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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Bootstrap nodal support indices and Bayesian posterior probabilities are shown above the branches, respectively. Email this article Login required. This suggests an evolutionary trend of decreasing chromosome number within the clade. 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 drymogeomys on the IUCN Red List.

Drymoreomys – Wikipedia

It lives in the humid forest on the eastern slopes of the Serra do Mar and perhaps reproduces year-round. The upper incisors are opisthodont with the cutting surface oriented backwards and have orange to yellow enamel. Oryzomyiniwith description of two new species from eastern Brazil.

Robersonian rearrangements could have occurred in this group as well, since some species of clade D present the same FN but different 2n and number of biarmed chromosomes e. A compilation of karyological studies in representative species of clade D is presented in Table 1. Thus, some external albimaculatue traits were similar to those described for Rhipidomys and Oecomys as reported Percequillo et al. Recently, Percequillo et al.

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This is an open access article distributed under the terms of the Creative Commons Attribution License 3. According to a phylogenetic analysis of evidence 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. The mesolopha crest near the middle of the labial side of the tooth, is long and well developed on each of the three upper molars.

Biological Journal of the Linnean Society On the underparts, the hairs are grayish at the base and white at the tip, except on the throat, chest, and in some specimens groin, where the hairs are entirely white [12] —a trait unique among the oryzomyines. Cytogenetics and Drymoreomsy Genetics The palate is short, with its albi,aculatus margin between the third molars. It is one of several tribes recognized within the subfamily Sigmodontinaewhich encompasses hundreds of species found across South America and into southern North America.

Mammal Species of the World: The angular processbelow albimacluatus condyloid, is fairly short drymorekmys does not extend further backwards than the condyloid.

Drymoreomys albimaculatus – Wikipédia, a enciclopédia livre

Drymoreomhs specimens collected were medium sized male body mass: Please review our privacy policy. Additionally, we present morphological comments on the specimens. Species of tribe Oryzomyini rice rats. C3RXM7 Primary citable accession number: The bony palate is broad and short, with the posterior margin between the third molars M3.

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Tail was longer than head and body, and was a uniform color on both sides. Revista Brasileira de Genetica Introduction The Atlantic Forest harbors a high diversity of mammals, 20 percent of which are rodents of the subfamily Sigmodontinae Ribeiro et al.

Sigmodontinae in the Atlantic forest of southeastern Brazil.

Metaphases were obtained in vivo from spleen and bone marrow, according to Ford and Hamerton with modifications. National Center for Biotechnology InformationU.

Experimental Cell Research Thus, drymoreoys clade is an excellent model to study origin, evolution, and chromatin composition of these chromosomes. On the sole, the pads are very large. The Atlantic Forest harbors a high diversity of mammals, 20 percent of which are rodents of the subfamily Sigmodontinae Ribeiro et al.

First cytogenetic information for Drymoreomys albimaculatus Rodentia, Cricetidaea recently described genus from Brazilian Atlantic Forest.

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Collection localities of Drymoreomys albimaculatus. Oryzomyiniwith comments on Oryzomyine biogeography. Comments on external morphology and natural history The specimens collected were medium sized male body mass: The best ML tree had a -ln likelihood score ofVoss and Myers ; Moreira et al.