaensis (J. Marwick, 1926 †) - (NUCULIDAE) (FOSSIL)
- otamatea, Sigapatella otamatea C.R. Laws, 1944 † - (CALYPTRAEIDAE) (FOSSIL)
- otamatea, Lyonsiella otamatea (C.R. Laws, 1939 †) - (LYONSIELLIDAE) (FOSSIL)
- otamatea, Linucula otamatea (C.R. Laws, 1941 †) - (NUCULIDAE) (FOSSIL)
- otamateaensis, Acteon otamateaensis C.R. Laws, 1941 † - (ACTEONIDAE) (FOSSIL)
- otamateaensis, Pleuromeris otamateaensis C.R. Laws, 1944 † - (CARDITIDAE) (FOSSIL)
- otamitensis, Maoritrigonia otamitensis (C.T. Trechmann, 1918 †) - (TRIGONIIDAE) (FOSSIL)
- otanii, Gudeodiscus emigrans otanii B. Páll-Gergely, 2013 - (PLECTOPYLIDAE)
- Otapiria, Genus Otapiria Marwick, 1935 † (MONOTIDAE) (FOSSIL)
- otapiriensis, Pleurotomaria otapiriensis Begg & J. Grant-Mackie, 2003 † - (PLEUROTOMARIIDAE) (FOSSIL)
- otareae, Sinployea otareae (A. Garrett, 1872) - (CHAROPIDAE)
- otareae, Irenella otareae A. Garrett - (HELICARIONIDAE)
- otaria, Ficopsis otaria (A.A. Olsson, 1928 †) - (FICIDAE) (FOSSIL)
- otaria, Pyrula otaria A.A. Olsson, 1928 † - syn of: Ficopsis otaria (A.A. Olsson, 1928 †) - (MELONGENIDAE) (FOSSIL)
- Otatara, Subgenus Eatonina (Otatara) W.F. Ponder, 1965 (CINGULOPSIDAE)
- otatsumei, Cyclocardia otatsumei S. Uozumi, 1955 † - (CARDITIDAE) (FOSSIL)
- otatumei, Yubariceras otatumei (E. Matsumoto, H. Saito & Fukada, 1957 †) - (ACANTHOCERATIDAE) (FOSSIL)
- otatumei, Romaniceras otatumei E. Matsumoto, H. Saito & Fukada, 1957 † - syn of: Yubariceras otatumei (E. Matsumoto, H. Saito & Fukada, 1957 †) - (ACANTHOCERATIDAE) (FOSSIL)
- Otavia, syn of: Genus Clanculus P.D. Montfort, 1810 (TROCHIDAE)
- otaviana, Danilia otaviana (F.J. Cantraine, 1835 †) - (CHILODONTIDAE) (FOSSIL)
- otcaloogensis, Unio otcaloogensis A. De Gregorio, 1914 - syn of: Dysnomia othcaloogensis (I. Lea, 1857) - (UNIONIDAE)
- otekaikensis, Yoldiella otekaikensis P.A. Maxwell, 1969 † - (YOLDIIDAE) (FOSSIL)
- oteroensis, Bellerophon oteroensis E.L. Yochelson, 1960 † - (BELLEROPHONTIDAE) (FOSSIL)
- oteroi, Vexillum oteroi (R. Salisbury & S. Gori, 2013) - (COSTELLARIIDAE)
- oteroi, Pusia oteroi R. Salisbury & S. Gori, 2013 - syn of: Vexillum oteroi (R. Salisbury & S. Gori, 2013) - (COSTELLARIIDAE)
- oteroi, Volvarina oteroi J. Espinosa, J.A. Ortea & G. Pérez-Dionis, 2014 - (MARGINELLIDAE)
- oteroi, Natica oteroi (F. Fernandes & E. Rolán, 1991) - (NATICIDAE)
- oteroi, Olivella pulchella oteroi M. Bermejo, 1979 - (OLIVELLIDAE)
- oteroi, Ammonicera oteroi E. Rolán, 1992 - (OMALOGYRIDAE)
- Otesia, syn of: Genus Vitrinula J.E. Gray in P.P. Carpenter, 1856 (ARIOPHANTIDAE)
- Otesiopsis, Subgenus Vitrinula (Otesiopsis) T. Habe, 1973 (ARIOPHANTIDAE)
- othaeitense, Buccinum othaeitense J.G. Bruguière, 1789 - syn of: Bullia othaeitensis (J.G. Bruguière, 1789) - (BUCCINIDAE)
- othaeitense, Bullia othaeitense J.G. Bruguière, 1789 - syn of: Bullia othaeitensis (J.G. Bruguière, 1789) - (NASSARIIDAE)
- othaeitensis, Bullia othaeitensis (J.G. Bruguière, 1789) - (NASSARIIDAE)
- othcaloogensis, Dysnomia othcaloogensis (I. Lea, 1857) - (UNIONIDAE)
- othello, Natica othello W.H. Dall, 1908 - (NATICIDAE)
- othemensis, Murchisonia othemensis Lindström, 1884 † - syn of: Ulrichospira othemensis (Lindström, 1884 †) - (MURCHISONIIDAE) (FOSSIL)
- othemensis, Ulrichospira othemensis (Lindström, 1884 †) - (PHANEROTREMATIDAE) (FOSSIL)
- othemensis, Pleurotomaria othemensis Lindström, 1884 † - syn of: Ulrichospira othemensis (Lindström, 1884 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- othnius, Kondoconcha othnius G.A. Solem, 1976 - (ENDODONTIDAE)
- othnius, Pteroluter othnius Saul, 1973 † - (MACTRIDAE) (FOSSIL)
- othonia, Oliva elegans othonia P.L. Duclos, 1835 - (OLIVIDAE)
- othonia, Mediterranea othonia J.R. Bourguignat, 1894 - syn of: Mediterranea hydatina (E.A. Rossmässler, 1838) - (OXYCHILIDAE)
- othoniana, Volutomitra othoniana (Finlay, 1924 †) - (VOLUTOMITRIDAE) (FOSSIL)
- otiakensis, Proxichione otiakensis P.A. Maxwell, 1978 † - (VENERIDAE) (FOSSIL)
- otianus, Lyriochlamys otianus (McLearn, 1939 †) - (PECTINIDAE) (FOSSIL)
- Otina, Genus Otina J.E. Gray, 1847 (OTINIDAE)
- OTINIDAE H. & A. Adams, 1855 - Family (GASTROPODA-HETEROBRANCHIA-PULMONATA-EUPULMONATA)
- Otinodoris, syn of: Genus Asteronotus C.G. Ehrenberg, 1831 (DISCODORIDIDAE)
- otiolum, Canarium otiolum T. Iredale, 1931 - syn of: Canarium labiatum (P.F. Röding, 1798) - (STROMBIDAE)
- Otiomyllon, Genus Otiomyllon Weisbord, 1962 † (TORNIDAE) (FOSSIL)
- otiosa, Horiostomella otiosa J. Perner, 1903 † - (SINUOPEIDAE) (FOSSIL)
- otiosum, Platyceras otiosum J. Perner, 1903 † - syn of: Hoplotropites jokelyi (J. Von Hauer, 1855 †) - (PLATYCERATIDAE) (FOSSIL)
- otiphorus, Chamalycaeus otiphorus (W.H. Benson, 1859) - (CYCLOPHORIDAE)
- otis, Labyrinthus otis (J. Lightfoot, 1786) - (CAMAENIDAE)
- otis, Polinices otis W.J. Broderip & Sowerby, 1829 - (NATICIDAE)
- otis, Natica otis W.J. Broderip & G.B. I Sowerby, 1829 - syn of: Polinices otis W.J. Broderip & Sowerby, 1829 - (NATICIDAE)
- otis, Otina otis W. Turton, 1819 - syn of: Otina ovata (T. Brown, 1827) - (OTINIDAE)
- otis orthorinus, Labyrinthus otis orthorinus H.A. Pilsbry, 1899 - (CAMAENIDAE)
- Otitoma, Genus Otitoma F.P. Jousseaume, 1898 (PSEUDOMELATOMIDAE)
- otnirocensis, Turbonilla otnirocensis L.G. Hertlein & A.M. Strong, 1951 - (PYRAMIDELLIDAE)
- Otoarpadites, Genus Otoarpadites Tozer , 1994 † (TRACHYCERATIDAE) (FOSSIL)
- Otoceltites, Genus Otoceltites Diener, 1916 † (THANAMITIDAE) (FOSSIL)
- Otoceras, Genus Otoceras Griesbach , 1880 † (OTOCERATIDAE) (FOSSIL)
- OTOCERATIDAE Hyatt, 1900 † - Family (CEPHALOPODA-AMMONOIDEA-CERATITIDA) (FOSSIL)
- otoceratoides, Pachyproptychites otoceratoides (Diener, 1895 †) - (PROPTYCHITIDAE) (FOSSIL)
- Otocheilus, syn of: Genus Lyria J.E. Gray, 1847 (VOLUTIDAE)
- Otoclymenia, Subgenus Kalloclymenia (Otoclymenia) Schindewolf, 1923 (GONIOCLYMENIIDAE) (FOSSIL)
- Otoconcha, Genus Otoconcha F.W. Hutton, 1884 (CHAROPIDAE)
- otoconsors, Pyrgiscilla otoconsors C.R. Laws, 1937 † - (PYRAMIDELLIDAE) (FOSSIL)
- otohime, Amalda otohime R. Majima, E. Tsuchida & K. Oshima, 1993 - (OLIVIDAE)
