INVESTIGADORES
MIÑO BOILINI Angel Ramon
congresos y reuniones científicas
Título:
GLYPTODONTIDAE (XENARTHRA, CINGULATA) OF THE TARIJA VALLEY (BOLIVIA): SYSTEMATIC, DIVERSITY, BIOSTRATIGRAPHIC AND PALEOBIOGEOGRAPHIC ASPECTS OF A PARTICULAR ASSEMBLAGE
Autor/es:
ZURITA, A.E.; MIÑO BOILINI, ANGEL R.; SOILBELZON, E; CARILINI, A.A.; PAREDES-RIOS, F
Lugar:
Neuquén
Reunión:
Congreso; III Congreso Latinoamericano de Plaeontología de Vertebrados; 2008
Resumen:
The Tarija Valley (21º 31´ S and 64º 43´ W) is located approximately 1000 km south from La Paz (Bolivia) and it extends for approx. 4500 km2, at nearly 2000 m above sea level (MacFadden and Shockey, 1997). From a historical perspective, the sedimentary sequences that crop out in Tarija Valley have been successively assigned to different ages and stages ranging from the Lower to the Upper Pleistocene (see, among others, Ameghino, 1902; MacFadden, 2000; Coltorti et al., 2007). In this context, the faunal assemblage of Cingulata Glyptodontidae is among the most frequent elements of the known megafauna for this place (Hoffstetter, 1963; Werdelin, 1991; Coltorti et al., 2007). Here, a revaluation on the main systematic, biostratigraphic and paleobiogeographic aspects of it, are presented, and reinterpreted its diversity. The Glyptodontidae assemblage of this area is unique with respect to faunas known for other areas of South America. The abundance of Glyptodon Owen, and the scarcity or absence of Panochthus Burmeister and Neosclerocalyptus Paula-Couto, that are very frequent in the fossil record of the Pampean and north-central regions of Argentina, are noteworthy features. The validity of Hoplophorus echazui Hoffstetter, as well as the presence of H. euphractus Lund and P. tuberculatus (Owen) is questioned pending the finding of more diagnostic remains, and all the records assigned to Neothoracophorus Ameghino very probably corresponded to subadult Glyptodon specimens. Biostratigraphically, all but one of the Glyptodon specimens are highly morphologically similar to those from the upper middle Pleistocene- early Holocene (Bonaerian-Lujanian) of the Pampean region in Argentina. However, one of the studied specimens (MNPA-v 006118) from the Armados locality corresponds to G. munizi Ameghino, restricted to the Ensenadan (late Pliocene- early middle Pleistocene) in the Pampean region (Soibelzon et al., 2006).