ammonites
Peritresius Cope 1870 (turtle)

Reptilia - Testudines - Toxochelyidae

Full reference: E. D. Cope. 1870. Synopsis of the extinct Batrachia, Reptilia and Aves of North America. Transactions of the American Philosophical Society, New Series 14(1):1-252

Parent taxon: Lophocheliinae according to R. E. Weems 1988

Sister taxa: Ctenochelys, Lophochelys, Neurochelys, Oertelia, Prionochelys

Subtaxa: Peritresius ornatus

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Ecology: aquatic omnivore