Lasaea souverbiana M. Huber, 2015
Erycina speciosa (FOSSIL) L.C. Glenn, 1904 †
Macrodiceras spirale (FOSSIL) Karczewski, 1969 †
Lepton squamosum (Montague, 1803)
Parabornia squillina (K.J. Boss, 1965)
Neaeromya stearnsi W.H. Dall, 1899
Myllita stowei (F.W. Hutton, 1873)
Aligena striata (FOSSIL) Lea, 1843 †
Erycina striatissima (FOSSIL) S. Cerulli-Irelli, 1908 †
Neaeromya subquadrata (W.M. Gabb, 1872)
Erycina subradiata (A.A. Gould, 1861)
Squillaconcha subsinuata (C.E. Lischke, 1871)
Lepton subtrigonum J.G. Jeffreys in L. de Folin& J.P.L. Périer, 1873
Arculus sykesi (G.W. Chaster, 1895)
Planikellya symmetrica (FOSSIL) (G.P. Deshayes, 1858 †)
Borniola taieriensis (A.W.B. Powell, 1939)
Myllita tasmanica (J.E. Tenison-Woods,1875)
Scacchia tenera J.G. Jeffreys, 1881
Aligena texasiana H.W. Harry, 1969
Planikellya texta (FOSSIL) (A.E.M. Cossmann, 1887 †)
Planikellya translucida (FOSSIL) (J.B.P.A. Lamarck,1807 †)
Lepton transversarium (FOSSIL) A.E.M. Cossmann, 1896 †
Waldo trapezialis D.G. Zelaya & C.F. Ituarte,2002
Temblornia triangulata (FOSSIL) (F.M. Anderson& B. Martin, 1914 †)
Lepton trigonale R. Tate, 1879
Aligena trigonalis (P.P. Carpenter, 1857)
Diplodontina tumbesiana (W. Stempell, 1899)
Lasaea turtoni P. Bartsch, 1915
Lasaea undulata (A.A. Gould, 1861)
Lasaea undulata crassidens (FOSSIL) G.P. Deshayes, 1858 †
Planikellya undulata (FOSSIL) (J.B.P.A. Lamarck,1806 †)
Semeloidea uvasana (FOSSIL) (R.E. Dickerson, 1915 †)
Erycina vesicularis (FOSSIL) Recluz, 1844 †
Temblornia virgata (FOSSIL) (Gardner, 1942 †)
Myllitella vivens H.J. Finlay, 1926