Pablo Ortiz | Universidad Nacional de Tucumán (original) (raw)

Papers by Pablo Ortiz

We describe an extinct murid, assigned to the tribe Phyllotini, from the late Pleistocene (Taff d... more We describe an extinct murid, assigned to the tribe Phyllotini, from the late Pleistocene (Taff del Valle Formation) of La Angostura (26055'30"S, 65'41'50"W; 1,900 m elevation) in northwestern Tucumin Province, Argentina. The new genus is characterized by very hypsodont molars with flat crowns and simplified occlusal structure, upper incisors with a mediolateral groove, a straight premaxillary-maxillary suture, and high zygomatic plate with a small spine on its anterodorsal edge. Phylogenetic analyses including fossil and living members of the Reithrodon group show that the new genus is the sister taxon to the Reithrodon-Neotomys-Euneomys clade. The paleoenvironmental and paleogeographic significance of the new genus is discussed within the context of the climatic changes that occurred during the late Pleistocene in southern South America. The new phyllotine would have lived in high-elevation grasslands, which today occur >1,000 m higher under cold and dry climatic conditions than those of the last glacial maximum.

Fil: D'hiriart, Sofia. Consejo Nacional de Investigaciones Cientificas y Tecnicas; Argentina.... more Fil: D'hiriart, Sofia. Consejo Nacional de Investigaciones Cientificas y Tecnicas; Argentina. Universidad Nacional de Chilecito; Argentina. Universidad Nacional de Tucuman. Instituto de Ecologia Regional. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Tucuman. Instituto de Ecologia Regional.; Argentina

Fil: Gonzalez, Francisco Rodrigo. Universidad Nacional de Tucuman. Facultad de Ciencias Naturales... more Fil: Gonzalez, Francisco Rodrigo. Universidad Nacional de Tucuman. Facultad de Ciencias Naturales e Instituto Miguel Lillo; Argentina

Therya notes

En 2021, Jayat et al. propusimos una nueva especie de roedor sigmodontino, nombrada Phyllotis peh... more En 2021, Jayat et al. propusimos una nueva especie de roedor sigmodontino, nombrada Phyllotis pehuenche, para las poblaciones del complejo de especies de Phyllotis xanthopygus del sudoeste de la provincia de Mendoza y el oeste de la provincia de Neuquén, Argentina. La descripción formal de la especie, publicada en un material suplementario electrónico modificable, no cumple con los requerimientos establecidos en la enmienda sobre publicaciones electrónicas (ICZN 2012) de la Cuarta Edición del Código Internacional de Nomenclatura Zoológica (ICZN 1999), haciendo que el nombre no esté disponible. El objetivo de esta nota es cumplir con los requerimientos del código y hacer el nombre disponible. Aquí ofrecemos una versión resumida de la descripción original de esta especie. En esta nota, ofrecemos un tratamiento taxonómico para P. pehuenche, incluyendo su sinonimia, localidad tipo, holotipo y paratipos, proveyendo la etimología del epíteto específico, y ofreciendo una diagnosis para...

Notas sobre Mamíferos Sudamericanos

Magnolia Press, Dec 1, 2008

Morphological and molecular studies allowed us to recognize a new species of Oxymycterus from the... more Morphological and molecular studies allowed us to recognize a new species of Oxymycterus from the southern end of the Yungas of Argentina. External morphologic traits allow the new species, Oxymycterus wayku, to be differentiated from O. paramensis and O. akodontius, the two currently recognized species for northwestern Argentina, as well as from the remaining species of the genus. Those traits include very dark general coloration, ears covered with nearly black hairs, a white spot on the chin, and claws on fore and hind feet long and robust. Cranial characteristics of the new species include wide and relatively shallow zygomatic notches, proportionally short incisive foramina and molar series, and a relatively robust braincase compared to O. paramensis. Phylogenetic analysis based on cytochrome b DNA sequences corroborates the distinctiveness of Oxymycterus wayku n. sp. Observed divergence values support this distinction. This new species is particularly important from a conservation viewpoint due to its rarity and the advanced level of alteration of its habitat.Fil: Jayat, Pablo J.. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Laboratorio de Investigaciones Ecológicas de las Yungas; ArgentinaFil: D Elia, Guillermo. Universidad de Concepción; ChileFil: Padriñas, Ulyses F. J.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Diversidad y Evolución Austral; ArgentinaFil: Miotti, Maria Daniela. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Laboratorio de Investigaciones Ecológicas de las Yungas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; ArgentinaFil: Ortiz, Pablo. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo; Argentin

