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Temporal range: Cretaceous
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Order: Testudines
Family: Protostegidae
Genus: Pneumatoarthrus
Binomial name
Pneumatoarthrus peloreus
Cope, 1870

Pneumatoarthrus is a Cretaceous sea turtle first identified by Edward Drinker Cope as a hadrosaur in 1870. The fossils were found in the chalk beds of Kansas. It may be synonymous with the better-known Atlantochelys, and therefore a close relative of the giant sea turtle Archelon.


Baird, D., 1978. "Pneumatoarthrus Cope, 1870, not a dinosaur but a sea-turtle". Proceedings of the Academy of Natural Sciences, Philadelphia, 129(4):71-81.