- otohimeae, Capulus otohimeae T. Habe, 1946 - (CAPULIDAE)
- otohimeae, Glyphostoma otohimeae S. Kosuge, 1981 - (CLATHURELLIDAE)
- otohimeae, Conasprella otohimeae (J.T. Kuroda & K. Itô, 1961) - (CONIDAE)
- otohimeae, Duodenticonus otohimeae (J.T. Kuroda & K. Itô, 1961) - syn of: Conasprella otohimeae (J.T. Kuroda & K. Itô, 1961) - (CONIDAE)
- otohimeae, Hipponix otohimeae T. Habe, 1946 - (HIPPONICIDAE)
- otohimeae, Pendaloma otohimeae (T. Habe, 1952) - (PERIPLOMATIDAE)
- otohimeae, Periploma otohimeae T. Habe, 1952 - syn of: Pendaloma otohimeae (T. Habe, 1952) - (PERIPLOMATIDAE)
- otohimeae, Rissoina otohimeae S. Kosuge, 1965 - (RISSOINIDAE)
- otohimei, Leucosyrinx otohimei H. Ozaki, 1958 - syn of: Aforia circinata (W.H. Dall, 1873) - (PSEUDOMELATOMIDAE)
- Otohoplites, Genus Otohoplites Steinmann , 1925 † (HOPLITIDAE) (FOSSIL)
- otoides, Eucalodium otoides F.G. Thompson, 1968 - (UROCOPTIDAE)
- Otoites, Genus Otoites Mascke, 1906 † (OTOITIDAE) (FOSSIL)
- OTOITIDAE Mascke, 1907 † - Family (CEPHALOPODA-AMMONOIDEA-AMMONITIDA) (FOSSIL)
- otokauica, Pyrgiscilla otokauica C.R. Laws, 1937 - syn of: Pyrgiscus otakauicus (C.R. Laws, 1937) - (PYRAMIDELLIDAE)
- Otollonia, Genus Otollonia W.P. Woodring, 1928 (LIOTIIDAE)
- otomana, Humboldtiana otomana K. Mejia, E. Naranjo-Garcia & O.J. Polaco, 2006 - (HUMBOLDTIANIDAE)
- Otomaroceras, Genus Otomaroceras Manda & Turek, 2009 † (HERCOCERATIDAE) (FOSSIL)
- otome, Dermatobranchus otome K. Baba, 1992 - (ARMINIDAE)
- otomoi, Stacheoceras otomoi Ehiro & al., 1986 † - (NEOSTACHEOCERATIDAE) (FOSSIL)
- otomorpha, Neritaria otomorpha E.A.L. Kittl, 1894 † - (NERITARIIDAE) (FOSSIL)
- Otomphalus, Genus Otomphalus Traub, 1979 † (PLEUROCERIIDAE) (FOSSIL)
- otopeta, Thurmanniceras otopeta Thieuloy, 1979 † - (NEOCOMITIDAE) (FOSSIL)
- Otopleura, Genus Otopleura P. Fischer, 1885 (PYRAMIDELLIDAE)
- Otopoma, Genus Otopoma J.E. Gray, 1850 (POMATIIDAE)
- Otoscaphites, Genus Otoscaphites Anderson, 1902 † (SCAPHITIDAE) (FOSSIL)
- Otosphinctes, Genus Otosphinctes Buckman , 1926 † (PERISPHINCTIDAE) (FOSSIL)
- otostoma, Opisthostoma otostoma O. Böttger, 1893 - (DIPLOMMATINIDAE)
- Otostoma, Genus Otostoma d'Archiac, 1859 † (NERITIDAE) (FOSSIL)
- otostoma, Vertigo otostoma C.A. Westerlund, 1871 - syn of: Vertigo pusilla O.F. Müller, 1774 - (VERTIGINIDAE)
- otostomus, Eurytus otostomus (L. Pfeiffer, 1855) - (AMPHIBULIMIDAE)
- Otostomus, Genus Otostomus H.H. Beck, 1837 (BULIMULIDAE)
- otostomus, Bulimus otostomus L. Pfeiffer, 1855 - syn of: Eurytus otostomus (L. Pfeiffer, 1855) - (BULIMULIDAE)
- otostomus, Pseudonapaeus otostomus C.A. Westerlund, 1898 - (ENIDAE)
- ototarana, Terelimella ototarana C.R. Laws, 1938 - (PYRAMIDELLIDAE)
- otra, Caryocorbula otra (E.V. Coan, 2002) - (CORBULIDAE)
- otreolata, Crepidula otreolata unknown - syn of: Crepidula lessonii (W.J. Broderip, 1834) - (CALYPTRAEIDAE)
- otsego, Retispira otsego (J.W. Hall, 1859 †) - (KNIGHTITIDAE) (FOSSIL)
- otsuensis, Ervilia otsuensis M. Yokoyama, 1920 - syn of: Coecella chinensis (G.P. Deshayes, 1855) - (SEMELIDAE)
- otsuensis, Bouchetriphora otsuensis (M. Yokoyama, 1920) - (TRIPHORIDAE)
- otsuensis, Triphora otsuensis M. Yokoyama, 1920 - syn of: Bouchetriphora otsuensis (M. Yokoyama, 1920) - (TRIPHORIDAE)
- otsukai, Eubostrychoceras otsukai (Yabe, 1904 †) - (NOSTOCERATIDAE) (FOSSIL)
- otsukai boulei, Eubostrychoceras otsukai boulei (M. Collignon, 1932 †) - (NOSTOCERATIDAE) (FOSSIL)
- ottawaensis, Cleionychia ottawaensis J.J.F. Whiteaves, 1908 † - (AMBONYCHIIDAE) (FOSSIL)
- ottawaensis, Holopea ottawaensis Wilson, 1951 † - (HOLOPEIDAE) (FOSSIL)
- ottawaensis, Eccyliopterus ottawaensis (Billings, 1860 †) - (LESUEURILLIDAE) (FOSSIL)
- ottawaensis, Cyrtostropha salteri ottawaensis Wilson, 1951 † - (MURCHISONIIDAE) (FOSSIL)
- ottawaensis, Ecculiomphalus ottawaensis Billings, 1860 † - syn of: Eccyliopterus ottawaensis (Billings, 1860 †) - (OPHILETIDAE) (FOSSIL)
- ottawanus, Micropileus ottawanus Wilson, 1951 † - (ARCHAEOPHIALIDAE) (FOSSIL)
- otterensis, Limipecten otterensis Easton, 1962 † - (AVICULOPECTINIDAE) (FOSSIL)
- otteri, Gregariella otteri T. Iredale, 1939 - syn of: Gregariella coralliophaga (J.F. Gmelin, 1791) - (MYTILIDAE)
- otthiana, Sphincterochila otthiana (E. Forbes, 1838) - (SPHINCTEROCHILIDAE)
- ottiliae, Mollistephanus ottiliae Galácz, 2015 † - (STEPHANOCERATIDAE) (FOSSIL)
- ottitoma, Otitoma ottitoma F.P. Jousseaume, 1898 - syn of: Otitoma cyclophora (G.P. Deshayes, 1863) - (PSEUDOMELATOMIDAE)
- ottitoma, Hemidaphne ottitoma F.P. Jousseaume, 1898 - syn of: Otitoma cyclophora (G.P. Deshayes, 1863) - (RAPHITOMIDAE)
- otto, Clymenia otto G.G. Münster, 1839 † - syn of: Kosmoclymenia otto (G.G. Münster, 1839 †) - (CLYMENIIDAE) (FOSSIL)
- otto, Kosmoclymenia otto (G.G. Münster, 1839 †) - (KOSMOCLYMENIIDAE) (FOSSIL)
- ottoi, Trishoplita ottoi H.A. Pilsbry, 1901 - (BRADYBAENIDAE)
- ottoi, Calliotropis ottoi (R.A. Philippi, 1844) - (CALLIOTROPIDAE)
- ottoi, Trochus ottoi R.A. Philippi, 1844 - syn of: Calliotropis ottoi (R.A. Philippi, 1844) - (TROCHIDAE)
- Ottoino, Genus Ottoino Palmer, 1947 † (RISSOIDAE) (FOSSIL)
- ottomoerchi, Turbonilla ottomoerchi L.G. Hertlein & A.M. Strong, 1951 - (PYRAMIDELLIDAE)
- Ottonia, Subgenus Aneitea (Ottonia) H.R. Simroth, 1918 (ATHORACOPHORIDAE)
- ottonis, Balatonites ottonis (von Buch, 1848 †) - (BALATONITIDAE) (FOSSIL)
- ottonis, Subzebrinus ottonis (O.F. von Möllendorff, 1902) - (ENIDAE)
- ottonis, Subzebrinus ottonis (R. Sturany, 1900) - syn of: Subzebrinus ottonis (O.F. von Möllendorff, 1902) - (ENIDAE)
- ottonis, Oleacina ottonis (L. Pfeiffer) - (OLEACINIDAE)
- ottonis, Chondrothyrella ottonis (L. Pfeiffer, 1846) - (POMATIIDAE)
- ottonis, Rhytidopoma wrightianum ottonis C. de la Torre & P. Bartsch, 1941 - (POMATIIDAE)
- ottonis riohondensis, Chondrothyrella ottonis riohondensis C. de la Torre & P. Bartsch, 1938 - (POMATIIDAE)
- Ottorosenia, Genus Ottorosenia I.V. Muratov, 1992 (ENIDAE)
- otukae, Chlamys otukae O. Masuda & Sawada, 1961 † - (PECTINIDAE) (FOSSIL)