Fundación Miguel Lillo, Jun 1, 2019

Mammalia, 2022

Based on previously published molecular (mitochondrial) and herein provided morphological (qualit... more Based on previously published molecular (mitochondrial) and herein provided morphological (qualitative and quantitative data) evidence, we describe a new species of leaf-eared mouse of the genus Phyllotis. The new species is morphometrically distinct when compared with other phylogenetically or geographically close species of Phyllotis, showing several quantitative differences in their external and craniodental characters (e.g., proportionally broader nasals and interorbital region, and proportionally smaller tympanic bullae). The new species is endemic to central Argentina, occurring on rocky grasslands at elevations of 650–2,800 m a.s.l. This is the only species of Phyllotis inhabiting the Central Sierras, a mountain system of medium elevation, isolated from the Andes by low elevation arid and semiarid environments.

Therya, 2022

Based on qualitative and quantitative morphological evidence, we describe a new species of Microc... more Based on qualitative and quantitative morphological evidence, we describe a new species of Microcavia (Rodentia, Caviidae). The new species is characterized by a unique combination of morphological traits, that distinguished it from all others within the genus (i. e., upper incisors moderately proodont; palatal crest low, narrow anteriorly and expanded posteriorly; paraorbital process of the jugal small; sphenopalatine vacuities small, with their anterior border located behind the anterior half of the mesopterygoid fossa). The new species seems to be endemic from northwestern Argentina, where it occurs in open shrublands and grasslands >3,100 masl. With the description of this taxon, there are already four species of Microcavia that are distributed in the central Andes.

Ameghiniana, 2021

Abstract. The presence of fossil camelids in Tucumán, northwestern Argentina, has been recognized... more Abstract. The presence of fossil camelids in Tucumán, northwestern Argentina, has been recognized for many years but its relevance has not been fully evaluated so far. Here, we review previous mentions of fossil camelids for this province, present new material, and compare it with fossil and extant specimens of South American camelids, clarifying its taxonomic context and discussing its paleobiogeographic significance. For Tucumán we recognize Vicugna vicugna (Tafí del Valle Formation, late Pleistocene–early Holocene) and Palaeolama sp. (Tucumán Formation, late Pleistocene), mainly based on size and dental features. The current distribution of V. vicugna is restricted to the Central Andes, in the Puna and High Andean environments over 3200 m altitude; there is no mention, neither current nor historical, for Tucumán. Its presence at around 2200 m in the Tafí valley during the Quaternary indicates cooler and drier conditions than those currently established. The observations made in t...

