Topic
Mesomys
About: Mesomys is a research topic. Over the lifetime, 8 publications have been published within this topic receiving 414 citations.
Papers
TL;DR: Genealogical analyses and broader scale phylogeographic patterns of this species show that both clades have relationships to areas well outside the Rio Juruá basin, which suggests that the basin represents a relatively recent point of invasion between two more broadly distributed and differentiated geographic units of the species.
Abstract: Sequence variation in the mitochondrial cytochrome b gene was examined in the arboreal spiny rat, Mesomys hispidus, collected at 15 sites along the Rio Jurua in western Amazonia, Brazil, to determine the importance of riverine barriers in the diversification of this taxon. Twenty individual haplotypes were uncovered, most of which were unique to single localities but some of which were shared among adjacent sites either along or across the river. Genealogical analyses suggest that gene flow is limited and, in combination with the unique distribution of most haplotypes, suggest that populations of this species are strongly substructured along the river. Thus, most sharing of haplotypes between adjacent localities is probably caused by historical association rather than to ongoing gene flow. Two haplotype clades were uncovered, but these correspond to headwaters versus mouth areas, not to opposite sides of the river, as would be expected by the Riverine Barrier Hypothesis. Moreover, haplotype sharing across the river was greater at its mouth than in the headwaters, a pattern opposite that expected if the river were a substantive barrier. Broader scale phylogeographic patterns of this species show that both clades have relationships to areas well outside the Rio Jurua basin. This suggests that the basin represents a relatively recent point of invasion between two more broadly distributed and differentiated geographic units of the species.
209 citations
TL;DR: Phylogenetic affinities of the late Miocene echimyid †Pampamys emmonsae Verzi, Vucetich, and Montalvo, 1995, were analyzed, suggesting the Huayquerian South American Land Mammal Age as a minimum age for the origin of the living genus.
Abstract: Phylogenetic affinities of the late Miocene echimyid †Pampamys emmonsae Verzi, Vucetich, and Montalvo, 1995 (Huayquerian South American Land Mammal Age, central Argentina), were analyzed. In the most-parsimonious tree obtained, subfamilies of Echimyidae were nonmonophyletic (except for Dactylomyinae). Two major clades were recovered. One of them included the living fossorial Eumysopinae and the extinct †Theridomysops. The other clade grouped the terrestrial eumysopines Thrichomys (punare) and Proechimys–Trinomys (spiny rats), and the arboreal eumysopines Mesomys (spiny tree-rats) + Echimyinae–Dactylomyinae. †Pampamys was the sister genus of Thrichomys, suggesting the Huayquerian South American Land Mammal Age (>6.0 million years ago [mya] by biochronology) as a minimum age for the origin of the living genus. Both major echimyid clades recognized here are represented by simplified-molared species in the Huayquerian South American Land Mammal Age. This would be related to the expansion of open envi...
30 citations
TL;DR: Three new species of astigmatid mites parasitic on rodents from Peru are described, i.e. Sclerolistrophorus peruviensis n.sp.
Abstract: Three new species of astigmatid mites parasitic on rodents from Peru are described, i.e. Sclerolistrophorus peruviensis n. sp. and S. longipes n. sp. (Listrophoridae) from Oryzomys spp. (Sigmodontidae) and Echimytricalges whitakeri n. sp. (Lobalgidae) from Echimyidae. Two other species of the genus Echimytricalges, i.e. E. surinamensis Fain and E. mesomys Fain, are recorded for the first time from Peru. The male of Chirodiscoides proechimys (Atopomelidae) is described for the first time, also from Peru. Phoretic deutonymphs of Paralabidophorus peruviensis Fain (Glycyphagidae) are recorded from two new hosts, both from Peru.
2 citations
TL;DR: In this article, the authors studied the karyotype of a female specimen of Mesomys stimulax collected from the Tapirape-Aquiri National Forest, Maraba, Para, Brazil, in the Xingu/Tocantins interfluvium.
Abstract: Mesomys Wagner, 1845 (Rodentia, Echimyidae, Eumysopinae) currently has four recognized species, three of which occur in Brazil: Mesomys hispidus (probably a species complex), M. occultus, and M. stimulax. Mesomys leniceps is found in montane forests of northern Peru. Mesomys stimulax, the focus of the present study, has a distribution that is restricted to the central and eastern Amazonia south of the Amazon River, extending from the left bank of the Tapajos River to the right bank of the Tocantins River, and south to the southeast portion of Para State. The genus presents karyotypes with diploid number 2n = 60 and Fundamental Number (FN) = 116 for M. hispidus and M. stimulax, and 2n = 42, FN = 54 for M. occultus. We studied the karyotype of a female specimen of M. stimulax collected from the Tapirape-Aquiri National Forest, Maraba, Para, Brazil, in the Xingu/Tocantins interfluvium. The obtained karyotype (2n = 60 and FN = 110) differs from that described in the literature for both M. stimulax and M. hispidus by exhibiting more biarmed chromosomes, probably due to pericentric inversions and/or centromeric repositioning, and exhibiting differences in the amount and distribution of constitutive heterochromatin (CH). These results suggest that, similar to what has already been proposed for M. hispidus, M. stimulax may represent a species complex and/or cryptic species. The mechanisms of chromosomal diversification in Mesomys and the biogeographic implications are discussed reinforcing the need for broad systematic review for Mesomys.
2 citations
Journal Article•
1 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2013 | 1 |
| 2012 | 1 |
| 2004 | 1 |
| 2002 | 1 |
| 2001 | 1 |