Golvan, Y.J. & Gracia-Rodrigo, A. & Diaz-Ungria, C. (1964)
[Megapriapus ungriai (GRACIA-RODRIGO 1960) n. gen. (Palaeacanthocephala) parasite of a venezuelan fresh water sting-ray (Potamotrygon hystrix)]. Annales de Parasitologie Humaine et Comparée, 39, 53–59

de Marques, F.P. (2000)
Evolution of Neotropical freshwater stingrays and their parasites: taking into account space and time. Unpublished PhD dissertation, University of Toronto, Toronto.

de Marques, F.P. (2000)
Evolution of Neotropical freshwater stingrays and their parasites: taking into account space and time. Unpublished PhD dissertation, University of Toronto, Toronto.

Thatcher, V.E. (2006)
Amazon Fish Parasites (Second edition). Volume 1. Aquatic Biodiversity in Latin America, 1, PENSOFT Publishers, Sofia, 508pp