Carydium bellastriatum (FOSSIL) (T.A. Conrad, 1841 †)
Carydium clarkei (FOSSIL) Bailey, 1986 †
Carydium globularis (FOSSIL) (J.W. Hall, 1885 †)
Carydium manitobensis (FOSSIL) (J.J.F. Whiteaves,1892 †)
Carydium sociale (FOSSIL) (Beushausen, 1895 †)
Carydium varicosum (FOSSIL) (J.W. Hall& R.P. Whitfield, 1869 †)