- otukai, Calliostoma otukai N. Ikebe, 1942 - (CALLIOSTOMATIDAE)
- otukai, Rhinoclavis otukai (S. Nomura, 1935) - (CERITHIIDAE)
- otukai, Euspira otukai O. Masuda, 1956 † - syn of: Euspira meisensis J. Makiyama, 1926 † - (NATICIDAE) (FOSSIL)
- otukai, Pandora otukai T. Habe, 1952 - (PANDORIDAE)
- otukai, Philine otukai T. Habe, 1946 - (PHILINIDAE)
- otukai, Turbonilla otukai (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- otukai, Chemnitzia otukai S. Nomura, 1938 - syn of: Turbonilla otukai (S. Nomura, 1938) - (PYRAMIDELLIDAE)
- Otukaia, Genus Otukaia N. Ikebe, 1942 (CALLIOSTOMATIDAE)
- otvinensis, Clausilia dubia otvinensis H.T. von Gallenstein, 1895 - (CLAUSILIIDAE)
- otwayensis, Borsonia otwayensis A.E.M. Cossmann, 1896 - (BORSONIIDAE)
- otwayensis, Oreomava otwayensis (W.F. Petterd, 1879) - (CHAROPIDAE)
- otwayensis, Glacidorbis otwayensis W.F. Ponder & G.J. Avern, 2000 - (GLACIDORBIDAE)
- otwayensis, Austropyrgus otwayensis A. Clark, W.B. Miller & W.F. Ponder, 2003 - (HYDROBIIDAE)
- otwayensis, Pterochelus otwayensis (G.F. Harris, 1897 †) - (MURICIDAE) (FOSSIL)
- Ouagapia, syn of: Genus Ougapia J.C.H. Crosse, 1894 (RHYTIDIDAE)
- oualanensis, Delos oualanensis (W.H. Pease) - (RHYTIDIDAE)
- oualaniensis, Clithon oualaniensis (R.P. Lesson, 1831) - (NERITIDAE)
- oualaniensis, Sthenoteuthis oualaniensis (R.P. Lesson, 1830) - (OMMASTREPHIDAE)
- ouallensis, Bulimulus ouallensis A.S.H. Breure & Hovestadt, 2016 - (BULIMULIDAE)
- Ouamouia, Genus Ouamouia Campbell, 1984 † (KALENTERIDAE) (FOSSIL)
- ouaoufilalense, Posttornoceras ouaoufilalense W. Korn, Bockwinkel & Ebbighausen, 2016 † - (POSTTORNOCERATIDAE) (FOSSIL)
- ouaoufilalense, Geidoloceras ouaoufilalense Kröger, 2008 † - (PSEUDORTHOCERATIDAE) (FOSSIL)
- ouaoufilalensis, Ouaoufilalites ouaoufilalensis W. Korn & al., 2003 † - (PERICYCLIDAE) (FOSSIL)
- Ouaoufilalites, Genus Ouaoufilalites Korn & al., 2003 † (PERICYCLIDAE) (FOSSIL)
- ouarouroutense, Prionoceras ouarouroutense W. Korn, Bockwinkel & Ebbighausen, 2014 † - (PRIONOCERATIDAE) (FOSSIL)
- ouchitae, Microdrillia ouchitae G.F. Harris, 1937 † - (BORSONIIDAE) (FOSSIL)
- Oudardia, Genus Oudardia Monterosato, 1884 (TELLINIDAE)
- oudnoei, Mutela oudnoei C.D.E. König, 1826 - syn of: Mutela dubia J.F. Gmelin, 1793 - (IRIDINIDAE)
- oudrefica, Pseudamnicola oudrefica (A. Letourneux & J.R. Bourguignat, 1887) - (HYDROBIIDAE)
- ouenensis, Helicina ouenensis T.D.A. Cockerell, 1930 - (HELICINIDAE)
- ouensis, Bulimus ouensis J. Gassies, 1870 - syn of: Placostylus fibratus (T. Martyn, 1784) - (BULIMULIDAE)
- Ougapia, Genus Ougapia J.C.H. Crosse, 1894 (RHYTIDIDAE)
- ougarta, Wendtia ougarta (Petter, 1959 †) - (WERNEROCERATIDAE) (FOSSIL)
- ouini, Oliva ouini Y.I. Kantor & B. Tursch, 1998 - (OLIVIDAE)
- ouralica, Globodoma ouralica (de Verneuil, 1845 †) - (GOSSELETINIDAE) (FOSSIL)
- ouralica, Pleurotomaria ouralica de Verneuil, 1845 † - syn of: Globodoma ouralica (de Verneuil, 1845 †) - (PLEUROTOMARIIDAE) (FOSSIL)
- ouralicum, Cardium ouralicum Murchison & al., 1845 † - (CARDIIDAE) (FOSSIL)
- ouralicum, Arceodomus ouralicum (Murchison & al., 1845 †) - (CONOCARDIIDAE) (FOSSIL)
- ouralicus, Ptychosphaera ouralicus (Murchison & al., 1845 †) - (BELLEROPHONTIDAE) (FOSSIL)
- ourayensis, Bucanopsis ourayensis Gurley, 1884 † - syn of: Patellostium ourayensis (Gurley, 1884 †) - (BELLEROPHONTIDAE) (FOSSIL)
- ourayensis, Patellostium ourayensis (Gurley, 1884 †) - (BUCANIIDAE) (FOSSIL)
- ourense, Semisulcospira ourense H. Watanabe & Nishino, 1984 - (SEMISULCOSPIRIDAE)
- ouricuri, Verticordia ouricuri C.D. de Castro Oliveira & R.S. Absalão, 2010 - (VERTICORDIIDAE)
- oustense, Cheltonia oustense Rakús & Guex, 2002 † - (OXYNOTICERATIDAE) (FOSSIL)
- ousterea, Monacha ousterea J.R. Bourguignat - syn of: Eutheba cantiana (G. Montagu, 1803) - (HYGROMIIDAE)
- outaliana, Xerosecta guercifiana outaliana (P.M. Pallary, 1920) - (HYGROMIIDAE)
- outambensis, Sierraia outambensis D.S. Brown, 1988 - (BITHYNIIDAE)
- outis, Cingula outis (J.R. le B. Tomlin, 1931) - (RISSOIDAE)
- ouveana, Columbella ouveana R.P.J. Hervier, 1899 - syn of: Pyrene flava (J.G. Bruguière, 1789) - (COLUMBELLIDAE)
- ouveanus, Placostylus ouveanus (A. Mousson, 1869) - (BOTHRIEMBRYONTIDAE)
- ouveanus, Placostylus fibratus ouveanus (Dotzauer in A. Mousson, 1869) - (BOTHRIEMBRYONTIDAE)
- ouveanus, Bulimus ouveanus Dotzauer in A. Mousson, 1869 - syn of: Placostylus fibratus ouveanus (Dotzauer in A. Mousson, 1869) - (BULIMULIDAE)
- ouveanus alba, Bulimus ouveanus alba J.C.H. Crosse, 1874 - syn of: Placostylus fibratus ouveanus (Dotzauer in A. Mousson, 1869) - (BULIMULIDAE)
- ouveanus sinistorsa, Placostylus fibratus ouveanus sinistorsa (J.C.H. Crosse, 1884) - (BOTHRIEMBRYONTIDAE)
- ouveanus sinistrorsa, Bulimus ouveanus sinistrorsa J.C.H. Crosse, 1884 - syn of: Placostylus fibratus ouveanus sinistorsa (J.C.H. Crosse, 1884) - (BULIMULIDAE)
- ouveensis, Euplica ouveensis R.P.J. Hervier, 1899 - syn of: Euplica scripta (J.B.P.A. Lamarck, 1822) - (COLUMBELLIDAE)
- ouvezensis, Moitessieria ouvezensis H.D. Boeters & G. Falkner, 2009 - (MOITESSIERIIDAE)
- Ovachlamys, Genus Ovachlamys T. Habe, 1946 (HELICARIONIDAE)
- Ovactaeonina, syn of: Genus Callostracon G. Repetto & I. Bianco, 2012 (ACTEONIDAE)
- Ovactaeonina, Subgenus Colostracon (Ovactaeonina) Cossmann, 1895 † (ACTEONINIDAE) (FOSSIL)
- Ovacuna, Genus Ovacuna C.F. Laseron, 1953 (CONDYLOCARDIIDAE)
- Ovaginella, Genus Ovaginella C.F. Laseron, 1957 (MARGINELLIDAE)
- Ovalarca, Genus Ovalarca Woodring, 1925 † (NOETIIDAE) (FOSSIL)
- ovale, Euaspidoceras ovale (A. Neumann, 1907 †) - (ASPIDOCERATIDAE) (FOSSIL)
- ovale, Parvicardium ovale G.B. II Sowerby, 1841 - syn of: Parvicardium pinnulatum (T.A. Conrad, 1831) - (CARDIIDAE)
- ovale, Boreoceras ovale (Flower, 1964 †) - (COLUMBITIDAE) (FOSSIL)
- ovale, Dieneroceras ovale Chao, 1959 † - syn of: Dieneroceras tientungense (Chao, 1959 †) - (COLUMBITIDAE) (FOSSIL)
- ovale, Dentalium ovale Cooke, 1928 † - (DENTALIIDAE) (FOSSIL)
- ovale, Epitonium ovale (J. de C. Sowerby, 1844) - (EPITONIIDAE)
