- Alcelaphus buselaphus (Pallas, 1766) [1]
- Alcelaphus buselaphus buselaphus (Pallas, 1766) [1]
- Alcelaphus buselaphus cokii Günther, 1884 [1]
- Alcelaphus buselaphus lelwel (Heuglin, 1877) [1]
- Alcelaphus buselaphus major (Blyth, 1869) [1]
- Alcelaphus buselaphus swaynei (P. L. Sclater, 1892) [1]
- Alcelaphus buselaphus tora Gray, 1873 [1]
- Alcelaphus caama (É. Geoffroy Saint-Hilaire, 1803) [1]
- Alcelaphus lichtensteinii (Peters, 1849) [1]
Mammalia → Artiodactyla → Bovidae → Alcelaphinae
- Alces alces (Linnaeus, 1758) [2]
- Alces alces alces (Linnaeus, 1758)
- Alces alces caucasicus Vereshchagin, 1955
- Alces americanus (Clinton, 1822) [2]
- Alces americanus americanus (Clinton, 1822)
- Alces americanus cameloides (Milne-Edwards, 1867)
- Alces brevirostris Kretzoi, 1944 † [3]
- Alces carnutorum (Laugel, 1862) † [3]
- Alces gallicus (Azzaroli, 1952) † [3]
- Alces latifrons (Johnson, 1874) † [3]
- Alces scotti (Lydekker, 1898) † [3]
- †Alces shimeki Hay 1914 [4]
- †Alces (Megaceros) Owen 1844 [5]
- Alces (Megaceros) fossilis Kerr 1792 † [5]
Mammalia → Artiodactyla → Cervidae → Capreolinae
- †Algarolutra majori Malatesta 1978
Mammalia → Carnivora → Mustelidae → Lutrinae → Lutrini
- Alilepus annectens (Schlosser, 1924) †
- Alilepus browni (Hay, 1921) †
- Alilepus dietrichi Fejfar 1961 †
- Alilepus hibbardi White, 1991 †
- Alilepus vagus Gazin, 1934 †
- Alilepus wilsoni White, 1991 †
Mammalia → Lagomorpha → Leporidae → Leporinae
- Alionycteris paucidentata Kock, 1969 [6]
Mammalia → Chiroptera → Pteropodidae → Pteropodinae
- Allactaga (Allactaga) F. Cuvier, 1837 [7]
- Allactaga (Allactaga) elater Lichtenstein, 1825 [7]
- Allactaga (Allactaga) firouzi Womochel, 1978 [7]
- Allactaga (Allactaga) hotsoni Thomas, 1920 [7]
- Allactaga (Allactaga) major Kerr, 1792 [7]
- Allactaga (Allactaga) severtzovi Vinogradov, 1925 [7]
- Allactaga (Allactaga) vinogradovi Argyropulo, 1941 [7]
- Allactaga (Orientallactaga) Shenbrot, 1984 [8]
- Allactaga (Orientallactaga) balikunica Hsia and Fang, 1964 [8]
- Allactaga (Orientallactaga) bullata Allen, 1925 [8]
- Allactaga (Orientallactaga) sibirica Forster, 1778 [8]
- Allactaga (Paralactaga) Young, 1927 [9]
- Allactaga (Paralactaga) euphratica Thomas, 1881 [9]
- Allactaga (Paralactaga) williamsi Thomas, 1897 [9]
- Allactaga (Scarturus) Gloger, 1841
- Allactaga (Scarturus) tetradactyla Lichtenstein, 1823 [10]
- Allactaga toussi Darvish, Hajjar, Matin, Haddad and Akbary rad, 2008 [11]
Mammalia → Rodentia → Dipodoidea → Dipodidae → Allactaginae
- Allactaga F. Cuvier, 1837 [12]
- Allactodipus Kolesnikov, 1937 [12]
- Pygeretmus Gloger, 1841 [12]
Mammalia → Rodentia → Dipodoidea → Dipodidae
