Paffrathia aarica (FOSSIL) Heidelberger, 2001 †
Cancelloplatyceras abowsheri (FOSSIL) Cook & al., 2003 †
Platyceras abundans (FOSSIL) (J. Wanner, 1922 †)
Palaeocapulus acutirostre (FOSSIL) (J.W. Hall, 1856 †)
Platyostoma adstrictum (FOSSIL) Lindström, 1884 †
Keeneia afflicta (FOSSIL) Wass, 1967 †
Cyclonema aiens (FOSSIL) (Sardeson, 1896 †)
Platyostoma allardycei (FOSSIL) A.H. Clarke, 1913 †
Rhabdocantha alta (FOSSIL) (J.B.M. Dana, 1849 †)
Platyceras ammon (FOSSIL) J.W. Hall, 1862 †
Cyclonema ampullosum (FOSSIL) J. Perner, 1903 †
Cyclonema ananas (FOSSIL) J. Perner, 1903 †
Strophostylus andrewsi (FOSSIL) J.W. Hall, 1859 †
Platyceras angulatum (FOSSIL) J.W. Hall, 1852 †
Platyceras angustum (FOSSIL) (B. Phillips, 1836 †)
Platyostoma antiquuis (FOSSIL) W.H. Webster, 1905 †
Cyclonema apicatum (FOSSIL) Lindström, 1884 †
Platyschisma applanatum (FOSSIL) C.L.F. von Sandberger& C.L.F. von Sandberger, 1855 †
Rhineoderma arenosa (FOSSIL) de Koninck, 1883 †
Platyceras argo (FOSSIL) J.W. Hall, 1862 †
Spinyplatyceras arkonense (FOSSIL) (Shimer & A.W. Grabau,1902 †)
Platyceras attenuatum (FOSSIL) J.W. Hall, 1859 †
Platyceras auriculatum (FOSSIL) J.W. Hall, 1876 †
Basiplanus baldus (FOSSIL) Heidelberger, 2001 †
Platyschisma barrisi (FOSSIL) Winchell, 1863 †
Spinyplatyceras bartlettense (FOSSIL) (E.L. Yochelson & Kopf,1956 †)
Crossoceras belandi (FOSSIL) Boucot & E.L. Yochelson,1966 †
Cyclonema bellulum (FOSSIL) Billings, 1866 †
Cancellator belua (FOSSIL) Horný, 1992 †
Rhineoderma benediana (FOSSIL) (de Koninck, 1844 †)
Cyclonema bilix (FOSSIL) (T.A. Conrad, 1842 †)
Cyclonema bilix fluctuatum (FOSSIL) (T.A. Conrad, 1842 †)
Platyceras billingsi (FOSSIL) J.W. Hall, 1859 †
Platyceras bistrami (FOSSIL) Knod, 1908 †
Strophostylus bivolve (FOSSIL) White & R.P. Whitfield,1862 †