- ovale, Bythiospeum ovale (R. Dehm, 1951) - (HYDROBIIDAE)
- ovale, Glottoceras ovale Benavides-Caceres, 1956 † - (KNEMICERATIDAE) (FOSSIL)
- ovale, Paraoncidium ovale (C.G. Semper, 1885) - (ONCHIDIIDAE)
- ovale, Onchidium ovale C.G. Semper, 1885 - syn of: Paraoncidium ovale (C.G. Semper, 1885) - (ONCHIDIIDAE)
- ovale, Cryptochasma ovale T.L. Casey † - (PARALLELODONTIDAE) (FOSSIL)
- ovale, Sphaerium ovale A.E.J. Férussac, 1807 - syn of: Sphaerium nucleus (S.E. Studer, 1820) - (SPHAERIIDAE)
- ovale, Sphaerium ovale J.R. Bourguignat, 1864 - syn of: Musculium lacustre (O.F. Müller, 1774) - (SPHAERIIDAE)
- ovale, Tryblidium ovale R.P. Whitfield, 1886 † - (TRYBLIDIIDAE) (FOSSIL)
- Ovaleda, syn of: Genus Sarepta A. Adams, 1860 (SAREPTIDAE)
- ovaliformis, Uniformitheca ovaliformis Missarzhevsky & Mambetov, 1981 † - (TURCUTHECIDAE) (FOSSIL)
- ovalina, Cochlicopa ovalina G.P. Deshayes, 1857 - (COCHLICOPIDAE)
- ovalina, Corbula ovalina J.B.P.A. Lamarck, 1818 - (CORBULIDAE)
- ovalina, Corbicula ovalina G.P. Deshayes, 1854 - (CYRENIDAE)
- ovalina, Mactra ovalina L.A. Reeve, 1854 - syn of: Mactrotoma angusta (L.A. Reeve, 1854) - (MACTRIDAE)
- ovalina, Spisula ovalina J.B.P.A. Lamarck, 1818 - syn of: Spisula ovalis (J. de C. Sowerby, 1817) - (MACTRIDAE)
- ovalina, Mactra ovalina E.A. Smith, 1914 - syn of: Mactrotoma antecedens (T. Iredale, 1930) - (MACTRIDAE)
- ovalina, Arcopsis ovalina W.H. Dall, 1898 † - (NOETIIDAE) (FOSSIL)
- ovalina, Nucinella ovalina A.E.M. Cossmann, 1887 † - (NUCINELLIDAE) (FOSSIL)
- ovalina, Physastra ovalina (E.C. Von Martens, 1897) - (PLANORBIDAE)
- ovalina, Volvulella ovalina A. Adams, 1862 - syn of: Volvulella ovulina (A. Adams, 1850) - (RHIZORIDAE)
- ovalina, Chionella ovalina (G.P. Deshayes, 1857 †) - (VENERIDAE) (FOSSIL)
- ovalior, Lymnaea ovalior T.N. Annandale & B. Prashad, 1921 - (LYMNAEIDAE)
- ovalis, Acteon ovalis E.M. Da Costa, 1778 - syn of: Acteon tornatilis (C. Linnaeus, 1758) - (ACTEONIDAE)
- ovalis, Acteonina ovalis (Moore) † - (ACTEONINIDAE) (FOSSIL)
- ovalis, Leucotina ovalis F.W. Hutton, 1885 † - (AMATHINIDAE) (FOSSIL)
- ovalis, Lunarca ovalis (Bruguiere, 1789) - (ARCIDAE)
- ovalis, Arca ovalis J.G. Bruguière, 1789 - syn of: Lunarca ovalis (Bruguiere, 1789) - (ARCIDAE)
- ovalis, Paranorites ovalis Chao, 1959 † - syn of: Submeekoceras hsuyuchieni (Chao, 1959 †) - (ARCTOCERATIDAE) (FOSSIL)
- ovalis, Astarte ovalis S. Woodward, 1833 - syn of: Astarte sulcata (E.M. Da Costa, 1778) - (ASTARTIDAE)
- ovalis, Koninckites ovalis (L. Waagen, 1895 †) - (BEYRICHITIDAE) (FOSSIL)
- ovalis, Kiparisovites ovalis Shevyrev, 1968 † - (BYRRANGOCERATIDAE) (FOSSIL)
- ovalis, Zeadmete ovalis R.K. Dell, 1956 - (CANCELLARIIDAE)
- ovalis, Bonellitia ovalis (P. Marshall, 1918 †) - (CANCELLARIIDAE) (FOSSIL)
- ovalis, Clinocardium ovalis K.B. Barinov, 1982 - syn of: Clinocardium nuttallii (T.A. Conrad, 1837) - (CARDIIDAE)
- ovalis, Cardites ovalis (L.A. Reeve, 1843) - (CARDITIDAE)
- ovalis, Galeodea ovalis G.S. Coen, 1920 - syn of: Galeodea echinophora (C. Linnaeus, 1758) - (CASSIDAE)
- ovalis, Diacavolinia ovalis S. Van Der Spoel, P. Bleeker & H. Kobayasi, 1993 - (CAVOLINIIDAE)
- ovalis, Celtites ovalis L. Waagen, 1895 † - (CELTITIDAE) (FOSSIL)
- ovalis, Actaeonellina ovalis Peel † - (CEPHALASPIDA (unassigned)) (FOSSIL)
- ovalis, Chilina ovalis G.B. I Sowerby, 1841 - (CHILINIDAE)
- ovalis, Fauxulus ovalis (H.C. Küster, 1841) - syn of: Fauxulus ovularis (H.C. Küster, 1841) - (CHONDRINIDAE)
- ovalis, Erycinella ovalis T.A. Conrad, 1845 † - (CONDYLOCARDIIDAE) (FOSSIL)
- ovalis, Corbicula ovalis O.W.H. Reinhardt, 1877 - syn of: Corbicula japonica T. Prime, 1864 - (CYRENIDAE)
- ovalis, Cyrtodonta ovalis Foerste, 1924 † - (CYRTODONTIDAE) (FOSSIL)
- ovalis, Notomya ovalis F. McCoy, 1847 † - syn of: Pyramus myiformis J.B.M. Dana, 1847 † - (EDMONDIIDAE) (FOSSIL)
- ovalis, Pedipes ovalis C.B. Adams, 1849 - (ELLOBIIDAE)
- ovalis, Oceanida ovalis L. de Folin, 1884 - (EULIMIDAE)
- ovalis, Diodora ovalis K.H.J. Thiele, 1930 - syn of: Diodora singaporensis L.A. Reeve, 1850 - (FISSURELLIDAE)
- ovalis, Dischides ovalis (M. Boissevain, 1906) - (GADILIDAE)
- ovalis, Scintilla ovalis C.F. Lützen & C. Nielsen, 2005 - (GALEOMMATIDAE)
- ovalis, Haminoea ovalis W.H. Pease, 1868 - (HAMINOEIDAE)
- ovalis, Girtypecten ovalis Dickins, 1963 † - (HETEROPECTINIDAE) (FOSSIL)
- ovalis, Hipponix ovalis Abbass, 1967 † - (HIPPONICIDAE) (FOSSIL)
- ovalis, Hippopodium ovalis Moore † - (HIPPOPODIUMIDAE) (FOSSIL)
- ovalis, Holopea ovalis Billings, 1859 † - (HOLOPEIDAE) (FOSSIL)
- ovalis, Sonneratia kitchini ovalis T.L. Casey † - (HOPLITIDAE) (FOSSIL)
- ovalis, Hunanopecten ovalis Wang, 1993 † - (HUNANOPECTINIDAE) (FOSSIL)
- ovalis, Plagigeyeria mostarensis ovalis L. Kušcer, 1933 - (HYDROBIIDAE)
- ovalis, Hitia ovalis W.H. Dall, P. Bartsch & H.A. Rehder, 1938 - (LASAEIDAE)
- ovalis, Lepetodrilus ovalis J.H. McLean, 1988 - (LEPETODRILIDAE)
- ovalis, Limatula ovalis (K.H.J. Thiele, 1912) - (LIMIDAE)
- ovalis, Limopsis ovalis W.M. Gabb, 1873 † - (LIMOPSIDAE) (FOSSIL)
- ovalis, Littorina ovalis Moore † - (LITTORINIDAE) (FOSSIL)
- ovalis, Tehamatea ovalis (Stanton, 1895 †) - (LUCINIDAE) (FOSSIL)
- ovalis, Fimbria ovalis Phillips, 1829 † - (LUCINIDAE) (FOSSIL)
- ovalis, Lutetia ovalis A. von Koenen, 1893 † - (LUTETIIDAE) (FOSSIL)
- ovalis, Radix luteola ovalis Ramakrishna & A. Dey, 2007 - (LYMNAEIDAE)
- ovalis, Maclurites ovalis (Vostokova, 1964 †) - (MACLURITIDAE) (FOSSIL)
- ovalis, Paramaclurites ovalis Vostokova, 1964 † - syn of: Maclurites ovalis (Vostokova, 1964 †) - (MACLURITIDAE) (FOSSIL)
- ovalis, Maclurina manitobensis ovalis Wilson, 1931 † - (MACLURITIDAE) (FOSSIL)
- ovalis, Spisula ovalis (J. de C. Sowerby, 1817) - (MACTRIDAE)
- ovalis, Mactra ovalis Sowerby, 1817 - (MACTRIDAE)
- ovalis, Anatina ovalis T. Brown, 1827 - syn of: Thracia villosiuscula (W. Macgillivray, 1827) - (MACTRIDAE)
- ovalis, Mactra ovalis A.A. Gould, 1840 - syn of: Mactromeris polynyma (W. Stimpson, 1860) - (MACTRIDAE)
