abnormale, Caecum abnormale Carpenter, 1857
abreviatum, Caecum abreviatum de Folin, 1870
achirona, Caecum achirona (de Folin, 1867)
achirona striata, Caecum achirona striata de Folin, 1867 - syn of: Caecum someri (de Folin, 1867)
agoniatum, Caecum agoniatum de Folin, 1867
alabriforme, Caecum alabriforme Carpenter, 1857 - syn of: Caecum glabriforme Carpenter, 1857
amaltheanum, Caecum amaltheanum Hedley, 1899
amamiense, Caecum amamiense (Habe, 1978)
ambyloceras, Meioceras ambyloceras Woodring, 1959 † (FOSSIL)
amputatum, Caecum amputatum Hedley, 1894
amydroglyptum, Caecum amydroglyptum Rehder, 1980
anellifer, Caecum anellifer Pilsbry & Johnson, 1917 † (FOSSIL)
angustum, Caecum angustum de Folin, 1879
annulatum, Ponderoceras annulatum (Iredale & Laseron, 1957)
annulatum, Caecum annulatum Emmons, 1858 - syn of: Caecum floridanum Stimpson, 1851
antillarum, Caecum antillarum Carpenter, 1858
apanium, Meioceras apanium Woodring, 1928 † (FOSSIL)
arabicum, Caecum arabicum Issel, 1869
arcuatum, Caecum arcuatum de Folin, 1867 - syn of: Caecum sepimentum de Folin, 1868
armonicum, Caecum armonicum de Folin, 1869 - syn of: Caecum armoricum de Folin, 1869
armoricum, Caecum armoricum de Folin, 1869
armorum, Gladioceras armorum Iredale & Laseron, 1957 - syn of: Parastrophia elegans (de Folin, 1880)
asturiana, Parastrophia asturiana de Folin, 1870
atlantidis, Caecum atlantidis Watson, 1897
attenuatum, Caecum attenuatum de Folin, 1879
auriculatum, Caecum auriculatum de Folin, 1868
auriculatum decurtatum, Caecum auriculatum decurtatum Monterosato, 1884
austrafricanum, Caecum austrafricanum Vannozzi, Pizzini & Raines, 2015
australe, Caecum australe Pizzini & Raines, 2011
avaricosa, Parastrophia avaricosa Vannozzi, Pizzini & Raines, 2015
bahiahondaense, Caecum bahiahondaense Strong & Hertlein, 1939
bakeri, Caecum bakeri (Bartsch, 1920)
banoni, Brochina banoni Benoist, 1874 † (FOSSIL)
barklayense, Caecum crebricinctum barklayense Bartsch
bathus, Caecum bathus Pizzini, Raines & Vannozzi, 2013
beaufortensis, Caecum beaufortensis Ward & Blackwelder, 1987 † (FOSSIL)
benhami, Caecum benhami Goedert & Raines, 2016 † (FOSSIL)
bensoni, Caecum bensoni Goedert & Raines, 2016 † (FOSSIL)
berberense, Caecum berberense Ladd, 1972 - syn of: Caecum sepimentum de Folin, 1868
bermudezi, Caecum bermudezi Pilsbry & Aguayo, 1934 - syn of: Meioceras cornucopiae Carpenter, 1859
berthae, Caecum berthae Morretes, 1954 - syn of: Caecum plicatum Carpenter, 1858
bezanconi, Strebloceras bezanconi (Cossmann, 1888) † (FOSSIL)
bicarinatum, Ctiloceras bicarinatum Iredale & Laseron, 1957
bicinctum, Caecum bicinctum de Folin, 1870
bicolor, Caecum impartitum bicolor de Folin
bimamillatum, Caecum bimamillatum de Folin, 1867
bimarginatum, Caecum bimarginatum Carpenter, 1859
bimarginatum, Caecum bimarginatum Dautzenberg, 1912 - syn of: Caecum rolani Pizzini & Nofroni, 2001
biminicola, Caecum biminicola Pilsbry, 1951 - syn of: Caecum plicatum Carpenter, 1858
bipartitum, Caecum bipartitum de Folin, 1870
bipartitum maculatum, Caecum bipartitum maculatum de Folin, 1870 - syn of: Caecum bipartitum de Folin, 1870
bitumidum, Caecum bitumidum de Folin, 1869 - syn of: Meioceras nitidum (Stimpson, 1851)
borneoensis, Caecum borneoensis de Folin, 1867
boucheti, Meioceras boucheti Pizzini & Raines, 2011
bounty, Caecum bounty Pizzini & Raines, 2011
brasilicum, Caecum brasilicum de Folin, 1874
brennani, Caecum brennani Raines & Pizzini, 2009
breve, Caecum breve de Folin, 1867
buccina, Caecum buccina de Folin, 1870 - syn of: Caecum circumvolutum Folin, 1867
