Tripoplax regularis (P.P. Carpenter, 1855)
Ischnochiton resplendens W.T. Bednall& E.H. Matthews, 1906
Lepidozona retiporosa (P.P. Carpenter, 1864)
Ischnochiton rhodolithophilus K.B. Clark, 2000
Ischnochiton rissoi Angelo & C. Smriglio,1999
Stenosemus robustus (P. Kaas, 1991)
Connexochiton roccai (FOSSIL) Dell'Angelo & al., 2013 †
Ischnochiton roseus (G.B. I Sowerby, 1832)
Lepidozona rothi A. Ferreira, 1983
Stenoplax rugulata (G.B. I Sowerby, 1832)
Ischnochiton sanctaemonicae (FOSSIL) S.S. Berry, 1911 †
Ischnochiton sansibarensis K.H.J. Thiele, 1909
Lepidozona scabricostata (P.P. Carpenter, 1864)
Lepidozona scrobiculata (A.T. von Middendorff,1847)
Ischnochiton sculptus (G.B. Sowerby, 1840)
Ischnochiton sererorum (A. de Rochebrune, 1881)
Lepidozona serrata (P.P. Carpenter, 1864)
Lepidozona shalini J.R.M. Bergenhayn, 1933
Stenosemus sharpii (H.A. Pilsbry, 1896)
Stenosemus simplicissimus (K.H.J. Thiele, 1906)
Ischnochiton sirenkoi B. Dell'Angelo, G. Prelle, M. Sosso& A. Bonfitto, 2011
Lepidozona sirenkoi P. Kaas & R.A. Van Belle,1990
Lepidozona skoglundi (A. Ferreira, 1986)
Ischnochiton smaragdinus (G.F. Angas, 1867)
Stenosemus solomonensis Sirenko, 2017
Stenoplax sonorana S.S. Berry, 1956
Lepidozona sorsogonensis P. Kaas & R.A. Van Belle,1987
Stenosemus stearnsii (W.H. Dall, 1902)
Lepidozona stohleri A. Ferreira, 1985
Ischnochiton stramineus (G.B. I Sowerby in W.J. Broderip& G.B. I Sowerby, 1832)
Ischnochiton striolatus (J.E. Gray, 1828)
Stenosemus substriatus (P. Kaas & R.A. Van Belle,1990)
Lepidozona subtilis S.S. Berry, 1956
Ischnochiton subviridis (T. Iredale & W.L. May,1916)
Ischnochiton tateanus W.T. Bednall, 1897