An additional brain endocast of the ictidosaur Riograndia guaibensis (Eucynodontia: Probainognathia): intraspecific variation of endocranial traits
| Autor: | José Darival Ferreira, Pedro Henrique Morais Fonseca, Ana Maria Ribeiro, Agustín G. Martinelli, Arymathéia Santos Franco, Leonardo Kerber, Marina Bento Soares |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Micro-CT Ontogeny Science Endocranium 010603 evolutionary biology 01 natural sciences purl.org/becyt/ford/1 [https] 03 medical and health sciences purl.org/becyt/ford/1.5 [https] Phylogeny Ictidosauria 030304 developmental biology 0303 health sciences Multidisciplinary biology Fossils Skull paleoneurology Probainognathia Encephalization Brain Anatomy biology.organism_classification Biological Evolution Cynodont Phenotype Eucynodontia Paleoneurology Endocast |
| Zdroj: | Anais da Academia Brasileira de Ciências, Volume: 93 Supplement 2, Article number: e20200084, Published: 05 MAR 2021 CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET Anais da Academia Brasileira de Ciências v.93 suppl.2 2021 Anais da Academia Brasileira de Ciências Academia Brasileira de Ciências (ABC) instacron:ABC Anais da Academia Brasileira de Ciências, Vol 93, Iss suppl 2 (2021) |
| Popis: | Recently, the morphology and encephalization of the brain endocast of the Triassic non-mammaliaform probainognathian cynodont Riograndia guaibensis were studied. Here, we analyzed the brain endocast of an additional specimen of this species. The new endocast shows well-defined olfactory bulbs and a median sulcus dividing the hemispheres, traits that were not clearly observed in the first studied specimen. Encephalization quotients were also calculated, revealing similar values to other non-mammaliaform cynodonts and lower than those of the first analyzed specimen. The analyzed cranium is slightly larger than the first studied one and may represent an advanced ontogenetic stage. Hence, these differences may be related to the intraspecific variation of this cynodont or alternatively, to the preservation of each specimen. Fil: Kerber, Leonardo. Universidade Federal de Santa Maria; Brasil Fil: Ferreira, José Darival. Universidade Federal de Santa Maria; Brasil Fil: Fonseca, Pedro Henrique M.. Universidade Federal do Rio Grande do Sul; Brasil Fil: Franco, Arymatheia. Universidade Federal de Santa Maria; Brasil Fil: Martinelli, Agustín Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Soares, Marina Bento. Universidade Federal do Rio Grande do Sul; Brasil. Universidade Federal do Rio de Janeiro; Brasil Fil: Ribeiro, Ana Maria. Universidade Federal do Rio Grande do Sul; Brasil |
| Databáze: | OpenAIRE |
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