{"pk":41784,"title":"A new aetosaur (Archosauria: Pseudosuchia) from the upper Blue Mesa Member (Adamanian: Early–Mid Norian) of the Late Triassic Chinle Formation,  northern Arizona, USA, and a review of the paratypothoracin \nTecovasuchus\n across the southwestern USA","subtitle":null,"abstract":"The Late Triassic Chinle Formation in northern Arizona and Dockum Group in northwestern Texas preserve a high aetosaur biodiversity within the Adamanian teilzone, including \nDesmatosuchus spurensis\n, \nDesmatosuchus smalli\n, \nCalyptosuchus wellesi\n, \nAdamanasuchus eisenhardtae\n, \nTypothorax coccinarum\n, \nParatypothorax\n sp., \nTecovasuchus chatterjeei\n, and \nSierritasuchus macalpini\n. Here, we present a new aetosaur \nKryphioparma caerula \ngen. et sp. nov\n.\n from the upper Blue Mesa Member of the Chinle Formation, Adamanian teilzone, in northern Arizona. \nKryphioparma caerula \nsp. nov\n.\n is documented based on several isolated osteoderms collected from the \nPlacerias\n Quarry and Petrified Forest National Park. Although fragmentary, it is evident that the paramedian osteoderms of \nKr. caerula\n exhibit a dorsal ornamentation composed of large, randomly oriented oblong pits; a low concentration of pits relative to available surface area; well-developed anterior bar; a probable high width-to-length ratio; dorsoventrally thickened; well-developed ventral strut; and grooves along the posterior margin. This suite of morphological characters indicates that \nKr. caerula\n is a typothoracine similar to \nTy. coccinarum\n, \nTe. chatterjeei\n, and \nP. andressorum\n; its stratigraphic occurrence within the upper Blue Mesa Member makes it the oldest documented typothoracine to date. The documentation of \nKr. caerula\n within the \nPlacerias\n Quarry brings to question the taxonomic affinities of paratypothoracin material identified as “\nTecovasuchus\n” by previous authors, as well as the biostratigraphic utility of \nTe. chatterjeei \nacross the southwestern United States. We present the first unambiguous material referable to \nTe. chatterjeei\n from the Downs Quarry and Petrified Forest National Park. The documentation of \nTe. chatterjeei\n in the Chinle Formation of northern Arizona and Tecovas Formation of northwestern Texas suggests that this taxon may be biostratigraphically informative as it is currently constrained to strata within the Adamanian teilzone similar to \nDesmatosuchus\n and \nCa. wellesi\n.","language":"en","license":{"name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0","short_name":"CC BY-NC-SA 4.0","text":"<p><!-- x-tinymce/html --></p>\n<p>Readers are free to:</p>\n<ul>\n<li><strong>Share</strong> — copy and redistribute the material in any medium or format</li>\n<li><strong>Adapt</strong> — remix, transform, and build upon the material<br><br>The licensor cannot revoke these freedoms as long as you follow the license terms.</li>\n</ul>\n<p>Under the following terms:</p>\n<ul>\n<li><strong>Attribution</strong> — You must give appropriate credit , provide a link to the license, and indicate if changes were made . You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.</li>\n<li><strong>NonCommercial</strong> — You may not use the material for commercial purposes .</li>\n<li><strong>ShareAlike</strong> — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.<br><br>No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.</li>\n</ul>\n<p>Notices:</p>\n<p>You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.</p>\n<p>No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.</p>","url":"https://creativecommons.org/licenses/by-nc-sa/4.0"},"keywords":[{"word":"Aetosauria, Chinle Formation, Triassic, Placerias Quarry"}],"section":"Article","is_remote":true,"remote_url":"https://escholarship.org/uc/item/6q35k21s","frozenauthors":[{"first_name":"William","middle_name":"A.","last_name":"Reyes","name_suffix":"","institution":"The University of Texas at Austin, Jackson School of Geosciences, 23 San Jacinto Blvd, Austin, Texas, 78712, USA; Petrified Forest National Park, Petrified Forest, Department of Resource Management and Science, 1 Park Road #2217, Petrified Forest National Park, Arizona, 86028, USA","department":"None"},{"first_name":"William","middle_name":"G.","last_name":"Parker","name_suffix":"","institution":"The University of Texas at Austin, Jackson School of Geosciences, 23 San Jacinto Blvd, Austin, Texas, 78712, USA; Petrified Forest National Park, Petrified Forest, Department of Resource Management and Science, 1 Park Road #2217, Petrified Forest National Park, Arizona, 86028, USA; Museum of Northern Arizona, 3101 N. Fort Valley Rd., Flagstaff, Arizona, 86001, USA","department":"None"},{"first_name":"Andrew","middle_name":"B.","last_name":"Heckert","name_suffix":"","institution":"Department of Geological & Environmental Sciences, Appalachian State University, ASU Box 32067, Boone, North Carolina, 28607, USA;North Carolina Museum of Natural Sciences, 11 W. Jones St., Raleigh, North Carolina, 27601, USA","department":"None"}],"date_submitted":"2023-07-18T01:18:24+05:30","date_accepted":"2023-07-18T01:18:24+05:30","date_published":"2023-07-17T12:30:00+05:30","render_galley":null,"galleys":[{"label":"","type":"pdf","path":"https://journalpub.escholarship.org/ucmp_paleobios/article/41784/galley/31239/download/"}]}