首页|Ontogenetic variability of the intertympanic sinus distinguishes lineages within Crocodylia

Ontogenetic variability of the intertympanic sinus distinguishes lineages within Crocodylia

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  • NSTL
  • Wiley
Abstract The phylogenetic relationships within crown Crocodylia remain contentious due to conflicts between molecular and morphological hypotheses. However, morphology‐based datasets are mostly constructed on external characters, overlooking internal structures. Here, we use 3D geometric morphometrics to study the shape of the intertympanic sinus system in crown crocodylians during ontogeny, in order to assess its significance in a taxonomic context. Intertympanic sinus shape was found to be highly correlated with size and modulated by cranial shape during development. Still, adult sinus morphology distinguishes specimens at the family, genus and species level. We observe a clear distinction between Alligatoridae and Longirostres, a separation of different Crocodylus species and the subfossil Malagasy genus Voay, and a distinction between the Tomistoma and Gavialis lineages. Our approach is independent of molecular methods but concurs with the molecular topologies. Therefore, sinus characters could add significantly to morphological datasets, offering an alternative viewpoint to resolve problems in crocodylian relationships.

3D geometric morphometricsCrocodyliaontogenysinus

Gwendal Perrichon、Lionel Hautier、Yohan Pochat‐Cottilloux、Irena Raselli、Céline Salaviale、Benjamin Dailh、Nicolas Rinder、Vincent Fernandez、Jér?me Adrien、Jo?l Lachambre、Jeremy E. Martin

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CNRS UMR 5276, Université Claude Bernard Lyon 1, ENS de Lyon, Laboratoire de Géologie de Lyon

Institut des Sciences de l'évolution,Université Montpellier, CNRS, IRD, EPHE

Geoscience Department, Chemin de Musée 6,University of Fribourg

Imaging and Analysis Centre,The Natural History Museum

Laboratoire Matériaux, Ingénierie et Science,Institut National des Sciences Appliquées de Lyon

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2023

10.1111/joa.13830

Journal of Anatomy

Journal of Anatomy

SCI
ISSN：0021-8782
年,卷(期)：2023.242(6)
  • 2
  • 87