| Species name | Common name | Distribution | Max. Length (cm) | 
|---|---|---|---|
| Caecum abreviatum Folin, 1870  | 
					Western Atlantic | 0.2 | |
| Caecum achirona (Folin, 1867)  | 
					Western Atlantic | 0.4 | |
| Caecum amedroglyptum Rehder, 1980  | 
					Southeast Pacific | 0.17 | |
| Caecum antillarum Carpenter, 1858  | 
					Antillean Caecum | Western Atlantic | 0.3 | 
| Caecum armoricum de Folin, 1869  | 
					Mediterranean Sea | ||
| Caecum attenuatum de Folin, 1880  | 
					Western and Eastern Central Pacific | ||
| Caecum auriculatum de Folin, 1868  | 
					Mediterranean Sea | ||
| Caecum bicinctum Folin, 1870  | 
					Western Atlantic | 0.18 | |
| Caecum bimamillatum Folin, 1867  | 
					Western Atlantic | 0.16 | |
| Caecum bipartitum de Folin, 1870  | 
					Bipartite Caecum | Western Central Atlantic | 0.2 | 
| Caecum brasilicum Folin, 1874  | 
					Western Atlantic | 0.4 | |
| Caecum breve de Folin, 1867  | 
					Western Atlantic | 0.12 | |
| Caecum californicum Dall, 1885  | 
					California Caecum | East Pacific | |
| Caecum carolinianum Dall, 1892  | 
					Carolina Caecum | Eastern Central Pacific and Western Central Atlantic | 0.475 | 
| Caecum caverna Moolenbeek, Faber & Iliffe, 1989  | 
					Western Atlantic | 0.28 | |
| Caecum chilense Stuardo, 1962  | 
					Southeast Pacific | 0.2 | |
| Caecum cinctum Olsson & Harbison, 1953  | 
					Western Central Atlantic | 0.28 | |
| Caecum circumvolutum de Folin, 1867  | 
					Western Atlantic | 0.18 | |
| Caecum clarkii Carpenter, 1859  | 
					Mediterranean Sea | ||
| Caecum clava de Folin, 1867  | 
					Club Caecum | Western Central Atlantic | 0.36 | 
| Caecum condylum Moore, 1969  | 
					Bone Caecum | Western Central Atlantic | 0.336 | 
| Caecum cooperi Smith, 1860  | 
					Cooper's Atlantic Caecum | Eastern Central Pacific and Western Central Atlantic | 0.61 | 
| Caecum cornucopiae (Carpenter, 1858)  | 
					Horn-of-plenty Caecum | North America | 0.2 | 
| Caecum costulatum Folin, 1870  | 
					Western Atlantic | ||
| Caecum crebricinctum Carpenter, 1864  | 
					Many-named Caecum | East Pacific | |
| Caecum crispum Verrill & Bush, 1900  | 
					Western Atlantic | 0.21 | |
| Caecum cycloferum de Folin, 1867  | 
					Fatlip Caecum | Western Atlantic | 0.6 | 
| Caecum debile Verrill & Bush, 1900  | 
					Western Atlantic | 0.24 | |
| Caecum delicatulum Verrill & Bush, 1900  | 
					Western Atlantic | 0.3 | |
| Caecum directum Vannozzi, 2019  | 
					Western Central Pacific | ||
| Caecum donmoorei Mitchell-Tapping, 1979  | 
					Western Atlantic | 0.14 | |
| Caecum eliezeri Absalao, 1997  | 
					Western Atlantic | 0.28 | |
| Caecum elongatum Folin, 1874  | 
					Western Atlantic | ||
| Caecum exile de Folin, 1880  | 
					Eastern Central Pacific | ||
| Caecum floridanum Stimpson, 1851  | 
					Florida Caecum | Western Central Atlantic | 0.56 | 
| Caecum frugi Vannozzi, 2019  | 
					Western Central Pacific | ||
| Caecum gibbesii Kurtz, 1860  | 
					Western Atlantic | ||
| Caecum glabriforme Carpenter, 1857  | 
					Eastern Central Pacific | ||
| Caecum glabrum Montagu, 1803  | 
					Northeast Atlantic and the Mediterranean Sea | ||
| Caecum granulatum Vannozzi, 2019  | 
					Western Central Pacific | ||
| Caecum gulosum Hedley, 1899  | 
					Western and Eastern Central Pacific | ||
| Caecum gurgulio Carpenter, 1858  | 
					Windpipe Caecum | North America | 0.2 | 
| Caecum heladum Olsson & Harbison, 1953  | 
					Fine-line Caecum | Western Central Atlantic | |
| Caecum hemisphericum Folin, 1867  | 
					Western Atlantic | ||
| Caecum imbricatum Carpenter, 1858  | 
					Imbricate Caecum | Western Atlantic | 0.31 | 
