{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,31]],"date-time":"2025-08-31T10:01:04Z","timestamp":1756634464058,"version":"3.44.0"},"reference-count":112,"publisher":"Wiley","issue":"3-4","license":[{"start":{"date-parts":[[2024,11,5]],"date-time":"2024-11-05T00:00:00Z","timestamp":1730764800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004359","name":"Vetenskapsr\u00e5det","doi-asserted-by":"publisher","award":["2015\u201004335","2019\u201004595"],"award-info":[{"award-number":["2015\u201004335","2019\u201004595"]}],"id":[{"id":"10.13039\/501100004359","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Anatomy"],"published-print":{"date-parts":[[2025,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Ankylosaurs were a group of heavily armored non\u2010avian dinosaurs (Dinosauria, Ankylosauria), represented by a relatively abundant fossil record from the Cretaceous of North and South America. Their dermal skeleton was characterized by large osteoderms whose development and functional role have been largely investigated. However, interstitial small ossicles, forming between these osteoderms, have been far more overlooked and it remains unknown whether they were formed through the ossification of a preexisting fibrous matrix of connective tissue (i.e., metaplasia) or by a cell\u2010induced differentiation of new fiber bundles followed by mineralization (i.e., neoplasia sensu (Zeitschrift f\u00fcr Wissenschaftliche Zoologie, 1858, 9, 147)). Here, we propose a hypothesis on the developmental origin of these small ossicles in the ankylosaurian <jats:italic>Antarctopelta oliveroi<\/jats:italic> using light microcopy, scanning electron microscopy and three\u2010dimensional virtual histology through propagation phase\u2010contrast synchrotron radiation micro\u2010computed tomography (PPC\u2010SR\u03bcCT). Ossicles are located in the dermis. They are composed of two layers: (1) a thin external layer, and (2) a thick basal plate, composed of collagen fiber bundles, which forms the main part of the ossicle. The external layer is made of a smooth, vitreous mineralized tissue that does not look like bone. The basal plate, however, is of osseous origin. In this basal plate, the collagen fiber bundles are organized in two orthogonal systems: one horizontal\u2014observable in cross\u2010sections\u2014and one vertical\u2014observable in the primary plane of sections sensu (Journal of Vertebrate Paleontology, 2004, 24, 874). The horizontal system is itself composed of successive layers of collagen fiber bundles arranged into an orthogonal plywood\u2010like structure. The bundles of the vertical system radiate from the center of the ossicle at the level of the transition between the external layer and the basal plate and run towards the periphery of the basal plate. Their thickness increases from the center of the ossicle towards its periphery. Numerous bundles of the vertical system form thin threads that interweave and penetrate within the thick bundles of the horizontal system. Our new data suggest that the ossicles were at least partially formed by metaplasia, that is, through the ossification of a preexisting fibrous matrix of connective tissue. This process was probably supplemented by a cell\u2010induced differentiation of new fiber bundles laid down prior to their incorporation into the fibrous system and its mineralization. This process looks more akin to neoplasia sensu (Zeitschrift f\u00fcr Wissenschaftliche Zoologie, 1858, 9, 147) than to metaplasia. Consequently, metaplastic and neoplastic processes may coexist in these ossicles with a possible differential expression during ontogeny.<\/jats:p>","DOI":"10.1111\/joa.14159","type":"journal-article","created":{"date-parts":[[2024,11,5]],"date-time":"2024-11-05T04:18:06Z","timestamp":1730780286000},"page":"665-681","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Microstructure and development of the dermal ossicles of <i>Antarctopelta oliveroi<\/i> (Dinosauria, Ankylosauria): A complex morphogenetic system deciphered through three\u2010dimensional X\u2010ray microtomography"],"prefix":"10.1111","volume":"247","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3611-6836","authenticated-orcid":false,"given":"Sophie","family":"Sanchez","sequence":"first","affiliation":[{"name":"Department of Organismal Biology, Subdepartment of Evolution and Development Uppsala University  Uppsala Sweden"},{"name":"European 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