Cerion abacoensis H.A. Pilsbry & E.G. Vanatta,1895
Strophiops abbotti W.J. Clench, 1961
Strophiops acceptoria C.J. Maynard, 1913
Strophiops accuminator C.J. Maynard & W.F. Clapp,1920
Protocerion acherontis (FOSSIL) (B. Roth & O. Hartman,1998 †)
Strophiops acuta (C.J. Maynard, 1889)
Cerion acuticostatum M.I. Sánchez Roig, 1948
Strophiops adumbra C.J. Maynard & W.F. Clapp,1920
Cerion aedilii C.G. Aguayo& C. de la Torre, 1951
Cerion agassizii W.H. Dall, 1894
Cerion agrestina C.J. Maynard, 1894
Strophiops agricola C.J. Maynard, 1919
Cerion aguayoi C. de la Torre& W.J. Clench, 1957
Cerion aguayoi bequaerti C. de la Torre& W.J. Clench, 1932
Strophiops ajax C.J. Maynard, 1924
Strophiops albata C.J. Maynard & W.F. Clapp,1921
Cerion alberti W.J. Clench & C.G. Aguayo,1949
Cerion albicostata (C.J. Maynard, 1894)
Strophiops albolabra W.J. Clench, 1952
Cerion alcaldei C.G. Aguayo& M.I. Sánchez Roig, 1953
Cerion alleni C. de la Torrein H.A. Pilsbry, 1929
Cerion alvearia L.W. Dillwyn, 1817
Strophiops angustocostata C.J. Maynard & W.F. Clapp,1921
Cerion arangoi (H.A. Pilsbry& E.G. Vanatta, 1896)
Brasilennea arethusae (FOSSIL) C.J. Maury, 1935 †
Strophiops argentia C.J. Maynard, 1913
Strophiops armouri W.J. Clench, 1933
Cerion arubanum H.B. Baker, 1924
Cerion asperum (C.J. Maynard & W.F. Clapp,1920)
Strophiops avita C.J. Maynard, 1913
Cerion baconi P. Bartsch, 1952
Cerion banesense W.J. Clench & C.G. Aguayo,1949
Strophiops barbouri W.J. Clench, 1933
Cerion bariayi C.G. Aguayo & M.L. Jaume,1957
Cerion barroi C.G. Aguayo & M.L. Jaume,1957