Cerion ramsdeni C. de la Torrein D.A. Welch, 1934
Cerion recessa (C.J. Maynard & W.F. Clapp,1919)
Cerion regina H.A. Pilsbry & E.G. Vanatta,1895
Cerion regina brevispira H.A. Pilsbry & E.G. Vanatta,1895
Cerion regina eucosmium H.A. Pilsbry & E.G. Vanatta,1895
Cerion regina percostatum H.A. Pilsbry & E.G. Vanatta,1895
Cerion regina swiftii H.A. Pilsbry & E.G. Vanatta,1895
Cerion regium W.H. Benson, 1841
Cerion reliqua (C.J. Maynard & W.F. Clapp,1921)
Cerion reticulatum W.H. Dall, 1905
Cerion ricardi W.J. Clench & C.G. Aguayo,1951
Cerion ritchiei (C.J. Maynard, 1894)
Cerion ritchiei gigantea (C.J. Maynard, 1894)
Cerion ritchiei grayi (C.J. Maynard, 1894)
Cerion ritchiei vannostrandi H.A. Pilsbry & E.G. Vanatta,1896
Cerion robusta C.J. Maynard, 1894
Cerion rodrigoi S.J. Gould, 1997
Cerion romanoensis C.G. Aguayo& M.I. Sánchez Roig, 1953
Cerion royi C.G. Aguayo & M.L. Jaume,1951
Cerion rubicundum K.T. Menke, 1829
Cerion rubra (G. Humphrey, 1787)
Cerion rude (L. Pfeiffer, 1855)
Cerion rufina (C.J. Maynard, 1913)
Cerion rufolabris H.H. Beck, 1837
Cerion saetiae M.I. Sánchez Roig, 1948
Cerion sagraianum (L. Pfeiffer, 1847)
Cerion sainthilarius M.I. Sánchez Roig, 1951
Cerion salinaria (C.J. Maynard, 1913)
Cerion salvatori C. de la Torrein H.A. Pilsbry, 1927
Cerion sama W.J. Clench & C.G. Aguayo
Cerion sanchezi W.J. Clench & C.G. Aguayo,1953
Cerion sanctacruzense C.G. Aguayo & M.L. Jaume,1951
Cerion sanctamariae C.G. Aguayo & M.L. Jaume,1951
Cerion sanzi Blanes in H.A. Pilsbry& E.G. Vanatta, 1898
Cerion sarcostoma H.A. Pilsbry & Vannata,1896