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chromosomal phylogeny and comparative chromosome painting among neacomys species (rodentia, sigmodontinae) from eastern amazonia.the neacomys genus is predominantly found in the amazon region, and belongs to the most diverse tribe of the sigmodontinae subfamily (rodentia, cricetidae, oryzomyini). the systematics of this genus and questions about its diversity and range have been investigated by morphological, molecular (cytb and coi sequences) and karyotype analysis (classic cytogenetics and chromosome painting), which have revealed candidate species and new distribution areas. here we analyzed four species of neacomys by ...201931601183
karyotypic divergence reveals that diversity in the oecomys paricola complex (rodentia, sigmodontinae) from eastern amazonia is higher than previously thought.the genus oecomys (rodentia, sigmodontinae) is distributed from southern central america to southeastern brazil in south america. it currently comprises 18 species, but multidisciplinary approaches such as karyotypic, morphological and molecular studies have shown that there is a greater diversity within some lineages than others. in particular, it has been proposed that o. paricola constitutes a species complex with three evolutionary units, which have been called the northern, eastern and west ...202033119689
chromosomal signatures corroborate the phylogenetic relationships within akodontini (rodentia, sigmodontinae).comparative chromosome-painting analysis among highly rearranged karyotypes of sigmodontinae rodents (rodentia, cricetidae) detects conserved syntenic blocks, which are proposed as chromosomal signatures and can be used as phylogenetic markers. in the akodontini tribe, the molecular topology (cytb and/or irbp) shows five low-supported clades (divisions: "akodon", "bibimys", "blarinomys", "oxymycterus", and "scapteromys") within two high-supported major clades (clade a: "akodon", "bibimys", and " ...202032244440
[wild rodents (oryzomys goeldi) of amazonia with natural leishmania infection. (1)]. 196414191362
[observations on the behavior of leishmania producing natural infection in oryzomys goeldi in amazonia. (2)]. 196414191363
sigmodontine community and species responses to el niño and precipitation in different levels of forest degradation.few studies have focused on rodent communities at the margins of an ecoregion or the limits of species' distributions, where the community may be more sensitive to extrinsic variables, both biotic and abiotic. this study evaluates sigmodontine rodent species diversity and overall abundance, and variation associated with climatic variables, in three locations with differing levels of habitat degradation. the study was conducted in northeastern paraguay, near the western limit of the upper paraná ...201932905550
habitat, species richness and hantaviruses of sigmodontine rodents within the interior atlantic forest, paraguay.four of the nine sigmodontine tribes have species that serve as reservoirs of rodent-borne hantaviruses (rbo-hv), few have been studied in any depth. several viruses have been associated with human cases of hantavirus pulmonary syndrome often through peridomestic exposure. jabora (jabv) and juquitiba (juqv), harbored by akodon montensis and oligoryzomys nigripes, respectively, are endemic and sympatric in the reserva natural de bosque mbaracayú (rnbm), paraguay, a protected area of the interior ...201830067840
oecomys catherinae (sigmodontinae, cricetidae): evidence for chromosomal speciation?among the oryzomyini (sigmodontinae), oecomys is the most speciose, with 17 species. this genus presents high karyotypic diversity (2n = 54 to 2n = 86) and many taxonomic issues at the species level because of the presence of cryptic species and the overlap of morphological characters. for these reasons the real number of species of oecomys may be underestimated. with the aim of verifying if the taxon oecomys catherinae is composed of more than one species, we made comparative studies on two pop ...201728727788
[ectoparasites of small wild mammals from the adjacent areas of itapecuru river and environmental preservation area of inhamum, state of maranhão, brazil].during fauna studies, thirty-six wild mammals were collected in adjacent areas of itapecuru river and environmental preservation area of inhamum, state of maranhão, brazil. they were sampled for ectoparasites. the following specimens of the order rodentia and its respective ectoparasites were identified: akodon sp. (androlaelaps sp. and laelaps sp.), oecomys sp. (androlaelaps sp. and amblyomma cajennense), oligoryzomys sp. (androlaelaps sp. laelaps sp. and amblyomma sp.) e oryzomys megacephalus ...200820059819
