Abramis brama (Linnaeus, 1785)
Acanthocardia tuberculata (Linnaeus, 1758)
Accipiter gentilis (Linnaeus, 1758)
Accipiter nisus (Linnaeus, 1758)
Acer palmatum (C. P. Thunberg ex A. Murray)
Aceros corrugatus (Temminck, 1832)
Achatina schweinfurthi von Martens, 1873
Acherontia atropos (Linnaeus, 1758)
Acinonyx jubatus (Schreber, 1775)
Acipenser sturio Linnaeus, 1758
Acrocephalus arundinaceus (Linnaeus, 1758)
Acrocodia indica (Desmarest, 1819)
Acropora cervicornis (Lamarck, 1816)
Acryllium vulturinum (Hardwicke, 1834)
Actitis hypoleucos Linnaeus, 1758
Aegithalos caudatus (Linnaeus, 1758)
Aegolius funereus (Linnaeus, 1758)
Aegypius monachus (Linnaeus, 1766)
Aepyceros melampus (Lichtenstein, 1812)
Aepyornis maximus Geoffroy Saint-Hilaire, 1851
Aequipecten seniensis (Lamarck,1819)
Aerodramus fuciphagus (Thunberg, 1812)
Agenysa caedemadens (Lichtenstein, 1795)
Agnostus pisiformis Wahlenberg 1818
Agouti paca (Linnaeus, 1766) – synoniem of Cuniculus paca (Linnaeus, 1766)
Agrius convolvuli (Linnaeus, 1758)
Ailuropoda melanoleuca (David, 1869)
Aiphanes minima (Gaertn.) Burret
Aix galericulata (Linnaeus, 1758)
Ajacicyathus ajax Taylor, 1910
Ajaciella cyanophyta Unknown author
Alauda arvensis Linnaeus, 1758
Alaus oculatus (Linnaeus, 1758)
Alca torda islandica Brehm, 1831
Alcedo atthis (Linnaeus, 1758)
Alcelaphus caama (Geoffroy Saint-Hilaire, 1803)
Aldabrachelys gigantea (Schweigger, 1812)
Alligator mississippiensis (Daudin, 1802)
Allopleuron hofmanni (Gray 1831)
Allostethus indicum (Burmeister, 1838)
Alopias vulpinus (Bonnaterre, 1788)
Alopochen aegyptiaca (Linnaeus, 1766)
Alouatta seniculus (Linnaeus, 1766)
Alytes obstetricans Laurenti, 1768
Amaurobius similis (Blackwall, 1861)
Amazilia fimbriata (Gmelin, 1788)
Amblyraja radiata (Donovan, 1808)
Amblysomus hottentotus (Smith, 1829)
Ameiva ameiva (Linnaeus, 1758)
Amphacanthus javus (Linnaeus, 1766) – synoniem of Siganus javus (Linnaeus, 1766)
Amphiprion ocellaris Cuvier, 1830
Amphisbaena fuliginosa Linnaeus, 1758
Ampullaria ampullacea (Linnaeus, 1758) – synoniem of Pila ampullacea (Linnaeus, 1758)
Anancus arvernensis Croizet & Jobert, 1828
Anarhichas lupus Linnaeus, 1758
Anarosaurus heterodontus Dames 1890
Anarosaurus heterodontus Rieppel & Lin 1995 – synoniem of Anarosaurus heterodontus Dames 1890
Anas platyrhynchos Linnaeus, 1758
Anaxyrus terrestris (Bonnaterre, 1789)
Andrias davidianus (Blanchard, 1871)
Anguilla anguilla (Linnaeus, 1758)
Anguis fragilis Linnaeus, 1758
Anhanguera spielbergi (Veldmeijer, 2003) – synoniem of Coloborhynchus spielbergi Veldmeijer, 2003
Anhinga anhinga (Linnaeus, 1766)
Anobium punctatum (De Geer, 1774)
Anodorhynchus hyacinthinus (Latham, 1790)
Anomoepus pienkovskii Gierlinski 1991
Antheraea pernyi Guérin-Méneville, 1855
Anthrenus verbasci (Linnaeus, 1767)
Anthriscus sylvestris (L.) Hoffm.
Anthropoides virgo (Linnaeus, 1758)
Anthus pratensis (Linnaeus, 1758)
Antidorcas marsupialis (Zimmermann, 1780)
Antilope cervicapra (Linnaeus, 1758)
Aonyx cinerea (Illiger, 1815) – synoniem of Aonyx cinerea (Illiger, 1815)
Aonyx cinereus (Illiger, 1815)
Aphrocallistes beatrix Gray, 1858
Aphrodita aculeata Linnaeus, 1758
Apodemus agrarius (Pallas, 1771)
Apodemus sylvaticus (Linnaeus, 1758)
Aptenodytes forsteri G. R. Gray, 1844
Aptenodytes patagonicus Miller, 1778
Apteryx mantelli Bartlett, 1852
Aquila nipalensis Hodgson, 1833
Ara chloroptera G. R. Gray, 1859 – synoniem of Ara chloropterus G. R. Gray, 1859
Ara chloropterus G. R. Gray, 1859
Araucaria araucana (Molina) K. Koch
Archaeopteryx lithographica Meyer 1861
Architectonica carocollata (Lamarck,1822)
Arctica islandica (Linnaeus, 1767)
Ardenna gravis (O'Reilly, 1818)
Ardeotis kori (Burchell, 1822)
Ardipithecus ramidus (White, Suwa & Asfaw, 1994)
Arenaria interpres (Linnaeus, 1758)
Argiope bruennichi (Scopoli, 1772)
Armillaria mellea (Vahl) P.Kumm.
Artibeus jamaicensis Leach, 1821
Artocarpus integer (Thunb.) Merr.
Arvicola amphibius (Linnaeus, 1758)
Asaphus kowalewskii (Lawrow 1856)
Ascaris leptoptera Rudolphi, 1809
Aschiphasma annulipes Westwood, 1835
Asio flammeus (Pontoppidan, 1763)
Aspidella terranovica Billings 1872
Aspidimorpha miliaris (Fabricius, 1775)
Astarte borealis (Schumacher, 1817)
Asterias rubens Linnaeus, 1758
Astropecten irregularis (Pennant, 1777)
Ateles paniscus (Linnaeus, 1758)
Aulacorhynchus prasinus Gould, 1835
Australaster giganteus Etheridge Jr., 1892
Australopithecus afarensis Johanson & White, 1978
Australopithecus africanus Dart, 1925
Autographa gamma (Linnaeus, 1758)
Aythya ferina (Linnaeus, 1758)
Aythya fuligula (Linnaeus, 1758)