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Grünwald, C.I.; Jones, J.M.; Franz-Chávez, H.; Ahumada-Carrillo, I.T. 2015 A new species of Ophryacus (Serpentes: Viperidae: Crotalinae) from eastern Mexico, with comments on the taxonomy of related pitvipers. Mesoamerican Herpetology 2(4): 388-416.