• Amphiperas (Simnia) Risso, 1826 accepted as Simnia Risso, 1826
• Amphiperas (Simnia) aureocincta Dall, 1889 accepted as Cyphoma aureocinctum (Dall, 1889)
• Amphiperas (Simnia) piragua Dall, 1889 accepted as Calcarovula piragua (Dall, 1889)
• Ovula (Simnia) Risso, 1826 accepted as Simnia Risso, 1826
• Ovula (Simnia) deflexa (G. B. Sowerby II, 1849) accepted as Naviculavolva deflexa (G. B. Sowerby II, 1849)
• Ovula (Simnia) deflexa var. barbarensis Dall, 1892 accepted as Neosimnia barbarensis (Dall, 1892) accepted as Simnia barbarensis (Dall, 1892)
• Ovula (Simnia) subtruncata C. W. Johnson, 1899 † (uncertain > unassessed)
• Ovula (Simnia) texana C. W. Johnson, 1899 † (uncertain > unassessed)
• Simnia Risso, 1826
• Simnia (Neosimnia) P. Fischer, 1884 accepted as Simnia Risso, 1826
• Simnia (Neosimnia) aureocincta Dall, 1899 accepted as Cyphoma aureocinctum (Dall, 1889)
• Simnia (Neosimnia) exigua Tate, 1890 † accepted as Pellasimnia exigua (Tate, 1890) † accepted as Phenacovolva exigua (Tate, 1890) †
• Simnia (Neosimnia) illyrica F. A. Schilder, 1927 accepted as Simnia illyrica F. A. Schilder, 1927 accepted as Simnia spelta (Linnaeus, 1758)
• Simnia (Neosimnia) lhommei (Cossmann, 1907) † accepted as Sandalia vibrayana (de Raincourt, 1870) †
• Simnia (Neosimnia) rostralina (Deshayes, 1865) † accepted as Simnia rostralina (Deshayes, 1865) †
• Simnia (Neosimnia) spelta (Linnaeus, 1758) accepted as Neosimnia spelta (Linnaeus, 1758) accepted as Simnia spelta (Linnaeus, 1758)
• Simnia (Neosimnia) spelta illyrica Coen, 1949 (uncertain > taxon inquirendum)
• Simnia (Neosimnia) spelta var. brevis Coen, 1949 (uncertain > taxon inquirendum)
• Simnia (Neosimnia) vibrayana (de Raincourt, 1870) † accepted as Sandalia vibrayana (de Raincourt, 1870) †
• Simnia (Prosimnia) F. A. Schilder, 1927 accepted as Prosimnia F. A. Schilder, 1927
• Simnia (Simnialena) C. N. Cate, 1973 accepted as Simnialena C. N. Cate, 1973
• Simnia (Simnialena) oryzagrana Dolin, 1991 † accepted as Simnialena uniplicata (G. B. Sowerby II, 1849)
• Simnia acicularis (Lamarck, 1811) accepted as Cymbovula acicularis (Lamarck, 1810)
• Simnia aequalis (G. B. Sowerby I, 1832) accepted as Neosimnia avena (G. B. Sowerby I, 1833) accepted as Simnia avena (G. B. Sowerby I, 1833)
• Simnia aperta (G. B. Sowerby II, 1849) accepted as Xandarovula aperta (G. B. Sowerby II, 1849)
• Simnia arcuata (Reeve, 1865)
• Simnia aureocincta Dall, 1899 accepted as Cyphoma aureocinctum (Dall, 1889)
• Simnia avena (G. B. Sowerby I, 1833)
• Simnia barbarensis (Dall, 1892)
• Simnia bartschi (C. N. Cate, 1973)
• Simnia bijuri (C. N. Cate, 1976)
• Simnia brevicula (Celzard & Dovesi, 2024) †
• Simnia brevirostris (Schumacher, 1817) accepted as Phenacovolva brevirostris (Schumacher, 1817)
• Simnia fusulina Dolin & Lozouet, 2004 †
• Simnia graniformis (Celzard & Dovesi, 2024) †
• Simnia hammesi (Bertsch & Bibbey, 1982)
• Simnia helenae Dolin & Lozouet, 2004 †
• Simnia hiscocki Lorenz & Melaun, 2011 accepted as Xandarovula hiscocki (Lorenz & Melaun, 2011)
