Systematic revision and evolutionary history of Acarechimys Patterson in Kraglievich, 1965 (Rodentia, Caviomorpha, Octodontoidea)

The octodontoid rodent Acarechimys was abundant during the early Miocene and had the widest temporal and geographic distribution of any extinct caviomorph. Despite this extensive fossil record Acarechimys has not been well characterized. In this work, we systematically revise Acarechimys, describe n...

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Autores principales: Arnal, Michelle, Vucetich, María Giomar, Croft, Darin A., Bargo, M. Susana, Fernícola, Juan Carlos, Vizcaíno, Sergio Fabián
Formato: Articulo
Lenguaje:Español
Publicado: 2017
Materias:
Paleontología
Octodontoid
Oligocene
Miocene
Evolutionary history
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/74913
http://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/3048
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-74913
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Paleontología
Octodontoid
Oligocene
Miocene
Evolutionary history
spellingShingle Paleontología
Octodontoid
Oligocene
Miocene
Evolutionary history
Arnal, Michelle
Vucetich, María Giomar
Croft, Darin A.
Bargo, M. Susana
Fernícola, Juan Carlos
Vizcaíno, Sergio Fabián
Systematic revision and evolutionary history of Acarechimys Patterson in Kraglievich, 1965 (Rodentia, Caviomorpha, Octodontoidea)
topic_facet Paleontología
Octodontoid
Oligocene
Miocene
Evolutionary history
description The octodontoid rodent Acarechimys was abundant during the early Miocene and had the widest temporal and geographic distribution of any extinct caviomorph. Despite this extensive fossil record Acarechimys has not been well characterized. In this work, we systematically revise Acarechimys, describe new early–middle Miocene fossils from Argentina and Bolivia, corroborate its monophyly, and study its evolutionary history. Acarechimys has brachydont molars, retained deciduous premolars, four crests on upper molars, lowers with variably developed mesolophid and metalophulid II, and absence of mental foramen in the mandible. Acarechimys includes: Acarechimys leucotheae (late Oligocene, Chubut, Argentina), A. gracilis and A. constans (early Miocene, Chubut and Santa Cruz, Argentina), and A. minutus and A. minutissimus (early– middle Miocene of Patagonia Argentina, Bolivia, and Colombia). The temporal and geographic distributions suggest that Acarechimys could have evolved in Patagonia, by the early late Oligocene. Its acme was during the late early Miocene in Southern Patagonia. By the middle Miocene, Acarechimys decreased in diversity and was last recorded in high latitudes of South America (Patagonia). In lower latitudes, the oldest record is from the late early Miocene of Chucal, northern Chile, and during the late middle Miocene, the genus is recorded in localities of Colombia, Bolivia, and Peru. The available evidence suggests that Acarechimys was probably not present in lower latitudes (N of ~ 30° S) before the early Miocene. The reasons Acarechimys dispersed northward at this time remain to be elucidated, but the timing coincides with a massive disappearance of other octodontoids from Patagonia.
format Articulo
Articulo
author Arnal, Michelle
Vucetich, María Giomar
Croft, Darin A.
Bargo, M. Susana
Fernícola, Juan Carlos
Vizcaíno, Sergio Fabián
author_facet Arnal, Michelle
Vucetich, María Giomar
Croft, Darin A.
Bargo, M. Susana
Fernícola, Juan Carlos
Vizcaíno, Sergio Fabián
author_sort Arnal, Michelle
title Systematic revision and evolutionary history of Acarechimys Patterson in Kraglievich, 1965 (Rodentia, Caviomorpha, Octodontoidea)
title_short Systematic revision and evolutionary history of Acarechimys Patterson in Kraglievich, 1965 (Rodentia, Caviomorpha, Octodontoidea)
title_full Systematic revision and evolutionary history of Acarechimys Patterson in Kraglievich, 1965 (Rodentia, Caviomorpha, Octodontoidea)
title_fullStr Systematic revision and evolutionary history of Acarechimys Patterson in Kraglievich, 1965 (Rodentia, Caviomorpha, Octodontoidea)
title_full_unstemmed Systematic revision and evolutionary history of Acarechimys Patterson in Kraglievich, 1965 (Rodentia, Caviomorpha, Octodontoidea)
title_sort systematic revision and evolutionary history of acarechimys patterson in kraglievich, 1965 (rodentia, caviomorpha, octodontoidea)
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/74913
http://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/3048
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