- ovalis, Anatina ovalis S. Stutchbury, 1830 - syn of: Thracia stutchburyi M. Huber, 2010 - (MACTRIDAE)
- ovalis, Nuculites ovalis McCoy † - (MALLETIIDAE) (FOSSIL)
- ovalis, Oenopota ovalis (H.B.S. Friele, 1877) - (MANGELIIDAE)
- ovalis, Marginella ovalis F.P. Marrat, 1881 - syn of: Cryptospira tricincta (R.B. Hinds, 1844) - (MARGINELLIDAE)
- ovalis, Megadesmus ovalis Sowerby, 1847 † - (MEGADESMIDAE) (FOSSIL)
- ovalis, Prosphingites ovalis Kiparisova, 1961 † - (MELAGATHICERATIDAE) (FOSSIL)
- ovalis, Paphies ovalis L.A. Reeve, 1854 - syn of: Paphies australis (J.F. Gmelin, 1791) - (MESODESMATIDAE)
- ovalis, Mesodesma ovalis L.A. Reeve, 1854 - syn of: Paphies australis (J.F. Gmelin, 1791) - (MESODESMATIDAE)
- ovalis, Monotis ovalis J.J.F. Whiteaves, 1889 † - syn of: Chuluaria occidentalis (J.J.F. Whiteaves, 1889 †) - (MONOTIDAE) (FOSSIL)
- ovalis, Mysella ovalis (K.H.J. Thiele, 1912) - (MONTACUTIDAE)
- ovalis, Tellimya ovalis G.O. Sars, 1878 - syn of: Tellimya tenella (S.L. Lovén, 1846) - (MONTACUTIDAE)
- ovalis, Purpura ovalis H.M.D. de Blainville, 1832 - syn of: Nucella squamosa (J.B.P.A. Lamarck, 1816) - (MURICIDAE)
- ovalis, Mya ovalis L.W. Dillwyn, 1817 - syn of: Unio crassus L. Philipsson in A. Retzius, 1788 - (MYIDAE)
- ovalis, Cryptomya ovalis T.A. Conrad, 1857 - syn of: Cryptomya californica (T.A. Conrad, 1837) - (MYIDAE)
- ovalis, Mya ovalis W. Turton, 1822 - syn of: Mya truncata C. Linnaeus, 1758 - (MYIDAE)
- ovalis, Brachidontes ovalis J.B.P.A. Lamarck, 1819 - syn of: Perumytilus purpuratus (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- ovalis, Modiolus ovalis G.B. Sowerby, 1859 - syn of: Gibbomodiola adriatica (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- ovalis, Neolepton ovalis J.T. Kuroda, 1959 - (NEOLEPTONIDAE)
- ovalis, Micropolia ovalis C.F. Laseron, 1953 - (NEOLEPTONIDAE)
- ovalis, Arginella ovalis F.S. MacNeil, 1938 † - (NOETIIDAE) (FOSSIL)
- ovalis, Nucinella ovalis (S.V. Wood, 1840 †) - (NUCINELLIDAE) (FOSSIL)
- ovalis, Suria ovalis P. Sánchez, 1997 † - (NUCULIDA (unassigned)) (FOSSIL)
- ovalis, Ancilla ovalis (G.B. II Sowerby, 1859) - (OLIVIDAE)
- ovalis, Amalda ovalis A.G. Beu, 1970 † - (OLIVIDAE) (FOSSIL)
- ovalis, Meleagrinella ovalis (B. Phillips, 1829 †) - (OXYTOMIDAE) (FOSSIL)
- ovalis, Palaeomutela ovalis Amalitsky, 1892 † - (PALAEOMUTELIDAE) (FOSSIL)
- ovalis, Partula ovalis W.H. Pease - (PARTULIDAE)
- ovalis, Martesia ovalis (T. Say, 1820 †) - (PHOLADIDAE) (FOSSIL)
- ovalis, Pholadomya ovalis (Sowerby, 1819 †) - (PHOLADOMYIDAE) (FOSSIL)
- ovalis, Placuna ovalis H.M.D. de Blainville, 1826 - syn of: Placuna placenta (C. Linnaeus, 1758) - (PLACUNIDAE)
- ovalis, Concavodonta ovalis P. Sánchez, 1999 † - (PRAENUCULIDAE) (FOSSIL)
- ovalis, Hemiprionites ovalis Burij & Zharnikova, 1972 † - syn of: Arctoprionites ovalis (Burij & Zharnikova, 1972 †) - (PRIONITIDAE) (FOSSIL)
- ovalis, Prionolobus ovalis (L. Waagen, 1895 †) - (PROPTYCHITIDAE) (FOSSIL)
- ovalis, Hiatula ovalis V. Bertin, 1880 - (PSAMMOBIIDAE)
- ovalis, Sanguinolaria ovalis L.A. Reeve, 1857 - (PSAMMOBIIDAE)
- ovalis, Pseudomonotis ovalis J.J.F. Whiteaves, 1889 † - syn of: Chuluaria occidentalis (J.J.F. Whiteaves, 1889 †) - (PSEUDOMONOTIDAE) (FOSSIL)
- ovalis, Evalea ovalis (A. Adams, 1861) - (PYRAMIDELLIDAE)
- ovalis, Chrysallida ovalis K.H.J. Thiele, 1930 - (PYRAMIDELLIDAE)
- ovalis, Turbonilla ovalis L. de Folin, 1868 - (PYRAMIDELLIDAE)
- ovalis, Rissoina ovalis (C.K. Chang & W.L. Wu, 2004) - (RISSOINIDAE)
- ovalis, Rissolina ovalis C.K. Chang & W.L. Wu, 2004 - syn of: Rissoina ovalis (C.K. Chang & W.L. Wu, 2004) - (RISSOINIDAE)
- ovalis, Koreoleptoxis ovalis (J.B. Burch & P.O. Jung, 1987) - (SEMISULCOSPIRIDAE)
- ovalis, Arctoprionites ovalis (Burij & Zharnikova, 1972 †) - (SIBIRITIDAE) (FOSSIL)
- ovalis, Strobeus ovalis E.K. Yoo, 1994 † - (SOLENISCIDAE) (FOSSIL)
- ovalis, Cylindritopsis ovalis C. Gemmellaro, 1889 † - (SOLENISCIDAE) (FOSSIL)
- ovalis, Cyclas ovalis T. Prime, 1853 - syn of: Sphaerium occidentale (J. Lewis, 1856) - (SPHAERIIDAE)
- ovalis, Cyclas ovalis S. Nilsson, 1832 - syn of: Pisidium obtusale (J.B.P.A. Lamarck, 1818) - (SPHAERIIDAE)
- ovalis, Stenothyra ovalis R.A.M. Brandt, 1970 - (STENOTHYRIDAE)
- ovalis, Fusispira ovalis E.F.R.K. Koken, 1897 † - (SUBULITIDAE) (FOSSIL)
- ovalis, Novisuccinea ovalis (T. Say, 1817) - (SUCCINEIDAE)
- ovalis, Tellina ovalis (G.B. I Sowerby, 1825) - (TELLINIDAE)
- ovalis, Tellinides ovalis Sowerby, 1825 - (TELLINIDAE)
- ovalis, Tellina ovalis E. Réquien, 1848 - syn of: Tellina planata C. Linnaeus, 1758 - (TELLINIDAE)
- ovalis, Thracia ovalis (S. Stutchbury, 1830) - (THRACIIDAE)
- ovalis, Unionites ovalis C.T. Trechmann, 1917 † - (TRIGONODIDAE) (FOSSIL)
- ovalis, Turbo ovalis E.M. Da Costa, 1778 - syn of: Acteon tornatilis (C. Linnaeus, 1758) - (TURBINIDAE)
- ovalis, Umbraculum ovalis P.P. Carpenter, 1856 - syn of: Umbraculum umbraculum (J. Lightfoot, 1786) - (UMBRACULIDAE)
- ovalis, Pseudodon ovalis L.J. Morlet, 1889 - syn of: Pseudodon ellipticus T.A. Conrad, 1865 - (UNIONIDAE)
- ovalis, Anodonta ovalis V.L.V. Potiez & A. Michaud, 1844 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- ovalis, Unio ovalis G. Montagu, 1803 - syn of: Unio tumidus A. Retzius, 1788 - (UNIONIDAE)
- ovalis, Meroe ovalis G.B. III Sowerby, 1892 - syn of: Sunetta bruggeni E. Fischer-Piette, 1974 - (VENERIDAE)
- ovalis, Sunetta ovalis G.B. III Sowerby, 1892 - syn of: Sunetta bruggeni E. Fischer-Piette, 1974 - (VENERIDAE)
- ovalis, Nutricola ovalis W.H. Dall, 1902 - syn of: Nutricola tantilla (A.A. Gould, 1853) - (VENERIDAE)
- ovalis, Dosinia ovalis A. Römer, 1860 - syn of: Dosinia pubescens (R.A. Philippi, 1847) - (VENERIDAE)
- ovalis, Pliocardia ovalis (W.H. Dall, 1896) - (VESICOMYIDAE)
- ovalis, Wareniconcha ovalis W.H. Dall, 1896 - syn of: Pliocardia ovalis (W.H. Dall, 1896) - (VESICOMYIDAE)
- ovalis chittenangoensis, Novisuccinea ovalis chittenangoensis H.A. Pilsbry, 1908 - syn of: Novisuccinea chittenangoensis (H.A. Pilsbry, 1908) - (SUCCINEIDAE)
- Ovalitheca, Genus Ovalitheca Sysoev, 1968 † (TCHURANITHECIDAE) (FOSSIL)