bucerium, Caecum bucerium Golikov, 1967
butoti, Caecum butoti De Jong & Coomans, 1988 - syn of: Caecum marmoratum de Folin, 1869
cabanensis, Meioceras cabanensis de Folin & Bèrillon, 1874 - syn of: Brochina banoni Benoist, 1874 †
californicum, Caecum californicum Dall, 1885
calvertense, Caecum calvertense Martin, 1904 † (FOSSIL)
campanulatum, Caecum campanulatum Raines & Pizzini, 2005
campe, Caecum campe Pilsbry & Olsson, 1941 † (FOSSIL)
capitanum, Caecum capitanum de Folin, 1874 - syn of: Caecum pulchellum Stimpson, 1851
carmenense, Caecum carmenense de Folin, 1870 - syn of: Caecum circumvolutum Folin, 1867
carolinianum, Caecum carolinianum Dall, 1892
carpenteri, Caecum carpenteri (Bartsch, 1920)
carpenteri, Meioceras carpenteri de Folin, 1869 - syn of: Meioceras nitidum (Stimpson, 1851)
carpenteri, Caecum carpenteri Deshayes, 1861 † (FOSSIL)
catalinense, Caecum crebricinctum catalinense Bartsch
caverna, Caecum caverna Moolenbeek, Faber & Iliffe, 1989
cayoense, Caecum cayoense Rehder, 1943 - syn of: Caecum floridanum Stimpson, 1851
challengeri, Parastrophia challengeri de Folin, 1880
chiereghiniana, Caecum chiereghiniana Brusina, 1869 - syn of: Caecum auriculatum de Folin, 1868
chilense, Caecum chilense Stuardo, 1962
chinense, Caecum chinense de Folin, 1867
chipolanum, Caecum chipolanum Gardner, 1947 † (FOSSIL)
cinctum, Caecum cinctum Olsson & Harbison, 1953
cingulatum, Meioceras cingulatum Dall, 1892 - syn of: Meioceras nitidum (Stimpson, 1851)
cingulatum, Caecum cingulatum Dall, 1892 - syn of: Meioceras nitidum (Stimpson, 1851)
circumvolutum, Caecum circumvolutum Folin, 1867
clarkii, Caecum clarkii Carpenter, 1859
clarum, Caecum clarum Lamy, 1910
clathratum, Caecum clathratum Carpenter, 1857
clathratum, Ctiloceras clathratum Hedley, 1902
clava, Caecum clava de Folin, 1867
clenchi, Caecum clenchi Olsson & McGinty, 1958 - syn of: Caecum cycloferum Folin, 1867
clenchi, Caecum clenchi Olsson & McGinty, 1958 - syn of: Caecum cycloferum Folin, 1867
cocoense, Caecum cocoense Sibaja-Cordero, García-Méndez & Troncoso, 2013
codoceoae, Caecum codoceoae Gálvez & Huidobro, 2017
compactum, Caecum compactum Carpenter, 1857
complanatum, Caecum complanatum de Folin, 1867
compressa, Jayella compressa Iredale & Laseron, 1957
condylum, Caecum condylum Moore, 1969
conjunctum, Caecum conjunctum de Folin, 1867 - syn of: Caecum pulchellum Stimpson, 1851
constrictum, Caecum constrictum Gabb, 1873 - syn of: Meioceras cornucopiae Carpenter, 1859
constrictum, Meioceras constrictum Pilsbry & Aguayo, 1933 - syn of: Meioceras cornucopiae Carpenter, 1859
continens, Caecum continens Linden & Moolenbeek, 2000
contractum, Caecum contractum de Folin, 1870 - syn of: Caecum bipartitum de Folin, 1870
contractum, Meioceras contractum de Folin, 1874 - syn of: Meioceras nitidum (Stimpson, 1851)
cooki, Caecum cooki Pizzini & Raines, 2011
cooperi, Caecum cooperi Smith, 1860
corneum, Caecum corneum Dunker, 1875 - syn of: Caecum ryssotitum de Folin, 1867
cornubovis, Caecum cornubovis Carpenter, 1859 - syn of: Meioceras cornucopiae Carpenter, 1859
cornubovis marmorata, Caecum cornubovis marmorata de Folin, 1869 - syn of: Meioceras cornucopiae Carpenter, 1859
cornubovis subvitrea, Caecum cornubovis subvitrea de Folin, 1869 - syn of: Meioceras cornucopiae Carpenter, 1859
cornubovis tincta, Caecum cornubovis tincta de Folin, 1869 - syn of: Meioceras cornucopiae Carpenter, 1859
cornucopiae, Parastrophia cornucopiae (de Folin, 1869)
cornucopiae, Meioceras cornucopiae Carpenter, 1859
