| Nominal Species (n = 156) | Present allocation (n = 104) | Ref. |
|---|---|---|
| Caecum abreviatum Folin, 1870 | Caecum abreviatum | 83435 |
| Brochina achirona Folin, 1867 | Caecum achirona | 83435 |
| Caecum amedroglyptum Rehder, 1980 | Caecum amedroglyptum | 3477 |
| Caecum antillarum Carpenter, 1858 | Caecum antillarum | 19 |
| Caecum arcuatum de Folin, 1869 | Caecum sepimentum | 3477 |
| Caecum armoricum de Folin, 1869 | Caecum armoricum | 1056 |
| Parastrophia asturiana de Folin, 1870 | Parastrophia asturiana | 1056 |
| Caecum attenuatum de Folin, 1880 | Caecum attenuatum | 3477 |
| Caecum auriculatum de Folin, 1868 | Caecum auriculatum | 1056 |
| Caecum bicinctum Folin, 1870 | Caecum bicinctum | 83435 |
| Caecum bimamillatum Folin, 1867 | Caecum bimamillatum | 83435 |
| Caecum biminicola Pilsbry, 1951 | Caecum plicatum | 75097 |
| Caecum bipartitum de Folin, 1870 | Caecum bipartitum | 19 |
| Caecum bitumidum Folin, 1869 | Meioceras nitidum | 75097 |
| Caecum brasilicum Folin, 1874 | Caecum brasilicum | 83435 |
| Caecum breve de Folin, 1867 | Caecum breve | 19 |
| Caecum buccina Folin, 1870 | Caecum vestitum | 75097 |
| Caecum californicum Dall, 1885 | Caecum californicum | 19 |
| Caecum capitanum Folin, 1874 | Caecum pulchellum | 75097 |
| Caecum carolinianum Dall, 1892 | Caecum carolinianum | 19 |
| Caecum caverna Moolenbeek, Faber & Iliffe, 1989 | Caecum caverna | 83435 |
| Caecum cayosense Rehder, 1943 | Caecum floridanum | 75097 |
| Caecum chilense Stuardo, 1962 | Caecum chilense | 92410 |
| Caecum cinctum Olsson & Harbison, 1953 | Caecum cinctum | 83435 |
| Caecum cingulatum Dall, 1892 | Meioceras nitidum | 75097 |
| Caecum circumvolutum de Folin, 1867 | Caecum circumvolutum | 3477 |
| Caecum clarkii Carpenter, 1859 | Caecum clarkii | 1056 |
| Caecum clava de Folin, 1867 | Caecum clava | 19 |
| Caecum clenchi Olsson & McGinty, 1958 | Caecum cycloferum | 75097 |
| Caecum condylum Moore, 1969 | Caecum condylum | 19 |
| Caecum conjunctum Folin, 1867 | Caecum pulchellum | 75097 |
| Caecum constrictum Gabb, 1873 | Meioceras nitidum | 75097 |
| Caecum contractum Folin, 1874 | Meioceras nitidum | 75097 |
| Caecum cooperi Smith, 1860 | Caecum cooperi | 19 |
| Meioceras cornucopiae Carpenter, 1859 | Meioceras cornucopiae | 3477 |
| Caecum coronatum Folin, 1867 | Caecum imbricatum | 75097 |
| Caecum coronellum Dall, 1892 | Caecum cycloferum | 75097 |
| Caecum costulatum Folin, 1870 | Caecum costulatum | 83435 |
| Caecum coxi Folin, 1869 | Meioceras nitidum | 75097 |
| Caecum crebricinctum Carpenter, 1864 | Caecum crebricinctum | 19 |
| Caecum crispum Verrill & Bush, 1900 | Caecum crispum | 83435 |
| Caecum crossei Folin, 1869 | Meioceras nitidum | 75097 |
| Meioceras cubitatum de Folin, 1868 | Meioceras cubitatum | 3477 |
| Caecum curtatum Folin, 1867 | Caecum pulchellum | 75097 |
| Caecum cycloferum de Folin, 1867 | Caecum cycloferum | 19 |
| Caecum dalli Bartsch, 1920 | Caecum dalli | 19 |
| Caecum debile Verrill & Bush, 1900 | Caecum debile | 83435 |
| Caecum decussatum Folin, 1868 | Caecum plicatum | 75097 |
| Caecum delicatulum Verrill & Bush, 1900 | Caecum delicatulum | 83435 |
| Caecum deshayesi Folin, 1869 | Meioceras nitidum | 75097 |
| Caecum diegense Bartsch, 1920 | Caecum dalli | 75097 |