seasonal flooding regime and ecological traits influence genetic structure of two small rodents.although codistributed species are affected by the same abiotic factors, such as rivers and seasonal flooding regimes, ecological traits, such as locomotion habits and habitat preferences, may also influence differences in levels of genetic diversity and differentiation. we examined population genetic structure and diversity of hylaeamys megacephalus and oecomys aff. roberti, two cricetid rodent species from the mid-araguaia river in central brazil, using mitochondrial dna sequence data. specifi ...201425558355
chromosomal diversity and molecular divergence among three undescribed species of neacomys (rodentia, sigmodontinae) separated by amazonian rivers.the neacomys genus (rodentia, sigmodontinae) is distributed in the amazon region, with some species limited to a single endemic area, while others may occur more widely. the number of species within the genus and their geographical boundaries are not known accurately, due to their high genetic diversity and difficulties in taxonomic identification. in this work we collected neacomys specimens from both banks of the tapajós river in eastern amazon, and studied them using chromosome painting with ...201728763510
a new species of polylopadium brennan & jones, 1961 (acari: trombiculidae) from cricetid rodents, peru with description of a new character for the genus and a key to the species.peruensis is described as new from specimens collected from oryzomys yunganus, proechimys quadruplicatus, and oryzomys megacephalus taken in peru. a new character of a nude tactile seta on femur iii is noted for the genus and a key to the species of polylopadium is presented.200211931026
descriptive morphometry and stereology of the tubular compartment in the wild rodent hylaeamys megacephalus (rodentia: cricetidae) from central brazil.information on reproductive characteristics of wild rodents is scarce in the literature. this study aimed to assess the testis morphometry and stereology of hylaeamys megacephalus. we used five animals in the study, captured in forest fragments in southwestern goias state, between april and august 2009. the testes were fixed in karnovsky solution, dehydrated, and embedded in methacrylate. two-micrometer-thick sections from each sample were stained with toluidine blue/sodium borate 1%. images of ...201323473695
novel babesia and hepatozoon agents infecting non-volant small mammals in the brazilian pantanal, with the first record of the tick ornithodoros guaporensis in brazil.taking into account the diversity of small terrestrial mammals of the pantanal, the present study aimed to verify the occurrence of infection by ehrlichia spp., anaplasma spp., rickettsia spp., hepatozoon spp., babesia spp. and parasitism by ticks in non-volant small mammals collected in the brazilian pantanal. samples of blood, liver and spleen were collected from 64 captured animals, 22 marsupials and 42 rodents. pathogen detection was performed by the use of genus-specific polymerase chain re ...201626782931
changuinola virus serogroup, new genomes within the genus orbivirus (family reoviridae) isolated in the brazilian amazon region.we report here the first complete genome sequence of a changuinola virus (cglv) serotype irituia virus (be an 28873) isolated from a wild rodent (oryzomys goeldi) in the municipality of ipixuna, state of pará, northern brazil. all genome segments showed similarity with those belonging to members of the genus orbivirus, family reoviridae.201324285662
comparative chromosome banding analysis of three south american species of rice rats of the genus oryzomys (rodentia, sigmodontinae).comparative g- and c-banding analysis in three species of rice rats, namely oryzomys megacephalus from peru and french guiana, o. yunganus (peru) and o. nitidus (bolivia) was carried out. it revealed that peruvian o. megacephalus (2n = 52, nfa = 62) and that from french guiana (2n = 54, nfa = 64) differ from each other by one rb translocation and one heterochromatic arm addition/deletion. three further rb translocations separate them from o. yunganus (2n = 58, nfa = 62). only 16 out of 39 autoso ...200010919720
[notes on natural infection of oryzomys capito laticeps in an euzootic focus of cutaneous leishmaniasis in the estado de são paulo, brazil]. 19734751054
two new species of schoengastiine chiggers (acari: trombiculidae) from brazil and rediagnosis of arisocerus brennan, 1970.colicus spinosus goff & gettinger, n. sp., is described from marmosa agilis. quadraseta brasiliensis goff & gettinger, n. sp., is described from marmosa agilis, monodelphis americana, and oryzomys capito. all specimens were collected in central brazil. the diagnosis of the genus arisocerus brennan, 1970, is corrected to describe the setation of the palpal tarsus as 7bs rather than 6bs as listed in the original description.19892585450
