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Formation of the Isthmus of Panama
TLDR
An exhaustive review and reanalysis of geological, paleontological, and molecular records converge upon a cohesive narrative of gradually emerging land and constricting seaways, with formation of the Isthmus of Panama sensu stricto around 2.8 Ma.
Mitochondrial genomes reveal an explosive radiation of extinct and extant bears near the Miocene-Pliocene boundary
TLDR
Molecular dating of the mtDNA divergence times suggests a rapid radiation of bears in both the Old and New Worlds around 5 million years ago, at the Miocene-Pliocene boundary, which coincides with major global changes, such as the Messinian crisis and the first opening of the Bering Strait, and suggests a global influence of such events on species radiations.
Miocene vertebrates from Entre Ríos province , eastern Argentina
Resumen.VERTEBRADOS DEL MIOCENO DE LA PROVINCIA DE ENTRE RÍOS, ARGENTINA. La diversa fauna de antiguos vertebrados que se registra en los acantilados que bordean la margen oriental del río Paraná
Did Humans Cause the Late Pleistocene-Early Holocene Mammalian Extinctions in South America in a Context of Shrinking Open Areas?
Capitulo VII de Haynes, Gary (ed). American megafaunal extinctions at the end of the Pleistocene. Springer, Vertebrate Paleobiology and Paleoanthropology Series, 2009, 202 p. + 32 il. ISBN
Carnivorans at the Great American Biotic Interchange: new discoveries from the northern neotropics
TLDR
The phylogenetic analysis that includes the two new findings support the view that procyonids dispersed from North America in two separate events, which involved reciprocal lineage migrations from North to South America, and included the evolution of South American endemic forms.
First evidence of scavenging of a Glyptodont (Mammalia, Glyptodontidae) from the Pliocene of the Pampean region (Argentina): taphonomic and paleoecological remarks
The Cingulata Glyptodontidae (Xenarthra) are one of the most conspicuous Cenozoic herbivore clades in South America reaching North America during the Great American Biotic Interchange. The evidence
Inferring palaeoecology in extinct tremarctine bears (Carnivora, Ursidae) using geometric morphometrics
TLDR
The results reveal different ecomorphological specializations in extinct tremarctines during the Plio-Pleistocene of South America, which strongly supports that bears are one of the most ecologically and morphologically adaptable members of the large carnivore guild.
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