The Cranial Endoskeleton of Tiktaalik Roseae

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The Cranial Endoskeleton of Tiktaalik Roseae

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Title: The Cranial Endoskeleton of Tiktaalik Roseae
Author: Jenkins, Farish; Downs, Jason P.; Daeschler, Edward B.; Shubin, Neil H.

Note: Order does not necessarily reflect citation order of authors.

Citation: Downs, Jason P., Edward B. Daeschler, Farish A. Jenkins Jr., and Neil H. Shubin. 2008. The cranial endoskeleton of Tiktaalik roseae. Nature 455(7215): 925-929.
Access Status: At the direction of the depositing author this work is not currently accessible through DASH.
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Abstract: Among the morphological changes that occurred during the ‘fish-to-tetrapod’ transition was a marked reorganization of the cranial endoskeleton. Details of this transition, including the sequence of character acquisition, have not been evident from the fossil record. Here we describe the braincase, palatoquadrate and branchial skeleton of Tiktaalik roseae, the Late Devonian sarcopterygian fish most closely related to tetrapods. Although retaining a primitive configuration in many respects, the cranial endoskeleton of T. roseae shares derived features with tetrapods such as a large basal articulation and a flat, horizontally oriented entopterygoid. Other features in T. roseae, like the short, straight hyomandibula, show morphology intermediate between the condition observed in more primitive fish and that observed in tetrapods. The combination of characters in T. roseae helps to resolve the relative timing of modifications in the cranial endoskeleton. The sequence of modifications suggests changes in head mobility and intracranial kinesis that have ramifications for the origin of vertebrate terrestriality.
Published Version: http://dx.doi.org/10.1038/nature07189
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:2680266

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  • FAS Scholarly Articles [6466]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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