World Register of Marine Species (WoRMS)
MolluscaBase eds. (2026). MolluscaBase. Ptychatractidae W. Stimpson, 1865. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=411810 on 2026-08-02
Stimpson, W. (1865). On certain genera and families of zoophagous gasteropods. American Journal of Conchology. 1: 55-64, pl. 8-9.
Stephenson, L. W. (1941). The larger invertebrate fossils of the Navarro Group of Texas (exclusive of corals and crustaceans and exclusive of the fauna of the Escondido Formation). The University of Texas Publication. 4101: 1-641.