Ptychotrygon

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

Footnotes

↑ "Big Bend National Park," Hunt, Santucci, and Kenworthy (2006); page 65.

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.

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