Probolaeum canadense (FOSSIL) A.H. Clarke, 1908 †
Septemchiton grayiae (FOSSIL) (Woodward, 1885 †)
Sarkachiton kielcensis (FOSSIL) Dzik, 1994 †
Hawthorneachiton lowenstami (FOSSIL) Kluessendorf, 1987 †
Septemchiton vermiformis (FOSSIL) J.R.M. Bergenhayn, 1955 †