{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T04:47:55Z","timestamp":1790484475950,"version":"4.1.0"},"reference-count":85,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2020,11,26]],"date-time":"2020-11-26T00:00:00Z","timestamp":1606348800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Genet."],"abstract":"<jats:p>\n                    Members of the Chondrichthyes (Elasmobranchii and Holocephali) are distinguished by their largely cartilaginous endoskeletons, which comprise an uncalcified core overlain by a mineralized layer; in the Elasmobranchii (sharks, skates, rays) most of this mineralization takes the form of calcified polygonal tiles known as tesserae. In recent years, these skeletal tissues have been described in ever increasing detail in sharks and rays, but those of Holocephali (chimaeroids) have been less well-studied, with conflicting accounts as to whether or not tesserae are present. During embryonic ontogeny in holocephalans, cervical vertebrae fuse to form a structure called the synarcual. The synarcual mineralizes early and progressively, anteroposteriorly and dorsoventrally, and therefore presents a good skeletal structure in which to observe mineralized tissues in this group. Here, we describe the development and mineralization of the synarcual in an adult and stage 36 elephant shark embryo (\n                    <jats:italic>Callorhinchus milii<\/jats:italic>\n                    ). Small, discrete, but irregular blocks of cortical mineralization are present in stage 36, similar to what has been described recently in embryos of other chimaeroid taxa such as\n                    <jats:italic>Hydrolagus<\/jats:italic>\n                    , while in\n                    <jats:italic>Callorhinchus<\/jats:italic>\n                    adults, the blocks of mineralization are more irregular, but remain small. This differs from fossil members of the holocephalan crown group (\n                    <jats:italic>Edaphodon<\/jats:italic>\n                    ), as well as from stem group holocephalans (e.g., Symmorida,\n                    <jats:italic>Helodus<\/jats:italic>\n                    , Iniopterygiformes), where tesserae are notably larger than in\n                    <jats:italic>Callorhinchus<\/jats:italic>\n                    and show similarities to elasmobranch tesserae, for example with respect to polygonal shape.\n                  <\/jats:p>","DOI":"10.3389\/fgene.2020.571694","type":"journal-article","created":{"date-parts":[[2020,11,26]],"date-time":"2020-11-26T02:24:26Z","timestamp":1606357466000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":31,"title":["Mineralization of the Callorhinchus Vertebral Column (Holocephali; Chondrichthyes)"],"prefix":"10.3389","volume":"11","author":[{"given":"Jacob B.","family":"Pears","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zerina","family":"Johanson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kate","family":"Trinajstic","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mason N.","family":"Dean","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Catherine A.","family":"Boisvert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2020,11,26]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"424","DOI":"10.1016\/j.actbio.2018.11.047","article-title":"Bone-like features in skate suggest a novel elasmobranch synapomorphy and deep homology of trabecular mineralization patterns.","volume":"84","author":"Atake","year":"2019","journal-title":"Acta Biomater."},{"key":"B2","doi-asserted-by":"publisher","first-page":"966","DOI":"10.1111\/j.1095-8649.2012.03242.x","article-title":"An overview on the role of Hexanchiformes in marine ecosystems: biology, ecology and conservation status of a primitive order of modern sharks.","volume":"80","author":"Barnett","year":"2012","journal-title":"J. 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