Seymourites abruptus (FOSSIL) McLearn, 1929 †
Spinikosmoceras aculeatum (FOSSIL) (K.E.I. von Eichwald,1893 †)
Spinikosmoceras acutistriatum (FOSSIL) Robson †
Gulielmiceras alaskanum (FOSSIL) Imlay, 1953 †
Seymourites alticostatus (FOSSIL) Imlay, 1953 †
Kosmoceras bigoti (FOSSIL) R. Douvillé, 1915 †
Sigaloceras calloviense (FOSSIL) (J. de C. Sowerby,1815 †)
Kosmoceras castor (FOSSIL) Reinecke, 1818 †
Kosmoceras castor bizeti (FOSSIL) J.H.F. Douvillé, 1915 †
Kepplerites curtilobus (FOSSIL) (Buckman, 1922 †)
Kosmoceras duncani (FOSSIL) Sowerby, 1816 †
Kosmoceras effulgens (FOSSIL) (Buckman) †
Kepplerites enodatum (FOSSIL) (Nikitin, 1881 †)
Kosmoceras fibuliferum (FOSSIL) (Buckman, 1924 †)
Kepplerites galilaei (FOSSIL) (Buckman, 1922 †)
Kosmoceras gemmatum (FOSSIL) B. Phillips, 1835 †
Seymourites gitinsi (FOSSIL) McLearn, 1927 †
Kepplerites gowerianus (FOSSIL) (Sowerby 1827 †)
Seymourites ingrahami (FOSSIL) McLearn, 1929 †
Gulielmiceras jason (FOSSIL) (Reinecke, 1818 †)
Kepplerites keppleri (FOSSIL) (Oppel, 1862 †)
Kosmoceras lithuanicum (FOSSIL) (Siemiradski, 1864 †)
Seymourites mcevoyi (FOSSIL) McLearn, 1928 †
Seymourites multus (FOSSIL) McLearn, 1929 †
Zugokosmoceras obductum (FOSSIL) Buckman, 1925 †
Kosmoceras ornatum (FOSSIL) Schlotheim, 1820 †
Kosmoceras phaeinum (FOSSIL) (Buckman, 1924 †)
Catasigaloceras planicerclus (FOSSIL) (Buckman †)
Seymourites plenus (FOSSIL) McLearn, 1927 †
Kosmoceras proniae (FOSSIL) (Teysserre 1883 †)
Gowericeras snugharborense (FOSSIL) Imlay, 1953 †
Kosmoceras spiculatum (FOSSIL) (Buckman, 1924 †)
Gowericeras spinosum (FOSSIL) Imlay, 1953 †
Kosmoceras spinosum (FOSSIL) Sowerby, 1826 †
Kosmoceras spoliatum (FOSSIL) F.A. von Quenstedt,1858 †