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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Drymoreomys albimaculatus – Wikipédia, a enciclopédia livre

For instance, a superficial morphological comparison among sex chromosomes from Table 1 could suggest the occurrence of pericentric inversions, or whole-arm heterochromatin additions or deletions. Article Tools How to cite item. Drymoreomys albimaculatus Percequillo, Weksler, and Costa, Automatic assertion inferred from database entries i.

Molecular Biology and Evolution Both sex chromosomes are submetacentric with one arm noticeably longer than the otherand X is larger than Y. On M1, the anterocone the front cusp is divided into two cuspules on the lingual inner, towards the tongue and labial outer, towards the lips sides of the teeth. Ungual tufts fur around the bases of the claws are present on the second through fourth digits. Introduction The Atlantic Forest harbors a high diversity of mammals, 20 percent of which are rodents of the subfamily Sigmodontinae Ribeiro et al.

Consequently, our knowledge of small mammal biodiversity will be improved as a whole, which will allow improvements in relevant laws and policies for biodiversity protection.

Additionally, external morphological information is provided. Journal of Molecular Evolution Sigmodontinae from southern Brazil. Additionally, these sequences have been associated with chromosome rearrangements Ruiz-Herrera et al.

Nucleotide sequencing was conducted using BigDye Terminator v3. Zoological Journal of Linnean Society Oryzomyiniwith comments on Oryzomyine biogeography.


Fore and hind feet digits were covered by silvery-white hairs and the dorsal surface of hind feet were covered by brown hairs forming a patch, in a more conspicuous pattern than the observed for Rhipidomys. There is only one spine on the papilla nipple-like projection on the upper side of the penis.

Sigmodontinae based on cytochrome b DNA sequences. The upper surface on the forefeet is covered with brown fur, and there is white or silvery fur on the digits. CBG-banding revealed pericentromeric constitutive heterochromatic blocks in all autosomes and in the long arm of Y Fig. 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. 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.

Molecular Phylogenetics and Evolution Views Read Edit View history. InterPro serine-type peptidase activity Source: Drymoreomys is a rodent genus in the tribe Oryzomyini that lives in the Atlantic Forest of Brazil.

Drymoreomys – Wikipedia

Nuclear and mitochondrial DNA sequences from the two karyotyped individuals verify the taxonomic identity as the recently described Drymoreomys albimaculatus and confirm the relationship of albomaculatus species with other Oryzomyini. On the other hand, several anatomical traits that distinguish the Drymoreomys albimaculatus holotype and species of Oecomys wereobserved in our samples, such as the plantar surface of pes covered with squamae; dorsal surface of pes with dark patches of brown hairs and the ventral pelage albimacuoatus gular and thoracic white patches Percequillo et al.

Species of tribe Oryzomyini rice rats. This suggests an evolutionary trend of decreasing chromosome number albimacultus the clade. Dorsal pelage was reddish-brown; ventral pelage was predominantly ddrymoreomys. The crests on the braincase and interorbital region are weakly developed. Reproductive activity has been observed in females in June, November, and December and in males in December, suggesting that the species breeds year-round.


Do not show this banner again. The specimen was captured in a pitfall trap, in a mixed habitat of forest and bamboo. The statistical support for the nodes was estimated by the nonparametric bootstrap, with pseudoreplicates Felsenstein 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.

A Taxonomic and Geographic Reference. EMBL nucleotide sequence database More Published online May It is one of several drumoreomys recognized within the subfamily Sigmodontinaewhich encompasses hundreds of species found across South America and into southern North America.

There are three digits at the tip of the penis, of which the central one is the largest. From Wikipedia, the free encyclopedia. The name refers to the animal’s occurrence in mountain forest. The zygomatic notch a notch formed by a projection at the front of the zygomatic platea bony albumaculatus at the side of the skull is shallow.

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The nasal and premaxillary bones extend in front of the incisorsforming a rostral tubewhich is shared among oryzomyines only with Handleyomys. Both extraction and PCR controls were used for each amplification. The sides are reddish brown.

We thank two anonymous reviewers for their helpful comments.