Exceptional endocranium and middle ear of Stanocephalosaurus (Temnospondyli: Capitosauria) from the Triassic of Algeria revealed by micro-CT scan, with new functional interpretations of the hearing system
| Autor: | Anissa Dahoumane, J. Sébastien Steyer, Thomas Arbez |
|---|---|
| Přispěvatelé: | Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P), Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université des Sciences et de la Technologie Houari Boumediene [Alger] (USTHB), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger] (USTHB) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
010506 paleontology biology Skull roof Temnospondyli Vertebrate Anatomy biology.organism_classification 010603 evolutionary biology 01 natural sciences Capitosauria Skull medicine.anatomical_structure biology.animal Endocranium medicine Middle ear Animal Science and Zoology [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Stapes |
| Zdroj: | Zoological Journal of the Linnean Society Zoological Journal of the Linnean Society, Linnean Society of London, 2017, 180 (4), pp.910-929. ⟨10.1093/zoolinnean/zlw007⟩ Zoological Journal of the Linnean Society, 2017, 180 (4), pp.910-929. ⟨10.1093/zoolinnean/zlw007⟩ |
| ISSN: | 0024-4082 1096-3642 |
| Popis: | International audience; Temnospondyls form a large clade of extinct non-amniotic tetrapods. Although their external cranial anatomy is relatively well known, their endocranium (i.e. internal structures of the skull) remains poorly known due to the lack of well-preserved material with conservation of the original anatomic volume. Internal structures are generally crushed under the skull roof due to the frequent flattening of skulls during fossilization. Yet this region is of great paleobiological interest with respect to the hearing, nervous, and vascular systems. In addition, endocranial characters have already been shown to be phylogenetically very informative in various vertebrate groups (e.g. mammals, dinosaurs). An exquisite skull belonging to Stanocephalosaurus amenasensis from the Lower-Middle Triassic of the Zarzaïtine Series (Algeria) has been investigated by X-ray micro-CT (computed tomography) scan. The resulting 3-D reconstruction of this unique specimen reveals highly detailed anatomy of the endocranial region, which is described herein. In addition, both columellar cavity and stapes morphologies lead to a new functional hypothesis for the stapes as part of an underwater hearing system. This endocranium description increases our knowledge of temnospondyl paleobiology and endocranial structure variability. The hearing system postulated in S. amenasensis provides an evolutionary scenario which is also compared with that of extant anurans. |
| Databáze: | OpenAIRE |
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