A new specimen provides insights into the anatomy of Irajatherium hernandezi , a poorly known probainognathian cynodont from the Late Triassic of southern Brazil
| العنوان: | A new specimen provides insights into the anatomy of |
|---|---|
| المؤلفون: | Flávio A. Pretto, Leonardo Kerber, Agustín G. Martinelli, Rodrigo Temp Müller |
| المصدر: | The Anatomical Record. 305:3113-3132 |
| بيانات النشر: | Wiley, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Mammals, Histology, biology, Fossils, Skull, Rostrum, Brasilodon, Anatomy, biology.organism_classification, Cynodont, medicine.anatomical_structure, Eucynodontia, medicine, Animals, Tritylodontidae, Mammaliaformes, Temporal fossa, Brazil, Phylogeny, Ecology, Evolution, Behavior and Systematics, Biotechnology |
| الوصف: | Irajatherium hernandezi is a poorly known non-mammaliaform cynodont from the Late Triassic of southern Brazil. A new specimen of this cynodont was found in recent fieldwork to the type-locality, Sesmaria do Pinhal (Candelária), providing new insights into the anatomy of this mammalian forerunner. This specimen comprises a partial skull preserving the left canine, two left and three right postcanines, and an isolated exoccipital; the left dentary with the canine and postcanines; a fragment of the right dentary; the proximal portion of the left partial humerus; the right scapula; and indeterminate fragments. Based on new material, it is here suggested that I. hernandezi presents: a rostrum broad and short, possibly long as the temporal region; three foramina on the lateral surface of the maxilla, that could correspond to the external openings of the rostral alveolar, infraorbital, and zygomaticofacial canals; a slender zygomatic arch and an absent postorbital bar; a posteriorly wide temporal fossa; a long secondary palate, slightly surpassing the level of the last postcanine tooth; the cerebral hemispheres of the cranial endocast divided by a median sulcus; the scapular blade long and straight, and the postscapular fossa absent in lateral aspect. Finally, I. hernandezi and other tritheledontids were included in a phylogenetic analysis of Eucynodontia. The analysis recovered unresolved relationships for ictidosaurs/tritheledontids, nested within a polytomy with Tritylodontidae and a clade composed by Pseudotherium argentinus, Botucaraitherium belarminoi, Brasilodon quadrangularis, and Mammaliaformes. |
| تدمد: | 1932-8494 1932-8486 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3be7526756a341e310e0a2d7ec37977 https://doi.org/10.1002/ar.24830 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi.dedup.....a3be7526756a341e310e0a2d7ec37977 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19328494 19328486 |
|---|