CICYTTP   12500
CENTRO DE INVESTIGACION CIENTIFICA Y DE TRANSFERENCIA TECNOLOGICA A LA PRODUCCION
Unidad Ejecutora - UE
artículos
Título:
New records of Neogene Xenarthra (Mammalia) from eastern Puna (Argentina): diversity and biochronology
Autor/es:
QUIÑONES, SOFÍA I.; CONTRERAS, SILVINA A.; CAMACHO, MARÍA; BRANDONI, DIEGO; ZURITA, ALFREDO E.; CANDELA, ADRIANA M.; SOLÍS, NATALIA; MIÑO-BOILINI, ÁNGEL R.; LUNA, CARLOS A.; ERCOLI, MARCOS D.
Revista:
JOURNAL OF PALEONTOLOGY
Editorial:
PALEONTOLOGICAL SOC INC
Referencias:
Lugar: Lawrence; Año: 2019 vol. 93 p. 1258 - 1275
ISSN:
0022-3360
Resumen:
Xenarthra is an endemic South American lineage of mammals, probably the sister clade of the remaining placental mammals. The oldest records come from the latest Paleocene, although its current relictual diversity is much lower compared with that reached in some intervals of the Cenozoic Era. Recently, the knowledge of the evolutionary history of this clade has been largely increased, even though much work is still need. A new Neogene Xenarthra (Pilosa and Cingulata) assemblage from two localities of the Argentine Eastern Puna (Calahoyo and Casira) is described. The new recorded taxa (Cingulata Dasypodidae, Eutatini, gen. et sp. nov., Stenotatus sp. nov., Machrochorobates scalabrinii and the Tardigrada Mylodontinae, Mylodontinae cf. Simomylodon and Simomylodon cf. uccasamamensis) in addition to those already published from Calahoyo (Cingulata Macrochorobates chapadmalensis, Eosclerocalyptus sp. and the Megatheriidae Pyramiodontherium bergi) suggest a Middle Miocene to Late Miocene age for the bearing levels. In Calahoyo, the presence of Stenotatus sp. nov. in addition to some rodents currently under study in the lower levels, suggests a closer paleofaunistic similitude with the palaeofauna of Cerdas (southern Bolivia), involving probably the last part of the Miocene Climatic Optimum. The Xenarthra recorded in middle and upper levels both of Calahoyo and Casira, suggest a late Miocene (or earliest Pliocene?) age, showing some resemblance with those registered in the Late Miocene (?Araucanian?) of northwestern Argentina. A comparative analysis between Calahoyo and Casira highlight the absence of Cingulata in the latter and a high diversity in the former. This situation probably evidences different paleoenvironmental conditions. Finally, we present the oldest record of dermal ossicles for Pilosa in South America.