- ovallella, Neridomus ovallella Pan, 1977 † - (NERIDOMIDAE) (FOSSIL)
- Ovamactra, Genus Ovamactra Woodring, 1982 † (MACTRIDAE) (FOSSIL)
- ovampicum, Pisidium ovampicum C.M.F. Ancey, 1890 - (SPHAERIIDAE)
- ovandoi, Polymita brocheri ovandoi C. de la Torre, 1950 - (HELMINTHOGLYPTIDAE)
- Ovassiminea, Subgenus Assiminea (Ovassiminea) K.H.J. Thiele, 1927 (ASSIMINEIDAE)
- ovata, Tornatellina ovata L. Pfeiffer, 1848 - syn of: Elasmias ovatum (H.E. Anton, 1839) - (ACHATINELLIDAE)
- ovata, Achatinella bulimoides ovata W. Newcomb, 1854 - (ACHATINELLIDAE)
- ovata, Achatina ovata L. Pfeiffer, 1841 - syn of: Elasmias ovatum (H.E. Anton, 1839) - (ACHATINIDAE)
- ovata, Acteonina ovata Behrendsen, 1891 † - (ACTEONINIDAE) (FOSSIL)
- ovata, Leptachatina ovata C.M. Cooke, 1910 - (AMASTRIDAE)
- ovata, Pila ovata G.A. Olivier, 1804 - syn of: Lanistes ovatus (G.A. Olivier, 1804) - (AMPULLARIIDAE)
- ovata, Barrandicella ovata (J. Perner, 1903 †) - (ARCHINACELLIDAE) (FOSSIL)
- ovata, Barbatia ovata J.F. Gmelin, 1791 - syn of: Barbatia foliata (P. Forsskål in C. Niebuhr, 1775) - (ARCIDAE)
- ovata, Arca ovata L.A. Reeve, 1844 - syn of: Anadara aequatorialis (A.V.M.D. D'Orbigny, 1846) - (ARCIDAE)
- ovata, Cryptaustenia ovata W.T. Blanford - (ARIOPHANTIDAE)
- ovata, Assiminea ovata (C.F.F. von Krauss, 1848) - (ASSIMINEIDAE)
- ovata, Astarte ovata T. Brown, 1827 - syn of: Astarte elliptica (J. Brown, 1827) - (ASTARTIDAE)
- ovata, Aulacomyella ovata Romanov, 1976 † - (AULACOMYELLIDAE) (FOSSIL)
- ovata, Gervillella ovata (J. de C. Sowerby.) † - (BAKEVELLIIDAE) (FOSSIL)
- ovata, Engina ovata W.H. Pease, 1865 - (BUCCINIDAE)
- ovata, Cancellaria ovata Sowerby, 1832 - (CANCELLARIIDAE)
- ovata, Admete ovata E.A. Smith, 1875 - (CANCELLARIIDAE)
- ovata, Trichotropis ovata E.A. Smith, 1895 - (CAPULIDAE)
- ovata, Cyclocardia ovata (Riabinina, 1952) - (CARDITIDAE)
- ovata, Cardita ovata C.B. Adams, 1845 - syn of: Chioneryx pygmaea (J.B.P.A. Lamarck, 1818) - (CARDITIDAE)
- ovata, Oospira ovata (W.T. Blanford, 1872) - (CLAUSILIIDAE)
- ovata, Clivunella ovata Gorjanovic-Kramberger, 1923 † - (CLAVATULIDAE) (FOSSIL)
- ovata, Cocculina ovata M.M. Schepman, 1908 - (COCCULINIDAE)
- ovata, Sioliella ovata Wesselingh, 2000 † - (COCHLIOPIDAE) (FOSSIL)
- ovata, Tryonia ovata R. Hershler, H.P. Liu & J.J. Landye, 2011 - syn of: Lithoglyphopsis ovata (R. Hershler, H.P. Liu & J.J. Landye, 2011) - (COCHLIOPIDAE)
- ovata, Condylocuna ovata (C. Hedley, 1906) - syn of: Mysella ovata C. Hedley, 1906 - (CONDYLOCARDIIDAE)
- ovata, Corbula ovata E. Forbes, 1838 - syn of: Corbula gibba (A.G. Olivi, 1792) - (CORBULIDAE)
- ovata, Perrierina ovata J. Marwick, 1928 † - (CYAMIIDAE) (FOSSIL)
- ovata, Cylichna ovata J.G. Jeffreys, 1870 - syn of: Pyrunculus ovatus (J.G. Jeffreys, 1871) - (CYLICHNIDAE)
- ovata, Cymaclymenia ovata Schindewolf, 1923 † - (CYMACLYMENIIDAE) (FOSSIL)
- ovata, Corolla ovata (J.R.C. Quoy & J.P. Gaimard, 1833) - (CYMBULIIDAE)
- ovata, Cymbulia ovata J.R.C. Quoy & J.P. Gaimard, 1833 - syn of: Corolla ovata (J.R.C. Quoy & J.P. Gaimard, 1833) - (CYMBULIIDAE)
- ovata, Cypraea ovata D. Martin, 1879 † - (CYPRAEIDAE) (FOSSIL)
- ovata, Erronea ovata J.E. Gray, 1824 - syn of: Erronea ovum (J.F. Gmelin, 1791) - (CYPRAEIDAE)
- ovata, Erosaria ovata G. Perry, 1811 - syn of: Erosaria turdus (J.B.P.A. Lamarck, 1810) - (CYPRAEIDAE)
- ovata, Corbicula ovata S. Clessin, 1879 - syn of: Corbicula fluminea (O.F. Müller, 1774) - (CYRENIDAE)
- ovata, Heikea ovata Isberg, 1934 † - (CYRTODONTIDAE) (FOSSIL)
- ovata, Gibberula ovata T. Habe, 1951 - (CYSTISCIDAE)
- ovata, Edmondia ovata F.B. Meek & A.H. Worthen, 1873 † - (EDMONDIIDAE) (FOSSIL)
- ovata, Pythiopsis ovata (J.B.P.A. Lamarck, 1804 †) - (ELLOBIIDAE) (FOSSIL)
- ovata, Auricula ovata J.E. Gray, 1830 - syn of: Ophicardelus ornatus (A.E.J. Férussac, 1821) - (ELLOBIIDAE)
- ovata, Erodona ovata E. Forbes, 1838 - (ERODONIDAE)
- ovata, Echineulima ovata (W.H. Pease, 1861) - (EULIMIDAE)
- ovata, Apicalia ovata (W.H. Pease, 1860) - (EULIMIDAE)
- ovata, Mucronalia ovata W.H. Pease, 1861 - syn of: Echineulima ovata (W.H. Pease, 1861) - (EULIMIDAE)
- ovata, Rhabdotocochlis ovata Wang, 1980 † - (EUOMPHALIDAE) (FOSSIL)
- ovata, Pleuroploca ovata K.T. Menke, 1829 - syn of: Granolaria salmo (W. Wood, 1828) - (FASCIOLARIIDAE)
- ovata, Gastrochaena ovata G.B. I Sowerby, 1834 - (GASTROCHAENIDAE)
- ovata, Glycymeris ovata W.J. Broderip, 1832 - (GLYCYMERIDIDAE)
- ovata, Goniodoris ovata K.H. Barnard, 1934 - (GONIODORIDIDAE)
- ovata, Prososthenia ovata (H.G. Bronn, 1831 †) - (HYDROBIIDAE) (FOSSIL)
- ovata, Velesunio ovata (F. Haas, 1910) - (HYRIIDAE)
- ovata, Scacchia ovata R.A. Philippi, 1844 - (LASAEIDAE)
- ovata, Erycina ovata R.A. Philippi, 1836 - syn of: Abra segmentum (C.A. Récluz, 1843) - (LASAEIDAE)
- ovata, Limatula ovata Wood, 1839 † - (LIMIDAE) (FOSSIL)
- ovata, Lima ovata J.G. Jeffreys, 1876 - syn of: Limatula confusa (E.A. Smith, 1885) - (LIMIDAE)
- ovata, Limatula ovata W.H. Dall, 1881 - syn of: Limatula setifera W.H. Dall, 1886 - (LIMIDAE)
- ovata, Lithoglyphopsis ovata (R. Hershler, H.P. Liu & J.J. Landye, 2011) - (LITHOGLYPHIDAE)
- ovata, Radix ovata J.P.R. Draparnaud, 1805 - syn of: Radix balthica (C. Linnaeus, 1758) - (LYMNAEIDAE)
- ovata, Cyclomactra ovata (J.E. Gray, 1843) - (MACTRIDAE)
- ovata, Mactra ovata W. Wood, 1828 - syn of: Paphies australis (J.F. Gmelin, 1791) - (MACTRIDAE)
- ovata, Spisula ovata J.E. Gray, 1843 - syn of: Cyclomactra ovata (J.E. Gray, 1843) - (MACTRIDAE)
- ovata, Serrata ovata F. Boyer, 2008 - (MARGINELLIDAE)
- ovata, Granulina ovata T. McCleery, 2010 - (MARGINELLIDAE)
- ovata, Marginella ovata K.H.J. Thiele, 1925 - syn of: Alaginella pemphix (B. Roth, 1973) - (MARGINELLIDAE)
- ovata, Paphies ovata J.E. Gray, 1843 - syn of: Paphies australis (J.F. Gmelin, 1791) - (MESODESMATIDAE)
- ovata, Mnestia ovata Garvie, 2013 † - (MNESTIIDAE) (FOSSIL)
- ovata, Modiolopsis ovata (T.A. Conrad, 1842 †) - (MODIOMORPHIDAE) (FOSSIL)
- ovata, Modiomorpha ovata F.B. Meek, 1877 † - (MODIOMORPHIDAE) (FOSSIL)
