The genus Oecomys (Rodentia, Sigmodontinae) in Argentina

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Intense genomic reorganization in the genus Oecomys (Rodentia, Sigmodontinae): comparison between DNA barcoding and mapping of repetitive elements in three species of the Brazilian Amazon

Oecomys Thomas, 1906 is one of the most diverse and widely distributed genera within the tribe Oryzomyini. At least sixteen species in this genus have been described to date, but it is believed this genus contains undescribed species. Morphological, molecular and cytogenetic study has revealed an uncertain taxonomic status for several Oecomys species, suggesting the presence of a complex of spe...

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Oecomys catherinae (Sigmodontinae, Cricetidae): Evidence for chromosomal speciation?

Among the Oryzomyini (Sigmodontinae), Oecomys is the most speciose, with 17 species. This genus presents high karyotypic diversity (2n = 54 to 2n = 86) and many taxonomic issues at the species level because of the presence of cryptic species and the overlap of morphological characters. For these reasons the real number of species of Oecomys may be underestimated. With the aim of verifying if th...

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Systematics of Argentinean, Paraguayan, and Uruguayan Swamp Rats of the Genus Scapteromys (rodentia, Cricetidae, Sigmodontinae)

We present a systematic study of Scapteromys populations from Argentina, Paraguay, and Uruguay, based on molecular and morphological evidence. First, based on DNA sequences (801 base pairs) from the mitochondrial cytochrome-b gene, we found that Scapteromys populations fall into 2 main clades; 1 formed by Argentinean and Paraguayan populations together with 1 population from western Uruguay, an...

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Genetic diversity and relatedness within and between species of the genus Oligoryzomys (Rodentia; Sigmodontinae).

A RAPD analysis on six species of the rodent genus Oligoryzomys trapped in a wide area (ranging from 01 degrees N to 32 degrees S) of Brazilian territory was performed in order to determine the levels of genetic variability within and between its populations and species. One-hundred and ninety-three animals were collected in 13 different sites (corresponding to 17 samples) located at Pampas, At...

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Molecular phylogeny of the genus Oryzomys (Rodentia: Sigmodontinae) based on cytochrome b DNA sequences.

The genus Oryzomys comprises 40 species arranged in several species groups. To test the monophyly of three Oryzomys species groups ("capito," nitidus, and subflavus), we analyzed, by distance, parsimony, and maximum-likelihood (ML), 801 bp of the mitochondrial gene cytochrome b. Our results did not sustain the monophyly of Oryzomys nor of the nitidus and subflavus species groups. Within the "ca...

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ژورنال

عنوان ژورنال: Mammalia

سال: 2005

ISSN: 0025-1461,1864-1547

DOI: 10.1515/mamm.2005.011