Revision of the fossil rodent Acaremys Ameghino, 1887 (Hystricognathi, Octodontoidea, Acaremyidae) from the Miocene of Patagonia (Argentina) and the description of a new acaremyid

Within South American rodents, the Acaremyidae is an independent fossil lineage of octodontoids represented in the late Oligocene–middle Miocene of Patagonia. Acaremys is represented by six species recorded in the early Miocene, which have not been re-studied since their original description. Morpho...

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Detalles Bibliográficos
Autores principales: Arnal, Michelle, Vucetich, María Guiomar
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Paleontología
Acaremys
Octodontoidea
Phylogeny
Systematics
Santa Cruz Province
Miocene
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/127547
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-127547
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Paleontología
Acaremys
Octodontoidea
Phylogeny
Systematics
Santa Cruz Province
Miocene
spellingShingle Paleontología
Acaremys
Octodontoidea
Phylogeny
Systematics
Santa Cruz Province
Miocene
Arnal, Michelle
Vucetich, María Guiomar
Revision of the fossil rodent Acaremys Ameghino, 1887 (Hystricognathi, Octodontoidea, Acaremyidae) from the Miocene of Patagonia (Argentina) and the description of a new acaremyid
topic_facet Paleontología
Acaremys
Octodontoidea
Phylogeny
Systematics
Santa Cruz Province
Miocene
description Within South American rodents, the Acaremyidae is an independent fossil lineage of octodontoids represented in the late Oligocene–middle Miocene of Patagonia. Acaremys is represented by six species recorded in the early Miocene, which have not been re-studied since their original description. Morphological and phylogenetic analyses suggest that Acaremys is paraphyletic. Three species are valid, Acaremys murinus, Acaremys major, and Acaremys messor. Acaremys karaikensis is a junior synonym of Acaremys murinus. ‘Acaremys’ tricarinatus is excluded from the genus being closely related to Sciamys. The new species, Pseudoacaremys kramarzi, is closely related to ‘Acaremys’ tricarinatus and Sciamys. ‘Acaremys’ preminutus is excluded from the family being closely related to the early Miocene Protacaremys prior, or living octodontoids. The phylogenetic analysis demonstrated that Acaremyidae includes Platypittamys, Galileomys, Acaremys, Pseudoacaremys and Sciamys. The new acaremyid increases the diversity of extinct octodontoids and added a new evolutionary lineage within Acaremyidae. The evolutionary history of the superfamily suggests that the hypsodonty and the consequently occlusal simplification evolved twice within Octodontoidea: in Acaremyidae and in Octodontidae. In addition, the cladistic analysis confirmed that most character ambiguities are due to missing data, and hence, it is essential to find better remains to elucidate the relationships among acaremyids.
format Articulo
Articulo
author Arnal, Michelle
Vucetich, María Guiomar
author_facet Arnal, Michelle
Vucetich, María Guiomar
author_sort Arnal, Michelle
title Revision of the fossil rodent Acaremys Ameghino, 1887 (Hystricognathi, Octodontoidea, Acaremyidae) from the Miocene of Patagonia (Argentina) and the description of a new acaremyid
title_short Revision of the fossil rodent Acaremys Ameghino, 1887 (Hystricognathi, Octodontoidea, Acaremyidae) from the Miocene of Patagonia (Argentina) and the description of a new acaremyid
title_full Revision of the fossil rodent Acaremys Ameghino, 1887 (Hystricognathi, Octodontoidea, Acaremyidae) from the Miocene of Patagonia (Argentina) and the description of a new acaremyid
title_fullStr Revision of the fossil rodent Acaremys Ameghino, 1887 (Hystricognathi, Octodontoidea, Acaremyidae) from the Miocene of Patagonia (Argentina) and the description of a new acaremyid
title_full_unstemmed Revision of the fossil rodent Acaremys Ameghino, 1887 (Hystricognathi, Octodontoidea, Acaremyidae) from the Miocene of Patagonia (Argentina) and the description of a new acaremyid
title_sort revision of the fossil rodent acaremys ameghino, 1887 (hystricognathi, octodontoidea, acaremyidae) from the miocene of patagonia (argentina) and the description of a new acaremyid
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/127547
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