cornuoides, Strebloceras cornuoides Carpenter † (FOSSIL)
coronatum, Caecum coronatum de Folin, 1867 - syn of: Caecum imbricatum Carpenter, 1858
coronellum, Bambusum coronellum Dall, 1892 - syn of: Caecum cycloferum Folin, 1867
coronellum, Caecum coronellum Dall, 1892 - syn of: Caecum cycloferum Folin, 1867
corrugatulum, Caecum corrugatulum Carpenter, 1857
corrugulatum, Brochina corrugulatum Carpenter, 1857 - syn of: Caecum corrugatulum Carpenter, 1857
costatum, Caecum costatum Verrill, 1872 - syn of: Caecum cooperi Smith, 1860
coxi, Caecum coxi de Folin, 1869 - syn of: Meioceras nitidum (Stimpson, 1851)
crassicostum, Caecum crassicostum Gabb, 1881 - syn of: Caecum floridanum Stimpson, 1851
crassum, Caecum crassum de Folin, 1870
crebricinctum, Caecum crebricinctum Carpenter, 1864
crebricinctum barklayense, Caecum crebricinctum barklayense Bartsch, 1920
crebricinctum catalinense, Caecum crebricinctum catalinense Bartsch, 1920
crebricinctum oregonense, Caecum crebricinctum oregonense Bartsch, 1920
crebricinctum pedroense, Caecum crebricinctum pedroense Bartsch, 1920
crispum, Caecum crispum Verrill & Bush, 1900
crossei, Caecum crossei de Folin, 1869 - syn of: Meioceras nitidum (Stimpson, 1851)
cubitatum, Meioceras cubitatum de Folin, 1868
curtatum, Caecum curtatum de Folin, 1867 - syn of: Caecum pulchellum Stimpson, 1851
cuspidatum, Caecum cuspidatum Chaster, 1896
cyclicum, Ctiloceras cyclicum (Watson, 1886)
cycloferum, Caecum cycloferum Folin, 1867
cycloferum gracile, Caecum cycloferum gracile de Folin, 1870 - syn of: Caecum cycloferum Folin, 1867
cygnicollis, Parastrophia cygnicollis (Hedley, 1904)
dakuwaqa, Caecum dakuwaqa Pizzini, Raines & Vannozzi, 2013
dalli, Caecum dalli Bartsch, 1920
danielei, Caecum danielei Pizzini & Raines, 2011
debile, Caecum debile Verrill & Bush, 1900
decurtata, Brochina decurtata Monterosato, 1884 - syn of: Caecum auriculatum decurtatum Monterosato, 1884
decurtatum, Caecum auriculatum decurtatum Monterosato
decussatum, Caecum decussatum de Folin, 1869 - syn of: Caecum plicatum Carpenter, 1858
decussatum, Caecum decussatum Folin, 1869 - syn of: Caecum plicatum Carpenter, 1858
delicatulum, Caecum delicatulum Verrill & Bush, 1900
derjugini, Caecum derjugini Golikov, 1967
deshayesi, Caecum deshayesi de Folin, 1869 - syn of: Meioceras nitidum (Stimpson, 1851)
dextroversum, Caecum dextroversum Carpenter, 1857
digitulum, Caecum digitulum Hedley, 1904
diminutum, Caecum diminutum Adams, 1852
donmoorei, Caecum donmoorei Mitchell-Tapping, 1979
dux, Caecum dux de Folin, 1871 - syn of: Caecum floridanum Stimpson, 1851
eburneum, Caecum eburneum Adams, 1852
edwardsi, Strebloceras edwardsi (Deshayes, 1861) † (FOSSIL)
elagans, Caecum elagans Deregaslavtseva, 1891 - syn of: Caecum trachea (Montagu, 1803)
elegans, Parastrophia elegans (de Folin, 1880)
elegans, Watsonia elegans de Folin, 1880 - syn of: Parastrophia elegans (de Folin, 1880)
elegans, Caecum elegans Periaslavzev, 1891 - syn of: Caecum trachea (Montagu, 1803)
elegantissimum, Caecum elegantissimum Carpenter, 1859
elegantissimum searles, Caecum elegantissimum searles Carpenter, 1859 - syn of: Caecum searleswoodii Carpenter, 1859
elegantissimum searleswoodii, Caecum elegantissimum searleswoodii Carpenter, 1859 - syn of: Caecum searleswoodii Carpenter, 1859
eliezeri, Caecum eliezeri Absalão, 1997
elongatum, Caecum elongatum Carpenter, 1857
engli, Caecum engli Nofroni, Pizzini & Oliverio, 1997
erseusi, Parastrophia erseusi Hughes, 1993
erucatum, Caecum erucatum de Folin, 1867