- Allactodipus bobrinskii Kolesnikov, 1937 [13]
Mammalia → Rodentia → Dipodoidea → Dipodidae → Allactaginae
, Allenopithecus
, Allocebus
, Allocricetulus
- Camptomus Marsh 1889 †
- Eleutherodontida Kermack et al. 1998 †
- Euharamiyida Bi et al. 2014 †
- Fractinus Higgins 2003 †
- Gondwanatheria Mones 1987 †
- Haramiyavia Jenkins et al. 1997 †
- Haramiyida Hahn 1989 †
- Multituberculata Cope 1884 †
- Thomasia Poche 1908 †
Mammalia
- †Alopocosmodon hadrus Scott et al. 2013 [14]
Animalia → Chordata → Mammalia → Multituberculata → Microcosmodontidae
- Alouatta arctoidea Cabrera, 1940 [15]
- Alouatta belzebul (Linnaeus, 1766) tipična [15]
- Alouatta caraya (Humboldt, 1812) [15]
- Alouatta discolor (Spix, 1823) [15]
- Alouatta guariba (Humboldt, 1812) [15]
- Alouatta guariba clamitans Cabrera, 1940 [16]
- Alouatta guariba guariba (Humboldt, 1812) [16]
- Alouatta macconnelli Elliot, 1910 [15]
- Alouatta nigerrima Lönnberg, 1941 [15]
- Alouatta palliata (Gray, 1849) [15]
- Alouatta palliata aequatorialis (Festa, 1903) [17]
- Alouatta palliata coibensis Thomas, 1902 [17]
- Alouatta palliata mexicana Merriam, 1902 [17]
- Alouatta palliata palliata (Gray, 1849) [17]
- Alouatta palliata trabeata Lawrence, 1933 [17]
- Alouatta pigra Lawrence, 1933 [15]
- Alouatta sara Elliot, 1910 [15]
- Alouatta seniculus (Linnaeus, 1766) [15]
- Alouatta seniculus juara Elliot, 1910 [18]
- Alouatta seniculus puruensis Lönnberg, 1941 [18]
- Alouatta seniculus seniculus (Linnaeus, 1766) [18]
- Alouatta ululata Elliot, 1912 [15]
Mammalia → rimates → Atelidae → Simiiformes → Platyrrhini → Alouattinae
- Alouatta Lacépède, 1799 [19]
- †Paralouatta Rivero & Arredondo, 1991 [19]
- †Stirtonia Hershkovitz, 1970 [19]
Mammalia → Primates → Atelidae → Simiiformes → Platyrrhini
- Alticola (Alticola) Blanford, 1881 [20]
- Alticola (Alticola) albicaudus (True, 1894)
- Alticola (Alticola) argentatus (Severtzov, 1879)
- Alticola (Alticola) barakshin Bannikov, 1947
- Alticola (Alticola) montosa (True, 1894)
- Alticola (Alticola) roylei (Gray, 1842)
- Alticola (Alticola) semicanus (G. M. Allen, 1924)
- Alticola (Alticola) stoliczkanus (Blanford, 1875)
- Alticola (Alticola) tuvinicus Ognev, 1950
- Alticola (Aschizomys) Miller, 1899 [20]
- Alticola (Aschizomys) lemminus (Miller, 1898)
- Alticola (Aschizomys) macrotis (Radde, 1862)
- Alticola (Aschizomys) olchonensis Litvinov, 1960
- Alticola (Platycranius) Kastschenko, 1901 [20]
- Alticola (Platycranius) strelzowi (Kastschenko, 1899)
Mammalia → Rodentia → Muroidea → Cricetidae → Arvicolinae
- Aluralagus bensonensis (Gazin, 1942) †
- Aluralagus virginiae Downey 1970 †
Animalia → Chordata → Mammalia → Lagomorpha → Leporidae