Feeding biomechanics in Acanthostega and across the fish–tetrapod transition

Neenan, James M. and Ruta, Marcello and Clack, Jennifer A. and Rayfield, Emily J. (2014) Feeding biomechanics in Acanthostega and across the fish–tetrapod transition. Proceedings of the Royal Society B, 281 (1781). pp. 1-8. ISSN 0962-8436

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Abstract

Acanthostega is one of the earliest and most primitive limbed vertebrates. Its numerous fish-like features indicate a primarily aquatic lifestyle, yet cranial suture morphology suggests that its skull is more similar to those of terrestrial taxa. Here, we apply geometric morphometrics and two-dimensional finite-element analysis to the lower jaws of Acanthostega and 22 other tetrapodomorph taxa in order to quantify morphological and functional changes across the fish–tetrapod transition. The jaw of Acanthostega is similar to that of certain tetrapodomorph fish and transitional Devonian taxa both morphologically (as indicated by its proximity to those taxa in morphospace) and functionally (as indicated by the distribution of stress values and relative magnitude of bite force). Our results suggest a slow tempo of morphological and biomechanical changes in the transition from Devonian tetrapod jaws to aquatic/semi-aquatic Carboniferous tetrapod jaws. We conclude that Acanthostega retained a primitively aquatic lifestyle and did not possess cranial adaptations for terrestrial feeding.

Keywords:acanthostega, feeding, finite-element analysis, geometric morphometrics, phylogeny, fin-limb transition, NotOAChecked
Subjects:C Biological Sciences > C300 Zoology
C Biological Sciences > C182 Evolution
C Biological Sciences > C191 Biometry
F Physical Sciences > F641 Palaeontology
Divisions:College of Science > School of Life Sciences
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ID Code:13430
Deposited On:26 Feb 2014 10:59

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