eunoi, Caecum eunoi Nofroni, Pizzini & Oliverio, 1997
exile, Caecum exile de Folin, 1875
farcimen, Caecum farcimen Carpenter, 1857
fasciatum, Caecum fasciatum de Folin, 1877 - syn of: Caecum trachea (Montagu, 1803)
fasciatum intaminata, Caecum fasciatum intaminata de Folin, 1876 - syn of: Caecum trachea (Montagu, 1803)
fibratum, Caecum fibratum de Folin & Bèrillon, 1874 † (FOSSIL)
fijiense, Caecum fijiense Pizzini, Raines & Vannozzi, 2013
filum, Parastrophia filum Melvill, 1906 - syn of: Parastrophia cornucopiae (de Folin, 1869)
firmatum, Caecum firmatum Adams, 1852
fischeri, Caecum fischeri de Folin, 1870 - syn of: Meioceras nitidum (Stimpson, 1851)
flemingi, Defolinia flemingi (Gardner & Aldrich, 1919) † (FOSSIL)
floridanum, Caecum floridanum Stimpson, 1851
folini, Parastrophia folini Bucquoy, Dautzenberg & Dollfus, 1884 - syn of: Parastrophia asturiana de Folin, 1870
folini, Caecum folini Kisch, 1959
formulosum, Caecum formulosum de Folin, 1869 - syn of: Caecum imbricatum Carpenter, 1858
formulosum paucicostata, Caecum formulosum paucicostata de Folin, 1869 - syn of: Caecum imbricatum Carpenter, 1858
formulosum simplex, Caecum formulosum simplex de Folin, 1869 - syn of: Caecum imbricatum Carpenter, 1858
formulosum sulcata, Caecum formulosum sulcata de Folin, 1869 - syn of: Caecum imbricatum Carpenter, 1858
fulvum, Caecum fulvum Kisch, 1959 - syn of: Caecum neocaledonicum de Folin, 1867
geigeri, Caecum geigeri Pizzini & Raines, 2011
glabellum, Caecum glabellum (Adams, 1868)
glabriforme, Caecum glabriforme Carpenter, 1857
glabrum, Caecum glabrum (Montagu, 1803)
glabrum elongatum, Caecum glabrum elongatum de Folin, 1874 - syn of: Caecum glabrum (Montagu, 1803)
glabrum gallicum, Caecum glabrum gallicum de Folin, 1872 - syn of: Caecum glabrum (Montagu, 1803)
gofasi, Caecum gofasi Pizzini & Nofroni, 2001
gracile, Caecum gracile Gould, 1861
greensboroense, Caecum greensboroense Martin, 1904 † (FOSSIL)
gulosum, Caecum gulosum Hedley, 1899
gurgulio, Caecum gurgulio Carpenter, 1858
heladum, Caecum heladum Olsson & Harbison, 1953 - syn of: Caecum multicostatum de Folin, 1867
hemisphericum, Caecum hemisphericum de Folin, 1867
hemphilli, Fartulum hemphilli Bartsch, 1920 - syn of: Caecum occidentale (Bartsch, 1920)
heptagonum, Caecum heptagonum Carpenter, 1857
heterapex, Caecum heterapex Habe, 1963 - syn of: Caecum clarum Lamy, 1910
heterochromum, Caecum heterochromum Raines & Pizzini, 2005
hinemoa, Strebloceras hinemoa Finlay, 1931
hinoidei, Caecum hinoidei Habe, 1978 - syn of: Caecum neocaledonicum de Folin, 1867
imbricatum, Caecum imbricatum Carpenter, 1858
imiklis, Caecum imiklis de Folin, 1870 - syn of: Meioceras nitidum (Stimpson, 1851)
impartitum, Caecum impartitum de Folin, 1867
impartitum bicolor, Caecum impartitum bicolor de Folin, 1867
imperfectum, Caecum imperfectum de Folin, 1867
imperforatum, Caecum imperforatum Kanmacher, 1798 - syn of: Caecum trachea (Montagu, 1803)
incisum, Caecum incisum Vannozzi, Pizzini & Raines, 2015
inclinatum, Caecum inclinatum de Folin, 1869
incompta, Caecum incompta Monterosato, 1884 - syn of: Caecum armoricum de Folin, 1869
infimum, Caecum infimum de Folin, 1867
inflatum, Caecum inflatum de Folin, 1869
inhacaense, Caecum inhacaense Albano & Pizzini, 2011
insculptum, Caecum insculptum Carpenter, 1857
insigne, Caecum insigne de Folin, 1867 - syn of: Caecum imbricatum Carpenter, 1858
instructum, Caecum instructum de Folin, 1870 - syn of: Caecum bipartitum de Folin, 1870
insularum, Caecum insularum Moore, 1969
