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A Silurian maxillate placoderm illuminates jaw evolution
Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, POB 643, Beijing 100044, Peoples R China.;Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, POB 643, Beijing 100044, Peoples R China.;Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
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2016 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 354, no 6310, 334-336 p.Article in journal (Refereed) Published
Abstract [en]

The discovery of Entelognathus revealed the presence of maxilla, premaxilla, and dentary, supposedly diagnostic osteichthyan bones, in a Silurian placoderm. However, the relationship between these marginal jaw bones and the gnathal plates of conventional placoderms, thought to represent the inner dental arcade, remains uncertain. Here we report a second Silurian maxillate placoderm, which bridges the gnathal and maxillate conditions. We propose that the maxilla, premaxilla, and dentary are homologous to the gnathal plates of placoderms and that all belong to the same dental arcade. The gnathal-maxillate transformation occurred concurrently in upper and lower jaws, predating the addition of infradentary bones to the lower jaw.

Place, publisher, year, edition, pages
2016. Vol. 354, no 6310, 334-336 p.
National Category
Evolutionary Biology Other Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-310775DOI: 10.1126/science.aah3764ISI: 000387777100046PubMedID: 27846567OAI: oai:DiVA.org:uu-310775DiVA: diva2:1057899
Funder
Swedish Research Council, 2014-4102Knut and Alice Wallenberg Foundation
Available from: 2016-12-19 Created: 2016-12-19 Last updated: 2016-12-19Bibliographically approved

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