Stratigraphic time - taxa
species Abacodendron lutuginii Radcz. (Mississippian)
genus Absenticosta Lazarev, 1991 (Mississippian)
species Absenticosta uldzejtuensis Suursuren & Lazarev, 1991 (Mississippian)
genus Acambona White, 1865 (Mississippian)
genus Acanthocosta Roberts, 1971 (Mississippian)
genus Acanthoplecta Muir-Wood & Cooper, 1960 (Mississippian)
genus Acanthospirina Schuchert & LeVene, 1929 (Mississippian)
family Acherontiscidae Carroll, 1967 (Mississippian)
species Acitheca ambigua (Sternb.) Němejc (Kasimovian)
superorder Actinistia (Middle Devonian - recent)
genus Actinoconchus Mccoy, 1844 (Mississippian)
class Actinopterygii Klein, 1885 - ray-finned fishes (Upper Silurian - recent)
genus Acuminothyris Roberts, 1963 (Mississippian)
genus Adectorhynchus Henry & Gordon, 1985 (Mississippian)
family Adelogyrinidae Brough & Brough, 1967 (Mississippian)
order Adelospondyli (Mississippian)
genus Adminiculoria Waterhouse & Gupta, 1979 (Mississippian)
species Alanops magnificus Racheboeuf, Vannier & Anderson, 2002 (Gzhelian)
species Alethopteris urophylla (Brongn.) Göpp. (Bashkirian)
species Alloiopteris angustissima (Sternb.) H.Potonié (Bashkirian)
kingdom Amoebozoa Lühe, 1913 emend. Cavalier-Smith, 1998 (Neoproterozoic - recent)
species Amphoracrinus gilbertsoni (Phillips, 1836) (Mississippian)
species Annularia radiata (Brongn.) Sternb. (Bashkirian)
species Annularia spinulosa Sternb. (Carboniferous)
genus Anomalonema Raymond, 1946 (Carboniferous)
species Antennipatus montceauensis Garwood, Edgecombe & Giribet, 2016 (Gzhelian)
species Anthracotarbus hintoni Kjellesvig-Waering, 1969 (Carboniferous)
species Anthroosasterias stibareus Blake, 2017 (Mississippian)
species Aorocrinus immaturus (Wachsmuth & Springer, 1889) (Tournaisian)
subspecies Archegonus aprathensis richteri Osmolska, 1968 (Visean)
species Architarbus hoffmanni Guthörl, 1934 (Carboniferous)
phylum Arthropoda Gravenhorst, 1843 - arthropods (Cambrian - recent)
class Asteroidea De Blainville, 1830 (Lower Ordovician - recent)
species Asterophyllites charaeformis (Sternb.) Göpp. (Bashkirian)
species Asterophyllites longifolius (Sternb.) Brongn. (Bashkirian)
species Bairdiacypris deloi Bradfield, 1935 (Carboniferous)
species Bandringa rayi Zangerl, 1969 (Moscovian)
species Belotelson magister Packard, 1886 (Moscovian)
species Belotelson traquairi (Peach, 1882) (Moscovian)
species Bollandia persephone (Hahn & Hahn, 1970) (Visean)
species Bornatarbus mayasii (Haupt in Nindel, 1955) (Carboniferous)
phylum Brachiopoda Duméril, 1806 - lamp shells (Cambrian - recent)
species Brachymetopus maccoyi (Portlock, 1843) (Tournaisian)
species Brachymetopus ouralicus (De Verneuil, 1845) (Visean)
species Breviphillipsia sampsoni (Vogdes, 1888) (Tournaisian)
species Calamites cistii Brongn. (Bashkirian)
species Calamites schuetzeiformis Kidst. et Jongm. (Bashkirian)
species Calamites suckowi Brongn. (Bashkirian)
species Calamites undulatus Sternb. (Carboniferous)
species Caledonicratis caridum Zapalski & Clarkson, 2015 (Visean)
class Cephalopoda Cuvier, 1795 - cephalopods (Middle Cambrian - recent)
species Cervifurca nasuta Zangerl, 1997 (Pennsylvanian)
phylum Chaetognatha Leuckart, 1854 - arrow worms (Cambrian - recent)
phylum Choanozoa Cavalier-Smith, 1981 emend. 1983 (Neoproterozoic - recent)
class Chondrichthyes Huxley, 1880 - cartilaginous fishes (Upper Silurian - recent)
superorder Chondrostei Müller, 1844 (Silurian - recent)
order Coelacanthiformes Berg, 1937 - coelacanth (Carboniferous - recent)
subclass Coelacanthimorpha (Lower Devonian - recent)
superorder Coleopteroidea Handlirsch, 1903 (Carboniferous - recent)
species Comptonaspis swallowi (Shumard, 1855) (Tournaisian)
species Concavicaris bradleyi (Meek, 1872) (Mississippian)
species Conularia quadrisulcata Sowerby, 1821 (Carboniferous)
species Conularia subcarbonaria Meek & Worthen, 1865 (Mississippian)
species Cordaites karvinensis Šimůnek (Bashkirian)