3D computational imaging of the petrosal of a new multituberculate mammal from the Late Cretaceous of China and its paleobiologic inferences. - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Comptes Rendus. Palevol Année : 2010

3D computational imaging of the petrosal of a new multituberculate mammal from the Late Cretaceous of China and its paleobiologic inferences.

Résumé

The derived middle and inner ears of mammals are the major features distinguishing them from non-mammalian vertebrates. Among them, multituberculate mammals represent an important transitional stage and a groundplan for further therian ear evolution. We present the reconstruction of petrosal features of a new multituberculate from the Late Cretaceous of Inner Mongolia (China) based on high resolution computed tomography and three-dimensional imaging analysis. Besides questioning some aspects of previous interpretations, this study reveals a combination of derived and primitive characters, such as a therian-like vascular and nervous pattern and internal acoustic meatus, and a monotreme-like inner ear, but with a derived semicircular canal planarity. The possible presence of a primary bony lamina for the basilar membrane could demonstrate that the first step in the elaboration of a coiled cochlea was already present in multituberculates. Auditory capabilities can be deduced for this animal, which was certainly terrestrial and possibly fossorial.

Domaines

Paléontologie

Dates et versions

hal-00628585 , version 1 (03-10-2011)

Identifiants

Citer

S. Ladevèze, C. de Muizon, M. Colbert, T. Smith. 3D computational imaging of the petrosal of a new multituberculate mammal from the Late Cretaceous of China and its paleobiologic inferences.. Comptes Rendus. Palevol, 2010, 9 (6-7), pp.319-330. ⟨10.1016/j.crpv.2010.07.008⟩. ⟨hal-00628585⟩
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