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| TITLE: | The first discovery of a rhynchosaur from the upper Moenkopi Formation (Middle Triassic) of northern Arizona
| | AUTHOR: | Sterling J. Nesbitt and Robin L. Whatley
| | JOURNAL: | PaleoBios
| | PUBLISHED: | Dec 22, 2004
| | NOTES: | 24(3)
| | ABSTRACT: | Ammorhynchus navajoi gen. et sp. nov. (Archosauromorpha: Rhynchosauria) is described from a nearly complete left maxilla and additional dental elements from lower Middle Triassic (Lower Anisian) deposits of the Moenkopi Formation of Arizona. The single maxillary groove present in Ammorhynchus navajoi gen. et sp. nov. occurs in some species of the Middle Triassic genus Rhynchosaurus, but is consistently present in Late Triassic forms of the genus Hyperodapedon, and is typical of all other North American rhynchosaurs. The presence of the single maxillary groove, in combination with well-developed maxillary lingual teeth and a low occlusal tooth row count, suggests that this is the plesiomorphic condition in all rhynchosaurs with blade and groove occlusion. Ammorhynchus navajoi gen. gen. et sp. nov. is the first rhynchosaur reported from the Moenkopi Formation (Holbrook Member), and is the earliest rhynchosaur known from the Americas.
| | COLLECTION: | PaleoBios Archive Public
| | ID: | 237
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