Cancellaria yolandia (FOSSIL) H.A. Pilsbry& A.A. Olsson, 1941 †
Cancellaria yonabaruensis (FOSSIL) F.S. MacNeil, 1960 †
Sveltia yoyottei R.E. Petit& M.G. Harasewych, 1990
Sveltia zahni (FOSSIL) Böse, 1910 †
Admetula zalayana (FOSSIL) P.O. Jung & R.E. Petit,1990 †
Admetula zapoteca (FOSSIL) Böse, 1910 †