New Remains of <i>Megathericulus patagonicus</i> Ameghino, 1904 (Xenarthra, Tardigrada) from the Serravallian (Middle Miocene) of Bolivia; Chronological and Biogeographical Implications

In this contribution, we describe new remains (skull and humeri) of the Megatheriinae Megathericulus patagonicus Ameghino, 1904, recovered from the middle Miocene fossiliferous locality of Quebrada Honda, Bolivia. We also discuss the taxonomic, biogeographical, and chronological relevance of this di...

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Autores principales: Brandoni, Diego, Carlini, Alfredo Armando, Anaya, Federico, Gans, Phil, Croft, Darin A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Naturales
Megatheriinae
Folivora
South America
Ground sloths
40Ar/39Ar dating
U-Pb dating
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/132238
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-132238
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Megatheriinae
Folivora
South America
Ground sloths
40Ar/39Ar dating
U-Pb dating
spellingShingle Ciencias Naturales
Megatheriinae
Folivora
South America
Ground sloths
40Ar/39Ar dating
U-Pb dating
Brandoni, Diego
Carlini, Alfredo Armando
Anaya, Federico
Gans, Phil
Croft, Darin A.
New Remains of <i>Megathericulus patagonicus</i> Ameghino, 1904 (Xenarthra, Tardigrada) from the Serravallian (Middle Miocene) of Bolivia; Chronological and Biogeographical Implications
topic_facet Ciencias Naturales
Megatheriinae
Folivora
South America
Ground sloths
40Ar/39Ar dating
U-Pb dating
description In this contribution, we describe new remains (skull and humeri) of the Megatheriinae Megathericulus patagonicus Ameghino, 1904, recovered from the middle Miocene fossiliferous locality of Quebrada Honda, Bolivia. We also discuss the taxonomic, biogeographical, and chronological relevance of this discovery. Referral of the new specimens described here to Megathericulus patagonicus is based on metric and morphological similarities with the holotype and a humerus that has been referred to this species. Shared features include: 1) molariforms that are mesiodistally compressed and rectangular in outline; 2) a relatively less compressed M1 with labial and lingual margins that converge slightly mesially; 3) a very long premolariform portion of the maxillae (rostrum); 4) anteriorly divergent lateral edges of the maxillae; 5) a prominent, median V-shaped notch (apex posterior) between the articular surfaces of the maxillae and premaxillae; and 6) a long, gracile humerus with a prominent anterolaterally positioned deltopectoral crest on the anterior surface and a clearly evident lateral musculo-spiral channel. Precise geographic and stratigraphic data exist for the described remains, which are closely associated with a tuff dated at 12.2–12.5 Ma (Serravallian, middle Miocene), making it the first accurately dated specimen referred to Megathericulus Ameghino, 1904.
format Articulo
Articulo
author Brandoni, Diego
Carlini, Alfredo Armando
Anaya, Federico
Gans, Phil
Croft, Darin A.
author_facet Brandoni, Diego
Carlini, Alfredo Armando
Anaya, Federico
Gans, Phil
Croft, Darin A.
author_sort Brandoni, Diego
title New Remains of <i>Megathericulus patagonicus</i> Ameghino, 1904 (Xenarthra, Tardigrada) from the Serravallian (Middle Miocene) of Bolivia; Chronological and Biogeographical Implications
title_short New Remains of <i>Megathericulus patagonicus</i> Ameghino, 1904 (Xenarthra, Tardigrada) from the Serravallian (Middle Miocene) of Bolivia; Chronological and Biogeographical Implications
title_full New Remains of <i>Megathericulus patagonicus</i> Ameghino, 1904 (Xenarthra, Tardigrada) from the Serravallian (Middle Miocene) of Bolivia; Chronological and Biogeographical Implications
title_fullStr New Remains of <i>Megathericulus patagonicus</i> Ameghino, 1904 (Xenarthra, Tardigrada) from the Serravallian (Middle Miocene) of Bolivia; Chronological and Biogeographical Implications
title_full_unstemmed New Remains of <i>Megathericulus patagonicus</i> Ameghino, 1904 (Xenarthra, Tardigrada) from the Serravallian (Middle Miocene) of Bolivia; Chronological and Biogeographical Implications
title_sort new remains of <i>megathericulus patagonicus</i> ameghino, 1904 (xenarthra, tardigrada) from the serravallian (middle miocene) of bolivia; chronological and biogeographical implications
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/132238
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