[further observations on leishmania isolated from "oryzomys goeldi" in amazônia. 4]. 19665295600
hierarchical genetic structure and gene flow in three sympatric species of amazonian rodents.the population genetic structure of three species of amazonian rodents (oligoryzomys microtis, oryzomys capito, and mesomys hispidus) is examined for mtdna sequence haplotypes of the cytochrome b gene by hierarchical analysis of variance and gene flow estimates based on fixation indices (nst) and coalescence methods. species samples are from the same localities along 1000 km of the rio juruá in western amazonian brazil, but each species differs in important life history traits such as population ...19968673269
[studies on wild reservoirs and vectors of "trypanosoma cruzi". 34. natural infection of the rat "oryzomys capito laiuceps" (lund, 1841) by t. cruzi]. 19695800798
heterologous amplification of microsatellite loci from mouse and rat in oryzomyine and thomasomyine south american rodents.eleven heterologous primers were investigated in 119 individuals of 11 species of rodents of the oryzomyine and thomasomyine groups. the animals were collected at four sites of the "cerrado," a dryland biome located on the brazilian plateau, all of them being karyotyped and taxonomically allocated according to the karyotype. four of these primers, r47, r65, r75 (from rattus), and atp (from mus) cross-amplified in at least one of these taxa, giving products of seven, nine, one, and three bands, r ...200011100269
geographic patterns of genetic variation and conservation consequences in three south american rodents.in this study, the geographic patterns of genetic variation of three rodent species belonging to the tribe oryzomyini were investigated using the mitochondrial cytochrome b and nuclear irbp genes in biomes that are undergoing degradation processes to a greater or lesser degree. the samples are from 25 collecting localities distributed throughout the amazon, cerrado, atlantic forest, and pampa biomes. the results show that the three species have a population and geographic structure, besides bein ...200717939030
pneumocystis and histoplasma infections in wild animals from the amazon region of brazil.routine examination of tissues from wild forest rodents from amapá, north brazil, revealed pneumocystis carinii in lung smears from a newly captured oryzomys capito (cricetidae). acute, fatal infections with this parasite are also recorded in a number of captive "coatimundis", nasua narica (carnivora: procyonidae) and a sloth, bradypus tridactylus (edentata). pneumocystis was also encountered in lung smears from a newly captured and apparently healthy sloth, choloepus didactylus. the presence of ...19751084602
extensive chromosomal reorganization in the evolution of new world muroid rodents (cricetidae, sigmodontinae): searching for ancestral phylogenetic traits.sigmodontinae rodents show great diversity and complexity in morphology and ecology. this diversity is accompanied by extensive chromosome variation challenging attempts to reconstruct their ancestral genome. the species hylaeamys megacephalus--hme (oryzomyini, 2n = 54), necromys lasiurus--nla (akodontini, 2n = 34) and akodon sp.--asp (akodontini, 2n = 10) have extreme diploid numbers that make it difficult to understand the rearrangements that are responsible for such differences. in this study ...201626800516
clues on syntenic relationship among some species of oryzomyini and akodontini tribes (rodentia: sigmodontinae).sigmodontinae rodents represent one of the most diverse and complex components of the mammalian fauna of south america. among them most species belongs to oryzomyini and akodontini tribes. the highly specific diversification observed in both tribes is characterized by diploid complements, which vary from 2n = 10 to 86. given this diversity, a consistent hypothesis about the origin and evolution of chromosomes depends on the correct establishment of synteny analyzed in a suitable phylogenetic fra ...201526642204
fish with whole chromosome and telomeric probes demonstrates huge karyotypic reorganization with its between two species of oryzomyini (sigmodontinae, rodentia): hylaeamys megacephalus probes on cerradomys langguthi karyotype.rodentia comprises 42 % of living mammalian species. the taxonomic identification can be difficult, the number of species currently known probably being underestimated, since many species show only slight morphological variations. few studies surveyed the biodiversity of species, especially in the amazon region. cytogenetic studies show great chromosomal variability in rodents, with diploid numbers ranging from 10 to 102, making it difficult to find chromosomal homologies by comparative g bandin ...201323494775
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