An additional brain endocast of the ictidosaur Riograndia guaibensis (Eucynodontia: Probainognathia): intraspecific variation of endocranial traits

An additional brain endocast of the ictidosaur Riograndia guaibensis (Eucynodontia: Probainognathia): intraspecific variation of endocranial traits

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...

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Bibliographic Details
Published in:Anais da Academia Brasileira de Ciências Vol. 93; no. suppl 2; p. e20200084
Main Authors: Kerber, Leonardo, Ferreira, JosÉ Darival, Fonseca, Pedro Henrique M, Franco, Arymatheia, Martinelli, AgustÍn G, Soares, Marina Bento, Ribeiro, Ana Maria
Format: Journal Article
Language:English
Published: Brazil Academia Brasileira de Ciências 01-01-2021
Subjects:
Biological Evolution
Brain
Endocranium
Fossils
Ictidosauria
Micro-CT
MULTIDISCIPLINARY SCIENCES
paleoneurology
Phenotype
Phylogeny
Skull - anatomy & histology
Micro-CT
Ictidosauria
paleoneurology
Endocranium
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Summary: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.
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ISSN:0001-3765
1678-2690
1678-2690
DOI:10.1590/0001-3765202120200084