Feeding biomechanics in Acanthostega and across the fish - tetrapod transition

James M. Neenan, Marcello Ruta, Jennifer A. Clack, Emily J. Rayfield*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

39 Citations (Scopus)

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.

Original languageEnglish
Article number20132689
Number of pages8
JournalProceedings of the Royal Society B: Biological Sciences
Volume281
Issue number1781
DOIs
Publication statusPublished - 22 Apr 2014

Keywords

  • Acanthostega
  • feeding
  • finite-element analysis
  • geometric morphometrics
  • phylogeny
  • fin-limb transition
  • FINITE-ELEMENT-ANALYSIS
  • EAST GREENLAND
  • SUTURE MORPHOLOGY
  • DEVONIAN TETRAPOD
  • BONE STRAIN
  • PERFORMANCE
  • EVOLUTION
  • ANATOMY
  • JAWS
  • ICHTHYOSTEGA

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