This taxon is considered nomen dubium, species not entered
of the valid taxon Hadrosauridae
according to the Paleobiology Database.
See the page for Hadrosauridae →
Bibliography
Original description
E. D. Cope. 1869. [Remarks on Eschrichtius polyporus, Hypsibema crassicauda, Hadrosaurus tripos, and Polydectes biturgidus]. Proceedings of the Academy of Natural Sciences of Philadelphia 21:191-192