Vanuxemia limbata (FOSSIL) W.J. Raymond, 1905 †
Cyrtodonta lindstromi (FOSSIL) Isberg, 1934 †
Vanuxemia media (FOSSIL) Ulrich, 1894 †
Cyrtodontula megambona (FOSSIL) (R.P. Whitfield, 1877 †)
Cyrtodonta megumbona (FOSSIL) Isberg, 1934 †
Heikea megumbona (FOSSIL) Isberg, 1934 †
Cyrtodonta mira (FOSSIL) Isberg, 1934 †
Cyrtodonta mobergi (FOSSIL) Isberg, 1934 †
Macrodesma modesta (FOSSIL) Isberg, 1934 †
Vanuxemia niota (FOSSIL) J.W. Hall †
Heikea nux (FOSSIL) Isberg, 1934 †
Cyrtodonta obesa (FOSSIL) Ulrich, 1894 †
Cyrtodonta obliqua (FOSSIL) F.B. Meek & A.H. Worthen †,
Cyrtodontula obliquata (FOSSIL) (Ulrich, 1890 †)
Heikea oblonga (FOSSIL) Isberg, 1934 †
Cyrtodonta oboloidea (FOSSIL) (Hicks, 1873 †)
Vanuxemia obtusifrons (FOSSIL) (Ulrich, 1894 †)
Vanuxemia odhneri (FOSSIL) Isberg, 1934 †
Cyrtodonta orsae (FOSSIL) Isberg, 1934 †
Cyrtodonta ovalis (FOSSIL) Foerste, 1924 †
Heikea ovata (FOSSIL) Isberg, 1934 †
Cyrtodonta oviformis (FOSSIL) Ulrich, 1894 †
Warburgia oviformis (FOSSIL) Isberg, 1934 †
Pharcidoconcha parallela (FOSSIL) (Hsü & X.T. Ma, 1948 †)
Cyrtodontula parksi (FOSSIL) (C.C. Stewart, 1920 †)
Cyrtodonta parva (FOSSIL) Ulrich, 1894 †
Heikea parva (FOSSIL) Isberg, 1934 †
Cyrtodonta persimilis (FOSSIL) Ulrich, 1894 †
Dickinsartella pistacina (FOSSIL) Larghi, 2005 †
Heikea plana (FOSSIL) Isberg, 1934 †
Cyrtodontula plebia (FOSSIL) (Billings, 1866 †)
Cyrtodonta ponderosa (FOSSIL) Billings, 1865 †
Cyrtodontula praecipta (FOSSIL) (Ulrich, 1890 †)
Heikea preciosa (FOSSIL) Isberg, 1934 †
Cyrtodonta prima (FOSSIL) Kobayashi, 1934 †