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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On the lower molars m1 to m3the cusps on the labial side are located slightly in front of their lingual counterparts.
From Wikipedia, the free encyclopedia. Mitotic plates 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. It lives in the humid forest on drymkreomys eastern slopes of the Serra do Mar and perhaps reproduces year-round.
The Atlantic Forest harbors a high diversity of mammals, 20 percent of which are rodents of the subfamily Sigmodontinae Ribeiro et al. The single species, D. On the underparts, the hairs are grayish at the base and white at the tip, except on the throat, dryoreomys, and in some specimens groin, where the hairs are entirely white  —a trait unique among the oryzomyines. National Institutes of Health. You are using a version of browser that may not display all the features of this website.
The lack of lateral bacular mounds, presence of a lateral lobule, and size of the preputial glands are all unique traits among the oryzomyines. The coronoid processthe frontmost of the three main processes projections at the back of the jawbone, is large and about as high as the condyloid process behind it. The small, rounded ears are covered with dense golden hairs on the outer and with reddish brown hairs on the inner surface.
Oryzomyiniwith comments on Oryzomyine biogeography. These reiterate the importance of further fieldwork effort, with different collecting methods in order to increase the spectrum of small mammals collected. The upper surface on the forefeet is covered with brown fur, and there is white or silvery fur on the digits.
The alibmaculatus palate is broad and short, with the posterior drymoeomys between the third molars M3. Blocks of heterochromatin are present on all autosomes and the long arm of Y.
Zoological Journal of the Linnean Society FISH detected telomeric signals at the ends of all chromosomes and additional telomeric sequences drumoreomys found in the pericentromeric region of both X and Y chromosomes Fig. The specimens collected were medium sized male body mass: Retrieved from ” https: In other projects Wikimedia Commons Wikispecies. The Bayesian analysis recovered a consensus topology similar to the best ML tree and the results recovered the four well-supported clades A, B, C, and D Fig.
The palate is short, with its back margin between the third molars. Reproductive activity has been observed in females in June, November, and December and in males in December, suggesting that the species breeds year-round. This suggests drymordomys evolutionary trend of decreasing chromosome number within the clade.
Articles from ZooKeys are provided here courtesy of Pensoft Publishers. Metaphases were obtained in vivo from spleen and bone marrow, according to Ford and Hamerton with modifications. In the skull, the rostrum front part is relatively long.
The preputial glands glands in front of the genitals are large. Received Feb a,bimaculatus Accepted May Database of comparative protein structure models More Robersonian rearrangements could have occurred in this group as well, since some species of clade D present drympreomys same FN but different 2n and number of biarmed chromosomes e.
Here, we describe the karyotype of Drymoreomys albimaculatus for the first time. Cricetidae in Minas Gerais, Brazil. This page was last edited on 2 Octoberat Voss and Myers ; Moreira et al. albimaclatus
Cricetidaean Atlantic Forest endemic with the description of a new species. Sigmodontinae based on albimaculatud b DNA sequences. Email this article Login required.
The range of Drymoreomys albimaculatus is relatively large and the species occurs in several protected areasbut it has only been found in seven localities and its habitat is threatened by deforestation and fragmentation. Biological Journal of the Linnean Society The diploid number of Drymoreomys albimaculatus corroborates the pattern found for the majority of the Oryzomyini species, in which karyotypes albimaculaatus relatively high chromosome number and predominantly acrocentric pairs.
Bayesian analysis was performed using MrBayes 3. Sigmodontinae and description of two new species from southeastern Brazil. Telomeric sequences are found near the centromeres of the sex chromosomes.
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