Amphelissa carinatum (FOSSIL) Heidecker, 1959 †
Amphelissa isisensis (FOSSIL) R. Etheridge jr., 1921 †
Boucotspira antelopensis (FOSSIL) (Rohr, 1996 †)
Boucotspira carinifer (FOSSIL) (E.F.R.K. Koken, 1896 †)
Boucotspira fimbriata (FOSSIL) Rohr, 1980 †
Boucotspira lamellosa (FOSSIL) (Lindström, 1884 †)
Boucotspira ordovicia (FOSSIL) (Longst, 1924 †)
Boucotspira ozawai (FOSSIL) (O. Kobayashi, 1930 †)
Boucotspira visbeyensis (FOSSIL) (Lindstrom, 1884 †)
Boucotspira wisbyensis (FOSSIL) (Lindström, 1884 †)
Burdikinia axionoides (FOSSIL) (R. Etheridge jr.,1921 †)
Burdikinia burdekinensis (FOSSIL) (R. Etheridge jr.,1917 †)
Helicotoma blodgetti (FOSSIL) Rohr, 1988 †
Helicotoma brocki (FOSSIL) Foerste, 1912 †
Helicotoma declivis (FOSSIL) Safford, 1869 †
Helicotoma gorgonea (FOSSIL) Billings, 1865 †
Helicotoma granosa (FOSSIL) Ulrich & Scofield, 1897 †
Helicotoma griffinorum (FOSSIL) Rohr, 1980 †
Helicotoma kanekoi (FOSSIL) T. Kobayashi, 1931 †
Helicotoma marginata (FOSSIL) Ulrich & Scofield, 1897 †
Helicotoma miser (FOSSIL) Billings, 1865 †
Helicotoma missouriensis (FOSSIL) R.M. Branson, 1909 †
Helicotoma oriens (FOSSIL) J. Perner, 1903 †
Helicotoma patula (FOSSIL) Lamont †
Helicotoma planulata (FOSSIL) Salter, 1859 †
Helicotoma planulatoides (FOSSIL) Ulrich & Scofield, 1897 †
Helicotoma proserpina (FOSSIL) Billings, 1865 †
Helicotoma robinsoni (FOSSIL) Rohr, 1988 †
Helicotoma robusta (FOSSIL) Ulrich & Scofield, 1897 †
Helicotoma similis (FOSSIL) R.P. Whitfield, 1890 †
Helicotoma subquadrata (FOSSIL) Ulrich & Scofield, 1897 †
Helicotoma superba (FOSSIL) E.F.R.K. Koken, 1897 †
Helicotoma tennesseensis (FOSSIL) Safford, 1869 †
Helicotoma tritonia (FOSSIL) Billings, 1865 †
Helicotoma umbilicata (FOSSIL) Ulrich & Scofield, 1897 †
Helicotoma verticalis (FOSSIL) Ulrich & Scofield, 1897 †
Helicotoma whiteavesiana (FOSSIL) W.J. Raymond, 1908 †