Megasurcula wynoocheensis (FOSSIL) (C.S. Weaver, 1912 †) Oregon, Coos bay, Astoria formation24 mm
Comitas wynyardensis (G.B. Pritchard, 1896) Australia
Otitoma xantholineata Morassi, Nappo& Bonfitto, 2017
Epidirona xanthophaes (R.B. Watson, 1886) Australia, Sydney
Crassispira xanti L.G. Hertlein& A.M. Strong, 1951 Sonora, Mexico20 mm
Leucosyrinx xenica (FOSSIL) W.P. Woodring, 1970 † Panama, Colón
Brachytoma yabei (FOSSIL) E.W. Vredenburg, 1921 † Myanmar, Magway, Thayetmyo
Comitas yokoyamai K. Oyama, 1954
Antiplanes yukiae (T. Shikama, 1962) Japan
Inquisitor zebra (J.B.P.A. Lamarck, 1822) Réunion10 mm
Pilsbryspira zebroides (H.C. Weinkauff& W. Kobelt, 1876) Panama13 mm
Inquisitor zonata (L.A. Reeve, 1843) Japan
Zonulispira zonulata (L.A. Reeve, 1842) Panama, Chiriqui Bay18 mm
Carinodrillia zooki (FOSSIL) (J. Brown& H.A. Pilsbry, 1911 †) Panama, Colón