Zoologica Scripta, 2021

Phyllotis Waterhouse 1837 is one of the most studied genera of South American cricetid rodents. A... more Phyllotis Waterhouse 1837 is one of the most studied genera of South American cricetid rodents. As currently understood, it includes 20 small to medium‐sized species of predominantly rocky habitats. Among them, populations of the yellow‐rumped leaf‐eared mouse, traditionally referred to P. xanthopygus (Waterhouse 1837), are the most widely distributed, extending from central Peru to southern Chile and Argentina. Based mostly on molecular evidence, previous studies suggested that P. xanthopygus constitutes a species complex, being characterized by geographically structured and genetically divergent clades. In this work, we compare the molecular phylogenetic hypothesis for populations distributed on the eastern slopes of the central Andes with morphometric evidence using univariate and multivariate analyses. Quantitative morphological and molecular evidence suggests that at least four nearly cryptic species of the P. xanthopygus complex occur from southern Bolivia to west‐central Argentina. Three of these taxa have available names; one of them, P. caprinus, is currently recognized to the species level; the other two, the clades of P. x. posticalis‐P. x. rupestris and P. vaccarum, are both recognized as subspecies of P. xanthopygus. The remaining taxon represents a new species distributed in the west‐central Andes of Argentina. We discuss our morphological results in the light of other sources of evidence (e.g. qualitative and quantitative state characters, genetic and phylogenetic studies, and cytogenetic data) and name the new species as P. pehuenche, honouring the original native people that historically inhabited west‐central Andes of Argentina.

PeerJ, 2020

The taxonomic history ofEuryoryzomys legatushas been complex and controversial, being either incl... more The taxonomic history ofEuryoryzomys legatushas been complex and controversial, being either included in the synonymy of other oryzomyine species or considered as a valid species, as in the most recent review of the genus. Previous phylogenetic analyses segregatedE. legatusfromE. russatus, its putative senior synonym, but recovered it nested withinE. nitidus. A general lack of authoritative evaluation of morphological attributes, details of the chromosome complement, or other data types has hampered the ability to choose among alternative taxonomic hypotheses, and thus reach a general consensus for the status of the taxon. Herein we revisit the status ofE. legatususing an integrated approach that includes: (1) a morphological review, especially centered on specimens from northwestern Argentina not examined previously, (2) comparative cytogenetics, and (3) phylogenetic reconstruction, using mitochondrial genes.Euryoryzomys legatusis morphologically and phylogenetically distinct from ...

Mammalia, 2019

The genus Galea Meyen, 1833 includes at least five species of terrestrial, diurnal and herbivorou... more The genus Galea Meyen, 1833 includes at least five species of terrestrial, diurnal and herbivorous cavies that occupy grasslands and rocky scrub areas at both high and low elevations in South America. According to the available molecular and morphological data, Galea comes Thomas, 1919 is restricted to highland areas above 2000 m in southern Bolivia and northwestern Argentina. Its distributional range as well as its morphological distinctiveness from other closely related species (Galea leucoblephara and Galea musteloides) is poorly documented. Using both qualitative and quantitative morphological traits, we provided an emended diagnosis for G. comes. In addition, we added six new locality records to its known distribution.

Check List, 2011

Sigmodontine rodents are well represented in northwestern Argentina, but information regarding th... more Sigmodontine rodents are well represented in northwestern Argentina, but information regarding their distribution in La Rioja is scarce. We add new information for seven species from seven localities in the Famatina range. These new records were obtained using both captures and owl pellet analysis. We cite the first record of Neotomys ebriosus in La Rioja. The collection locality is unusual for this species because of its low altitude and xeric conditions. Other notable results include the second record of Abrothrix andinus and of the genus Oligoryzomys at the province.

Ornitología Neotropical, 2006

... Marcela J. Nabte1, Sergio L. Saba1,2, &amp; Ulyses FJ Pardiñas1 ... Frecuencias igual... more ... Marcela J. Nabte1, Sergio L. Saba1,2, &amp; Ulyses FJ Pardiñas1 ... Frecuencias igualmente ele-vadas para lagomorfos (&gt; 15%), han sido des-tacadas, estacionalmente, para el sur de Chile (Iriarte et al. 1990) y para Chile Central (Jaksic &amp; Yañez 1980). ...

Journal of Arid Environments, 2012

... Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán, Casilla de Correo 34, 41... more ... Naturales e Instituto Miguel Lillo, Universidad Nacional de Tucumán, Casilla de Correo 34, 4107 Yerba Buena, Tucumán, Argentina. ... The assemblage composition is consistent with the species found in the area today, being the dominant Phyllotis xanthopygus, Eligmodontia spp ...