INVESTIGADORES
CARLINI Alfredo Armando
congresos y reuniones científicas
Título:
The diversity of Glyptodontidae (Xenarthra, Cingulata) in the Tarija Valley (Bolivia): systematic, biostratigraphic and paleobiogeographic aspects of a particular assemblage.
Autor/es:
12. ZURITA, A.E., MIÑO-BOILINI, A.R., SOIBELZON, E., CARLINI, A.A., & PAREDES RÍOS, F.
Lugar:
NEUQUÉN
Reunión:
Congreso; III Congreso Latinoamericano de Paleontología 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).