interruptum, Caecum interruptum de Folin, 1867
intortum, Caecum intortum Vannozzi, Pizzini & Raines, 2015
irregulare, Caecum irregulare de Folin, 1867
japonica, Parastrophia japonica Hinoide & Habe, 1978
japonicum, Caecum japonicum (Habe, 1978)
johnsoni, Caecum johnsoni Winkley, 1908
jonatani, Caecum jonatani Espinosa, Ortea & Fernández-Garcés, 2007
jucundum, Caecum jucundum de Folin, 1867
jucundum parva, Caecum jucundum parva de Folin, 1870 - syn of: Caecum jucundum de Folin, 1867
kajiyamai, Meioceras kajiyamai Habe, 1963
kilburni, Strebloceras kilburni Pizzini, Raines & Vannozzi, 2013
knysnaense, Caecum knysnaense Vannozzi, Pizzini & Raines, 2015
kontiki, Caecum kontiki Pizzini & Raines, 2011
laeve, Caecum laeve Adams, 1852
laevigata, Pseudoparastrophia laevigata Di Staso, 1905 - syn of: Parastrophia asturiana de Folin, 1870
laevissimum, Odontidium laevissimum Cantraine, 1842 - syn of: Caecum auriculatum de Folin, 1868
lapita, Caecum lapita Pizzini, Raines & Vannozzi, 2013
laqueatum, Caecum laqueatum Adams, 1852
larieyense, Caecum larieyense Lozouet, Lesport & Renard, 2001 † (FOSSIL)
legumen, Meioceras legumen (Hedley, 1899)
legumen, Caecum legumen Hedley, 1899 - syn of: Meioceras legumen (Hedley, 1899)
leilae, Caecum leilae Vannozzi, Pizzini & Raines, 2015
leoni, Caecum leoni Bèrillon, 1874 - syn of: Meioceras nitidum (Stimpson, 1851)
leoni, Meioceras leoni Bèrillon, 1874 - syn of: Meioceras nitidum (Stimpson, 1851)
leptoglyphos, Caecum leptoglyphos de Folin, 1881 - syn of: Caecum textile de Folin, 1867
lermondi, Caecum lermondi Dall, 1924 - syn of: Meioceras nitidum (Stimpson, 1851)
lightfootae, Caecum lightfootae Pizzini, Nofroni & Oliverio, 1994 - syn of: Caecum atlantidis Watson, 1897
lilianum, Caecum lilianum Hedley, 1903 - syn of: Caecum sepimentum de Folin, 1868
limnetes, Caecum limnetes Long, 1972
limpidum, Caecum limpidum de Folin, 1874
lindae, Caecum lindae Vannozzi, Pizzini & Raines, 2015
lineicinctum, Caecum lineicinctum de Folin, 1880
liratocinctum, Caecum liratocinctum Carpenter, 1857
lohri, Caecum lohri Strong & Hertlein, 1939
loyaltense, Caecum loyaltense Pizzini, Raines & Vannozzi, 2013
lucidum, Caecum lucidum de Folin, 1867
macrum, Caecum macrum Linden & Moolenbeek, 2000
maculatum, Caecum maculatum Habe, 1963 - syn of: Caecum sepimentum de Folin, 1868
maestratii, Caecum maestratii Pizzini, Raines & Vannozzi, 2013
magatama, Fartulum magatama Habe, 1978 - syn of: Meioceras legumen (Hedley, 1899)
magatama, Meioceras magatama Habe, 1978 - syn of: Meioceras legumen (Hedley, 1899)
magellanicum, Caecum magellanicum Di Geronimo, Privitera & Valdovinos, 1995
malleatum, Caecum malleatum de Folin, 1867
malleatum sublaevis, Caecum malleatum sublaevis de Folin, 1868 - syn of: Caecum modestum de Folin, 1868
mammillatum, Caecum mammillatum Wood, 1842 † (FOSSIL)
maori, Caecum maori Pizzini & Raines, 2006
maraisi, Caecum maraisi Vannozzi, Pizzini & Raines, 2015
marginatum, Caecum marginatum de Folin, 1869
mariae, Caecum mariae de Folin, 1881 - syn of: Meioceras cornucopiae Carpenter, 1859
marmoratum, Caecum marmoratum de Folin, 1869
massambabense, Caecum massambabense Absalão, 1994
massambabensis, Caecum massambabensis Absalão, 1994 - syn of: Caecum massambabense Absalão, 1994
mauritianum, Caecum mauritianum de Folin, 1867
mediterranea, Parastrophia mediterranea (Costa, 1861)
megadattilida, Parastrophia megadattilida Pizzini, Raines & Vannozzi, 2013
melanesiana, Parastrophia melanesiana Pizzini, Raines & Vannozzi, 2013
