A new echimyid genus (Rodentia, Caviomorpha) in Central Argentina: uncovered diversity of a Brazilian group of mammals in the Pleistocene
| Autor: | Adriana Magdalena Candela, Daniel A. Tassara, Carola Patricia Cañón Valenzuela, Marcos Cenizo, Luciano Luis Rasia, Nahuel Antu Muñoz, Ulises Francisco J. Pardiñas, Celine Robinet |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
010506 paleontology biology Pleistocene Mandible (insect mouthpart) Paleontology Clyomys laticeps Echimyidae biology.organism_classification 010603 evolutionary biology 01 natural sciences Euryzygomatomys spinosus Skull Geography medicine.anatomical_structure Genus medicine Caviomorpha 0105 earth and related environmental sciences |
| Zdroj: | Journal of Paleontology. 94:165-179 |
| ISSN: | 1937-2337 0022-3360 |
| DOI: | 10.1017/jpa.2019.73 |
| Popis: | We describe a new extinct spiny rat,Proclinodontomys dondasin. gen. n. sp. (Rodentia, Caviomorpha, Echimyidae), represented by a noteworthy preserved skull and mandible from the early-middle Pleistocene outcrops at the coastal cliffs of SE Buenos Aires Province (Central Argentina). Phylogenetic analyses allow us to propose that the new species described here and the already knownEurzygomatomys mordax(Winge) represent a new genus closely related to the livingEuryzygomatomys spinosusandClyomys laticeps. The new genus differs fromEuryzygomatomysandClyomysby having much more procumbent upper incisors, a more developed fossa for the M. temporalis, more flared and laterally expanded zygomatic arches, frontal less markedly expanded posteriorly, jugals much deeper anteriorly than posteriorly, with the dorsal border descending more abruptly posteriorly, smaller orbital cavity, and external auditory meatus relatively smaller and slanted upward and backward. Several features of the new species reflect a higher degree of adaptation to semifossorial habits than those ofE.spinosus. The origin of the semifossorial ecomorphotype within echimyids may have been triggered by the expansion of relatively open and arid environments that arose near the Miocene-Pliocene boundary. The record of this new echimyid in Central Argentina indicates that during the early-middle Pleistocene, the southern limit of the geographic range of extinct representatives of the Brazilian lineage of semifossorial echimyids extended farther south than that of their living members.UUID:http://zoobank.org/c30ec1fe-4352-4867-a02f-e0d45c884bfe |
| Databáze: | OpenAIRE |
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