- Ryenella, Subgenus Musculus (Ryenella) J. Fleming, 1959 (MYTILIDAE)
- rykeli, Alvania rykeli H.J. Hoenselaar & J. Goud, 1998 - (RISSOIDAE)
- rynchonella, Anodonta rynchonella G. Servain, 1888 - syn of: Anodonta cygnea (C. Linnaeus, 1758) - (UNIONIDAE)
- rynchophorus, Leachia rynchophorus (A. de Rochebrune, 1884) - (CRANCHIIDAE)
- ryokuyomaruae, Falcidens ryokuyomaruae H. Saito & Salvini-Plawen, 2014 - (CHAETODERMATIDAE)
- ryosekiana, Nippononaia ryosekiana (M. Suzuki, 1941 †) - (NIPPONONAIIDAE) (FOSSIL)
- ryosukei, Chicoreus ryosukei T. Shikama, 1978 - (MURICIDAE)
- ryosukei, Inella ryosukei (S. Kosuge, 1963) - (TRIPHORIDAE)
- ryosukei, Amoria ryosukei T. Habe, 1975 - (VOLUTIDAE)
- ryosukei, Arctomelon stearnsii ryosukei T. Habe & K. Itô, 1965 - (VOLUTIDAE)
- rypara, Corbicula rypara P.M. Pallary, 1909 - syn of: Corbicula fluminalis (O.F. Müller, 1774) - (CYRENIDAE)
- rypara, Helix rypara J.R. Bourguignat, 1883 - syn of: Helix lucorum C. Linnaeus, 1758 - (HELICIDAE)
- ryrca, Hancockia ryrca Er. Marcus, 1957 - (HANCOCKIIDAE)
- Ryssota, Genus Ryssota J.A. Albers, 1850 (CHRONIDAE)
- ryssotitum, Caecum ryssotitum L. de Folin, 1867 - (CAECIDAE)
- ryssotitum caerulea, Caecum ryssotitum caerulea L. de Folin, 1867 - syn of: Caecum ryssotitum L. de Folin, 1867 - (CAECIDAE)
- ryssotitum cylindrica, Caecum ryssotitum cylindrica L. de Folin, 1870 - syn of: Caecum ryssotitum L. de Folin, 1867 - (CAECIDAE)
- Rytia, syn of: Genus Potomida W.J. Swainson, 1840 (UNIONIDAE)
- Ryugasella, Genus Ryugasella Wright & Matsumoto, 1954 † (AMMONOIDEA (unassigned)) (FOSSIL)
- ryukyuensis, Colus ryukyuensis T.C. Lan, 2002 - syn of: Euthria poppei K. Fraussen, 1999 - (BUCCINIDAE)
- ryukyuensis, Cirsochilus ryukyuensis F.S. MacNeil, 1960 † - (COLLONIIDAE) (FOSSIL)
- ryukyuensis, Hypermastus ryukyuensis H. Matsuda, D. Uyeno & K. Nagasawa, 2010 - (EULIMIDAE)
- ryukyuensis, Liotina ryukyuensis T. Habe, 1991 - syn of: Liotina peronii (R.W. Dunker, 1869) - (LIOTIIDAE)
- ryukyuensis, Patelloida ryukyuensis T. Nakano & T. Ozawa, 2005 - (LOTTIIDAE)
- ryukyuensis, Margarites ryukyuensis T.A. Okutani, T. Sasaki & E. Tsuchida, 2000 - (MARGARITIDAE)
- ryukyuensis, Chicoreus ryukyuensis T. Shikama, 1978 - (MURICIDAE)
- ryukyuensis, Elysiobranchus ryukyuensis M. Ichikawa, 1993 - (PLAKOBRANCHIDAE)
- ryukyuensis, Cyclopecten ryukyuensis I. Hayami & T. Kase, 1993 - (PROPEAMUSSIIDAE)
- ryukyuensis, Pyropelta ryukyuensis T. Sasaki, T.A. Okutani & K. Fujikura, 2008 - (PYROPELTIDAE)
- ryukyuensis, Daphnella ryukyuensis F.S. MacNeil, 1960 † - (RAPHITOMIDAE) (FOSSIL)
- ryukyuensis, Pleurotomella ryukyuensis F.S. MacNeil, 1960 † - (RAPHITOMIDAE) (FOSSIL)
- ryukyuensis, Heteroteuthis ryukyuensis T. Kubodera, T.A. Okutani & S. Kosuge, 2009 - (SEPIOLIDAE)
- ryukyuensis, Gemmula granosa ryukyuensis F.S. MacNeil, 1960 † - (TURRIDAE) (FOSSIL)
- rzehaki, Staliopsis rzehaki (W.A. Wenz, 1925 †) - (AMNICOLIDAE) (FOSSIL)
- Rzehakia, Genus Rzehakia Korobkov, 1954 † (CARDIIDA (unassigned)) (FOSSIL)
- RZEHAKIIDAE - syn of Family: VENERIDAE
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