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Romundina and the evolutionary origin of teeth.
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Romundina and the evolutionary origin of teeth.

Author: M Rücklin Affiliation: Naturalis Biodiversity Center, Postbus 9517, 2300 RA Leiden, The Netherlands School of Earth Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK martin.rucklin@naturalis.nl.; PC Donoghue Affiliation: School of Earth Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK phil.donoghue@bristol.ac.uk.
Edition/Format: Article Article : English
Publication:Biology letters, 2015 Jun; 11(6): 20150326
Summary:
Theories on the origin of vertebrate teeth have long focused on chondrichthyans as reflecting a primitive condition-but this is better informed by the extinct placoderms, which constitute a sister clade or grade to the living gnathostomes. Here, we show that 'supragnathal' toothplates from the acanthothoracid placoderm Romundina stellina comprise multi-cuspid teeth, each composed of an enameloid cap and core of  Read more...
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Document Type: Article
All Authors / Contributors: M Rücklin Affiliation: Naturalis Biodiversity Center, Postbus 9517, 2300 RA Leiden, The Netherlands School of Earth Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK martin.rucklin@naturalis.nl.; PC Donoghue Affiliation: School of Earth Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK phil.donoghue@bristol.ac.uk.
ISSN:1744-9561
Language Note: English
Unique Identifier: 5846752896
Awards:

Abstract:

Theories on the origin of vertebrate teeth have long focused on chondrichthyans as reflecting a primitive condition-but this is better informed by the extinct placoderms, which constitute a sister clade or grade to the living gnathostomes. Here, we show that 'supragnathal' toothplates from the acanthothoracid placoderm Romundina stellina comprise multi-cuspid teeth, each composed of an enameloid cap and core of dentine. These were added sequentially, approximately circumferentially, about a pioneer tooth. Teeth are bound to a bony plate that grew with the addition of marginal teeth. Homologous toothplates in arthrodire placoderms exhibit a more ordered arrangement of teeth that lack enameloid, but their organization into a gnathal, bound by layers of cellular bone associated with the addition of each successional tooth, is the same. The presence of enameloid in the teeth of Romundina suggests that it has been lost in other placoderms. Its covariation in the teeth and dermal skeleton of placoderms suggests a lack of independence early in the evolution of jawed vertebrates. It also appears that the dentition-manifest as discrete gnathal ossifications-was developmentally discrete from the jaws during this formative episode of vertebrate evolution.

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