• 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 meriani (Ooster, 1865) †: Cretaceous, Lower
• Absurdaster puezensis Kroh, Lukeneder & Gallemí, 2014 †: Barremian
• Absurdaster puezensis Kroh, Lukeneder & Gallemí, 2014 †: Hauterivian
• Abyssomelania campbellae Kaim, R. G. Jenkins, Tanabe & Kiel, 2014 †: Albian
• Abyssomelania cramptoni Kaim, R. G. Jenkins, Tanabe & Kiel, 2014 †: Maastrichtian
• Abyssomelania cramptoni Kaim, R. G. Jenkins, Tanabe & Kiel, 2014 †: Campanian
• Acanthodiaulax mclayi Schweitzer, Feldmann, Fam, Hessin, Hetrick, Nyborg & Ross, 2003 †: Santonian
• Acanthopora formosa Canu & Bassler, 1926 †: Valanginian
• Acanthopora icaunensis d'Orbigny, 1850 †: Hauterivian
• Acanthopora icaunensis d'Orbigny, 1850 †: Valanginian
• Acanthopora neocomiensis d'Orbigny, 1850 †: Hauterivian
• Acanthopora neocomiensis d'Orbigny, 1850 †: Valanginian
• Acanthopora pulchella de Loriol, 1868 †: Hauterivian
• Acanthopora pulchella de Loriol, 1868 †: Valanginian
• Acesta marlburiensis (H. Woods, 1917) †: Santonian
• Acesta marlburiensis (H. Woods, 1917) †: Coniacian
• Acesta marlburiensis (H. Woods, 1917) †: Turonian
• Acesta marlburiensis (H. Woods, 1917) †: Cenomanian
• Acharax stantoni (H. E. Vokes, 1955) †: Albian
• Acharax stantoni (H. E. Vokes, 1955) †: Barremian
• Aciculiscala coffea Dockery, 1993 †: Campanian
• Acirsa gravida Sohl, 1964 †: Campanian
• Acirsa pacifica (Wilckens, 1922) †: Maastrichtian
• Acirsa pacifica (Wilckens, 1922) †: Campanian
• Acirsa pacifica (Wilckens, 1922) †: Santonian
• Acoscinopleura albaruthenica Koromyslova, Martha & Pakhnevich, 2018 †: Campanian
• Acoscinopleura artemis (d'Orbigny, 1851) †: Maastrichtian
• 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 occulta Koromyslova, Martha & Pakhnevich, 2018 †: Maastrichtian
• Acoscinopleura rimosa Voigt, 1956 †: Maastrichtian
• Acoscinopleura rugica Voigt, 1956 †: Maastrichtian
• Acoscinopleura vindocinensis (Filliozat, 1908) †: Santonian
• Acrocidaris arginensis Weber, 1934 †: Hauterivian
• Acropeltis atlantica Rey, Taj-Eddine & Witam, 1989 †: Valanginian
• Acropeltis atlantica Rey, Taj-Eddine & Witam, 1989 †: Berriasian
• Acrostele incertum H.-Z. Pan, 1982 †: Cretaceous, Upper
• Acteon marullensis A. d'Orbigny, 1850 †: Hauterivian
• Acteonella agricolai Vidal, 1921 †: Maastrichtian
• Acteonella crassa (Dujardin, 1835) †: Santonian
• Acteonella fusiformis Coquand, 1865 †: Aptian
• Acteonella grossouvrei Cossmann, 1897 †: Turonian
• Acteonella torrubiai Vidal, 1949 †: Santonian
• Actinopora auei Voigt, 1996 †: Cretaceous
• Actinopora brongniarti (Milne-Edwards, 1837) †: Cretaceous
• Actinopora campicheana (d'Orbigny, 1853) †: Valanginian
• Actinopora convexa (Römer, 1840) †: Santonian
• Actinopora gregaria (d'Orbigny, 1850) †: Cretaceous
• Actinopora incrassata Canu, 1911 †: Cretaceous
• Actinopora moneta (d'Orbigny, 1853) †: Santonian
• Actinopora radiata (Woodward, 1833) †: Cretaceous
• Actinopora regularis Gregory, 1909 †: Cretaceous
• Actinopora robertsoniana Canu, 1911 †: Cretaceous
• Actinopora stellata (Koch & Dunker, 1837) †: Cretaceous
• Actinotaxia magna Hamm, 1881 †: Maastrichtian
• Actinotrigonia bathurstensis L. R. Cox, 1964 †: Cenomanian
• Adercotryma kuhnti Alegret & Thomas, 2009 †: Maastrichtian
• Aechmella akrabatensis Favorskaya, 1990 †: Cretaceous, Upper
• Aechmella fertilis Voigt, 1967 †: Campanian
• Aechmella inflata (Hennig, 1892) †: Campanian
• Aechmella lahuseni Voigt, 1967 †: Maastrichtian
• Aechmella lanceolata Voigt, 1962 †: Cretaceous
• Aechmella lateaperta (Brydone, 1912) †: Cretaceous
• Aechmella microstoma (Marsson, 1887) †: Cretaceous
• Aechmella missilis (Stoliczka, 1873) †: Cretaceous
• Aechmella peneclausa (Brydone, 1912) †: Cretaceous
• Aechmella pentapora (d'Orbigny, 1851) †: Maastrichtian
• Aechmella pentapora (d'Orbigny, 1851) †: Santonian
• Aechmella rangiauriensis Taylor & Gordon, 2007 †: Maastrichtian
• Aechmella schmitti Voigt, 1930 †: Cretaceous
• Aechmella tenuis Berthelsen, 1962 †: Cretaceous
• Aechmella ventricosa Voigt, 1924 †: Cretaceous
• Aechmella viskovae Koromyslova, Baraboshkin & Martha, 2018 †: Maastrichtian
• Aechmella waltheri Voigt, 1930 †: Cretaceous