Endocranial casts of early archosaurian reptiles |
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Authors: | David J. Gower Andrei G. Sennikov |
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Affiliation: | 1. Dept. of Geology, University of Bristol, Queens Rd., BS8 1RJ, Bristol, UK 2. Geologisches Institut, Universit?t Tübingen, Sigwartstrasse 10, 72076, Tübingen, Germany 3. Paleontological Institute, Profsoyuznaya 123, 117321, Moscow, Russia
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Abstract: | The first endocranial casts from non-crown-group archosaurian reptiles are described. Synthetic casts were made of the preserved parts of the endocranial cavities ofErythrosuchus africanus,Vjushkovia triplicostata andXilousuchus sapingensis. These casts are incomplete, but they reveal a substantial amount of information on the form of the early archosaur brain and inner ear. Cranial and pontine flexures are equal in bothErythrosuchus (45°) andV. triplicostata (35–40°). The endocasts ofXilousuchus andV. triplicostata are characterised by the possession of a pseudolagena and a quantifiable down-slope from the myelencephalon to the metencephalon — features that have yet to be described for other reptilian endocranial casts. |
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