Caecum farcimen P.P. Carpenter, 1857
Caecum fibratum (FOSSIL) L. de Folin & F. Bèrillon,1874 †
Caecum fijiense M. Pizzini, B.K. Raines& A. Vannozzi, 2013
Caecum firmatum C.B. Adams, 1852
Defolinia flemingi (FOSSIL) (Gardner & T.H. Aldrich,1919 †)
Caecum floridanum W. Stimpson, 1851
Caecum folini B.S. Kisch, 1959
Caecum geigeri M. Pizzini & B.K. Raines,2011
Caecum glabellum (A. Adams, 1868)
Caecum glabriforme P.P. Carpenter, 1857
Caecum glabrum (G. Montagu, 1803)
Caecum gofasi M. Pizzini & I. Nofroni,2001
Caecum gracile A.A. Gould, 1861
Caecum greensboroense (FOSSIL) Martin, 1904 †
Caecum gulosum C. Hedley, 1899
Caecum gurgulio P.P. Carpenter, 1858
Caecum hemisphericum L. de Folin, 1867
Caecum heptagonum P.P. Carpenter, 1857
Caecum heterochromum B.K. Raines & M. Pizzini,2005
Strebloceras hinemoa Finlay, 1931
Caecum imbricatum Carpenter, 1858
Caecum impartitum L. de Folin, 1867
Caecum impartitum bicolor L. de Folin, 1867
Caecum imperfectum L. de Folin, 1867
Caecum incisum A. Vannozzi, M. Pizzini& B.K. Raines, 2015
Caecum inclinatum L. de Folin, 1869
Caecum infimum L. de Folin, 1867
Caecum inflatum L. de Folin, 1869
Caecum inhacaense P.G. Albano & M. Pizzini,2011
Caecum insculptum P.P. Carpenter, 1857
Caecum insularum R.C. Moore, 1969
Caecum interruptum L. de Folin, 1867
Caecum intortum A. Vannozzi, M. Pizzini& B.K. Raines, 2015
Caecum irregulare L. de Folin, 1867
Parastrophia japonica Hinoide & T. Habe, 1978