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The life history of these early branching taxa remains poorly understood, with only sparse investigations into their osteohistology, yet species like <jats:italic>Orthosuchus<\/jats:italic> have potential to inform about the macroevolution of growth strategies on the stem leading to crown crocodilians. In order to elucidate the growth patterns of <jats:italic>Orthosuchus<\/jats:italic>, we used propagation phase contrast X\u2010ray synchrotron micro\u2010computed tomography to virtually image the osteohistology of the postcrania of two specimens, including multiple elements from the type (SAM\u2010PK\u2010K409), and the femur of a referred specimen (BP\/1\/4242). In total, we scanned nine mid\u2010diaphyseal sections of the humerus, radius, ulna, radiale, femur, tibia, fibula, and a rib. We then compared our results to osteohistological sections of crocodylomorph taxa from the published literature. Our results show that the most predominant bone tissue type in <jats:italic>Orthosuchus<\/jats:italic> is lamellar, with a few patches of woven and parallel\u2010fibred bone. The type specimen contains four to five lines of arrested growth and the hindlimb elements present outer circumferential lamellae, whereas the referred specimen contains six to seven. Both specimens grew at similar rates, reaching adult skeletal body size at year four or five. The sectioned bones, most notably the radius and ulna, are comparatively thick walled and compact. Our virtual osteohistological sections are one of the first for an early branching crocodyliform, and the broad sample of skeletal elements makes <jats:italic>Orthosuchus<\/jats:italic> a key anchor point for understanding the plesiomorphic life history traits of the clade.<\/jats:p>","DOI":"10.1111\/joa.14166","type":"journal-article","created":{"date-parts":[[2024,10,28]],"date-time":"2024-10-28T02:20:41Z","timestamp":1730082041000},"page":"587-607","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The osteohistology of <i>Orthosuchus stormbergi<\/i> using synchrotron radiation microcomputed tomography"],"prefix":"10.1111","volume":"247","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5418-8470","authenticated-orcid":false,"given":"Bailey M.","family":"Weiss","sequence":"first","affiliation":[{"name":"Evolutionary Studies Institute University of the Witwatersrand  Johannesburg South Africa"},{"name":"School of 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