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

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

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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.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.source Biology Letters Vol. 8 Issue 5: pp. 833-837 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 info:eu-repo/semantics/article es_ES
dc.identifier.doi 10.1098/rsbl.2012.0357 es_ES
dc.identifier.idgrec 085881 es_ES

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