Stratigrafické období - taxony
rod Aboriginella Koneva, 1983 (kambrium)
druh Aboriginella denudata Koneva, 1983 (kambrium)
druh Acadolenus snajdri Fatka & Kordule, 1981 (drum)
druh Acadoparadoxides sacheri (Barrande, 1852) (drum)
druh Acadoparadoxides sirokyi Šnajdr, 1986 (drum)
druh Acanthocystites briareus Barrande, 1887 (drum)
druh Acanthotretella spinosa Holmer & Caron, 2006 (wuliuan)
rod Acareorthis Roberts, 1990 (kambrium)
rod Acidotocarena Liu, 1979 (kambrium)
druh Acinocricus stichus Conway Morris & Robison, 1988 (wuliuan)
druh Acrothele gigantea Želízko, 1911 (drum)
druh Acrothele primaeva (de Verneuil & Barrande in de Prado, 1860) (wuliuan)
druh Acrothele quadrilineata Pompeckj, 1895 (drum)
druh Actaeus armatus Simonetta, 1977 (kambrium)
druh Adara alea Martin (drum)
druh Adelogonus prichardi Smith, Paterson & Brock, 2018 (guzhangian)
druh Agraulos ceticephala (Barrande, 1846) (drum)
druh Agraulos socialis Billings, 1874 (drum)
druh Akadocrinus jani Prokop, 1962 (drum)
druh Akadocrinus knizeki Fatka & Kordule, 1991 (drum)
druh Albertella helena Walcott, 1908 (wuliuan)
druh Alfaites romeo Valent, Fatka & L. Marek, 2019 (drum)
druh Alliumella baltica Fanderflit (drum)
druh Allonnia tintinops Bengtson & Collins, 2015 (wuliuan)
druh Allonnia tripodophora Doré & Reid, 1965 (wuliuan)
druh Almohadella braunae Streng, 1999 (drum)
druh Alokistocare idahoense Resser, 1939 (wuliuan)
druh Alokistocare laticaudum Resser, 1939 (wuliuan)
druh Alokistocarella brighamensis Resser, 1939 (wuliuan)
druh Alokistocarella occidens Resser, 1939 (wuliuan)
druh Altiocculus harrisi (Robison, 1971) (drum)
druh Amanitichnus omittus Chlupáč & Mikuláš, 1995 (drum)
druh Amiskwia sagittiformis Walcott, 1911 (wuliuan)
druh Ammagnostus antarcticus Bentley, Jago & Cooper, 2009 (guzhangian)
druh Ammagnostus beltensis (Lochman in Lochman & Duncan, 1944) (guzhangian)
říše Amoebozoa Lühe, 1913 emend. Cavalier-Smith, 1998 - měňavkovci (neoproterozoikum - recent)
druh Amplectobelua stephenensis Daley & Budd, 2010 (kambrium)
druh Amplectobelua symbrachiata Hou, Bergström & Ahlberg, 1995 (kambrium)
druh Annulum squamaceum (Volkova) Martin (drum)
druh Anopolenus henrici Salter, 1864 (drum)
druh Aragocystites belli Zamora, 2013 (drum)
druh Archaeocothurnus bifidus (Ubaghs & Robison, 1988) (drum)
druh Archaeodiscina bicostata Volkova (drum)
druh Archiasterella coriacea Bengtson & Collins, 2015 (wuliuan)
kmen Arthropoda Gravenhorst, 1843 - členovci (kambrium - recent)
druh Asaphiscus wheeleri (Meek, 1872) (drum)
druh Athabaskia bithus (Walcott, 1916) (wuliuan)
druh Athabaskia howelli (Walcott, 1886) (wuliuan)
druh Athabaskia wasatchensis (Resser, 1939) (wuliuan)
druh Atlascystis acantha Woodgate, Dunn, Thompson, Formery, Zamora & Rahman, 2025 (stage 4 - wuliuan)
druh Austromarrella klausmuelleri Haug, Castellani, Haug, Waloszek & Maas, 2013 (wuliuan)
druh Aysheaia pedunculata Walcott, 1911 (kambrium)
druh Aysheaia prolata Robison, 1985 (drum)
druh Bailiella lantenoisi (Mansuy, 1916) (wuliuan)
druh Baltagnostus eurypyx Robison, 1964 (drum)
druh Baltisphaeridium cerinum Volkova (drum)
druh Banffia constricta Walcott, 1911 (wuliuan)
druh Bashania bashanensis Qui, 1983 (wuliuan)
druh Bathynotus holopygus (Hall, 1859) (wuliuan)
druh Bathyuriscus brighamensis Resser, 1939 (wuliuan)
druh Bathyuriscus fimbriatus Robison, 1964 (drum)
druh Beckwithia typa Resser, 1931 (guzhangian)
druh Benxiaspis benxiensis Guo & An, 1982 (wuliuan)
druh Biaverta reineri Öpik, 1967 (guzhangian)
druh Blackwelderia repanda Öpik, 1967 (guzhangian)
druh Bohemiacinctus havliceki (Fatka & Kordule, 2001) (drum)
druh Bohemiella romingeri (Barrande, 1848) (drum)
druh Bolaspidella drumensis (Robison, 1964) (drum)
druh Botsfordia snajdri Mergl & Šlehoferová, 1990 (drum)
kmen Brachiopoda Duméril, 1806 - ramenonožci (kambrium - recent)
druh Brahimorthis pompeckiana Havlíček, 1977 (drum)
druh Braintreella rogersi (Walcott, 1884) (drum)
druh Branchiocaris pretiosa (Resser, 1929) (drum)