• Acanthodelphis (Phocaena) philippii Philippi, 1896 accepted as Phocoena spinipinnis (Burmeister, 1865)
• Acanthodelphis spinipinnis Gray, 1868 accepted as Phocoena spinipinnis (Burmeister, 1865)
• Acinonyx guttatus (uncertain > unassessed)
• Agaphelus gibbosus Cope, 1968 accepted as Balaenoptera acutorostrata Lacépède, 1804
• Agaphelus glaucus Cope, 1868 accepted as Eschrichtius robustus (Lilljeborg, 1861)
• Aliama desmarestii Gray, 1864 accepted as Ziphius cavirostris Cuvier, 1823
• Aliama indica Gray, 1865 accepted as Ziphius cavirostris Cuvier, 1823
• Alopex lagopus (Linnaeus, 1758) accepted as Vulpes lagopus (Linnaeus, 1758)
• Alopex lagopus beringensis (Merriam, 1902) accepted as Vulpes lagopus beringensis Merriam, 1902
• Amblonyx cinereus (Illiger, 1815)
• Amphiptera pacifica Giglioli, 1870 (uncertain > nomen dubium)
• Anarnak groenlandicus Lacépède, 1804 (uncertain > nomen dubium)
• Anisosiren pannonica Kordos, 1979 †
• Anomotherium langewieschei Siegfried, 1965 †
• Antilope subgutturosa Güldenstädt, 1780 accepted as Gazella subgutturosa (Güldenstädt, 1780)
• Aodon dalei Lesson, 1828 accepted as Mesoplodon bidens (Sowerby, 1804)
• Aonyx capensis (Schinz, 1821)
• Aonyx cinerea (Illiger, 1815)
• Apodemus agrarius (Pallas, 1771)
• Apodemus flavicollis (Melchior, 1834)
• 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 pusillus doriferus Wood Jones, 1925
• Arctocephalus pusillus pusillus (Schreber, 1776)
• Arctocephalus townsendi Merriam, 1897 accepted as Arctocephalus philippii townsendi (Merriam, 1897)
• Arctocephalus tropicalis (Gray, 1872)
• Arvicanthis niloticus (Desmarest, 1822) accepted as Arvicanthis niloticus (Geoffrey, 1803)
• Arvicanthis niloticus (Geoffrey, 1803)
• Arvicola terrestris (Linnaeus, 1758)
• Ashokia antiqua Bajpai, Domning, Das & Mishra, 2009 †
• Australophocaena dioptrica (Lahille, 1912) accepted as Phocoena dioptrica Lahille, 1912
• Australophocaena dioptrica Barnes, 1985 accepted as Phocoena dioptrica Lahille, 1912
• Awamokoa tokarahi Tanaka & Fordyce, 2017 †
• Balaena agamachschik Cope, 1868 (uncertain > nomen dubium)
• Balaena albicans Muller, 1776 accepted as Delphinapterus leucas (Pallas, 1776)
• Balaena aleoutiensis Van Beneden, 1865 accepted as Eubalaena japonica (Lacépède, 1818)
• Balaena allamack Gray, 1846 accepted as Megaptera novaeangliae (Borowski, 1781)
• Balaena alutiensis Beddard, 1900 accepted as Eubalaena japonica (Lacépède, 1818)
• Balaena ampullata Forster, 1770 accepted as Hyperoodon ampullatus (Forster, 1770)
• Balaena antarctica Lesson, 1828 accepted as Eubalaena australis (Desmoulins, 1822)
• Balaena antarctica Temminck, 1840 or 1841 accepted as Eubalaena japonica (Lacépède, 1818)
• Balaena antipodarum Gray, 1864 accepted as Caperea marginata (Gray, 1846)
• Balaena antipodarum Tomilin, 1957 accepted as Balaenoptera physalus (Linnaeus, 1758)
• Balaena antipodum Gray, 1843 accepted as Eubalaena australis (Desmoulins, 1822)
• Balaena antiquorum Fischer, 1829 accepted as Balaenoptera physalus (Linnaeus, 1758)
• Balaena atlanticus Hurdis, 1897 accepted as Megaptera novaeangliae (Borowski, 1781)
• Balaena australis Desmoulins, 1822 accepted as Eubalaena australis (Desmoulins, 1822)
• Balaena australis Flower, 1885 accepted as Eubalaena japonica (Lacépède, 1818)
• Balaena biscayensis Eschricht, 1860 accepted as Eubalaena glacialis (Müller, 1776)
• Balaena boops Fabricius, 1780 accepted as Megaptera novaeangliae (Borowski, 1781)
• Balaena boops Kerr, 1792 accepted as Eschrichtius robustus (Lilljeborg, 1861)
• Balaena boops Linnaeus, 1758 accepted as Balaenoptera physalus (Linnaeus, 1758)
