{"pk":48360,"title":"Newly described specimens of leptarctine mustelids expand their geographic range in the western United States","subtitle":null,"abstract":"<p><em>Leptarctus</em> is a morphologically distinctive carnivoran mammal occurring in Miocene deposits of North America and East Asia. In North American <em>Leptarctus</em> is mostly known from the Great Plains and Florida, but the single occurrence in China and recent description of well-preserved specimens in Oregon indicate that the western North American distribution of the genus is understudied. Here I document previously unreported specimens of <em>Leptarctus</em> and review other leptarctines housed in the collections of the University of California Museum of Paleontology (UCMP). Dental materials of at least four species of <em>Leptarctus</em> are present in the UCMP collections, encompassing occurrences from the Hemingfordian to Hemphillian North American Land Mammal Ages, adding to known records in the Great Plains, and expanding the paleogeographic range of <em>L. wortmani</em> into Nevada. Materials representing the genus in California are fragmentary but confirm the presence of<em> L. wortmani</em> in the Black Hawk Ranch locality in the coastal ranges of northern California, and <em>L. ancipidens</em> in the Cajon Valley in the southern Great Basin region of southern California.</p>","language":"eng","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":"Neogene"},{"word":"Mammalia"},{"word":"Nevada"},{"word":"Oregon"},{"word":"california"}],"section":"Article","is_remote":true,"remote_url":"https://escholarship.org/uc/item/4hv2z5nt","frozenauthors":[{"first_name":"Z. Jack","middle_name":"","last_name":"Tseng","name_suffix":"","institution":"","department":""}],"date_submitted":"2025-05-30T20:31:46.666000+02:00","date_accepted":"2025-09-25T22:52:11.297000+02:00","date_published":"2025-10-06T23:49:00+02:00","render_galley":null,"galleys":[{"label":"PDF","type":"pdf","path":"https://journalpub.escholarship.org/ucmp_paleobios/article/48360/galley/40039/download/"}]}