ZURITA Alfredo Eduardo
congresos y reuniones científicas
The southernmost record of a Neuryurini Hoffstetter (Mammalia, Xenarthra, Glyptodontidae)
GONZALEZ-RUIZ, L.; ZURITA, A. E; FLEAGLE, J.; SCILLATO-YANÉ, G. J.; DOZO, M.T.; ZAMORANO, M.
Jornada; Reunión Anual de Comunicaciones de la APA; 2009
Here we document the southernmost and probably the oldest record of the tribe Neuryurini (Glyptodontidae). The oldest record of this tribe corresponds to the genus Pseudoeuryurus Ameghino (Mesopotamiense, late Miocene-Pliocene) and Urotherium Castellanos (Araucanense, late Miocene-Pliocene), but both taxa are placed tentatively within the Neuryurini. The southernmost record of this tribe out of Patagonia is Neuryurus sp. from Lujanian sediments (Luján Formation, late Pleistocene early Holocene) at Quequén Grande river (Buenos Aires Province). The first and only record of a specimen of the Neuryurini in Patagonia was reported from the upper levels of the Puerto Madryn Formation (Huayquerian Age, late Miocene), exposed in Península Valdez (Chubut Province, Argentina); it is an isolated osteoderm assigned to Neuryurini indet. (MPEF-PV 2533). The new record consists of two associated, well preserved osteoderms (MPM-PV 1868) also assigned to an indeterminate Neuryurini, recovered as a surface find at Estancia La Peninsular, Santa Cruz Province, Argentina. This locality has been recognized in geological studies as part of the Santa Cruz Formation (Santacrucian Age, late-early Miocene) and there were no reported fossil records until now. Further studies will be need to determine of there are younger desposits present. It is noted that the tribe Neuryurini is absent in all other Santacrucian and Friasian (middle Miocene) deposits. Therefore, the new specimen represents the southernmost member of that tribe discovered up to now, and with the two confirmed records of Glyptodon Owen and Panochthus Burmeister (both from the Quaternary) arethe only non-Propalaehoplophorinae glyptodontids reported for Santa Cruz Province