Caecum obtusum P.P. Carpenter, 1857 Mexico, Mazatlan
Caecum occidentale (P. Bartsch, 1920) USA, Washington2,2 mm
Caecum occultum L. de Folin, 1867 Panama, Las Perlas Islands
Caecum orcutti W.H. Dall, 1885 Japan, Wakayama1,8 mm
Caecum paradoxum L. de Folin, 1867 Panama, Las Perlas Islands
Caecum parvulum L. de Folin, 1867 Panama, Las Perlas Islands
Caecum parvum C.B. Adams, 1852 Mexico, Nayarit
Caecum pascuanum B.K. Raines & M. Pizzini,2005 Easter Island
Caecum patuxentium (FOSSIL) Martin, 1904 † USA, Maryland, Talbot
Caecum planum L. de Folin, 1874 North Brazil
Caecum plicatum Carpenter, 1858 Florida, Miami County4 mm
Caecum pollicare P.P. Carpenter, 1859 Canary Islands1,4 mm
Caecum profundicolum P. Bartsch, 1920
Caecum properegulare (FOSSIL) W.C. Mansfield, 1925 † Trinidad and Tobago
Caecum pulchellum W. Stimpson, 1851 USA, Maine4 mm
Caecum pygmaeum C.B. Adams, 1852 Panama
Caecum quadratum P.P. Carpenter, 1857 Galapagos
Caecum rapanuiense B.K. Raines & M. Pizzini,2005 Easter Island
Caecum regulare Carpenter, 1858 Bahamas
Caecum rehderi B.K. Raines & M. Pizzini,2005 Easter Island
Caecum reversum P.P. Carpenter, 1857 West Panama
Caecum richthofeni A.M. Strong& L.G. Hertlein, 1939 Galapagos
Caecum rijgersmai D. De Jong& H.E. Coomans, 1988 Curaçao Island
Caecum rolani M. Pizzini & I. Nofroni,2001 Canary Islands
Caecum rosanum P. Bartsch, 1920 West Mexico
Caecum rostratum L. de Folin, 1881 French Polynesia, Topatii
Caecum ryssotitum L. de Folin, 1867 Bahamas
Caecum searleswoodii P.P. Carpenter, 1859 Canary Islands1,6 mm
Caecum semicinctum L. de Folin, 1867 Panama
Caecum semilaeve P.P. Carpenter, 1857 Mexico, Sonora
Caecum senegambianum L. de Folin, 1870 Senegal, Dakar
Caecum sepimentum L. de Folin, 1868 Hawaii2,1 mm
Caecum sinuatum L. de Folin, 1867
Caecum skoglundae M. Pizzini, B.K. Raines& I. Nofroni, 2007 West Panama3 mm
Caecum smriglioi M. Pizzini, I. Nofroni& A. Bonfitto, 2008 Sri Lanka4 mm