• Abathomphalus intermedius (Bolli, 1951) †: Cretaceous, Upper
• Abathomphalus mayaroensis (Bolli, 1951) †: Cretaceous, Upper
• Abdomenopora schumacheri Voigt, 1995 †: Maastrichtian
• Abelleicidaris borjnadorensis Vadet, Marignac, Nicolleau & Reboul, 2007 †: Berriasian
• Absurdaster hungaricus Kroh, Lukeneder & Gallemí, 2014 †: Hauterivian
• Absurdaster meriani (Ooster, 1865) †: Cretaceous, Lower
• Absurdaster puezensis Kroh, Lukeneder & Gallemí, 2014 †: Barremian
• Abyssomelania campbellae Kaim, R. G. Jenkins, Tanabe & Kiel, 2014 †: Albian
• Abyssomelania cramptoni Kaim, R. G. Jenkins, Tanabe & Kiel, 2014 †: Campanian
• Acanthopora formosa Canu & Bassler, 1926 †: Valanginian
• Acanthopora icaunensis d'Orbigny, 1850 †: Hauterivian
• Acanthopora neocomiensis d'Orbigny, 1850 †: Hauterivian
• Acanthopora pulchella de Loriol, 1868 †: Valanginian
• Acesta marlburiensis (H. Woods, 1917) †: Coniacian
• Acesta marlburiensis (H. Woods, 1917) †: Turonian
• Acharax stantoni (H. E. Vokes, 1955) †: Albian
• Acharax stantoni (H. E. Vokes, 1955) †: Valanginian
• Aciculiscala acuta Sohl, 1963 †: Cretaceous, Upper
• Aciculiscala coffea Dockery, 1993 †: Campanian
• Acirsa gravida Sohl, 1964 †: Campanian
• Acirsa pacifica (Wilckens, 1922) †: Maastrichtian
• Acirsa pacifica (Wilckens, 1922) †: Santonian
• Acoscinopleura albaruthenica Koromyslova, Martha & Pakhnevich, 2018 †: Campanian
• Acoscinopleura clio (d'Orbigny, 1851) †: Campanian
• Acoscinopleura crassa Koromyslova, Martha & Pakhnevich, 2018 †: Maastrichtian
• Acoscinopleura dualis Koromyslova, Martha & Pakhnevich, 2018 †: Maastrichtian
• Acoscinopleura fallax Voigt, 1956 †: Maastrichtian
• Acoscinopleura foliacea (Voigt, 1930) †: Campanian
• Acoscinopleura rugica Voigt, 1956 †: Maastrichtian
• Acriaster sergipensis Smith in Smith & Benggtson, 1991 †: Albian
• Acrocidaris arginensis Weber, 1934 †: Hauterivian
• Acrocidaris marocense Vadet, Marignac, Nicolleau & Reboul, 2007 †: Berriasian
• Acrocoelum cereum Sohl, 1961 †: Campanian
• Acropeltis atlantica Rey, Taj-Eddine & Witam, 1989 †: Berriasian
• Acrostele incertum H.-Z. Pan, 1982 †: Cretaceous, Upper
• Acteon cretacea Gabb, 1862 †: Cretaceous
• Acteon marullensis A. d'Orbigny, 1850 †: Hauterivian
• Acteonella agricolai Vidal, 1921 †: Maastrichtian
• Acteonella borneensis C. P. Nuttall & Leong, 1972 †: Cretaceous, Upper
• Acteonella crassa (Dujardin, 1835) †: Santonian
• Acteonella crassa (Dujardin, 1835) †: Coniacian
• Acteonella decorata Hacobjan, 1976 †: Cenomanian
• Acteonella fusiformis Coquand, 1865 †: Aptian
• Acteonella grossouvrei Cossmann, 1897 †: Turonian
• Acteonella involuta Coquand, 1860 †: Santonian
• Acteonella torrubiai Vidal, 1949 †: Santonian
• Actinopora brongniarti (Milne-Edwards, 1837) †: Cretaceous
• Actinopora convexa (Römer, 1840) †: Santonian
• Actinopora gregaria (d'Orbigny, 1850) †: Cretaceous
• Actinopora moneta (d'Orbigny, 1853) †: Santonian
• Actinopora regularis Gregory, 1909 †: Cretaceous
• Actinopora robertsoniana Canu, 1911 †: Cretaceous
• Actinopora stellata (Koch & Dunker, 1837) †: Cretaceous
• Actinopora striata Canu, 1911 †: Cretaceous
• Actinopora sulcata (Gregory, 1909) †: Maastrichtian
• Actinotaxia magna Hamm, 1881 †: Maastrichtian
• Actinotrigonia bathurstensis L. R. Cox, 1964 †: Cenomanian
• Aechmella cucullata (Römer, 1841) †: Santonian
• Aechmella fertilis Voigt, 1967 †: Campanian
• Aechmella lateaperta (Brydone, 1912) †: Cretaceous
• Aechmella missilis (Stoliczka, 1873) †: Cretaceous
• Aechmella peneclausa (Brydone, 1912) †: Cretaceous
• Aechmella pentapora (d'Orbigny, 1851) †: Campanian
• Aechmella pentapora (d'Orbigny, 1851) †: Santonian
• Aechmella pentapora (d'Orbigny, 1851) †: Coniacian
• Aechmella rangiauriensis Taylor & Gordon, 2007 †: Campanian
• Aechmella schmitti Voigt, 1930 †: Cretaceous
• Aechmella tenuis Berthelsen, 1962 †: Cretaceous
• Aechmella ventricosa Voigt, 1924 †: Cretaceous