metamorphosicum, Caecum metamorphosicum Lima, Santos & Absalão, 2013
mexicanum, Caecum mexicanum Collins, 1937 † (FOSSIL)
microcyclus, Caecum microcyclus de Folin, 1879
microstriatum, Caecum microstriatum Pizzini, Raines & Vannozzi, 2013
mineuri, Caecum mineuri Lozouet, 1999 † (FOSSIL)
minor, Cornuoides minor Brown, 1827
minutum, Caecum minutum de Folin, 1867
mirabile, Caecum mirabile de Folin, 1867
mirificum, Caecum mirificum de Folin, 1867
modestum, Caecum modestum de Folin, 1868
monstrosum, Caecum monstrosum Adams, 1852
moorei, Caecum moorei Marincovich, 1973
moreleti, Caecum moreleti de Folin, 1869 - syn of: Meioceras nitidum (Stimpson, 1851)
morgan, Caecum morgan Vannozzi, Pizzini & Raines, 2015
multiannulatum, Caecum multiannulatum Dautzenberg & Bouge, 1933 - syn of: Caecum vertebrale Hedley, 1899
multicostatum, Caecum multicostatum de Folin, 1867
musorstomi, Caecum musorstomi Pizzini, Raines & Vannozzi, 2013
mutabile, Caecum mutabile de Folin, 1869
nebulosum, Caecum nebulosum Rehder, 1943 - syn of: Meioceras cornucopiae Carpenter, 1859
nemoralis, Caecum nemoralis Lozouet, 2015
neocaledonicum, Caecum neocaledonicum de Folin, 1867
nitidum, Meioceras nitidum (Stimpson, 1851)
oahuense, Caecum oahuense Pilsbry, 1921
obesum, Caecum obesum Verrill & Bush, 1900 - syn of: Caecum plicatum Carpenter, 1858
obtusum, Caecum obtusum Carpenter, 1857
occidentale, Caecum occidentale (Bartsch, 1920)
occidentale, Fartulum occidentale Bartsch, 1920 - syn of: Caecum occidentale (Bartsch, 1920)
occultum, Caecum occultum de Folin, 1867
orcutti, Caecum orcutti Dall, 1885
oregonense, Caecum crebricinctum oregonense Bartsch
orientale, Caecum orientale Carpenter, 1868 - syn of: Caecum clarkii Carpenter, 1859
ornata, Parastrophia ornata Vannozzi, Pizzini & Raines, 2015
paradoxum, Caecum paradoxum de Folin, 1867
parvulum, Caecum parvulum de Folin, 1867
parvum, Caecum parvum Adams, 1852
pascuanum, Caecum pascuanum Raines & Pizzini, 2005
patuxentium, Caecum patuxentium Martin, 1904 † (FOSSIL)
pedroense, Caecum crebricinctum pedroense Bartsch
pertenuis, Fartulum pertenuis Laws, 1941 † (FOSSIL)
phronimum, Caecum phronimum de Folin, 1867 - syn of: Caecum floridanum Stimpson, 1851
pizzinii, Strebloceras pizzinii Vannozzi, 2016
planum, Caecum planum de Folin, 1874
planum minor, Caecum planum minor de Folin, 1874 - syn of: Caecum planum de Folin, 1874
plicatum, Caecum plicatum Carpenter, 1858
pollicare, Caecum pollicare Carpenter, 1859
profundicolum, Caecum profundicolum Bartsch, 1920
properegulare, Caecum properegulare Mansfield, 1925 † (FOSSIL)
pulchellum, Caecum pulchellum Stimpson, 1851
pulcherrima, Parastrophia pulcherrima Pizzini, Raines & Vannozzi, 2013
puntagordanum, Caecum puntagordanum Weisbord, 1962 - syn of: Caecum floridanum Stimpson, 1851
putnamense, Caecum putnamense Mansfield, 1924 - syn of: Caecum johnsoni Winkley, 1908
putnamensis, Defolinia putnamensis (Mansfield, 1924) † (FOSSIL)
pygmaeum, Caecum pygmaeum Adams, 1852
quadratum, Caecum quadratum Carpenter, 1857
queenslandica, Parastrophia queenslandica (Iredale & Laseron, 1957)
rapanuiense, Caecum rapanuiense Raines & Pizzini, 2005
regulare, Caecum regulare Carpenter, 1858
rehderi, Caecum rehderi Raines & Pizzini, 2005
reversum, Caecum reversum Carpenter, 1857
rhinoceros, Meioceras rhinoceros Pizzini, Raines & Vannozzi, 2013
richthofeni, Caecum richthofeni Strong & Hertlein, 1939
rijgersmai, Caecum rijgersmai De Jong & Coomans, 1988
rolani, Caecum rolani Pizzini & Nofroni, 2001
rosanum, Caecum rosanum Bartsch, 1920