• Balaena borealis Fischer, 1829 accepted as Balaenoptera musculus (Linnaeus, 1758)
• Balaena capensis Gray, 1868 accepted as Eubalaena australis (Desmoulins, 1822)
• Balaena cisarctica Cope, 1865 accepted as Eubalaena glacialis (Müller, 1776)
• Balaena culammak Gray, 1870 accepted as Eubalaena japonica (Lacépède, 1818)
• Balaena cullamach Cope, 1868 accepted as Eubalaena japonica (Lacépède, 1818)
• Balaena cullamacha Beddard, 1900 accepted as Eubalaena japonica (Lacépède, 1818)
• Balaena eubalaena Gray, 1871 accepted as Eubalaena glacialis (Müller, 1776)
• Balaena euskariensis Real, 1890 accepted as Eubalaena glacialis (Müller, 1776)
• Balaena gibbosa Cope, 1868 accepted as Balaenoptera acutorostrata Lacépède, 1804
• Balaena gibbosa Erxleben, 1777 accepted as Eschrichtius robustus (Lilljeborg, 1861)
• Balaena gibbosa Gray, 1843 accepted as Megaptera novaeangliae (Borowski, 1781)
• Balaena glacialis Bonnaterre, 1789 accepted as Eubalaena glacialis (Müller, 1776)
• Balaena glacialis Borowski, 1781 accepted as Eubalaena glacialis (Müller, 1776)
• Balaena glacialis Mueller, 1776 accepted as Eubalaena australis (Desmoulins, 1822)
• Balaena glacialis australis Scheffer & Rice, 1963 accepted as Eubalaena australis (Desmoulins, 1822)
• Balaena glacialis glacialis Scheffer & Rice, 1963 accepted as Eubalaena glacialis (Müller, 1776)
• Balaena hectori Gray, 1874 accepted as Eubalaena australis (Desmoulins, 1822)
• Balaena islandica Gmelin, 1788 accepted as Eubalaena glacialis (Müller, 1776)
• Balaena japonica Lacépède, 1804 accepted as Eubalaena japonica (Lacépède, 1818)
• Balaena kuliomoch Chamisso, 1825 accepted as Eubalaena japonica (Lacépède, 1818)
• Balaena lalandii Fischer, 1829 accepted as Megaptera novaeangliae (Borowski, 1781)
• Balaena longimana Rudolphi, 1832 accepted as Megaptera novaeangliae (Borowski, 1781)
• Balaena lunulata Lacépède, 1818 accepted as Eubalaena japonica (Lacépède, 1818)
• Balaena mangidach Chamisso, 1825 (uncertain > nomen dubium)
• Balaena marginata Gray, 1846 accepted as Caperea marginata (Gray, 1846)
• Balaena maximus accepted as Balaenoptera musculus (Linnaeus, 1758)
• Balaena maximus borealis Knox, 1838 accepted as Balaenoptera musculus Van Beneden & Gervais, 1880 accepted as Balaenoptera physalus (Linnaeus, 1758)
• Balaena mediterranea Gray, 1870 accepted as Eubalaena glacialis (Müller, 1776)
• Balaena microcephala Tomilin, 1957 accepted as Balaenoptera acutorostrata Lacépède, 1804
• Balaena minima Rapp, 1837 accepted as Balaenoptera acutorostrata Lacépède, 1804
• Balaena minima borealis Knox, 1838 accepted as Balaenoptera acutorostrata Lacépède, 1804
• Balaena musculus Linnaeus, 1758 accepted as Balaenoptera musculus (Linnaeus, 1758)
• Balaena mysticetus Linnaeus, 1758
• Balaena mysticetus antarcticus Schlegel, 1841 accepted as Eubalaena australis (Desmoulins, 1822)
• Balaena mysticetus arctica Schlegel, 1841 accepted as Balaena mysticetus Linnaeus, 1758
• Balaena mysticetus borealis Lesson, 1828 accepted as Balaena mysticetus Linnaeus, 1758
• Balaena mysticetus groenlandica Kerr, 1792 accepted as Balaena mysticetus Linnaeus, 1758
• Balaena mysticetus islandica Kerr, 1792 accepted as Eubalaena glacialis (Müller, 1776)
• Balaena mysticetus major Kerr, 1792 accepted as Balaenoptera physalus (Linnaeus, 1758)
• Balaena mysticetus pitlekajensis Malm, 1883 accepted as Balaena mysticetus Linnaeus, 1758
• Balaena mysticetus roysii Dall, 1874 accepted as Balaena mysticetus Linnaeus, 1758
• Balaena nodosa Bonnaterre, 1789 accepted as Megaptera novaeangliae (Borowski, 1781)