| Caecum directum Vannozzi, 2019 | Caecum directum | 3477 |
| Caecum donmoorei Mitchell-Tapping, 1979 | Caecum donmoorei | 83435 |
| Caecum dux Folin, 1871 | Caecum pulchellum | 75097 |
| Caecum eliezeri Absalao, 1997 | Caecum eliezeri | 83435 |
| Caecum elongatum Folin, 1874 | Caecum elongatum | 83435 |
| Caecum exile de Folin, 1880 | Caecum exile | 3477 |
| Caecum fischeri Folin, 1870 | Meioceras nitidum | 75097 |
| Caecum floridanum Stimpson, 1851 | Caecum floridanum | 19 |
| Coecum floridanum Stimpson, 1851 | Caecum floridanum | 83435 |
| Caecum formulosum Folin, 1868 | Caecum imbricatum | 75097 |
| Caecum frugi Vannozzi, 2019 | Caecum frugi | 3477 |
| Caecum gibbesii Kurtz, 1860 | Caecum gibbesii | 83435 |
| Coecum gibbesii Kurtz, 1860 | Caecum gibbesii | 83435 |
| Brochina glabella Adams, 1868 | Brochina glabella | 3477 |
| Caecum glabella Adams, 1868 | Brochina glabella | 3116 |
| Caecum glabriforme Carpenter, 1857 | Caecum glabriforme | 3477 |
| Caecum glabrum Montagu, 1803 | Caecum glabrum | 19 |
| Caecum gracilis Folin, 1870 | Caecum cycloferum | 75097 |
| Caecum granulatum Vannozzi, 2019 | Caecum granulatum | 3477 |
| Caecum grippa Bartsch, 1920 | Caecum dalli | 75097 |
| Caecum gulosum Hedley, 1899 | Caecum gulosum | 3477 |
| Caecum gurgulio Carpenter, 1858 | Caecum gurgulio | 19 |
| Caecum heladum Olsson & Harbison, 1953 | Caecum heladum | 19 |
| Caecum hemisphericum Folin, 1867 | Caecum hemisphericum | 83435 |
| Micranellum heptagonum Bartsch, 1920 | Caecum heptagonum | 75097 |
| Caecum imbricatum Carpenter, 1858 | Caecum imbricatum | 19 |
| Caecum imiklis Folin, 1870 | Meioceras nitidum | 75097 |
| Caecum imperforatum Kanamacher, 1798 | Caecum trachea | 19 |
| Caecum infimum Folin, 1867 | Caecum infimum | 83435 |
| Caecum insigne Folin, 1867 | Caecum imbricatum | 75097 |
| Caecum insularum Moore, 1969 | Caecum insularum | 19 |
| Caecum irregulare Folin, 1867 | Caecum floridanum | 75097 |
| Caecum johnsoni Winkley, 1908 | Caecum johnsoni | 19 |
| Caecum jonatani Espinosa, Ortea & Fernández-Garcés, 2007 | Caecum jonatani | 83435 |
| Caecum jucundum Folin, 1867 | Caecum jucundum | 83435 |
| Caecum leoni Folin, 1874 | Caecum cornucopiae | 75097 |
| Caecum leptoglyphos Folin, 1881 | Caecum textile | 75097 |
| Caecum lermondi Dall, 1924 | Meioceras nitidum | 75097 |
| Caecum leve Folin, 1870 | Caecum leve | 83435 |
| Caecum licalum Bartsch, 1920 | Caecum dalli | 75097 |
| Caecum limpidum Folin, 1874 | Caecum limpidum | 83435 |
| Caecum lineicinctum de Folin, 1880 | Caecum lineicinctum | 3477 |
| Caecum liratocinctum Carpenter, 1857 | Caecum liratocinctum | 19 |
| Caecum maculatum Habe, 1963 | Caecum sepimentum | 3477 |
| Fartulum magellanicum di Geronimo, Privitera & Valdovinos, 1995 | Fartulum magellanicum | 83435 |
| Caecum maori Pizzini & Raines, 2006 | Caecum maori | 3477 |
| Caecum marmoratum Folin, 1869 | Meioceras nitidum | 75097 |
| Caecum massambabense Absalao, 1994 | Caecum massambabense | 83435 |
| Caecum moreleti Folin, 1869 | Meioceras nitidum | 75097 |
| Caecum multicostatum Folin, 1867 | Caecum multicostatum | 83435 |
| Caecum nasutum Vannozzi, 2019 | Caecum nasutum | 3477 |
| Caecum nebulosum Rehder, 1943 | Caecum cornucopiae | 75097 |
| Caecum neocaledonicum de Folin, 1868 | Caecum neocaledonicum | 3477 |
