Volutaxis scalella (E.C. Von Martens, 1898)
Streptostyla shuttleworthi (L. Pfeiffer, 1856)
Miraradula similaris (H. Strebel, 1882)
Euglandina singleyana W.G. Binney, 1892
Streptostyla sololensis J.C.H. Crosse& P.H. Fischer, 1869
Euglandina sowerbyana (L. Pfeiffer, 1846)
Proameria speciosa (L. Pfeiffer, 1856)
Pseudosubulina splendens F.G. Thompson, 1959
Guillarmodia stenotrema (F.G. Thompson, 1995)
Varicoglandina stigmatica (R.J. Shuttleworth, 1852)
Mayaxis stolli (E.C. Von Martens, 1898)
Volutaxis strebeli (H.A. Pilsbry, 1907)
Streptostyla streptostyla (L. Pfeiffer, 1846)
Euglandina striata (O.F. Müller, 1774)
Euglandina striata striatula J.H. Vernhout, 1914
Spiraxis subcretaxis (H.A. Pilsbry, 1930)
Versutaxis subgranum (H.B. Baker, 1939)
Rectaxis subnitidus (H.B. Baker, 1939)
Versutaxis subopeas (H.B. Baker, 1939)
Volutaxis subrectaxis H.A. Pilsbry
Rectaxis subtilis (H.B. Baker, 1939)
Volutaxis subulinus (H.B. Baker, 1940)
Euglandina subvaricosa (J.A. Albers, 1854)
Proameria sulcifera (E.C. Von Martens, 1891)
Volutaxis sulciferus (P.M.A. Morelet, 1851)
Streptostyla sumichrasti C.M.F. Ancey, 1903
Streptostyla supracostata (H.A. Pilsbry, 1909)
Euglandina surinamensis J.H. Vernhout, 1914
Pseudosubulina tastensis (J.G. Cooper, 1894)
Euglandina tenella (H. Strebel, 1875)
Volutaxis tenuecostatus H. Strebel, 1882
Volutaxis tenuis (L. Pfeiffer, 1868)
Proameria tepicensis (H.A. Pilsbry& T.D.A. Cockerell, 1926)
Spiraxis terebella (C.B. Adams, 1849)
Euglandina texasiana (L. Pfeiffer, 1857)