• Simnia hyalina Lorenz & Fehse, 2009 accepted as Xandarovula hyalina (Lorenz & Fehse, 2009)
• Simnia illyrica F. A. Schilder, 1927 accepted as Simnia spelta (Linnaeus, 1758)
• Simnia inflexa (G. B. Sowerby I, 1832) accepted as Simnialena rufa (G. B. Sowerby I, 1833)
• Simnia inflexa (G. B. Sowerby I, 1832) sensu F. A. Schilder, 1941 accepted as Simnialena rufa (G. B. Sowerby I, 1833)
• Simnia jacintoi Fehse & Trigo, 2015 accepted as Xandarovula jacintoi (Fehse & Trigo, 2015)
• Simnia leathesi (J. de C. Sowerby, 1826) †
• Simnia lhommei (Cossmann, 1907) † accepted as Sandalia vibrayana (de Raincourt, 1870) †
• Simnia limondinae Dolin & Lozouet, 2004 †
• Simnia loebbeckeana (Weinkauff, 1881)
• Simnia macleani (C. N. Cate, 1976)
• Simnia multilineata (Celzard & Dovesi, 2024) †
• Simnia nicaeensis Risso, 1826 accepted as Simnia spelta (Linnaeus, 1758)
• Simnia nicaoensis [sic] accepted as Simnia nicaeensis Risso, 1826 accepted as Simnia spelta (Linnaeus, 1758)
• Simnia patula (Pennant, 1777) accepted as Xandarovula patula (Pennant, 1777)
• Simnia piragua (Dall, 1889) accepted as Calcarovula piragua (Dall, 1889)
• Simnia pliomajor (Sacco, 1894)
• Simnia pseudolaevis (Celzard & Dovesi, 2024) †
• Simnia pulchra (Celzard & Dovesi, 2024) †
• Simnia purpurea Risso, 1826 (uncertain > nomen dubium)
• Simnia quaylei H. N. Lowe, 1935
• Simnia rostralina (Deshayes, 1865) †
• Simnia rufa (G. B. Sowerby I, 1832) accepted as Simnialena rufa (G. B. Sowerby I, 1833)
• Simnia rufa var. inflexa (G. B. Sowerby I, 1833) sensu C. N. Cate, 1969 accepted as Neosimnia avena (G. B. Sowerby I, 1833) accepted as Simnia avena (G. B. Sowerby I, 1833)
• Simnia scobina (Garvie, 1996) †
• Simnia sculptura (C. N. Cate, 1973)
• Simnia semen (Defrance, 1825) †
• Simnia senegalensis (F. A. Schilder, 1931)
• Simnia sowerbyana (Weinkauff, 1881) accepted as Phenacovolva brevirostris (Schumacher, 1817)
• Simnia spelta (Linnaeus, 1758)
• Simnia spelta var. brevis Coen, 1949 accepted as Simnia spelta (Linnaeus, 1758)
• Simnia uniplicata (G. B. Sowerby II, 1849) accepted as Simnialena uniplicata (G. B. Sowerby II, 1849)
• Simnia vibrayana (de Raincourt, 1870) † accepted as Sandalia vibrayana (de Raincourt, 1870) †
• Simnia vidleri (G. B. Sowerby III, 1881) accepted as Simnia arcuata (Reeve, 1865)
• Simnia wisewoodae (Maury, 1917) †
• Simnia xanthochila Kuroda, 1929 accepted as Contrasimnia xanthochila (Kuroda, 1928)
• Simnialena C. N. Cate, 1973
• Simnialena acuminata (G. B. Sowerby II, 1848)
• Simnialena formicaria (G. B. Sowerby I, 1828)
• Simnialena ilhabelaensis Fehse, 2001
• Simnialena inflexa (G. B. Sowerby I, 1832) accepted as Simnialena rufa (G. B. Sowerby I, 1833)
• Simnialena marferula C. N. Cate, 1973 accepted as Simnialena uniplicata (G. B. Sowerby II, 1849)
• Simnialena oryzograna Dolin, 1991 †
• Simnialena paita Fehse, 2017
• Simnialena regularoidea (Aldrich, 1921) †
• Simnialena rufa (G. B. Sowerby I, 1833)
• Simnialena uniplicata (G. B. Sowerby II, 1849)