Continental Relationships, Chronostratigraphy, Climates, and Mammalian Biogeography of Southern South America Since Late Miocene

2015 ◽  
pp. 9-69 ◽  
Author(s):  
Alberto Luis Cione ◽  
Germán Mariano Gasparini ◽  
Esteban Soibelzon ◽  
Leopoldo Héctor Soibelzon ◽  
Eduardo Pedro Tonni
Keyword(s):  
South America ◽  
Late Miocene ◽  
Southern South America

Paralonchothrix gen. nov., the first record of Echimyini (Rodentia, Octodontoidea) in the late Miocene of Southern South America

2021 ◽  
pp. 1-12
Author(s):  
Pedro PIÑERO ◽  
A. Itatí OLIVARES ◽  
Diego H. VERZI ◽  
Victor H. CONTRERAS
Keyword(s):  
South America ◽  
Late Miocene ◽  
New Genus ◽  
Sister Group ◽  
First Record ◽  
Northwestern Argentina ◽  
Southern South America ◽  
Evolutionary Pattern ◽  
Minimum Age ◽  
First Time

ABSTRACT Echimyidae is the most widely diversified family among hystricognath rodents, both in the number of species and variety of lifestyles. In the Patagonian Subregion of southern South America, extinct echimyids related to living arboreal species (Echimyini) are recorded up to the middle Miocene, whereas all the known southern fossils since the late Miocene are linked to terrestrial and fossorial lineages currently inhabiting the Chacoan open biome in eastern South America. In this work, we describe a new genus of echimyid rodent, Paralonchothrix gen. nov., from the late Miocene of northwestern Argentina and western Brazil. Its single recognised species, Paralonchothrix ponderosus comb. nov., is represented by two hemimandibles. One of them comes from a level of Loma de Las Tapias Formation, underlying a tuff dated at 7.0 ± 0.9 Ma (Huayquerian age, late Miocene); the other specimen comes from the ‘Araucanense’ of Valle de Santa María (type locality, Huayquerian age, late Miocene). A phylogenetic analysis linked Paralonchothrix to Lonchothrix, both being the sister group to Mesomys. Thereby, for the first time, an echimyid linked to living Amazonian arboreal clades is recognised for the late Miocene of southern South America. Paralonchothrix gen. nov. thus represents an exceptional record that raises the need to review the postulated evolutionary pattern for echimyids recorded at high latitudes since the late Miocene. The new genus provides a minimum age (ca.7 Ma) in the fossil record for the divergence between Mesomys and Lonchothrix. The palaeoenvironmental conditions inferred for the late Miocene in western and northwestern Argentina suggest savanna-type environments, with areas with more closed woodlands in peri-Andean valleys. The record of Paralonchothrix gen. nov. supports the hypothesis that this area would have maintained connections with tropical biomes of northern South America during the late Miocene.

A new Echimyidae (Rodentia, Hystricomorpha) from the late Miocene of southern South America

2016 ◽  
Vol 37 (1) ◽  
pp. e1239204 ◽  
Author(s):  
A. Itatí Olivares ◽  
Diego H. Verzi ◽  
Victor H. Contreras ◽  
Leila Pessôa
Keyword(s):  
South America ◽  
Late Miocene ◽  
Southern South America

A New Glyptodont (Xenarthra: Cingulata) from the Late Miocene of Argentina: New Clues About the Oldest Extra-Patagonian Radiation in Southern South America

2022 ◽  
Author(s):  
Daniel Barasoain ◽  
Alfredo E. Zurita ◽  
Darin A. Croft ◽  
Claudia I. Montalvo ◽  
Víctor H. Contreras ◽  
...  
Keyword(s):  
South America ◽  
Late Miocene ◽  
Southern South America

Evolutionary pattern of Metacaremys gen. nov. (Rodentia, Octodontidae) and its biochronological implications for the late Miocene and early Pliocene of southern South America

2021 ◽  
Author(s):  
Pedro Piñero ◽  
Diego H. Verzi ◽  
A. Itatí Olivares ◽  
Claudia I. Montalvo ◽  
Rodrigo L. Tomassini ◽  
...  
Keyword(s):  
South America ◽  
Late Miocene ◽  
Southern South America ◽  
Early Pliocene ◽  
Evolutionary Pattern

Additions to the Placopsis mycobiota (Trapeliaceae, Ascomycota) of southern South America, with notes on new records (including Aspiciliopsis macrophthalma), and a revised regional key to the species

2010 ◽  
Vol 42 (6) ◽  
pp. 727-737 ◽  
Author(s):  
David J. GALLOWAY
Keyword(s):  
South America ◽  
New Records ◽  
Southern South America ◽  
First Time

AbstractAspiciliopsis macrophthalma, Placopsis fusciduloides, P. gelidioides and P. tararuana are reported for the first time from southern South America. New records for 13 species of Placopsis in southern South America are reported, and a revised key to 22 species of Placopsis and A. macrophthalma in the region is given.

scholarly journals Unravelling the identity ofPandoraspecies (Bivalvia: Pandoridae) from southern South America

2016 ◽  
Vol 82 (3) ◽  
pp. 440-448 ◽  
Author(s):  
Marina Güller ◽  
Diego G. Zelaya
Keyword(s):  
South America ◽  
Southern South America
Sign in / Sign up

Export Citation Format

Share Document