- ovata, Mysella ovata C. Hedley, 1906 - (MONTACUTIDAE)
- ovata, Kurtiella ovata (J.G. Jeffreys, 1881) - (MONTACUTIDAE)
- ovata, Montacuta ovata H.B.S. Friele, 1876 - syn of: Tellimya tenella (S.L. Lovén, 1846) - (MONTACUTIDAE)
- ovata, Myadora ovata L.A. Reeve, 1844 - (MYOCHAMIDAE)
- ovata, Brachidontes ovata S. Clessin, 1889 - syn of: Perumytilus purpuratus (J.B.P.A. Lamarck, 1819) - (MYTILIDAE)
- ovata, Bulliopsis ovata T.A. Conrad, 1862 † - (NASSARIIDAE) (FOSSIL)
- ovata, Natica ovata Klipstein, 1843 † - (NATICIDAE) (FOSSIL)
- ovata, Euspira pila ovata (G.B. III Sowerby, 1914) - (NATICIDAE)
- ovata, Nucinella ovata J.G. Jeffreys, 1879 - syn of: Huxleyia sulcata A. Adams, 1860 - (NUCINELLIDAE)
- ovata, Polidevcia ovata (C.F. Laseron, 1910 †) - (NUCULANIDAE) (FOSSIL)
- ovata, Pojetaia ovata C. Chen & Wang, 1985 † - (NUCULIDA (unassigned)) (FOSSIL)
- ovata, Jellia ovata Li & W.C. Zhou, 1986 † - syn of: Pojetaia runnegari Jell, 1980 † - (NUCULIDA (unassigned)) (FOSSIL)
- ovata, Nucula ovata A.E. Verrill & K.J. Bush, 1898 - syn of: Nucula proxima T. Say, 1820 - (NUCULIDAE)
- ovata, Oliva ovata F.P. Marrat, 1871 - syn of: Olivancillaria deshayesiana Ducros, 1857 - (OLIVIDAE)
- ovata, Otina ovata (T. Brown, 1827) - (OTINIDAE)
- ovata, Palaeomutela ovata (Sharpe †) - (PALAEOMUTELIDAE) (FOSSIL)
- ovata, Periploma ovata J.T. Kuroda & M. Horikoshi, 1958 - syn of: Pendaloma otohimeae (T. Habe, 1952) - (PERIPLOMATIDAE)
- ovata, Cratis ovata J. Marwick, 1931 † - (PHILOBRYIDAE) (FOSSIL)
- ovata, Pholas ovata J.E. Gray in G.B. II Sowerby, 1849 - syn of: Aspidopholas ovum (W. Wood, 1828) - (PHOLADIDAE)
- ovata, Tricula ovata N.T. Dang & T.H. Ho, 2006 - (POMATIOPSIDAE)
- ovata, Vulsella ovata J.B.P.A. Lamarck, 1819 - (PTERIIDAE)
- ovata, Meleagrina ovata J.R.C. Quoy & J.P. Gaimard, 1835 - syn of: Electroma alacorvi (L.W. Dillwyn, 1817) - (PTERIIDAE)
- ovata, Odostomia ovata P.P. Carpenter, 1857 - (PYRAMIDELLIDAE)
- ovata, Odostomia ovata (K.H.J. Thiele, 1912) - (PYRAMIDELLIDAE)
- ovata, Tiberia ovata E. Saurin, 1959 - (PYRAMIDELLIDAE)
- ovata, Onoba ovata (K.H.J. Thiele, 1912) - (RISSOIDAE)
- ovata, Xianfengella ovata He & Yang, 1982 † - syn of: Absidaticonus ovatus He & Yang, 1982 † - (RUGAECONIDAE) (FOSSIL)
- ovata, Sabatia ovata T. Habe, 1952 - syn of: Alacuppa supracancellata (M.M. Schepman, 1913) - (SCAPHANDRIDAE)
- ovata, Kaibabella ovata C.O. Waterhouse, 1983 † - (SCHIZODIDAE) (FOSSIL)
- ovata, Abra ovata R.A. Philippi, 1836 - syn of: Abra segmentum (C.A. Récluz, 1843) - (SEMELIDAE)
- ovata, Silicula ovata (T.A. de M. Monterosato, 1875) - (SILICULIDAE)
- ovata, Simpulopsis ovata (G.B. I Sowerby, 1821) - (SIMPULOPSIDAE)
- ovata, Eupera ovata (G. Mandahl-Barth, 1954) - (SPHAERIIDAE)
- ovata, Cyclocalyx ovata L.A. Prozorova, 1988 - syn of: Pisidium obtusale (J.B.P.A. Lamarck, 1818) - (SPHAERIIDAE)
- ovata, Curvella ovata (S. Putzeys, 1899) - (SUBULINIDAE)
- ovata, Opacuincola ovata M. Haase, 2008 - (TATEIDAE)
- ovata, Arcopagia ovata J. Brown, 1827 - syn of: Arcopagia crassa (T. Pennant, 1777) - (TELLINIDAE)
- ovata, Tellina ovata P.F. Röding, 1798 - syn of: Tellina inflata J.F. Gmelin, 1791 - (TELLINIDAE)
- ovata, Thracia ovata T. Brown, 1844 - syn of: Thracia villosiuscula (W. Macgillivray, 1827) - (THRACIIDAE)
- ovata, Mendicula ovata (A.E. Verrill & K.J. Bush, 1898) - (THYASIRIDAE)
- ovata, Pterodonta ovata A.V.M.D. D'Orbigny, 1843 † - (TYLOSTOMATIDAE) (FOSSIL)
- ovata, Acuticosta ovata (C.T. Simpson, 1900) - (UNIONIDAE)
- ovata, Lampsilis ovata (T. Say, 1817) - (UNIONIDAE)
- ovata, Pseudobaphia ovata Y.Y. Liu, Y.H. Duan & Y.X. Wang, 1994 - syn of: Lamellidens liuovatus (Z. Zhuang & J. He, 2013) - (UNIONIDAE)
- ovata, Anodon ovata W.J. Swainson, 1841 - syn of: Anodontites trigona (J.B. von Spix & J.A. Wagner, 1827) - (UNIONIDAE)
- ovata, Ellipsanodon ovata V.V. Bogatov & Y.I. Starobogatov, 1996 - syn of: Sinanodonta woodiana (I. Lea, 1834) - (UNIONIDAE)
- ovata, Unio ovata E. Donovan, 1802 - syn of: Unio tumidus A. Retzius, 1788 - (UNIONIDAE)
- ovata, Anodonta ovata H.C. Küster - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- ovata, Urocoptis ovata (G.P. Deshayes) - (UROCOPTIDAE)
- ovata, Myonia ovata C.O. Waterhouse, 1969 † - (VACUNELLIDAE) (FOSSIL)
- ovata, Zeradina ovata (N.H. Odhner, 1924) - (VANIKORIDAE)
- ovata, Pleiorytis ovata T.A. Conrad, 1862 † - (VENERIDAE) (FOSSIL)
- ovata, Marama ovata J. Marwick, 1927 † - (VENERIDAE) (FOSSIL)
- ovata, Timoclea ovata (T. Pennant, 1777) - (VENERIDAE)
- ovata, Petricola ovata F.H. Troschel, 1852 - syn of: Petricola rugosa Sowerby, 1834 - (VENERIDAE)
- ovata, Meretrix ovata B. Rogers & B. Rogers, 1837 † - syn of: Pitar ovatus (B. Rogers & B. Rogers, 1837 †) - (VENERIDAE) (FOSSIL)
- ovata, Periglypta ovata B. Rogers & B. Rogers, 1837 † - syn of: Pitar ovatus (B. Rogers & B. Rogers, 1837 †) - (VENERIDAE) (FOSSIL)
- ovata, Policordia ovata I.N.V. Ivanova, 1977 - (VERTICORDIIDAE)
- ovata, Vertigo ovata T. Say, 1822 - (VERTIGINIDAE)
- ovata, Yoldiella ovata J.A. Allen, A. Sanders & G. Hannah, 1995 - (YOLDIIDAE)
- ovata aberrans, Lymnaea ovata aberrans C.A. Westerlund, 1897 - syn of: Lymnaea aberrans (C.A. Westerlund, 1897) - (LYMNAEIDAE)
- ovata atkaensis, Lymnaea ovata atkaensis W.H. Dall, 1884 - syn of: Ladislavella atkaensis (W.H. Dall, 1884) - (LYMNAEIDAE)
- ovata elevata, Archinacella ovata elevata J. Perner, 1903 † - syn of: Barrandicellopsis elevata (J. Perner, 1903 †) - (ARCHINACELLIDAE) (FOSSIL)
- ovata letourneuxi, Pila ovata letourneuxi J.R. Bourguignat, 1879 - syn of: Lanistes letourneuxi (J.R. Bourguignat, 1879) - (AMPULLARIIDAE)
- ovata lutea, Venus ovata lutea J.G. Jeffreys, 1864 - syn of: Timoclea ovata (T. Pennant, 1777) - (VENERIDAE)
- ovata marmorata, Venus ovata marmorata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1893 - syn of: Timoclea ovata (T. Pennant, 1777) - (VENERIDAE)
- ovata paucicostata, Venus ovata paucicostata M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1893 - syn of: Timoclea ovata (T. Pennant, 1777) - (VENERIDAE)
