Rhineoderma nystii (FOSSIL) de Koninck, 1883 † Mexico, Sonora, Caborca
Cyclonema obsolescens (FOSSIL) J.W. Hall, 1876 †
Strophostylus obtusus (FOSSIL) J.W. Hall, 1859 †
Keeneia occasa (FOSSIL) E.M. Fletcher 1958 † Australia, Maitland
Keeneia ocula (FOSSIL) (Sowerby, 1838 †) United States, Nevada, White Pine
Platyceras oehlerti (FOSSIL) Spitz, 1907 † Italy, Friuli-Venezia Giulia, Udine
Praenatica orthostoma (FOSSIL) (Barrois, 1889 †) France, Pays de la Loire, Loire-Atlantique
Platyschisma ovoidea (FOSSIL) (B. Phillips, 1836 †) UK, Yorkshire
Platyceras oxynotum (FOSSIL) Girty, 1929 † USA, Arkansas, Scott
Platyceras paralium (FOSSIL) White & R.P. Whitfield,1862 † USA, Iowa, Franklin
Platyceras parasiticum (FOSSIL) Trautschold, 1867 † Russia, Moskva, Voskresenskiy
Cyclonema parvimedium (FOSSIL) McLearn, 1924 † Canada, Nova Scotia, Antigonish
Spinyplatyceras parvispinum (FOSSIL) (B.F. Howell, 1945 †)
Platyostoma pastillus (FOSSIL) A.H. Clarke, 1909 †
Platyceras patelliforme (FOSSIL) Holzapfel, 1895 †
Nonorios pater (FOSSIL) (J. Perner, 1903 †) Czech Republic, Vraz
Spinyplatyceras paxiller (FOSSIL) (A.H. Clarke, 1908 †) Canada, Quebec, Cap-des-Rosiers
Nonorios pectinata (FOSSIL) (J. Perner, 1903 †) Czech Republic, Vraz
Cyclonema percarinata (FOSSIL) (J.W. Hall, 1847 †) USA, Iowa, Clinton
Platyostoma perceense (FOSSIL) A.H. Clarke, 1908 † Canada, Quebec, Cap-des-Rosiers
Cyclonema percingulatum (FOSSIL) Billings, 1857 † Canada, Quebec, Minganie-Basse-Cote-Nord
Platyostoma perforatum (FOSSIL) J.J.F. Whiteaves, 1904 † Canada, Severn River
Platyceras pericompsus (FOSSIL) (Whidborne, 1891 †) UK, Devon
Stuckenbergispira permocarbonicus (FOSSIL) (Stuckenberg, 1898 †)
Platyceras perneri (FOSSIL) Tolmachoff, 1930 † Canada, Johns Island
Obscuropsis perplexa (FOSSIL) Horný, 1992 † Czech Republic, Prague
Brokenriveria pharlapensis (FOSSIL) Cook & Camilleri, 1997 † Australia, Queensland, Dalrymple
Rhineoderma piasaensis (FOSSIL) (J.W. Hall, 1856 †) USA, Illinois, Madison
Palaeocapulus piso (FOSSIL) (Walcott, 1884 †) USA, Nevada, Eureka
Keeneia platyschismoides (FOSSIL) R. Etheridge jr., 1902 † Australia, Maitland
Platyceras platystomum (FOSSIL) J.W. Hall, 1859 †
Platyostoma plebeium (FOSSIL) J.W. Hall, 1876 † USA, Indiana, Shelby
Platyostoma pleurotoma (FOSSIL) J.W. Hall, 1879 †
Platyceras plicatile (FOSSIL) J.W. Hall, 1879 †
Cyclonema praecipitum (FOSSIL) (Ulrich & Scofield,1897 †) USA, Tennessee, Bedford