Feeding biomechanics suggests progressive correlation of skull architecture and neck evolution in turtles

Research output: Contribution to journalArticle

Authors

  • Gabriel Ferreira
  • Serjoscha Evers
  • Cathrin Pfaff
  • Juergen Kriwet
  • Irena Raselli
  • Ingmar Werneburg

Colleges, School and Institutes

Abstract

The origin of turtles is one of the most long-lasting debates in evolutionary research. During their evolution, a series of modifications changed their relatively kinetic and anapsid skull into an elongated akinetic structure with a unique pulley system redirecting jaw adductor musculature. These modifications were thought to be strongly correlated to functional adaptations, especially to bite performance. We conducted a series of Finite Element Analyses (FEAs) of several species, including that of the oldest fully shelled, Triassic stem-turtle Proganochelys, to evaluate the role of force distribution and to test existing hypotheses on the evolution of turtle skull architecture. We found no support for a relation between the akinetic nature of the skull or the trochlear mechanisms with increased bite forces. Yet, the FEAs show that those modifications changed the skull architecture into an optimized structure, more resistant to higher loads while allowing material reduction on specific regions. We propose that the skull of modern turtles is the result of a complex process of progressive correlation between their heads and highly flexible necks, initiated by the origin of the shell.

Details

Original languageEnglish
Article number5505
Number of pages11
JournalScientific Reports
Volume10
Issue number1
Publication statusPublished - 26 Mar 2020