Platyceras sinuatum (FOSSIL) J.W. Hall, 1859 † Canada, Quebec, Anticosti Island
Platyostoma speciosum (FOSSIL) (Sedgwick & Murchison,1840 †) UK, England, Torbay
Spinyplatyceras spinosa (FOSSIL) (G.A. Goldfuss, 1844 †)
Platyceras spirale (FOSSIL) J.W. Hall, 1859 † Canada, Quebec, Cap-des-Rosiers
Platyostoma spirata (FOSSIL) (de Sowerby& Murchison, 1839 †) Sweden, Gotland
Platyceras squamosus (FOSSIL) Trenkner, 1868 † UK, England, Torbay
Cyclonema statshiunaica (FOSSIL) Saladzius, 1966 †
Platyceras steinmanni (FOSSIL) A.H. Clarke, 1899 †
Turbonellina striata (FOSSIL) C. Gemmellaro, 1889 † Italy, Sicily, Palermo
Platyostoma strophius (FOSSIL) J.W. Hall, 1862 †
Naticellina suavis (FOSSIL) (J. Perner, 1907 †) Czech Republic, Beroun
Rhineoderma subcarbonaria (FOSSIL) Keyes, 1894 †
Platyceras subcirculare (FOSSIL) Kindle † Indiana
Platyceras subelegans (FOSSIL) Girty, 1910 † USA, Oklahoma, Muskogee
Platyostoma subglobosa (FOSSIL) Stauffer, 1909 † USA, Ohio, Union
Cyclonema sublaeve (FOSSIL) Ulrich & Scofield, 1897 † Minnesota
Platyceras subrotundum (FOSSIL) Snider, 1915 † USA, Illinois, Johnson
Platyceras subumbonatum (FOSSIL) Northrop, 1939 †
Cyclonema subundata (FOSSIL) Northrop, 1939 †
Cyclonema sulcifera (FOSSIL) d'Eichwald, 1856 † Norway, Telemark, Skien
Cyclonema sulphuriferum (FOSSIL) J. Perner, 1903 †
Cyclonema supralirata (FOSSIL) Rohr & Smith, 1978 †
Platyceras symmetricum (FOSSIL) J.W. Hall, 1862 † USA, Kentucky
Strophostylus tantillus (FOSSIL) W.J. Gordon& E.L. Yochelson, 1983 † United States, Nevada, White Pine
Visitator tennesseensis (FOSSIL) (Dunbar, 1920 †) Tennessee
Cyclonema tenuissimum (FOSSIL) Lindström, 1884 †
Platyceras terminalis (FOSSIL) (Whidborne, 1889 †) UK, Devon
Cyclonema textilis (FOSSIL) (Miller, 1897 †) USA, Iowa, Clinton
Cyclonema thalia (FOSSIL) Billings, 1857 † Canada, Quebec, Minganie-Basse-Cote-Nord
Platyceras thetis (FOSSIL) J.W. Hall, 1862 † USA, Ohio, Union
Cyclonema timidum (FOSSIL) J. Perner, 1903 † Czech Republic, StÅ™edoĨeský, Praha - západ
Cyclonema transversum (FOSSIL) Ulrich & Scofield, 1897 † Minnesota
Strophostylus transversus (FOSSIL) J.W. Hall, 1859 †
Cyclonema trepidans (FOSSIL) J. Perner, 1903 † Czech Republic, Prague
Platyostoma triangularis (FOSSIL) Talent & Philip, 1956 † Australia, Victoria, Wellington - Rosedale