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

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....

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Detalles Bibliográficos
Autores principales: Schubert, Blaine W., Soibelzon, Leopoldo Héctor
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Paleontología
Ciencias Naturales
oso
Ensenada, Argentina
Tamaño Corporal
early Pleistocene
Carnívoros
Arctotherium angustidens
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/5360
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-5360
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
Ciencias Naturales
oso
Ensenada, Argentina
Tamaño Corporal
early Pleistocene
Carnívoros
Arctotherium angustidens
spellingShingle Paleontología
Ciencias Naturales
oso
Ensenada, Argentina
Tamaño Corporal
early Pleistocene
Carnívoros
Arctotherium angustidens
Schubert, Blaine W.
Soibelzon, Leopoldo Héctor
The largest known bear, Arctotherium angustidens, from the early Pleistocene pampeam region of Argentina: with a discussion of size and diet trends in bears
topic_facet Paleontología
Ciencias Naturales
oso
Ensenada, Argentina
Tamaño Corporal
early Pleistocene
Carnívoros
Arctotherium angustidens
description 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
format Articulo
Articulo
author Schubert, Blaine W.
Soibelzon, Leopoldo Héctor
author_facet Schubert, Blaine W.
Soibelzon, Leopoldo Héctor
author_sort Schubert, Blaine W.
title The largest known bear, Arctotherium angustidens, from the early Pleistocene pampeam region of Argentina: with a discussion of size and diet trends in bears
title_short The largest known bear, Arctotherium angustidens, from the early Pleistocene pampeam region of Argentina: with a discussion of size and diet trends in bears
title_full The largest known bear, Arctotherium angustidens, from the early Pleistocene pampeam region of Argentina: with a discussion of size and diet trends in bears
title_fullStr The largest known bear, Arctotherium angustidens, from the early Pleistocene pampeam region of Argentina: with a discussion of size and diet trends in bears
title_full_unstemmed The largest known bear, Arctotherium angustidens, from the early Pleistocene pampeam region of Argentina: with a discussion of size and diet trends in bears
title_sort largest known bear, arctotherium angustidens, from the early pleistocene pampeam region of argentina: with a discussion of size and diet trends in bears
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/5360
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