Pachymelon regularis (FOSSIL) (H.E. Finley, 1926 †)
Eopsephaea relicta (FOSSIL) (J.F. Bayan, 1870 †)
Alcithoe renwicki (FOSSIL) (J. Marwick, 1928 †)
Spinomelon residua (FOSSIL) (Finlay, 1926 †)
Alcithoe resolutionis (FOSSIL) C.A. Fleming, 1954 †
Caricella reticulata (FOSSIL) (T.H. Aldrich, 1885 †)
Metamelon reverta (FOSSIL) (Finlay, 1926 †)
Lyria rex (FOSSIL) Hirase 1908 †
Amoria rinkensi G.T. Poppe, 1986
Adelomelon riosi W.J. Clench & H. Turner,1964
Livonia roadnightae (F. McCoy, 1881)
Scaphella robusta (W.H. Dall, 1889)
Scaphella robusta marionae (H.A. Pilsbry& A.A. Olsson, 1953)
Scaphella robusta worki J. Coltro, 1998
Athleta rosavittoriae (H.A. Rehder, 1981)
Cymbiola rossiniana (M. Bernardi, 1859)
Athleta rouaulti (FOSSIL) A.E.M. Cossmann, 1923 †
Alcithoe rugosa (FOSSIL) (J. Marwick, 1926 †)
Liopeplum rugosum (FOSSIL) L.W. Stephenson, 1955 †
Fulgoraria rupestris (J.F. Gmelin, 1791)
Fulgoraria rupestris aurantia T. Shikama & S. Kosuge,1970
Fulgoraria rupestris thachi P. Bail & M. Chino, 2010
Lyria russjenseni W.K. Emerson, 1985
Cymbiola rutila (W.J. Broderip, 1826)
Cymbiola rutila ceraunia J.E. Gray, 1838
Cymbiola rutila macgillivrayi (J.C. Cox, 1873)
Cymbiola rutila norrisii J.E. Gray, 1838
Cymbiola rutila piperita (G.B. II Sowerby, 1845)
Cymbiola rutila rueckeri (J.C.H. Crosse, 1867)
Plicoliva ryalli P. Bouchet, 1989
Amoria ryosukei T. Habe, 1975
Lyria sabaensis P. Bail, 1993
Lyria sabulosa (FOSSIL) A.A. Olsson, 1928 †
Notovoluta saginata (FOSSIL) (Finlay, 1930 †)
Lyria samanaensis (FOSSIL) Cox, 1930 †