Parastrophia melanesiana M. Pizzini, B.K. Raines& A. Vannozzi, 2013
Caecum metamorphosicum S.F.B. de Lima, F.N. Santos& R.S. Absalão, 2013
Caecum mexicanum (FOSSIL) Collins, 1937 †
Caecum microcyclus L. de Folin, 1879
Caecum microstriatum M. Pizzini, B.K. Raines& A. Vannozzi, 2013
Caecum mineuri (FOSSIL) P. Lozouet, 1999 †
Cornuoides minor T. Brown, 1827
Caecum minutum L. de Folin, 1867
Caecum mirabile L. de Folin, 1867
Caecum mirificum L. de Folin, 1867
Caecum modestum L. de Folin, 1868
Caecum monstrosum C.B. Adams, 1852
Caecum moorei L.N. Marincovich, 1973
Caecum morgan A. Vannozzi, M. Pizzini& B.K. Raines, 2015
Caecum multicostatum L. de Folin, 1867
Caecum musorstomi M. Pizzini, B.K. Raines& A. Vannozzi, 2013
Caecum mutabile L. de Folin, 1869
Caecum nemoralis P. Lozouet, 2015
Caecum neocaledonicum L. de Folin, 1867
Meioceras nitidum (W. Stimpson, 1851)
Caecum oahuense H.A. Pilsbry, 1921
Caecum obtusum P.P. Carpenter, 1857
Caecum occidentale (P. Bartsch, 1920)
Caecum occultum L. de Folin, 1867
Caecum orcutti W.H. Dall, 1885
Parastrophia ornata A. Vannozzi, M. Pizzini& B.K. Raines, 2015
Caecum paradoxum L. de Folin, 1867
Caecum parvulum L. de Folin, 1867
Caecum parvum C.B. Adams, 1852
Caecum pascuanum B.K. Raines & M. Pizzini,2005
Caecum patuxentium (FOSSIL) Martin, 1904 †
Fartulum pertenuis (FOSSIL) C.R. Laws, 1941 †
Strebloceras pizzinii Vannozzi, 2016
Caecum planum L. de Folin, 1874
Caecum plicatum Carpenter, 1858