Caecum pollicare P.P. Carpenter, 1859
Caecum profundicolum P. Bartsch, 1920
Caecum properegulare (FOSSIL) W.C. Mansfield, 1925 †
Caecum pulchellum W. Stimpson, 1851
Parastrophia pulcherrima M. Pizzini, B.K. Raines& A. Vannozzi, 2013
Defolinia putnamensis (FOSSIL) (W.C. Mansfield, 1924 †)
Caecum pygmaeum C.B. Adams, 1852
Caecum quadratum P.P. Carpenter, 1857
Parastrophia queenslandica (T. Iredale & C.F. Laseron,1957)
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
Meioceras rhinoceros M. Pizzini, B.K. Raines& A. Vannozzi, 2013
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
Meioceras sandwichense L. de Folin, 1881
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
Jayella serrata T. Iredale & C.F. Laseron,1957
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)
Caecum strangulatum L. de Folin, 1867
Caecum striatum L. de Folin, 1868
Ctiloceras striatum C. Hedley, 1902
Caecum strictum L. de Folin, 1871