Skip to content

Convergence and functional evolution of longirostry in crocodylomorphs

Research output: Contribution to journalArticle

Original languageEnglish
Number of pages21
JournalPalaeontology
Early online date29 Mar 2019
DOIs
DateAccepted/In press - 19 Feb 2019
DateE-pub ahead of print (current) - 29 Mar 2019

Abstract

During the Mesozoic, Crocodylomorpha had a much higher taxonomic and morphological diversity than today. Members of one particularly successful clade, Thalattosuchia, are well‐known for being longirostrine: having long, slender snouts. It has generally been assumed that Thalattosuchia owed their success in part to the evolution of longirostry, leading to a feeding ecology similar to that of the living Indian gharial, Gavialis. Here, we compare form and function of the skulls of the thalattosuchian Pelagosaurus and Gavialis using digital reconstructions of the skull musculoskeletal anatomy and finite element models to show that they had different jaw muscle arrangements and biomechanical behaviour. Additionally, the relevance of feeding‐related mandibular traits linked to longirostry in the radiation of crocodylomorph clades was investigated by conducting an evolutionary rates analysis under the variable rates model. We find that, even though Pelagosaurus and Gavialis share similar patterns of stress distribution in their skulls, the former had lower mechanical resistance. This suggests that compared to Gavialis, Pelagosaurus was unable to process large, mechanically less tractable prey, instead operating as a specialized piscivore that fed on softer and smaller prey. Secondly, innovation of feeding strategies was achieved by rate acceleration of functional characters of the mandible, a key mechanism for the diversification of certain clades like thalattosuchians and eusuchians. Different rates of functional evolution suggest divergent diversification dynamics between teleosaurids and metriorhynchids in the Jurassic.

    Research areas

  • feeding convergence finite element analysis evolutionary rates Crocodylomorpha Thalattosuchia

Documents

Documents

  • Full-text PDF (final published version)

    Rights statement: This is the final published version of the article (version of record). It first appeared online via Wiley at https://onlinelibrary.wiley.com/doi/full/10.1111/pala.12432 . Please refer to any applicable terms of use of the publisher.

    Final published version, 8 MB, PDF-document

    Request copy

    Licence: CC BY

DOI

View research connections

Related faculties, schools or groups