New Eocene South American native ungulates from the Quebrada de los Colorados Formation at Los Cardones National Park, Argentina

In the last few years, the Quebrada de Los Colorados Formation has become an important middle Eocene fossiliferous unit in Northwestern Argentina. In this unit, the South American native ungulates were until now only represented by the order Notoungulata, including one family of Typotheria and three...

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Detalles Bibliográficos
Autores principales: Fernández, Mercedes, Zimicz, Ana Natalia, Bond, Mariano, Chornogubsky, Laura, Arnal, Michelle, Cárdenas, M., Fernícola, Juan Carlos
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Paleontología
Mammalia
South American native ungulates
Casamayoran SALMA
Paleogene
Quebrada de Los Colorados Formation
Argentina
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/118827
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-118827
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
Mammalia
South American native ungulates
Casamayoran SALMA
Paleogene
Quebrada de Los Colorados Formation
Argentina
spellingShingle Paleontología
Mammalia
South American native ungulates
Casamayoran SALMA
Paleogene
Quebrada de Los Colorados Formation
Argentina
Fernández, Mercedes
Zimicz, Ana Natalia
Bond, Mariano
Chornogubsky, Laura
Arnal, Michelle
Cárdenas, M.
Fernícola, Juan Carlos
New Eocene South American native ungulates from the Quebrada de los Colorados Formation at Los Cardones National Park, Argentina
topic_facet Paleontología
Mammalia
South American native ungulates
Casamayoran SALMA
Paleogene
Quebrada de Los Colorados Formation
Argentina
description In the last few years, the Quebrada de Los Colorados Formation has become an important middle Eocene fossiliferous unit in Northwestern Argentina. In this unit, the South American native ungulates were until now only represented by the order Notoungulata, including one family of Typotheria and three of Toxodontia. In this contribution, we present a new faunistic assemblage of South American native ungulates, collected from outcrops of the Quebrada de Los Colorados Formation at Los Cardones National Park, Calchaquí Valleys, Salta Province (Argentina). This new assemblage is constituted by the following taxa: litoptern Didolodontidae cf. Ernestokokenia sp., Astrapotheria indet., and notoungulate Notostylopidae Homalostylops sp., a ?Homalostylops sp., typothere “Oldfieldthomasiidae” Colbertia falui sp. nov., Colbertia lumbrerense, and Colbertia sp. and toxodont “Notohippidae” Pampahippus secundus. Colbertia falui sp. nov. differs from the other species of Colbertia by the following features: lower cheek teeth with both more labially angular and oblique trigonid; lower premolars more labio-lingually compressed; with proportionally larger trigonid, and shorter talonid; ectoflexid transversally deeper; lower molars with a more developed paralophid, and more expanded metalophid and entoconid; the latter is located in a more mesial position, being closer to the metaconid; deep and lingually narrower talonid basin; disto-lingual sulcus transversally shallower; more developed cingulids; and m3 with less lingually projected hypoconulid. This new fauna markedly increases the taxonomic richness known for this formation since it includes the first mention of notostylopids, “oldfieldthomasiids”, litoptern didolodontids, and astrapotheres. With the current evidence, we postulate an ungulate migration from Patagonia to Northwestern Argentina during the Eocene. We also hypothesize that the observed taxonomic differences among the Quebrada de Los Colorados, Geste, and Lumbrera formations are more probably associated to orogenic factors that have regulated the faunal dynamic in Northwestern Argentina during the Paleogene than to a differential sampling effort or taphonomic biases.
format Articulo
Articulo
author Fernández, Mercedes
Zimicz, Ana Natalia
Bond, Mariano
Chornogubsky, Laura
Arnal, Michelle
Cárdenas, M.
Fernícola, Juan Carlos
author_facet Fernández, Mercedes
Zimicz, Ana Natalia
Bond, Mariano
Chornogubsky, Laura
Arnal, Michelle
Cárdenas, M.
Fernícola, Juan Carlos
author_sort Fernández, Mercedes
title New Eocene South American native ungulates from the Quebrada de los Colorados Formation at Los Cardones National Park, Argentina
title_short New Eocene South American native ungulates from the Quebrada de los Colorados Formation at Los Cardones National Park, Argentina
title_full New Eocene South American native ungulates from the Quebrada de los Colorados Formation at Los Cardones National Park, Argentina
title_fullStr New Eocene South American native ungulates from the Quebrada de los Colorados Formation at Los Cardones National Park, Argentina
title_full_unstemmed New Eocene South American native ungulates from the Quebrada de los Colorados Formation at Los Cardones National Park, Argentina
title_sort new eocene south american native ungulates from the quebrada de los colorados formation at los cardones national park, argentina
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/118827
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