Mandibles of Juvenile Phytosaurs (Archosauria: Crurotarsi) from the Upper Triassic Chinle Group of Texas and New Mexico, USA - InSPIRe Skip to main content InSPIRe @ Redlands Home About Help Contact Upload Search Sign In Article Mandibles of Juvenile Phytosaurs (Archosauria: Crurotarsi) from the Upper Triassic Chinle Group of Texas and New Mexico, USA Heckert, Andrew B (Appalachian State University) Jenkins, Hillary (Harvard University) Lucas, Spencer G (New Mexico Museum of Natural History & Science) Hunt, Adrian P (New Mexico Museum of Natural History & Science) 1 January 2013 Abstract Here we describe five specimens of juvenile phytosaurs from several localities in the Upper Triassic Chinle Group of Texas and New Mexico. These include three specimens from localities in the Tecovas Formation (Texas) of Adamanian age and one each from the Revueltian-age Bull Canyon Formation and Apachean-age Travesser Formation of New Mexico. Although all of the specimens are incompletely preserved mandibles, they are unquestionably phytosaurian based on their elongate mandibles with an extensive symphyseal region that is of essentially constant height and has at least some contribution from the splenial. We use the length (in mm) per preserved tooth socket as a proxy for ontogenetic stage, ranking the specimens from very young (similar to 4-6 mm/socket) to juvenile (similar to 9 mm/socket). There are distinct differences in tooth spacing, contribution of the splenial to the symphysis, angle of tooth eruption, and other features that vary in these specimens independent of age. This suggests that taxonomic information is available from the mandible pending further description and characterization of adult specimens of known taxa. Files This is a metadata-only record. Metrics Metadata Discipline Sciences, Technology & Mathematics Department Environmental Studies Publication title Bulletin of the New Mexico Museum of Natural History and Science Volume number 61 Page numbers 228-236 Keywords chinle group juvenile phytosaurs paleobiology paleontology teeth upper triassicView all (6) Download citation (RIS) Share this work Share on Facebook Share on Twitter Collections Our House Terms of Use Deposit Agreement Powered by Ubiquity Repositories
