Carydium bellastriatum (FOSSIL) (T.A. Conrad, 1841 †) USA, Pennsylvania, Perry
Carydium clarkei (FOSSIL) Bailey, 1986 † United States, New York, Orange
Carydium globularis (FOSSIL) (J.W. Hall, 1885 †) United States, New York, Chautauqua
Carydium manitobensis (FOSSIL) (J.J.F. Whiteaves,1892 †)
Carydium sociale (FOSSIL) (Beushausen, 1895 †) UK, England, Devon
Carydium varicosum (FOSSIL) (J.W. Hall& R.P. Whitfield, 1869 †) New York, Cayuga County