Caecum abnormale P.P. Carpenter, 1857
Caecum abreviatum L. de Folin, 1870
Caecum achirona (L. de Folin, 1867)
Caecum agoniatum L. de Folin, 1867
Caecum amaltheanum C. Hedley, 1899
Caecum amamiense (T. Habe, 1978)
Meioceras ambyloceras (FOSSIL) W.P. Woodring, 1959 †
Caecum amputatum C. Hedley, 1894
Caecum amydroglyptum H.A. Rehder, 1980
Caecum anellifer (FOSSIL) H.A. Pilsbry & Johnson,1917 †
Caecum angustum L. de Folin, 1879
Ponderoceras annulatum (T. Iredale & C.F. Laseron,1957)
Caecum antillarum P.P. Carpenter, 1858
Meioceras apanium (FOSSIL) W.P. Woodring, 1928 †
Caecum arabicum A. Issel, 1869
Caecum armoricum L. de Folin, 1869
Parastrophia asturiana L. de Folin, 1870
Caecum atlantidis R.B. Watson, 1897
Caecum attenuatum L. de Folin, 1879
Caecum auriculatum L. de Folin, 1868
Caecum auriculatum decurtatum T.A. de M. Monterosato,1884
Caecum austrafricanum A. Vannozzi, M. Pizzini& B.K. Raines, 2015
Caecum australe M. Pizzini & B.K. Raines,2011
Parastrophia avaricosa A. Vannozzi, M. Pizzini& B.K. Raines, 2015
Caecum bahiahondaense A.M. Strong & L.G. Hertlein,1939
Caecum bakeri (P. Bartsch, 1920)
Brochina banoni (FOSSIL) É.A. Benoist, 1874 †
Caecum bathus M. Pizzini, B.K. Raines& A. Vannozzi, 2013
Caecum beaufortensis (FOSSIL) Ward & B.W. Blackwelder,1987 †
Caecum benhami (FOSSIL) Goedert & B.K. Raines,2016 †
Caecum bensoni (FOSSIL) Goedert & B.K. Raines,2016 †
Strebloceras bezanconi (FOSSIL) (Cossmann, 1888) †
Ctiloceras bicarinatum T. Iredale & C.F. Laseron,1957
Caecum bicinctum L. de Folin, 1870
Caecum bimamillatum L. de Folin, 1867