• Acalyptophis peronii (Duméril, 1853) accepted as Hydrophis peronii (Duméril, 1853)
• Acrochordus arafurae McDowell, 1979
• Acrochordus granulatus (Schneider, 1799)
• Acrochordus javanicus Hornstedt, 1787
• Aethia cristatella (Pallas, 1769)
• Aethia psittacula (Pallas, 1769)
• Aethia pusilla (Pallas, 1811)
• Aethia pygmaea (Gmelin, 1789)
• Aipysurus apraefrontalis Smith, 1926
• Aipysurus duboisii Bavay, 1869
• Aipysurus eydouxi Gray, 1849
• Aipysurus foliosquama Smith, 1926
• Aipysurus fuscus Tschudi, 1837
• Aipysurus laevis Lacépède, 1804
• Aipysurus laevis pooleorum Smith, 1974
• Aipysurus pooleorum Smith, 1974 accepted as Aipysurus laevis pooleorum Smith, 1974
• Aipysurus tenuis Lönnberg & Andersson, 1913
• Alca torda Linnaeus, 1758
• Alle alle (Linnaeus, 1758)
• Amblyrhynchus cristatus Bell, 1825
• Anous albivittus (Bonaparte, 1856)
• Anous minutus Boie, 1844
• Anous stolidus (Linnaeus, 1758)
• Anous tenuirostris (Temminck, 1823)
• Aphrodroma brevirostris (Lesson, 1831)
• Aptenodytes forsteri Gray, 1844
• Aptenodytes patagonicus Miller, 1778
• Arctocephalus australis (Zimmermann, 1783)
• Arctocephalus australis forsteri (Lesson, 1828)
• Arctocephalus forsteri (Lesson, 1828) accepted as Arctocephalus australis forsteri (Lesson, 1828)
• Arctocephalus galapagoensis Heller, 1904
• Arctocephalus gazella (Peters, 1875)
• Arctocephalus philippii (Peters, 1866)
• Arctocephalus philippii townsendi (Merriam, 1897)
• Arctocephalus pusillus (Schreber, 1775)
• Arctocephalus townsendi Merriam, 1897 accepted as Arctocephalus philippii townsendi (Merriam, 1897)
• Arctocephalus tropicalis (Gray, 1872)
• Ardenna creatopus (Coues, 1864)
• Astrotia stokesii (Gray, 1846) accepted as Hydrophis stokesii (Gray, 1846)
• Balaena mysticetus Linnaeus, 1758
• Balaenoptera acutorostrata Lacépède, 1804
• Balaenoptera bonaerensis Burmeister, 1867
• Balaenoptera borealis Lesson, 1828
• Balaenoptera brydei Olsen, 1913 (uncertain > taxon inquirendum)
• Balaenoptera edeni Anderson, 1878
• Balaenoptera musculus (Linnaeus, 1758)
• Balaenoptera omurai Wada, Oishi & Yamada, 2003
• Balaenoptera physalus (Linnaeus, 1758)
• Berardius arnuxii Duvernoy, 1851
• Berardius bairdii Stejneger, 1883
• Bitia hydroides Gray, 1849
• Brachyramphus brevirostris (Vigors, 1829)
• Brachyramphus marmoratus (Gmelin, 1789)
• Brachyramphus perdix (Pallas, 1811)
• Brachyrampus brevirostris (Vigors, 1829) accepted as Brachyramphus brevirostris (Vigors, 1829)
• Brachyrampus marmoratus (Gmelin, 1789) accepted as Brachyramphus marmoratus (Gmelin, 1789)
• Brachyrampus perdix (Pallas, 1811) accepted as Brachyramphus perdix (Pallas, 1811)
• Bulweria bulwerii (Jardine & Selby, 1828)
• Bulweria fallax Jouanin, 1955
• Bulweria macgillivrayi (G. R. Gray, 1860) accepted as Pseudobulweria macgillivrayi (Gray, 1860)
• Callorhinus ursinus (Linnaeus, 1758)
• Calonectris diomedea (Scopoli, 1769)
• Calonectris leucomelas (Temminck, 1835)
• Cantoria annulata de Jong, 1926 accepted as Djokoiskandarus annulata (de Jong, 1926)
• Cantoria violacea Girard, 1857
• Caperea marginata (Gray, 1846)
• Caretta caretta (Linnaeus, 1758)
• Catharacta antarctica (Lesson, 1831) accepted as Stercorarius antarcticus (Lesson, 1831)
• Catharacta chilensis (Bonaparte, 1857) accepted as Stercorarius chilensis Bonaparte, 1857
• Catharacta maccormicki (Saunders, 1893) accepted as Stercorarius maccormicki Saunders, 1893
• Catharacta skua Brünnich, 1764 accepted as Stercorarius skua (Brünnich, 1764)
• Cephalorhynchus commersonii (Lacépède, 1804)
• Cephalorhynchus eutropia Gray, 1846
• Cephalorhynchus heavisidii (Gray, 1828)
• Cephalorhynchus hectori (P. J. Van Beneden, 1881)
• Cepphus carbo Pallas, 1811
• Cepphus columba Pallas, 1811
• Cepphus grylle (Linnaeus, 1758)
• Cerberus rynchops (Schneider, 1799)
• Cerorhinca monocerata (Pallas, 1811)
• Chelonia agassizii Bocourt, 1868 accepted as Chelonia mydas agassizii (Bocourt, 1868) accepted as Chelonia mydas (Linnaeus, 1758)
• Chelonia mydas (Linnaeus, 1758)
• Chelonia mydas agassizii (Bocourt, 1868) accepted as Chelonia mydas (Linnaeus, 1758)
• Chionis albus Gmelin, 1789
• Chionis minor Hartlaub, 1841
• Chitulia laboutei (Rasmussen & Ineich, 2000)
• Chitulia sibauensis (Rasmussen, Auliya & Böhme, 2001)
• Chlidonias albostriatus (Gray, 1845)
• Chlidonias hybrida (Pallas, 1811)
• Chlidonias leucopterus (Temminck, 1815)
• Chlidonias niger (Linnaeus, 1758)
• Chroicocephalus bulleri (Hutton, 1871)
• Chroicocephalus genei (Breme, 1839)
• Chroicocephalus ridibundus (Linnaeus, 1766) accepted as Larus ridibundus Linnaeus, 1766
• Creagrus furcatus (Néboux, 1842)
• Crocodylus porosus Schneider, 1801
• Cyclorrhynchus psittacula (Pallas, 1769) accepted as Aethia psittacula (Pallas, 1769)
• Cystophora cristata (Erxleben, 1777)
• Daption capense (Linnaeus, 1758)
• Delphinapterus leucas (Pallas, 1776)