Simnia regularoidea T.H. Aldrich 1921
Simnia rostralina (FOSSIL) G.P. Deshayes, 1865 †
Simnia rufa G.B. II Sowerby, 1832
Simnia scobina Garvie 1996
Simnia sculptura (C.N. Cate, 1973)
Simnia semen (FOSSIL) (J.L.M. Defrance, 1825 †)
Simnia senegalensis (F.A. Schilder, 1931)
Simnia spelta (C. Linnaeus, 1758)
Simnia spelta illyrica F.A. Schilder, 1927
Simnia spelta miocaenica (FOSSIL) (F. Sacco, 1894 ) †
Simnia spelta scaldisia (FOSSIL) Schilder, 1933 †
Simnia subtruncata Johnson, 1899
Simnia texana Johnson, 1899
Simnia winifredae (FOSSIL) Gibson-Smith, 1974 †
Simnia wisewoodae (FOSSIL) C.J. Maury, 1917 †
Simnialena acuminata (G.B. II Sowerby in A. Adams& L.A. Reeve, 1848)
Simnialena ilhabelaensis D. Fehse, 2001
Simnialena marferula C.N. Cate, 1973
Simnialena oryzagrana (FOSSIL) L. Dolin, 1991 †
Simnialena paita Fehse, 2017
Simnialena uniplicata (G.B. II Sowerby, 1849)