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The teeth of both taxa display a system of vascular canals penetrating the dentine and the overlying hypermineralized acrodin cap; small tubules are radiating at an angle to the long axis of the canals, interpreted as residual spaces left by odontoblast cell processes. This is the first detailed account of vascular acrodin encountered in a pycnodont species. New information is revealed also about <jats:italic>Sargodon<\/jats:italic> dental histology in the shape of mineralized remnants of the basal lamina at the acrodin\u2013dentine junction. This implies that deposition of the acrodin organic matrix proceeded centrifugally by the cells of the inner dental epithelium, probably with minor collagen contribution from odontoblasts. This is contrary to the more typical centripetal formation (beneath the basal lamina) of the acrodin layer implied for the studied pycnodontid teeth. The rare occurrences of vascular acrodin within Actinopterygii, and the demonstrated differences in its histogenesis, do not suggest the usefulness of the tissue as systematic character but rather point to its adaptive significance. The superficial increase in the order of acrodin bundle orientation, observed in both species, is similarly regarded as convergently acquired mechanical adaptation. The observed uneven shape of crystallite rows and lesser degree of mineralization of the inner collariform ganoin, compared to its outer portion, is indicative of epithelial\u2010ectomesenchymal interaction and qualifies the tissue as enameloid. Microsc. Res. Tech., 2011. \u00a9 2010 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/jemt.20932","type":"journal-article","created":{"date-parts":[[2010,9,10]],"date-time":"2010-09-10T11:54:59Z","timestamp":1284119699000},"page":"464-479","source":"Crossref","is-referenced-by-count":7,"title":["Convergence in dental histology between the late Triassic semionotiform <i>Sargodon tomicus<\/i> (Neopterygii) and a late cretaceous (Turonian) pycnodontid (Neopterygii: Pycnodontiformes) species"],"prefix":"10.1002","volume":"74","author":[{"given":"Plamen Stanislavov","family":"Andreev","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2010,9,10]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.37570\/bgsd-1983-32-01","article-title":"Carcharodon megalodon from the Upper Miocene of Denmark, with comments on elasmobranch tooth enameloid: corono\u00efn","volume":"32","author":"Bendix\u2010Almgreen SE","year":"1983","journal-title":"Bull Geol Soc Denmark"},{"key":"e_1_2_7_3_1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.34194\/ggub.v182.5126","article-title":"Vertebrate remains from Upper Silurian\u2013Lower Devonian beds of Hall Land, North Greenland","volume":"182","author":"Blom H","year":"1999","journal-title":"Geol Greenland Survey Bull"},{"key":"e_1_2_7_4_1","first-page":"521","article-title":"Vertebrati retici Italiani","volume":"6","author":"Boni A","year":"1937","journal-title":"Atti della R Acc Naz dei Lincei\u2013Memorie della Cl di Sc fis mat e nat"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature07436"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0016-6995(95)80133-2"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2818.2006.01526.x"},{"key":"e_1_2_7_8_1","first-page":"211","article-title":"Mesozoic hybodont sharks from Asia and their relationships to the genus Ptychodus","volume":"58","author":"Cuny G","year":"2008","journal-title":"Acta Geol Polonica"},{"key":"e_1_2_7_9_1","first-page":"173","article-title":"Dents des poisons Turoniens pr\u00e9s du village de Dragoman, arr. de Sofia","volume":"34","author":"Datchev DM","year":"1973","journal-title":"Rev Bulgarian Geol Soc"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00015-004-1125-6"},{"key":"e_1_2_7_11_1","series-title":"Acanthodii","first-page":"62","volume-title":"Handbook of paleoichthyology","author":"Denison R","year":"1979"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1080\/02724630903409071"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.2330\/joralbiosci1965.21.667"},{"key":"e_1_2_7_14_1","first-page":"3","volume-title":"Biology of sharks and their relatives","author":"Grogan ED","year":"2004"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1463-6395.2008.00371.x"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1502-3931.1971.tb01285.x"},{"key":"e_1_2_7_17_1","first-page":"433","article-title":"\u00dcber den Bau und die Eintheilung der Pycnodonten, nebst kurzer Beschreibung einiger neuer Arten derselben","volume":"12","author":"Heckel J","year":"1854","journal-title":"Sitzungsberichte der kaiserlichen Akademie der Wissenschaften, mathematisch\u2010naturwissenschaftliche Klasse"},{"key":"e_1_2_7_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/0003-9969(70)90058-0"},{"key":"e_1_2_7_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/0003-9969(70)90146-9"},{"key":"e_1_2_7_20_1","doi-asserted-by":"publisher","DOI":"10.1080\/02724634.1999.10011167"},{"key":"e_1_2_7_21_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0040-8166(97)80044-4"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00427-008-0237-9"},{"key":"e_1_2_7_23_1","doi-asserted-by":"publisher","DOI":"10.1679\/aohc.47.89"},{"key":"e_1_2_7_24_1","doi-asserted-by":"publisher","DOI":"10.1679\/aohc.62.191"},{"key":"e_1_2_7_25_1","doi-asserted-by":"crossref","first-page":"408","DOI":"10.1093\/oso\/9780198540472.001.0001","volume-title":"Early vertebrates","author":"Janvier P","year":"1996"},{"key":"e_1_2_7_26_1","first-page":"43","volume-title":"Explanatory notes on the geological map of Bulgaria M1: 100 000. 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