Rastosuchus hammeri gen. et sp. nov. Â
Eliseu Vieira Dias, SÃrgio Dias-da-Silva & Cesar Leandro Schultz (2020)
A new short-snouted rhinesuchid from the Permian of southern Brazil.
Revista Brasileira De Paleontologia 23(2): 98-122
doi:
https://doi.org/10.4072/rbp.2020.2.03https://sbpbrasil.org/rbp/index.php/rbp/article/view/113Free pdf:
https://sbpbrasil.org/rbp/index.php/rbp/article/view/113/44A new basal stereospondyl taxon from the Permian is described. The material used to erect the new taxon consists of a series of mandibles and some postcranial elements. A single badly preserved short-snouted skull is considered as referred material. Rastosuchus hammeri gen. et sp. nov. presents conical teeth along all coronoid bones, the prearticular extending anteriorly at the level of the precoronoid and enlarged anterior meckelian foramina. Based on the referred material, R. hammeri gen. et sp. nov. also presents posterior premaxillary teeth larger than anterior ones, the cultriform process of the parasphenoid compressed laterally forming a medial ventral keel, posterolateral ramus of the vomer extends posterior to the palatine tusks, and rounded orbit with flat orbital bones at the same level of the skull roof, features shared with Australerpeton cosgriffi and other rhinesuchids. Australerpeton cosgriffi and Rastosuchus hammeri gen. et sp. nov. are from the upper layers of the Rio do Rasto Formation (Paranà Basin) in the Paranà State, southern Brazil, and its deposition in freshwater continental environments is reinforced by the presence of temnospodyls amphibians.