Caecum occidentale (P. Bartsch, 1920)
Caecum occultum L. de Folin, 1867
Caecum orcutti W.H. Dall, 1885
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 †
Caecum planum L. de Folin, 1874
Caecum plicatum Carpenter, 1858
Caecum pollicare P.P. Carpenter, 1859
Caecum profundicolum P. Bartsch, 1920
Caecum properegulare (FOSSIL) W.C. Mansfield, 1925 †
Caecum pulchellum W. Stimpson, 1851
Caecum pygmaeum C.B. Adams, 1852
Caecum quadratum P.P. Carpenter, 1857
Caecum rapanuiense B.K. Raines & M. Pizzini,2005
Caecum regulare Carpenter, 1858
Caecum rehderi B.K. Raines & M. Pizzini,2005
Caecum reversum P.P. Carpenter, 1857
Caecum richthofeni A.M. Strong & L.G. Hertlein,1939
Caecum rijgersmai D. De Jong & H.E. Coomans,1988
Caecum rolani M. Pizzini & I. Nofroni,2001
Caecum rosanum P. Bartsch, 1920
Caecum rostratum L. de Folin, 1881
Caecum ryssotitum L. de Folin, 1867
Caecum searleswoodii P.P. Carpenter, 1859
Caecum semicinctum L. de Folin, 1867
Caecum semilaeve P.P. Carpenter, 1857
Caecum senegambianum L. de Folin, 1870
Caecum sepimentum L. de Folin, 1868
Caecum sinuatum L. de Folin, 1867
Caecum skoglundae M. Pizzini, B.K. Raines& I. Nofroni, 2007
Caecum smriglioi M. Pizzini, I. Nofroni& A. Bonfitto, 2008
Caecum someri (L. de Folin, 1867)