scholarly journals Chaetophractus vellerosus (Mammalia: Dasypodidae) in the Ensenadan (Early - Middle Pleistocene) of the southeastern Pampean region (Argentina). Paleozoogeographical and paleoclimatic aspects

2007 ◽  
Vol 2006 (12) ◽  
pp. 734-748 ◽  
Author(s):  
Esteban Soibelzon ◽  
Alfredo Armando Carlini ◽  
Eduardo Pedro Tonni ◽  
Leopoldo Héctor Soibelzon
Keyword(s):  
Middle Pleistocene ◽  
Pampean Region

The largest known bear, Arctotherium angustidens, from the early Pleistocene Pampean region of Argentina: with a discussion of size and diet trends in bears

2011 ◽  
Vol 85 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Leopoldo H. Soibelzon ◽  
Blaine W. Schubert
Keyword(s):  
South America ◽  
Early Pleistocene ◽  
Middle Pleistocene ◽  
Buenos Aires Province ◽  
South American ◽  
Pampean Region ◽  
Great American Biotic Interchange ◽  
Epiphyseal Fusion ◽  
Evolutionary Trajectories ◽  
Serious Injuries

The South American giant short-faced bear (Arctotherium angustidens Gervais and Ameghino, 1880) is one of five described Arctotherium species endemic to South America and it is known for being the earliest, largest, and most carnivorous member of the genus. Here we report an extraordinarily large A. angustidens individual exhumed from Ensenadan sediments (early to middle Pleistocene) at Buenos Aires Province, Argentina. Based on overall size, degree of epiphyseal fusion, and pathologies, this bear was an old-aged male that sustained serious injuries during life. Body mass of the bear is estimated and compared to other ursid species based on a series of allometric equations. To our knowledge, this specimen now represents the largest bear ever recorded. In light of this discovery, we discuss the evolution of body size in Arctotherium (from large-to-small) and compare this to bears that exhibited different evolutionary trajectories. We suggest that the larger size and more carnivorous nature of A. angustidens, compared to later members of the genus, may reflect the relative lack of other large carnivores and abundance of herbivores in South America just after the Great American Biotic Interchange.

scholarly journals Fossil record of a Characiform in the Monte Hermoso Formation (lower Pliocene), Buenos Aires, Argentina. Palaeobiogeographical implications

2021 ◽  
Author(s):  
Sergio BOGAN ◽  
Federico AGNOLIN ◽  
Juan Marcos MIRANDE
Keyword(s):  
Fossil Record ◽  
Buenos Aires ◽  
Indirect Evidence ◽  
Middle Pleistocene ◽  
Buenos Aires Province ◽  
Present Contribution ◽  
Southern Boundary ◽  
Pampean Region ◽  
First Time ◽  
Late Middle Pleistocene

The fossil record of fishes from the Farola de Monte Hermoso locality (lower Pliocene) in the southern Buenos Aires province, Argentina, shows an unusual composition. The locality at the southern boundary of the Brazilian Ichthyogeographic Realm. However, its fossil record is composed of fossil fishes that are not necessarily related to Brazilian lineages, namely indeterminate siluriforms, trichomycterid catfishes, and percomorphaceans. The aim of the present contribution is to describe and report for the first time isolated specimens belonging to Characidae fishes. In the Pampean region the fossil record of characids is restricted to Oligosarcus Günther, 1864 sp. from the late-middle Pleistocene. The present finding fills a temporal gap between the Paleogene and Quaternary reports and indicates that Brazilian fish lineages were present in the area by early Pliocene times, and may constitute an indirect evidence of the evolution of the basins in the southern Pampean Area.

The Middle Pleistocene Pebble Tool Site of Durkadi in Central India

Paléorient ◽  
1979 ◽  
Vol 5 (1) ◽  
pp. 105-144 ◽  
Author(s):  
Jorge Armand
Keyword(s):  
Central India ◽  
Middle Pleistocene
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