| 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 ... | 1996 | 8673269 |
| napoleon bonaparte and the fate of an amazonian rat: new data on the taxonomy of mesomys hispidus (rodentia: echimyidae). | the spiny rat mesomys hispidus is one of many south american rodents that lack adequate taxonomic definition. the few sampled populations of this broadly distributed trans-amazonian arboreal rat have come from widely separated regions and are typically highly divergent. the holotype was described in 1817 by a.-g. desmarest, after napoleon's army brought it to paris following the plunder of lisbon in 1808; however, the locality of origin has remained unknown. here we examine the taxonomic status ... | 2003 | 12679076 |
| trypanosoma (megatrypanum) lainsoni n. sp. from mesomys hispidus (rodentia: echimyidae) in brazil: trypomastigotes described from experimentally infected laboratory mice. | we report the detection, isolation and description of trypanosoma (megatrypanum) lainsoni n. sp. from a caviomorph rodent, mesomys hispidus (rodentia: echimyidae), obtained in the rio negro region of the state of amazonas, in northern brazil. laboratory-bred white mice (mus musculus) and rats (rattus rattus) were inoculated with large numbers of culture forms by intraperitoneal route, and trypomastigotes appeared in their blood 3-8 days post-inoculation. one single epimastigote was also found in ... | 2013 | 24309069 |
| amazonian phylogeography: mtdna sequence variation in arboreal echimyid rodents (caviomorpha). | patterns of evolutionary relationships among haplotype clades of sequences of the mitochondrial cytochrome b dna gene are examined for five genera of arboreal rodents of the caviomorph family echimyidae from the amazon basin. data are available for 798 bp of sequence from a total of 24 separate localities in peru, venezuela, bolivia, and brazil for mesomys, isothrix, makalata, dactylomys, and echimys. sequence divergence, corrected for multiple hits, is extensive, ranging from less than 1% for c ... | 1993 | 8136924 |
| gene genealogy and differentiation among arboreal spiny rats (rodentia: echimyidae) of the amazon basin: a test of the riverine barrier hypothesis. | sequence variation in the mitochondrial cytochrome b gene was examined in the arboreal spiny rat, mesomys hispidus, collected at 15 sites along the rio juruá 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 l ... | 1994 | 28564449 |
| boehmiella wilsoni (nematoda, heligmosomoidea, boehmiellidae fam. nov.), found in amazonian rodents. | the genus boehmiella was initially described as a member of the family trichostrongylidae. subsequently, it was assigned to the subfamily haemonchinae in the family haemonchidae. we analyzed parasites of spiny tree-rats, mesomys hispidus, collected in the amazon rainforest, which were identified as b. wilsoni based on integrative taxonomy. using morphology, morphometry, and scanning electron microscopy (sem), we added new data to the original description of the species. we also inferred phylogen ... | 2020 | 32995268 |