- ovata sanctaeannae, Urocoptis ovata sanctaeannae H.A. Pilsbry, 1902 - syn of: Urocoptis ovata (G.P. Deshayes) - (UROCOPTIDAE)
- ovata stuhlmanni, Pila ovata stuhlmanni E.C. Von Martens, 1897 - syn of: Lanistes stuhlmanni (E.C. Von Martens, 1897) - (AMPULLARIIDAE)
- ovata transversa, Venus ovata transversa M.E.J. Bucquoy, P. Dautzenberg & G.F. Dollfus, 1893 - syn of: Timoclea ovata (T. Pennant, 1777) - (VENERIDAE)
- ovata trigona, Venus ovata trigona J.G. Jeffreys, 1864 - syn of: Timoclea ovata (T. Pennant, 1777) - (VENERIDAE)
- ovata ventricosa, Lampsilis ovata ventricosa D.W. Barnes, 1823 - (UNIONIDAE)
- Ovatella, Genus Ovatella Ant. Bivona-Bernardi, 1832 (ELLOBIIDAE)
- ovatella, Rissoa ovatella E. Forbes, 1843 - syn of: Rissoa similis A. Scacchi, 1836 - (RISSOIDAE)
- Ovaticeras, Genus Ovaticeras Buckman, 1918 † (HILDOCERATIDAE) (FOSSIL)
- ovatiformis, Palaeomutela ovatiformis Gusev † - (PALAEOMUTELIDAE) (FOSSIL)
- Ovatilla, syn of: Genus Ovatella Ant. Bivona-Bernardi, 1832 (ELLOBIIDAE)
- Ovatipsa, Genus Ovatipsa T. Iredale, 1931 (CYPRAEIDAE)
- Ovatoconcha, Genus Ovatoconcha Cope, 1996 † (OVATOCONCHIDAE) (FOSSIL)
- OVATOCONCHIDAE Carter, 2011 † - Family (BIVALVIA-PROTOBRANCHIA-SOLEMYIDA) (FOSSIL)
- ovatolobum, Cheiloceras ovatolobum Babin, 1966 † - (CHEILOCERATIDAE) (FOSSIL)
- Ovatoplax, syn of: Genus Ischnochiton J.E. Gray, 1847 (ISCHNOCHITONIDAE)
- ovatostoma, Parvedentulina ovatostoma K.C. Emberton & T.A. Pearce, 2000 - (STREPTAXIDAE)
- ovatotrigonum, Pisidium ovatotrigonum (L.V. Krivosheina, 1979) - (SPHAERIIDAE)
- ovatotrigonum, Neopisidium ovatotrigonum L.V. Krivosheina, 1979 - syn of: Pisidium ovatotrigonum (L.V. Krivosheina, 1979) - (SPHAERIIDAE)
- ovatotruncata, Leionucula ovatotruncata O.A. Scarlato, 1981 - syn of: Ennucula tenuis (G. Montagu, 1808) - (NUCULIDAE)
- ovatula, Amastra ovatula C.M. Cooke, 1933 - (AMASTRIDAE)
- ovatula, Palaina ovatula O.F. von Möllendorff, 1897 - (DIPLOMMATINIDAE)
- ovatula, Lyropupa ovatula C.M. Cooke & H.A. Pilsbry, 1920 - (VERTIGINIDAE)
- ovatula kona, Lyropupa ovatula kona H.A. Pilsbry & C.M. Cooke, 1920 - (VERTIGINIDAE)
- ovatula moomomiensis, Lyropupa ovatula moomomiensis H.A. Pilsbry & C.M. Cooke, 1926 - (VERTIGINIDAE)
- ovatulum, Elasmias ovatulum (O.F. von Möllendorff, 1900) - (ACHATINELLIDAE)
- ovatulus, Ammonites ovatulus C.T. Simpson, 1855 † - syn of: Eleganticeras elegantulum A.T. Young & Bird, 1828 † - (AMMONITIDA (unassigned)) (FOSSIL)
- ovatum, Elasmias ovatum (H.E. Anton, 1839) - (ACHATINELLIDAE)
- ovatum, Anabathron ovatum (A.W.B. Powell, 1927) - (ANABATHRIDAE)
- ovatum, Anguloceras ovatum Unklesbay & A.T. Young, 1956 † - (BASSLEROCERATIDAE) (FOSSIL)
- ovatum, Staffites ovatum (Münster, 1832 †) - (CHEILOCERATIDAE) (FOSSIL)
- ovatum, Toxosoma ovatum Wesselingh, 2006 † - (COCHLIOPIDAE) (FOSSIL)
- ovatum, Cyathopoma ovatum (R.H. Beddome, 1875) - (CYCLOPHORIDAE)
- ovatum, Ellobium ovatum (J.B.P.A. Lamarck, 1804 †) - (ELLOBIIDAE) (FOSSIL)
- ovatum, Ovaticeras ovatum (A.T. Young & Bird, 1822 †) - (HILDOCERATIDAE) (FOSSIL)
- ovatum, Lepton ovatum R. Tate, 1886 - syn of: Montacuta meridionalis R. Tate, 1887 - (LASAEIDAE)
- ovatum, Loxonema ovatum A. Römer, 1850 † - syn of: Macrochilina ovatum (A. Römer, 1850 †) - (LOXONEMATIDAE) (FOSSIL)
- ovatum, Periploma ovatum D'Orbigny, 1846 - (PERIPLOMATIDAE)
- ovatum, Macrochilina ovatum (A. Römer, 1850 †) - (SOLENISCIDAE) (FOSSIL)
- ovatum, Tryblidium ovatum R.P. Whitfield, 1886 † - (TRYBLIDIIDAE) (FOSSIL)
- ovatum, Tylostoma ovatum Sharpe, 1849 † - (TYLOSTOMATIDAE) (FOSSIL)
- ovatus, Ammonites ovatus A.T. Young & Bird, 1822 † - syn of: Ovaticeras ovatum (A.T. Young & Bird, 1822 †) - (AMMONITIDA (unassigned)) (FOSSIL)
- ovatus, Lanistes ovatus (G.A. Olivier, 1804) - (AMPULLARIIDAE)
- ovatus, Ceratosiphon ovatus (Münster in G.A. Goldfuss, 1844 †) - (APORRHAIDAE) (FOSSIL)
- ovatus, Baculites ovatus T. Say, 1820 † - (BACULITIDAE) (FOSSIL)
- ovatus, Praematuratropis ovatus Rollins & al., 1971 † - (BELLEROPHONTIDAE) (FOSSIL)
- ovatus, Joculator ovatus C.F. Laseron, 1956 - (CERITHIOPSIDAE)
- ovatus, Pachydon ovatus T.A. Conrad, 1871 † - (CORBULIDAE) (FOSSIL)
- ovatus, Plesiocystiscus ovatus M. Lussi & G. Smith, 1998 - (CYSTISCIDAE)
- ovatus, Petunculus ovatus J.R.C. Quoy & J.P. Gaimard, 1835 - syn of: Tucetona laticostata (J.R.C. Quoy, 1835) - (GLYCYMERIDIDAE)
- ovatus, Glycymeris ovatus J.R.C. Quoy & J.P. Gaimard, 1835 - syn of: Tucetona laticostata (J.R.C. Quoy, 1835) - (GLYCYMERIDIDAE)
- ovatus, Goniatites ovatus Münster, 1832 † - syn of: Staffites ovatum (Münster, 1832 †) - (GONIATITIDAE) (FOSSIL)
- ovatus, Erycites ovatus Géczy, 1966 † - (HAMMATOCERATIDAE) (FOSSIL)
- ovatus, Absidaticonus ovatus He & Yang, 1982 † - (HELCIONELLIDAE) (FOSSIL)
- ovatus, Pleiodon ovatus (W.J. Swainson, 1823) - (IRIDINIDAE)
- ovatus, Megalobulimus ovatus (O.F. Müller, 1774) - (MEGALOBULIMIDAE)
- ovatus, Neoschizodus ovatus (G.A. Goldfuss, 1838 †) - (MYOPHORIIDAE) (FOSSIL)
- ovatus, Phaseolus ovatus G. Seguenza, 1877 † - (PHASEOLIDAE) (FOSSIL)
- ovatus, Phaseolus ovatus A.E. Verrill, 1884 - syn of: Yoldiella curta A.E. Verrill & K.J. Bush, 1898 - (PHASEOLIDAE)
- ovatus, Phymorhynchus ovatus A. Warén & P. Bouchet, 2001 - (RAPHITOMIDAE)
- ovatus, Pyrunculus ovatus (J.G. Jeffreys, 1871) - (RETUSIDAE)
- ovatus, Schizodus ovatus F.B. Meek & Hayden, 1858 † - (SCHIZODIDAE) (FOSSIL)
- ovatus, Strophocheilus ovatus O.F. Müller, 1774 - syn of: Megalobulimus ovatus (O.F. Müller, 1774) - (STROPHOCHEILIDAE)
- ovatus, Cardinioides ovatus I. Hayami, 1957 † - (TRIGONODIDAE) (FOSSIL)
- ovatus, Pitar ovatus (B. Rogers & B. Rogers, 1837 †) - (VENERIDAE) (FOSSIL)
- ovatus chianostoma, Megalobulimus ovatus chianostoma O.A.L. Mörch, 1852 - syn of: Megalobulimus chianostoma (O.A.L. Mörch, 1852) - (MEGALOBULIMIDAE)
- ovatus congoensis, Lanistes ovatus congoensis H.A. Pilsbry & C.E. Beecher, 1929 - (AMPULLARIIDAE)
- ovatus kordofana, Lanistes ovatus kordofana (R.A. Philippi) - (AMPULLARIIDAE)
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