rostratum, Caecum rostratum de Folin, 1881
rotundum, Caecum rotundum de Folin, 1868 - syn of: Meioceras nitidum (Stimpson, 1851)
rubella, Caecum rubella de Folin, 1867 - syn of: Caecum trachea (Montagu, 1803)
ruggerii, Caecum ruggerii Pizzini, 1997 - syn of: Caecum clarum Lamy, 1910
rugulosum, Caecum rugulosum Philippi, 1836 - syn of: Caecum trachea (Montagu, 1803)
ryssotitum, Caecum ryssotitum de Folin, 1867
ryssotitum caerulea, Caecum ryssotitum caerulea de Folin, 1867 - syn of: Caecum ryssotitum de Folin, 1867
ryssotitum cylindrica, Caecum ryssotitum cylindrica de Folin, 1870 - syn of: Caecum ryssotitum de Folin, 1867
saavedrae, Caecum saavedrae Beltran, 1965 - syn of: Caecum auriculatum de Folin, 1868
sandwichense, Meioceras sandwichense de Folin, 1881
sardinianum, Caecum sardinianum de Folin, 1870 - syn of: Caecum clarkii Carpenter, 1859
sculptum, Caecum sculptum de Folin, 1881 - syn of: Caecum imbricatum Carpenter, 1858
sealswoodi, Caecum sealswoodi Carpenter, 1859 - syn of: Caecum searleswoodii Carpenter, 1859
searleswoodii, Caecum searleswoodii Carpenter, 1859
semicinctum, Caecum semicinctum de Folin, 1867
semilaeve, Caecum semilaeve Carpenter, 1857
semitrachea, Caecum semitrachea Brusina, 1865 - syn of: Caecum clarkii Carpenter, 1859
semitracheum, Caecum semitracheum Monterosato, 1884 - syn of: Caecum clarkii Carpenter, 1859
senegambianum, Caecum senegambianum de Folin, 1870
sepimentum, Caecum sepimentum de Folin, 1868
sepimentum arcuata, Caecum sepimentum arcuata de Folin, 1867 - syn of: Caecum sepimentum de Folin, 1868
serrata, Jayella serrata Iredale & Laseron, 1957
sinuatum, Caecum sinuatum de Folin, 1867
skoglundae, Caecum skoglundae Pizzini, Raines & Nofroni, 2007
smithi, Caecum smithi Cooper, 1872 - syn of: Caecum cooperi Smith, 1860
smriglioi, Caecum smriglioi Pizzini, Nofroni & Bonfitto, 2008
solitarium, Caecum solitarium Meyer, 1886 - syn of: Caecum maori Pizzini & Raines, 2006
solitarium, Caecum solitarium Oliver, 1915 - syn of: Caecum maori Pizzini & Raines, 2006
someri, Caecum someri (de Folin, 1867)
strangulatum, Caecum strangulatum de Folin, 1867
striaosum, Caecum striaosum de Folin, 1868 - syn of: Caecum striatum de Folin, 1868
striatum, Caecum striatum de Folin, 1868
striatum, Ctiloceras striatum Hedley, 1902
striatum obsoleta, Caecum striatum obsoleta de Folin, 1874 - syn of: Caecum striatum de Folin, 1868
striatus, Brochus striatus Brown, 1827 - syn of: Caecum trachea (Montagu, 1803)
strictum, Caecum strictum de Folin, 1871
strigosum, Caecum strigosum de Folin, 1868
suave, Caecum suave de Folin, 1869
subannulatum, Caecum subannulatum de Folin, 1870
subaustrale, Caecum subaustrale Stuardo, 1970
subconicum, Caecum subconicum Carpenter, 1857
subcylindratum, Caecum subcylindratum Pizzini, Raines & Vannozzi, 2013
subflavum, Caecum subflavum de Folin, 1879
subimpressum, Caecum subimpressum Carpenter, 1857
subinflexum, Caecum subinflexum de Folin, 1869 - syn of: Meioceras nitidum (Stimpson, 1851)
subobsoletum, Caecum subobsoletum Carpenter, 1857
subornatum, Caecum subornatum de Folin, 1869
subquadratum, Caecum subquadratum Carpenter, 1859
subspirale, Caecum subspirale Carpenter, 1857
subvolutum, Caecum subvolutum de Folin, 1874
succineum, Caecum succineum de Folin, 1879
sumatrana, Parastrophia sumatrana (Thiele, 1925)
superbum, Caecum superbum de Folin, 1867
swinneni, Caecum swinneni Nofroni, Pizzini & Oliverio, 1997
syriacum, Caecum syriacum de Folin, 1869 - syn of: Caecum auriculatum de Folin, 1868
taeniatum, Caecum taeniatum de Folin, 1869
