Ptychotrygon

Ptychotrygon is a species of Campanian fish whose fossils have been found in the Pen Formation of Big Bend National Park.^[1]

Footnotes

References

• Hunt, ReBecca K., Vincent L. Santucci and Jason Kenworthy. 2006. "A preliminary inventory of fossil fish from National Park Service units." in S.G. Lucas, J.A. Spielmann, P.M. Hester, J.P. Kenworthy, and V.L. Santucci (ed.s), Fossils from Federal Lands. New Mexico Museum of Natural History and Science Bulletin 34, pp. 63–69.