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In the Late Triassic, some members of this group increased in body size relative to other cynodont lineages and evolved postcranial adaptations associated with locomotion. The Late Triassic\n                    <jats:italic>Siriusgnathus niemeyerorum<\/jats:italic>\n                    is one such traversodontid. Originally described in 2018 based on cranial material, the species has since been the focus of considerable advances in our understanding of its skull anatomy; however, its postcranial skeleton remains undescribed. The present study examined the postcranial osteology of this traversodontid, focusing on the pectoral girdle and forelimb of the specimen CAPPA\/UFSM 0109, paratype of the species. These remains show that\n                    <jats:italic>Si. niemeyerorum<\/jats:italic>\n                    presents a scapulocoracoid with concave anterior and posterior margins and a lateroventrally oriented glenoid fossa formed by the scapula and coracoid; a humerus with a short diaphysis and a broadly open deltopectoral crest; an ulna with a developed olecranon process; and a manus with a phalangeal formula of 2\u20103\u20103\u20103\u20103. One of the distal carpals (dc1) is greatly elongated and morphologically similar to a metacarpal, a feature observed in some gomphodonts. The combination of traits present in the scapulocoracoid (glenoid) and the robustness of the humerus suggests a lateralized (\u201csprawling\u201d) forelimb posture in\n                    <jats:italic>Si. niemeyerorum<\/jats:italic>\n                    , similar to that inferred for\n                    <jats:italic>Exaeretodon argentinus<\/jats:italic>\n                    and\n                    <jats:italic>Exaeretodon riograndensis<\/jats:italic>\n                    . In summary, this study expands current knowledge of traversodontid postcranial anatomy and provides new insights into the locomotor adaptations among non\u2010mammaliaform cynodonts.\n                  <\/jats:p>","DOI":"10.1002\/ar.70289","type":"journal-article","created":{"date-parts":[[2026,8,8]],"date-time":"2026-08-08T09:11:57Z","timestamp":1786180317000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Osteology of the pectoral girdle and forelimb of\n                    <i>Siriusgnathus niemeyerorum<\/i>\n                    , a Late Triassic traversodontid cynodont from Brazil"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-3984-7700","authenticated-orcid":false,"given":"Jhonata H. 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