| Caecum infimum Folin, 1867  | 
					Western Atlantic | 0.12 | |
| Caecum insularum Moore, 1969  | 
					Western Atlantic | 0.34 | |
| Caecum johnsoni Winkley, 1908  | 
					Johnson's Caecum | Eastern Central Pacific and Western Atlantic | 0.45 | 
| Caecum jonatani Espinosa, Ortea & Fernández-Garcés, 2007  | 
					Western Atlantic | 0.31 | |
| Caecum jucundum Folin, 1867  | 
					Western Atlantic | 0.32 | |
| Caecum leve Folin, 1870  | 
					Western Atlantic | ||
| Caecum limpidum Folin, 1874  | 
					Western Atlantic | 0.2 | |
| Caecum lineicinctum de Folin, 1880  | 
					Western Central Atlantic | 0.325 | |
| Caecum maori Pizzini & Raines, 2006  | 
					Southwest Pacific | ||
| Caecum massambabense Absalao, 1994  | 
					Western Atlantic | 0.7 | |
| Caecum multicostatum Folin, 1867  | 
					Western Atlantic | 0.24 | |
| Caecum nasutum Vannozzi, 2019  | 
					Western Central Pacific | ||
| Caecum neocaledonicum de Folin, 1868  | 
					Eastern Central Pacific | ||
| Caecum neoguineanum Vannozzi, 2019  | 
					Western Central Pacific | ||
| Caecum nofronii Vannozzi, 2019  | 
					Western Central Pacific | ||
| Caecum oahuense Pilsbry, 1921  | 
					Eastern Central Pacific | ||
| Caecum occidentale (Bartsch, 1920)  | 
					Western Caecum | East Pacific | |
| Caecum planum Folin, 1874  | 
					Western Atlantic | 0.2 | |
| Caecum plicatum Carpenter, 1858  | 
					Plicate Caecum | Western Atlantic | 0.4 | 
| Caecum pulchellum Stimpson, 1851  | 
					Beautiful Caecum | Eastern Central Pacific and Western Atlantic | 0.45 | 
| Caecum rapanuiense Raines & Pizzini, 2005  | 
					Southeast Pacific | ||
| Caecum regulare Carpenter, 1858  | 
					Western Central Atlantic | 0.25 | |
| Caecum rijgersmai Jong & Coomans, 1988  | 
					Western Atlantic | 0.25 | |
| Caecum rostratum de Folin, 1881  | 
					Eastern Central Pacific | ||
| Caecum ryssotitum de Folin, 1867  | 
					Minute Caecum | Western Atlantic | 0.23 | 
| Caecum sepimentum de Folin, 1868  | 
					Eastern Central Pacific | ||
| Caecum someri (Folin, 1867)  | 
					Western Atlantic | 0.26 | |
| Caecum striatum Folin, 1868  | 
					Western Atlantic | 0.2 | |
| Caecum strictum Folin, 1871  | 
					Western Atlantic | 0.2 | |
| Caecum strigosum de Folin, 1868  | 
					Western Atlantic | 0.21 | |
| Caecum subannulatum de Folin, 1870  | 
					Mediterranean Sea | ||
| Caecum subornatum Folin, 1874  | 
					Western Atlantic | 0.24 | |
| Caecum subvolutum de Folin, 1874  | 
					Western Central Atlantic | 0.36 | |
| Caecum taeniatum Folin, 1869  | 
					Western Atlantic | ||
| Caecum tenue Verrill & Bush, 1900  | 
					Western Atlantic | 0.16 | |
| Caecum tenuicostatum Folin, 1881  | 
					Western Atlantic | 0.35 | |
| Caecum textile de Folin, 1867  | 
					Textile Caecum | Western Central Atlantic | 0.22 | 
| Caecum tinctum Folin, 1869  | 
					Western Atlantic | ||
| Caecum tornatum Verrill & Bush, 1900  | 
					Western Atlantic | 0.33 | |
| Caecum torquetum Folin, 1867  | 
					Western Atlantic | 0.25 | |
| Caecum tortile Dall, 1892  | 
					Twisted Caecum | North America | 0.612 | 
| Caecum trachea (Montagu, 1803)  | 
					Mediterranean Sea | ||
| Caecum troglodyta Moolenbeek, Faber & Iliffe, 1989  | 
					Western Atlantic | 0.28 | |
| Caecum variegatum de Folin, 1867  | 
					Northwest Pacific | ||
| Caecum venosum Folin, 1867  | 
					Western Atlantic | 0.13 | |
| Caecum vertebrale Hedley, 1899  | 
					Western and Eastern Central Pacific | ||
| Caecum vestitum de Folin, 1868  | 
					Vera cruz Caecum | Western Central Atlantic | |
| Caecum zaagmani Jong & Coomans, 1988  | 
					Western Atlantic | 0.18 | |
| Caecum zonulatum Folin, 1869  | 
					Western Atlantic |