tahitianum, Caecum tahitianum Pizzini & Raines, 2011
tenerum, Caecum tenerum de Folin, 1869 - syn of: Meioceras cubitatum de Folin, 1868
tenue, Caecum tenue Milaschewitsch, 1912 - syn of: Caecum armoricum de Folin, 1869
tenue, Caecum tenue Verrill & Bush, 1900
tenuicostatum, Caecum tenuicostatum de Folin, 1881
tenuiliratum, Caecum tenuiliratum Carpenter, 1857
tenuis, Caecum tenuis Milaschewitsch, 1912 - syn of: Caecum armoricum de Folin, 1869
tenuistriatum, Caecum tenuistriatum (Böttger, 1869) † (FOSSIL)
teres, Caecum teres Carpenter, 1857
termes, Caecum termes Heilprin, 1889 - syn of: Caecum plicatum Carpenter, 1858
textile, Caecum textile de Folin, 1867
tomaculum, Caecum tomaculum Weisbord, 1962 - syn of: Caecum ryssotitum de Folin, 1867
tornatum, Caecum tornatum Verrill & Bush, 1900
torquetum, Caecum torquetum de Folin, 1867
tortile, Caecum tortile Dall, 1892
trachea, Caecum trachea (Montagu, 1803)
trachea obsoleta, Caecum trachea obsoleta Carpenter, 1859 - syn of: Caecum trachea (Montagu, 1803)
trachea taeniata, Caecum trachea taeniata de Folin, 1869 - syn of: Caecum taeniatum de Folin, 1869
trachea tincta, Caecum trachea tincta de Folin, 1869 - syn of: Caecum trachea (Montagu, 1803)
trachea zonulata, Caecum trachea zonulata de Folin, 1869 - syn of: Caecum trachea (Montagu, 1803)
trachiformis, Brochus trachiformis Brown, 1827 - syn of: Caecum trachea (Montagu, 1803)
trindadense, Caecum trindadense Lima, Santos & Absalão, 2013
triornatum, Caecum triornatum de Folin, 1870 - syn of: Caecum bipartitum de Folin, 1870
troglodyta, Caecum troglodyta Moolenbeek, Faber & Iliffe, 1989
tumidissimum, Meioceras tumidissimum de Folin, 1869
tumidum, Caecum tumidum Carpenter, 1858 † (FOSSIL)
turbinata, Enigmerces turbinata Iredale & Laseron, 1957
uncinatum, Caecum uncinatum de Folin, 1867
undatum, Caecum undatum Carpenter, 1857
undulosum, Caecum undulosum de Folin, 1869 - syn of: Meioceras nitidum (Stimpson, 1851)
uvea, Caecum uvea Pizzini, Raines & Vannozzi, 2013
validum, Caecum validum de Folin, 1867
vanuatuarum, Caecum vanuatuarum Pizzini, Raines & Vannozzi, 2013
vanuatuensis, Parastrophia vanuatuensis Pizzini, Raines & Vannozzi, 2013
varanoi, Caecum varanoi Pizzini, Nofroni & Bonfitto, 2008
variciferum, Ctiloceras variciferum Iredale & Laseron, 1957
variegatum, Caecum variegatum de Folin, 1867
venosum, Caecum venosum de Folin, 1867
venustum, Caecum venustum de Folin, 1867
veracruzanum, Caecum veracruzanum Collins, 1937 † (FOSSIL)
veracruzanum, Caecum veracruzanum de Folin, 1870 - syn of: Caecum circumvolutum Folin, 1867
verai, Caecum verai Moreno, Peñas & Rolán, 2003 † (FOSSIL)
vertebrale, Caecum vertebrale Hedley, 1899
vestitum, Caecum vestitum de Folin, 1870 - syn of: Caecum circumvolutum Folin, 1867
vestitum, Caecum vestitum Folin, 1870 - syn of: Caecum circumvolutum Folin, 1867
vestitum inornatum, Caecum vestitum inornatum de Folin, 1870 - syn of: Caecum circumvolutum Folin, 1867
vicinum, Caecum vicinum de Folin, 1870
virginiae, Caecum virginiae Pizzini, Raines & Vannozzi, 2013
virginianum, Defolinia virginianum (Meyer, 1888) † (FOSSIL)
vitreum, Caecum vitreum Carpenter, 1859
vitreum clarkii, Caecum vitreum clarkii Carpenter, 1859 - syn of: Caecum clarkii Carpenter, 1859
vitreum subornata, Caecum vitreum subornata de Folin, 1869 - syn of: Caecum vitreum Carpenter, 1859
wami, Caecum wami Raines & Pizzini, 2009
wayae, Caecum wayae Pizzini & Nofroni, 2001
zaagmani, Caecum zaagmani De Jong & Coomans, 1988
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