| Caecum neoguineanum Vannozzi, 2019 | Caecum neoguineanum | 3477 |
| Caecum nitidum Stimpson, 1851 | Meioceras nitidum | 19 |
| Coecum nitidum Stimpson, 1851 | Meioceras nitidum | 83435 |
| Caecum nofronii Vannozzi, 2019 | Caecum nofronii | 3477 |
| Caecum oahuense Pilsbry, 1921 | Caecum oahuense | 3477 |
| Caecum phronimun Folin, 1867 | Caecum floridanum | 75097 |
| Caecum planum Folin, 1874 | Caecum planum | 83435 |
| Caecum plicatum Carpenter, 1858 | Caecum plicatum | 19 |
| Caecum pulchellum Stimpson, 1851 | Caecum pulchellum | 19 |
| Coecum pulchellum Stimpson, 1851 | Caecum pulchellum | 83435 |
| Caecum puntagordanum Weisborg, 1962 | Caecum floridanum | 75097 |
| Caecum rapanuiense Raines & Pizzini, 2005 | Caecum rapanuiense | 3477 |
| Caecum regulare Carpenter, 1858 | Caecum regulare | 19 |
| Caecum rijgersmai Jong & Coomans, 1988 | Caecum rijgersmai | 83435 |
| Caecum rostratum de Folin, 1881 | Caecum rostratum | 3477 |
| Caecum rotundum Folin, 1869 | Meioceras nitidum | 75097 |
| Caecum ryssotitum de Folin, 1867 | Caecum ryssotitum | 19 |
| Meioceras sandwichense de Folin, 1881 | Mauroceras sandwichense | 3477 |
| Caecum sepimentum de Folin, 1868 | Caecum sepimentum | 3477 |
| Caecum smithi Cooper, 1872 | Caecum cooperi | 75097 |
| Caecum solitarium Oliver, 1915 | Caecum maori | 3477 |
| Brochina someri Folin, 1867 | Caecum someri | 83435 |
| Caecum striatum Folin, 1868 | Caecum striatum | 83435 |
| Caecum strictum Folin, 1871 | Caecum strictum | 83435 |
| Caecum strigosum de Folin, 1868 | Caecum strigosum | 19 |
| Caecum subannulatum de Folin, 1870 | Caecum subannulatum | 1056 |
| Strebloceras subannulatum de Folin, 1880 | Strebloceras subannulatum | 3477 |
| Caecum subinflexum Folin, 1869 | Meioceras nitidum | 75097 |
| Caecum subornatum Folin, 1874 | Caecum subornatum | 83435 |
| Caecum subvolutum de Folin, 1874 | Caecum subvolutum | 19 |
| Caecum taeniatum Folin, 1869 | Caecum taeniatum | 83435 |
| Caecum tenerum Folin, 1869 | Meioceras cubitatum | 75097 |
| Caecum tenue Verrill & Bush, 1900 | Caecum tenue | 83435 |
| Caecum tenuicostatum Folin, 1881 | Caecum tenuicostatum | 83435 |
| Caecum termes Heilprin, 1889 | Caecum plicatum | 75097 |
| Caecum textile de Folin, 1867 | Caecum textile | 19 |
| Caecum tinctum Folin, 1869 | Caecum tinctum | 83435 |
| Caecum tomaculum Weisbord, 1962 | Caecum ryssotitum | 75097 |
| Caecum tornatum Verrill & Bush, 1900 | Caecum tornatum | 19 |
| Caecum torquetum Folin, 1867 | Caecum torquetum | 83435 |
| Caecum tortile Dall, 1892 | Caecum tortile | 19 |
| Caecum troglodyta Moolenbeek, Faber & Iliffe, 1989 | Caecum troglodyta | 83435 |
| Caecum tumidissimum Folin, 1869 | Meioceras nitidum | 75097 |
| Meioceras tumidissimum Folin, 1869 | Meioceras nitidum | 83435 |
| Caecum undulosum Folin, 1869 | Meioceras nitidum | 75097 |
| Caecum variegatum de Folin, 1867 | Caecum variegatum | 3477 |
| Caecum venosum Folin, 1867 | Caecum venosum | 83435 |
| Caecum veracruzanum Folin, 1870 | Caecum vestitum | 75097 |
| Caecum vertebrale Hedley, 1899 | Caecum vertebrale | 3477 |
| Caecum vestitum de Folin, 1868 | Caecum vestitum | 19 |
| Caecum zaagmani Jong & Coomans, 1988 | Caecum zaagmani | 83435 |
| Caecum zonulatum Folin, 1869 | Caecum zonulatum | 83435 |