Chepultapecia allosa X.-D. Qiao, 1983 † (uncertain > unassessed )
Chepultapecia leiosomella (Sardeson, 1896) † (uncertain > unassessed )
Chepultapecia teretiuscula X.-D. Qiao, 1983 † (uncertain > unassessed )
Chepultapecia toksunensis X.-D. Qiao, 1983 † (uncertain > unassessed )
Platyschisma branxtonensis Fletcher, 1958 †
Platyschisma depressa Weller, 1900 †
Platyschisma helicoides (J. De C. Sowerby, 1826) †
Platyschisma laudoni Rollins, 1975 †
Platyschisma lingua Yoo, 1994 †
Platyschisma mccoyi Walcott, 1884 † accepted as Orecopia mccoyi (Walcott, 1884) †
Platyschisma rotundatum F. Morris, 1845 †
Platyschisma vitrea Yoo, 1994 †
Sinuopea strongi (Whitfield, 1878) † accepted as Euomphalus strongi Whitfield, 1878 †
Sinuopea sweeti (Whitfield, 1880) †