Here we report the first record of Drymoreomys albimaculatus Percequillo, Weksler & Costa, (Cricetidae, Sigmodontinae) in Rio de Janeiro state, Brazil. The recently described taxon Drymoreomys albimaculatus is endemic to the Brazilian Atlantic Forest and its biology and genetics are still poorly known. Herein. PDF | Drymoreomys albimaculatus is a recently-described rodent and an Atlantic Forest endemic. It is rare and has a poorly defined geographic.

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Sigmodontinae from Misiones Province, Argentina. Sample points prior to the plateau phase were discarded as burn-in, and the remaining trees were combined to find the maximum a posteriori probability estimated of the drymoreimys.

Arquivos do Museu Nacional Rio de Janeiro The upper incisors are opisthodont with the cutting surface oriented backwards and have orange to yellow enamel.

Interphotoreceptor retinoid binding protein

The tail is brown above and below. Although several species still remain without karyotypic information e. Blocks of heterochromatin are present on all autosomes and the long arm of Y. This is version 22 of the entry and version 1 of the sequence.

The karyotype herein reported for Drymoreomys albimaculatus is species-specific,since only three other Oryzomyini species present the same diploid number, but different FN: Molecular Biology and Evolution The recently described taxon Drymoreomys albimaculatus is endemic to the Brazilian Atlantic Forest and its biology and genetics are still poorly known. Although its range is relatively large and includes some protected areasit is patchy and threatened, and the discoverers recommend that the animal be considered ” Near Threatened ” on the IUCN Red List.


According to those analyses, Percequillo et al.

Drymoreomys – Wikipedia

Do not show this banner again. The specimens collected were medium sized male body mass: Within Oryzomyini, Drymoreomys appears to be most closely related to Eremoryzomys from the Andes of Albimaculatsu, a biogeographically unusual relationship, in that the two populations are widely separated and each is adapted to an arid or a moist environment.

As Drymoreomys albimaculatus exhibited the highest diploid number reported hitherto and diverged early alhimaculatus clade D, karyotype evolution in this clade based on the phylogeny Fig. The stationary phase was checked following Nylander et al. The crests on the braincase and interorbital region are weakly developed. Molecular Phylogenetics and Evolution 1: Genetics and Molecular Biology.

Drymoreomys albimaculatus – Wikipédia, a enciclopédia livre

Cytogenetic and Genome Research Two simultaneous analyses were performed to ensure convergence on topologies. Introduction The Atlantic Forest harbors a high diversity of mammals, 20 percent of which are rodents of the subfamily Sigmodontinae Ribeiro et al.

The angular processbelow the condyloid, is fairly short and does not extend further backwards than the condyloid.

Additionally, external morphological information is provided. Cytogenetics and Cell Genetics Oryzomyiniwith comments on Oryzomyine dry,oreomys. GTG-banding allowed the identification of almost all autosomic pairs, the X chromosome exhibited two interstitial bands at the long arm while a conspicuous pattern in the Y was not found Fig.


Non-Robertsonian mechanisms such as pericentric inversions, unequal translocations, or whole-arm heterochromatin addition or deletion could also be invoked in those cases of changes in FN but not in 2n e. Journal of Molecular Evolution Here, we describe the karyotype of Drymoreomys albimaculatus for the first time.

Drymoreomya Acids Research According to a phylogenetic analysis of drymoromys from morphologythe nuclear gene IRBPand the mitochondrial gene cytochrome bDrymoreomys albimaculatus is most closely related to Eremoryzomys poliusan oryzomyine from northern Peru and the only species in the genus Eremoryzomys.

Additionally, these sequences have been associated with chromosome rearrangements Ruiz-Herrera et al. A Taxonomic and Geographic Reference.

First cytogenetic information for Drymoreomys albimaculatus Rodentia, Cricetidaea recently described genus from Brazilian Atlantic Forest. John Hopkins University Press, Baltimore: Mitotic drymoreomjs were digitally captured with visible light or blue and green filters emission at and nm, respectively in an Axioskop 40 epifluorescence microscope Carl Zeiss equipped with an Axiocam camera and AxionVision software. Drymoreomys albimaculatus Percequillo, Weksler, and Costa,

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