Neurosensory anatomy and function in Seymouria.

Autor: Bazzana-Adams KD; Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada.; Department of Natural History, Royal Ontario Museum, Toronto, Canada., Evans DC; Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada.; Department of Natural History, Royal Ontario Museum, Toronto, Canada., Bevitt JJ; Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales, Australia., Reisz RR; Department of Biology, University of Toronto Mississauga, Mississauga, Canada.; International Center of Future Science, Dinosaur Evolution Research Center, Jilin University, Changchun, Jilin Province, China.
Jazyk: angličtina
Zdroj: Journal of morphology [J Morphol] 2023 May; Vol. 284 (5), pp. e21577.
DOI: 10.1002/jmor.21577
Abstrakt: Seymouria is among the best-known stem amniotes and holds an important phylogenetic position for discussions of amniote evolution. Previous work has focused primarily on the osteology of Seymouria, with recent interest turning to the application of computed tomography (CT) to study the internal features. We utilized neutron CT to reconstruct the first virtual cranial endocast and the first complete otic endocasts of Seymouria, revealing previously unrecognized details of its palaeoneuroanatomy. The brain and inner ear of Seymouria are largely plesiomorphic relative to later-diverging crown amniotes, showing no indication of increased encephalization or braincase ossification. Our results also clarify the plesiomorphic condition for carotid artery morphology in amniotes, with Seymouria showing a similar condition to basal members of both the synapsid and sauropsid lineages. The reconstructed neuroanatomy also indicates that Seymouria did not possess any particular neuroanatomical specializations, despite the probable presence of an impedance matching hearing system.
(© 2023 The Authors. Journal of Morphology published by Wiley Periodicals LLC.)
Databáze: MEDLINE
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