{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,2]],"date-time":"2025-08-02T14:38:08Z","timestamp":1754145488159,"version":"3.41.2"},"reference-count":38,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2025,4,19]],"date-time":"2025-04-19T00:00:00Z","timestamp":1745020800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Anatomy"],"published-print":{"date-parts":[[2025,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>In contrast to other cartilaginous fishes (Chondrichthyes), the dentition of the Holocephali consists of six dental plates, four in the upper jaw (two vomerines and two palatines) and two in the lower jaw (mandibulars). While the microstructure of holocephalan dentition has been extensively studied in extant species, similar analyses in fossil taxa are less common. Here, we provide a detailed description and interpretation of the microanatomy and histology of dental plates of the extinct taxon \u2020<jats:italic>Ischyodus dolloi<\/jats:italic> Leriche (Chimaeriformes: \u2018Edaphodontidae\u2019). The study is based on two palatine and two mandibular plates from the Eocene of the Antarctic Peninsula. Our main objectives were to (1) identify the presence and distribution of different tissues; (2) analyze morphological diversity in hypermineralized structures (i.e., tritors) within the dental plates; (3) compare the microanatomy and histology of \u2020<jats:italic>I. dolloi<\/jats:italic> with other living and fossil holocephalans; and (4) infer the sequence and mode of tissue formation within the plates. The dental plates are composed of an outer shell enclosing a framework of trabecular dentine, in which hypermineralized dentine (i.e., whitlockin) is deposited to form the tritors. Trabecular dentine becomes compacted by centripetal deposition of circumvascular dentine around vascular canals. The tritors exhibit two morphological types: tritoral rods (first report for \u2018Edaphodontidae\u2019) and tritoral pads. Additionally, a distinct tissue, which we term \u2018parallelitubular dentine\u2019, is formed in the aboral and symphyseal regions. Regarding the growth of dental plates, we identified a developmental pattern in which the full formation of tritors and complete compaction of trabecular dentine follows a mesial\u2010to\u2010lingual, oral\u2010to\u2010aboral, and labial\u2010to\u2010symphyseal sequence. This growth pattern aligns with the spatial order in which the dentinal tissues are progressively removed due to feeding\u2010related wear.<\/jats:p>","DOI":"10.1111\/joa.14257","type":"journal-article","created":{"date-parts":[[2025,4,19]],"date-time":"2025-04-19T06:51:01Z","timestamp":1745045461000},"page":"201-222","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dental plate histology of \u2020<i>Ischyodus dolloi<\/i> (Chondrichthyes, Holocephali), from Antarctica"],"prefix":"10.1111","volume":"247","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6279-0392","authenticated-orcid":false,"given":"Ignacio","family":"Cerda","sequence":"first","affiliation":[{"name":"Consejo Nacional de Investigaci\u00f3n Ciencia y T\u00e9cnica (CONICET)  Buenos Aires Argentina"},{"name":"Instituto de Investigaci\u00f3n en Paleobiolog\u00eda y Geolog\u00eda (IIPG) Universidad Nacional de R\u00edo Negro (UNRN), Museo Carlos Ameghino, Belgrano 1700, Paraje Pichi Ruca (Predio Marabunta)  Cipolletti R\u00edo Negro Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Soledad Gouiric","family":"Cavalli","sequence":"additional","affiliation":[{"name":"Consejo Nacional de Investigaci\u00f3n Ciencia y T\u00e9cnica (CONICET)  Buenos Aires Argentina"},{"name":"Divisi\u03ccn Paleontolog\u00eda Vertebrados Museo de La Plata  La Plata Buenos Aires Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marcelo A.","family":"Reguero","sequence":"additional","affiliation":[{"name":"Divisi\u03ccn Paleontolog\u00eda Vertebrados Museo de La Plata  La Plata Buenos Aires Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,4,19]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-61779-977-8_11"},{"volume-title":"The teeth of non\u2010mammalian vertebrates","year":"2017","author":"Berkovitz B.K.","key":"e_1_2_9_3_1"},{"key":"e_1_2_9_4_1","first-page":"3","volume-title":"Structural and Chemical Organization of Teeth","author":"Bradford E.W.","year":"1967"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.5710\/PEAPA.07.04.2020.314"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.crpv.2004.07.007"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1039\/b708985f"},{"key":"e_1_2_9_8_1","first-page":"1","article-title":"Phylogenetic systematics of extant chimaeroid fishes (Holocephali, Chimaeroidei)","volume":"3119","author":"Didier D.A.","year":"1995","journal-title":"American Museum Novitates"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.1052220108"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.10501"},{"key":"e_1_2_9_11_1","first-page":"113","article-title":"A review of Antarctic ichthyofaunas in the light of new fossil discoveries","volume":"29","author":"Grande L.","year":"1986","journal-title":"Pal\u00e9o"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598\u2010020\u201075545\u20100"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1679\/aohc.47.89"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-4-431-68132-8_72"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41598\u2010019\u201046081\u20103"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1111\/joa.13445"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1093\/icb\/icaa093"},{"key":"e_1_2_9_18_1","first-page":"205","volume-title":"Ancient fishes and their living relatives: a tribute to John G. 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