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One of the most typical examples of this characteristic is given by the Crurotarsi, a taxon formed by the crocodilians and their closest allies, which generally display deep ornamentation on skull roof and osteoderms. However, the ontogenetic process responsible for the differentiation and development of this character remains controversial. This study was conducted to settle the question on histological and microanatomical evidence in several crurotarsan taxa. Observational and experimental data in extant and extinct crocodyliforms show that bone ornamentation is initially created, and later maintained during somatic growth (that is indefinite in crocodilians), by a complex process of bone remodeling comprising local resorption of superficial bone cortices, followed by partial reconstruction. The superficial reliefs of crocodilian dermal bones are thus permanently modified through pit enlargement, drift, stretching, shrinking, or complete filling. Ridges are also remodeled in corresponding ways. These processes allow accommodation of unitary ornamental motifs to the overall dimensions of the bones during growth. A parsimony optimization based on the results of this study, but integrating also published data on bone histology in non\u2010crocodyliform crurotarsans and some non\u2010crurotarsan taxa, suggests that the peculiar mechanism described above for creating and maintaining bone ornamentation is a general feature of the Crurotarsi and is quite distinct from that attributed by previous authors to other vertebrates. J. Morphol. 276:425\u2013445, 2015. \u00a9 2014 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/jmor.20351","type":"journal-article","created":{"date-parts":[[2014,12,9]],"date-time":"2014-12-09T14:30:46Z","timestamp":1418135446000},"page":"425-445","source":"Crossref","is-referenced-by-count":67,"title":["Differentiation and growth of bone ornamentation in vertebrates: A comparative histological study among the Crocodylomorpha"],"prefix":"10.1002","volume":"276","author":[{"given":"V.","family":"de Buffr\u00e9nil","sequence":"first","affiliation":[{"name":"D\u00e9partement Histoire de la Terre, Mus\u00e9um National d'Histoire Naturelle, UMR 7207 (CR2P), Sorbonne Universit\u00e9s, MNHN\/CNRS\/UPMC B\u00e2timent de G\u00e9ologie Paris Cedex 05 F\u201075231 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F.","family":"Clarac","sequence":"additional","affiliation":[{"name":"D\u00e9partement Histoire de la Terre, Mus\u00e9um National d'Histoire Naturelle, UMR 7207 (CR2P), Sorbonne Universit\u00e9s, MNHN\/CNRS\/UPMC B\u00e2timent de G\u00e9ologie Paris Cedex 05 F\u201075231 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Fau","sequence":"additional","affiliation":[{"name":"D\u00e9partement Histoire de la Terre, Mus\u00e9um National d'Histoire Naturelle, UMR 7207 (CR2P), Sorbonne Universit\u00e9s, MNHN\/CNRS\/UPMC B\u00e2timent de G\u00e9ologie Paris Cedex 05 F\u201075231 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Martin","sequence":"additional","affiliation":[{"name":"Ferme \u00e0 Crocodiles de Pierrelatte Pierrelatte F\u201026700 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B.","family":"Martin","sequence":"additional","affiliation":[{"name":"Ferme \u00e0 Crocodiles de Pierrelatte Pierrelatte F\u201026700 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E.","family":"Pell\u00e9","sequence":"additional","affiliation":[{"name":"Direction des Collections Mus\u00e9um National d'Histoire Naturelle Paris Cedex 05 F\u201075231 France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Laurin","sequence":"additional","affiliation":[{"name":"D\u00e9partement Histoire de la Terre, Mus\u00e9um National d'Histoire Naturelle, UMR 7207 (CR2P), Sorbonne Universit\u00e9s, MNHN\/CNRS\/UPMC B\u00e2timent de G\u00e9ologie Paris Cedex 05 F\u201075231 France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2014,12,8]]},"reference":[{"key":"e_1_2_6_2_1","first-page":"273","volume-title":"Biology of the Reptilia","author":"Andrews RM","year":"1982"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1643\/0045-8511(2000)000[0657:PRADTO]2.0.CO;2"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1080\/02724634.2012.633585"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1080\/08912963.2012.662680"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1080\/14772010903537732"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1463-6395.2011.00502.x"},{"key":"e_1_2_6_8_1","first-page":"541","article-title":"Fossil crocodilians from Tiupampa, (Santa Lucia Formation, Early Paleocene) Bolivia: a preliminary report. 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