Journal of Mammalian Evolution

, Volume 20, Issue 3, pp 191–198 | Cite as

The Bony Labyrinth in Diprotodontian Marsupial Mammals: Diversity in Extant and Extinct Forms and Relationships with Size and Phylogeny

  • Léanie Alloing-Séguier
  • Marcelo R. Sánchez-Villagra
  • Michael S. Y. Lee
  • Renaud Lebrun
Original Paper

Abstract

The shape of the bony labyrinth of the inner ear was quantified using geometric morphometrics in a sample of 16 species of living marsupial diprotodontians, the extinct Diprotodon and Thylacoleo, and four outgroups. X-ray micro-computed tomography (μCT) and conventional computed tomography (CT) were used to acquire 3D data. The analyses of 22 landmarks revealed a strong body-mass related allometric pattern. A discriminant analysis on allometry-free labyrinthine shape served to evaluate the phylogenetic signal portion of the labyrinth for Macropodiformes, Phalangeroidea, Petauroidea, and Vombatiformes. The inner shape of Thylacoleo is consistent with its phylogenetic placement as a vombatiform.

Keywords

Inner ear Diprotodontia Diprotodon Thylacoleo Geometric morphometrics Allometry 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Léanie Alloing-Séguier
    • 1
  • Marcelo R. Sánchez-Villagra
    • 2
  • Michael S. Y. Lee
    • 3
  • Renaud Lebrun
    • 1
  1. 1.Université Montpellier 2Institut des Sciences de l’Evolution (UMR-CNRS 5554)Montpellier Cedex 05France
  2. 2.Palaeontologisches Institut und MuseumZürichSwitzerland
  3. 3.Earth Sciences Section, South Australian MuseumAdelaideAustralia

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