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In addition, oral papillae and taste buds are distributed among denticles within the oropharyngeal cavity, playing a fundamental role for tasting as part of the chemosensory system of fishes. Scanning electron microscopy (SEM) has been employed as an important tool for the study of dermal denticles and other structures, as well as histology and more recently computed tomography\u00a0(CT) scan analysis. Herein, the authors used two methods for the study of the morphology of the oropharyngeal cavity of <jats:italic>Lamna nasus<\/jats:italic> (Lamniformes), an oceanic and pelagic shark: SEM and CT scan. The general morphology of oral denticles studied herein is related to abrasion strength as they are diamond\u2010shaped, lack lateral cusps and have less pronounced ridges. In addition, smooth ridges and broad rounded denticles could be related to prevent abrasion during food consumption and manipulation. Oral papillae had a round shape and were observed only under SEM. The densities of papillae were estimated in 100 per cm<jats:sup>2<\/jats:sup>, whereas denticles were 1760 and 1230\u2009cm<jats:sup>2<\/jats:sup> over the dorsal and ventral regions, respectively. The high numbers of denticles are inversely proportional to papillae density; denticles seem to restrict papillae distribution. Regarding the differences between methodologies, under SEM, only the crown was visualized, as well the papillae, allowing the estimation of size and density of both structures. Nonetheless, under CT scan, the whole components of denticles were clearly visualized: different views of the crown, peduncle, basal plate, and pulp cavity. On the contrary, oral papillae were not visualized under CT due to the tissue preparation. Furthermore, both methods are complementary and were important to extract as much information as possible from denticles and papillae.<\/jats:p>","DOI":"10.1111\/jfb.15102","type":"journal-article","created":{"date-parts":[[2022,5,17]],"date-time":"2022-05-17T08:24:05Z","timestamp":1652775845000},"page":"226-235","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Morphological study of the oral denticles of the porbeagle shark <i>Lamna nasus<\/i>"],"prefix":"10.1111","volume":"101","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3773-3991","authenticated-orcid":false,"given":"Aline N.","family":"Poscai","sequence":"first","affiliation":[{"name":"Instituto de Bioci\u00eancias, Campus de Rio Claro, Universidade Estadual Paulista \u201cJ\u00falio de Mesquita Filho\u201d  Rio Claro Brazil"},{"name":"Laborat\u00f3rio de Pesquisa de Elasmobr\u00e2nquios Instituto de Bioci\u00eancias, Universidade Estadual Paulista \u201cJ\u00falio de Mesquita Filho\u201d  S\u00e3o Vicente Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2373-3421","authenticated-orcid":false,"given":"Jo\u00e3o Paulo C. B.","family":"da Silva","sequence":"additional","affiliation":[{"name":"Departamento de Sistem\u00e1tica e Ecologia, Centro de Ci\u00eancias Exatas e da Natureza Universidade Federal da Para\u00edba  Jo\u00e3o Pessoa Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6034-0208","authenticated-orcid":false,"given":"Andr\u00e9 Luis S.","family":"Casas","sequence":"additional","affiliation":[{"name":"Departamento de Ci\u00eancias do Mar Instituto do Mar, Universidade Federal de S\u00e3o Paulo  Santos Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6105-5716","authenticated-orcid":false,"given":"Phillip","family":"Lenktaitis","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Histologia, Departamento de Zoologia Instituto de Bioci\u00eancias, Universidade de S\u00e3o Paulo  S\u00e3o Paulo Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8109-5085","authenticated-orcid":false,"given":"Otto B. F.","family":"Gadig","sequence":"additional","affiliation":[{"name":"Instituto de Bioci\u00eancias, Campus de Rio Claro, Universidade Estadual Paulista \u201cJ\u00falio de Mesquita Filho\u201d  Rio Claro Brazil"},{"name":"Laborat\u00f3rio de Pesquisa de Elasmobr\u00e2nquios Instituto de Bioci\u00eancias, Universidade Estadual Paulista \u201cJ\u00falio de Mesquita Filho\u201d  S\u00e3o Vicente Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,6,3]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.20836"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1086\/BBLv222n1p26"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1242\/bio.022327"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-0-387-98182-6_6"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1159\/000339870"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1093\/icb\/17.2.303"},{"issue":"1","key":"e_1_2_9_8_1","first-page":"vii+249","article-title":"An annotated and illustrated catalogue of shark species known to date","volume":"4","author":"Compagno L. 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M.(2015).The evolution of speed: An empirical and comparative analysis of drag\u2010reducing scales in early fishes. University of Leedshttp:\/\/oatd.org\/oatd\/record?record=oai%5C%3Aetheses.whiterose.ac.uk%5C%3A13083."},{"key":"e_1_2_9_23_1","unstructured":"Fricke R. Eschmeyer W.N.&Fong J.D.(2021).CAS \u2010 Eschmeyer's Catalog of Fishes: Specieshttps:\/\/researcharchive.calacademy.org\/research\/ichthyology\/catalog\/fishcatmain.asp(accessed February 24 2022)."},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1111\/1749-4877.12095"},{"key":"e_1_2_9_25_1","volume-title":"Material characterisation of C\/SiC: Comparison of computed tomography and scanning electron microscopy","author":"Hausherr J.\u2010M.","year":"2006"},{"key":"e_1_2_9_26_1","first-page":"325","volume-title":"Biology of sharks and their relatives","author":"Hueter R. 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