Papers by Julieta Armenta Perez
Zoology
Rodents of the family Octodontidae, endemic to South America, represent a group with low taxonomi... more Rodents of the family Octodontidae, endemic to South America, represent a group with low taxonomic richness group (six genera and 14 species) but have great ecomorphological diversity with epigean, semi-fossorial, fossorial, and subterranean forms. We analyzed morphometric variation in humerus and ulna, the possible relationship with substrate preference use, and the presence of a phylogenetic signal in the forelimbs traits (five biomechanical indices). Our results show that, in octodontids, the forelimb variation was not primarily associated with their phylogeny and some attributes are highly explanatory in terms of function, with a clear differentiation between the substrate use gradient extremes (i.e. epigean and subterranean forms). The two forelimb traits, the development of humeral epicondyles and the olecranon process of the ulna, indicative of adaptive trends found in Octodontidae are consistent with most of those described for other mammals and corroborate the relevance of forelimb characters to differentiate modes of locomotion or substrate preferences.
The genus Spalacopus includes only one species, S . cyanus , endemic to central Chile and one of ... more The genus Spalacopus includes only one species, S . cyanus , endemic to central Chile and one of the species best adapted to a subterranean lifetyle in the family Octodontidae. It is a member of the lineage consisting in Octodontomys as a sister clade containing Octodon and of a clade represented by Spalacopus and Aconaemys . Although the external and cranio-dental morphology have been well studied, little is known of the postcranial morphology of S . cyanus . Because of the peculiarities of its lifestyle and locomotion among the members of the family, it is interesting to characterize details of the morphology of the postcranial skeleton of this species and to infer their functional aspects of the morphology. Twenty-nine specimens with postcranial material stored in two collections were studied: Museo de La Plata (MLP), La Plata, Buenos Aires, Argentina and Coleccion de Mamiferos del Instituto de Ciencias Ambientales y Evolutivas (UACH), Universidad Austral de Chile, Valdivia,...
Acta Tropica, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Mammalian Species, 2018
The genus Octodontomys contains only a single species, Octodontomys gliroides (P. Gervais and d'O... more The genus Octodontomys contains only a single species, Octodontomys gliroides (P. Gervais and d'Orbigny, 1844), the mountain degu, found in Andean and Sub-Andean regions of 3 countries, Argentina, Bolivia, and Chile, from elevations of about 1,200-4,400 m. This fossorial octodontid is typical of dry areas, inhabits rocky zones, and is active during the day and the first few hours of night. It is not of special conservation status, being common throughout its distribution, and is considered a species of "Least Concern."
Historical Biology, 2019
We describe the first fossil record of Paramyocastor diligens (Echimyidae, Octodontoidea) from th... more We describe the first fossil record of Paramyocastor diligens (Echimyidae, Octodontoidea) from the Pliocene of Las Cañas Formation (western Santiago del Estero Province, Argentina). The new record of this species increases its geographical distribution, previously known from Catamarca, Entre Ríos, and Buenos Aires Provinces. The examined materials correspond to a fragmentary hemimandible with m2-m3 and an isolated lower molar, which provide information on the occlusal morphology of Paramyocastor diligens in early ontogenetic stages.
ZooKeys, 2017
Here, a detailed description of the forelimbs and hindlimbs of all living species of the genus Ty... more Here, a detailed description of the forelimbs and hindlimbs of all living species of the genus Tympanoctomys are presented. These rodents, highly adapted to desert environments, are semi-fossorial with capacity to move on the surface as well as to build burrows. The shape, structure, and size of the limbs are described. Contrary to what was expected for scratch digging semi-fossorial species, Tympanoctomys have slender humerus, radius and ulna; with narrow epicondyles of the humerus and short olecranon of the ulna with poorly developed processes. Following our descriptions, no intrageneric morphological variation regarding to the configuration of the limbs was detected, probably due to phylogenetic proximity, and not related to specific variations in response to different use of substrates or habits. The obtained results constitute a source of previously unpublished information as well as an important base for future analysis in different studies, such as morphometric, morpho-functi...
Mastozoologia Neotropical, 2013
Proyecto académico sin fines de lucro, desarrollado bajo la iniciativa de acceso abierto
Rev. Asoc. Colomb. Alerg. …, 2003
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Papers by Julieta Armenta Perez