Aaadonta Solem, 1976 (basis of record)
Aaadonta Solem, 1976 (current name source)
Aaadonta Solem, 1976 (extant flag source)
Aaata Semenov, 1906 (current name source)
Aachenosaurus Smets, 1887 † accepted as Aachenoxylon M. Hovelacque, 1889 † (basis of record)
Aachenosaurus Smets, 1887 † accepted as Aachenoxylon M. Hovelacque, 1889 † (extant flag source)
Aaptoryctes Gingerich, 1982 † (current name source)
Abacaria Mosely, 1941 (basis of record)
Abacaria Mosely, 1941 (extant flag source)
Abacidus Leconte, 1863 accepted as Pterostichus Bonelli, 1810 (basis of record)
Abacidus Leconte, 1863 accepted as Pterostichus Bonelli, 1810 (extant flag source)
Abadiella Hupé, 1952 † (basis of record)
Abadiella Hupé, 1952 † (current name source)
Abadiellidae Hupé, 1953 † (basis of record)
Abagazara Distant, 1905 (basis of record)
Abagazara Distant, 1905 (current name source)
Abagazara Distant, 1905 (extant flag source)
Abakolia Bognibova in Bognibova & Shcheglov, 1970 † (basis of record)
Abakolia Bognibova in Bognibova & Shcheglov, 1970 † (current name source)
Abalakeus Southcott, 1994 (basis of record)
Abalakeus Southcott, 1994 (current name source)
Abaliella Strand, 1928 (current name source)
Abalosia Reig & Quintana, 1991 † (current name source)
Abanchogastra Perkins, 1902 (current name source)
Abantis Hoppfer, 1855 (basis of record)
Abantis Hoppfer, 1855 (extant flag source)
Abaratha Moore, 1881 (basis of record)
Abaratha Moore, 1881 (extant flag source)
Abaria Mosely, 1948 (basis of record)
Abaria Mosely, 1948 (extant flag source)
Abas Núñez & Yáñez, 1984 accepted as Liolaemus Wiegmann, 1834 (basis of record)
Abas Núñez & Yáñez, 1984 accepted as Liolaemus Wiegmann, 1834 (source of synonymy)
Abas Núñez & Yáñez, 1984 accepted as Liolaemus Wiegmann, 1834 (extant flag source)
Abastor Gray, 1849 (basis of record)
Abastor Gray, 1849 (current name source)
Abastor Gray, 1849 (extant flag source)
Abathymermis Rubtsov, 1971 (current name source)
Abax Bonelli, 1810 (basis of record)
Abax Bonelli, 1810 (extant flag source)
Abbottella Henderson & Bartsch, 1920 (basis of record)
Abbottella Henderson & Bartsch, 1920 (extant flag source)
Abbottina Jordan & Fowler, 1903 (basis of record)
Abbottina Jordan & Fowler, 1903 (extant flag source)
Abderites Ameghino, 1887 † (current name source)
Abderitidae Ameghino, 1889 † (basis of record)
Abelia Kretzoi, 1938 † (current name source)
Abelisauridae Bonaparte & Novas, 1985 † (basis of record)
Abelisaurus Bonaparte & Novas, 1985 † (basis of record)
Abelisaurus Bonaparte & Novas, 1985 † (current name source)
Abelisaurus Bonaparte & Novas, 1985 † (extant flag source)
Abelmoschomys Baskin, 1986 † (current name source)
Abelodon Brunet, Coppens, Dejax, Flynn et al., 1990 † (current name source)
Abemus Mulsant & Rey, 1876 (basis of record)
Abemus Mulsant & Rey, 1876 (current name source)
Abemus Mulsant & Rey, 1876 (extant flag source)
Aberemoa Aublet, 1775 accepted as Guatteria Ruiz & Pavon, 1794 (basis of record)
Aberranta Hartman, 1965 (basis of record)
Aberranta Hartman, 1965 (extant flag source)
Aberrospadella Kassatkina, 1971 accepted as Parasagitta Tokioka, 1965 (basis of record)
Aberrospadella Kassatkina, 1971 accepted as Parasagitta Tokioka, 1965 (extant flag source)
Abessebdella Richardson, 1975 accepted as Chtonobdella Grube, 1866 (basis of record)
Abessebdella Richardson, 1975 accepted as Chtonobdella Grube, 1866 (extant flag source)
Abgrallaspis Balachowsky, 1948 (basis of record)
Abgrallaspis Balachowsky, 1948 (extant flag source)
Abia Leach, 1817 (basis of record)
Abia Leach, 1817 (current name source)
Abida Turton, 1831 (basis of record)
Abida Turton, 1831 (current name source)
Abida Turton, 1831 (extant flag source)
Abies P. Miller, 1754 (basis of record)
Abisara Felder & Felder, 1860 (basis of record)
Abisara Felder & Felder, 1860 (extant flag source)
Ablabesmyia Johannsen, 1905 (basis of record)
Ablabesmyia Johannsen, 1905 (extant flag source)
Ablattaria Reitter, 1885 accepted as Silpha Linnaeus, 1758 (basis of record)
Ablattaria Reitter, 1885 accepted as Silpha Linnaeus, 1758 (extant flag source)
Ablepharus Fitzinger, 1823 (basis of record)
Aboletylestes Russell, 1964 † (current name source)
Abollifer Vørs, 1992 (basis of record)
Abollifer Vørs, 1992 (extant flag source)
Aborolabis Srivastava, 1969 (basis of record)
Aborolabis Srivastava, 1969 (current name source)
Aborolabis Srivastava, 1969 (extant flag source)
Abracadabrella Zabka, 1991 (basis of record)
Abraeus Leach, 1817 (basis of record)
Abraeus Leach, 1817 (current name source)
Abraeus Leach, 1817 (extant flag source)
Abralia Gray, 1849 (basis of record)
Abralia Gray, 1849 (extant flag source)
Abraliopsis Joubin, 1896 (basis of record)
Abraliopsis Joubin, 1896 (extant flag source)
Abramis Cuvier, 1816 (basis of record)
Abramis Cuvier, 1816 (extant flag source)
Abraxas Leach, 1815 (basis of record)
Abraxas Leach, 1815 (extant flag source)
Abricta Stål, 1866 (basis of record)
Abricta Stål, 1866 (current name source)
Abricta Stål, 1866 (extant flag source)
Abrictosaurus Hopson, 1975 † (basis of record)
Abrictosaurus Hopson, 1975 † (current name source)