Tripoplax regularis (P.P. Carpenter, 1855) California
Ischnochiton resplendens W.T. Bednall& E.H. Matthews, 1906 Western Australia, Yallingup20 mm
Lepidozona retiporosa (P.P. Carpenter, 1864) Canada, British Columbia
Ischnochiton rhodolithophilus K.B. Clark, 2000 Mexico, Baja California Sur, La Paz
Ischnochiton rissoi Angelo & C. Smriglio,1999 Italy, Siracusa24 mm
Stenosemus robustus (P. Kaas, 1991) New Caledonia, Grand Recife Sud24 mm
Connexochiton roccai (FOSSIL) Dell'Angelo & al., 2013 † Italy
Ischnochiton roseus (G.B. I Sowerby, 1832)
Lepidozona rothi A. Ferreira, 1983 Mexico, Baja California
Stenoplax rugulata (G.B. I Sowerby, 1832) Ecuador19 mm
Ischnochiton sanctaemonicae (FOSSIL) S.S. Berry, 1911 † California, Monterey Bay
Ischnochiton sansibarensis K.H.J. Thiele, 1909 Tanzania
Lepidozona scabricostata (P.P. Carpenter, 1864) Mexico, Acapulco
Lepidozona scrobiculata (A.T. von Middendorff,1847) California, Monterey Bay25 mm
Ischnochiton sculptus (G.B. Sowerby, 1840)
Ischnochiton sererorum (A. de Rochebrune, 1881) Senegal, Dakar
Lepidozona serrata (P.P. Carpenter, 1864) Mexico, Baja California Sur, La Paz
Lepidozona shalini J.R.M. Bergenhayn, 1933
Stenosemus sharpii (H.A. Pilsbry, 1896) Aleutian Islands, Buldir Island
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) Mexico
Ischnochiton smaragdinus (G.F. Angas, 1867) Bahamas11 mm
Stenosemus solomonensis Sirenko, 2017
Stenoplax sonorana S.S. Berry, 1956 Mexico, Sonora39 mm
Lepidozona sorsogonensis P. Kaas & R.A. Van Belle,1987
Stenosemus stearnsii (W.H. Dall, 1902)
Lepidozona stohleri A. Ferreira, 1985 Mexico, Baja California
Ischnochiton stramineus (G.B. I Sowerby in W.J. Broderip& G.B. I Sowerby, 1832)
Ischnochiton striolatus (J.E. Gray, 1828) Barbados13 mm
Stenosemus substriatus (P. Kaas& R.A. Van Belle, 1990)
Lepidozona subtilis S.S. Berry, 1956 Mexico
Ischnochiton subviridis (T. Iredale & W.L. May,1916) Tasmania, Port Arthur25 mm
Ischnochiton tateanus W.T. Bednall, 1897 South Australia