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Testing models of dental development in the earliest bony vertebrates, Andreolepis and Lophosteus

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Testing models of dental development in the earliest bony vertebrates, Andreolepis and Lophosteus

dc.contributor.author	Cunningham, John A.	es_ES
dc.contributor.author	Rücklin, Martin	es_ES
dc.contributor.author	Blom, Henning	es_ES
dc.contributor.author	Botella, Hector	es_ES
dc.contributor.author	Donoghue, Philip C. J.	es_ES
dc.date.accessioned	2015-06-19T10:19:55Z
dc.date.available	2015-06-19T10:19:55Z
dc.date.issued	2012	es_ES
dc.identifier.citation	Biology Letters Vol. 8 Issue 5: pp. 833-837	es_ES
dc.identifier.uri	http://hdl.handle.net/10550/44563
dc.description.abstract	Theories on the development and evolution of teeth have long been biased by the fallacy that chondrichthyans reflect the ancestral condition for jawed vertebrates. However, correctly resolving the nature of the primitive vertebrate dentition is challenged by a dearth of evidence on dental development in primitive osteichthyans. Jaw elements from the Silurian–Devonian stem-osteichthyans Lophosteus and Andreolepis have been described to bear a dentition arranged in longitudinal rows and vertical files, reminiscent of a pattern of successional development. We tested this inference, using synchrotron radiation X-ray tomographic microscopy (SRXTM) to reveal the pattern of skeletal development preserved in the sclerochronology of the mineralized tissues. The tooth-like tubercles represent focal elaborations of dentine within otherwise continuous sheets of the dermal skeleton, present in at least three stacked generations. Thus, the tubercles are not discrete modular teeth and their arrangement into rows and files is a feature of the dermal ornamentation that does not reflect a polarity of development or linear succession. These fossil remains have no bearing on the nature of the dentition in osteichthyans and, indeed, our results raise questions concerning the homologies of these bones and the phylogenetic classification of Andreolepis and Lophosteus.	es_ES
dc.subject	Osteichthyes	es_ES
dc.subject	Andreolepis	es_ES
dc.subject	Lophosteus	es_ES
dc.subject	tooth	es_ES
dc.subject	development	es_ES
dc.subject	evolution	es_ES
dc.title	Testing models of dental development in the earliest bony vertebrates, Andreolepis and Lophosteus	es_ES
dc.type	journal article	es_ES
dc.identifier.doi	10.1098/rsbl.2012.0357	es_ES
dc.identifier.idgrec	085881	es_ES