| new genus and six new species of chiggers (acari: trombiculidae and leeuwenhoekiidae) collected from small mammals in argentina. | argentinacarus. n. gen., is proposed with argentinacarus expansus, n. sp., off irenomys tarsalis and akodon longipilis, as type species. quadraseta akodonica, off akodon longipilis and auliscomys micropus, colicus sinpretarsus, off histiotus montanus, parasecia argentinensis off phyllotis xanthopygus, parasecia neuquenensis, off akodon longipilis, and andalgalomacarus xanthopyga, off phyllois xanthopygus and eligmodontia morgani, are described as new. all specimens were collected in argentina. | 1995 | 7650704 |
| host range and geographical distribution of ixodes sigelos (acari: ixodidae). | larvae, nymphs and females of ixodes sigelos keirans, clifford and corwin (ixodidae) were collected in 13 localities of the patagonian region of argentina parasitizing eight species of sigmodontine rodents. we report for the first time adults of i. sigelos for argentina. besides, we extend the southern limit of its geographical distribution, and six species of sigmodontines are added as new host species of i. sigelos (phyllotis xanthopygus, euneomys chinchilloides, calomys musculinus, reithrodon ... | 2010 | 20340041 |
| morphometric variation of androlaelaps fahrenholzi (mesostigmata: laelapidae) associated with three sigmodontinae (rodentia: cricetidae) from the north of chile. | androlaelaps fahrenholzi is a mite with a large distribution and associated with a wide range of hosts. to assess morphometric variation of a. fahrenholzi associated with different host species (phyllotis xanthopygus and akodon albiventer, both from putre, chile) and localities (las chinchillas national reserve, fray jorge national park, and llanos de challe national park, all in chile and all from the host phyllotis darwini), 41 morphological characters of each specimen were measured, and princ ... | 2020 | 32285240 |
| fleas associated with non-flying small mammal communities from northern and central chile: with new host and locality records. | fleas associated with small mammals from seven localities from northern and central chile were assessed. we captured 352 small mammals belonging to 12 species from which we obtained 675 fleas belonging to 15 different species. the most frequently captured flea species were neotyphloceras crassispina crassispina (n = 198) and n. chilensis (n = 175). high values of flea species richness and diversity were found in fray jorge national park (np), a north-central chilean site, whereas the highest val ... | 2013 | 23496338 |
| description of a new species of ectinorus (e. spiculatus) (siphonaptera, rhopalopsyllidae) from argentina and a review of the subgenus ichyonus smit, 1987. | a new species, ectinorus spiculatus, is described from phyllotis xanthopygus (waterhouse) and akodon iniscatus thomas from neuquén province, argentina. habitat characteristics are presented for the type locality. a change in status of four additional subspecies of the ectinorus subgenus ichyonus smit is provided. ectinorus onychius onychius jordan and rothschild, ectinorus onychius deplexus smit and ectinorus onychius angularis smit & rosický were elevated to specific status. ectinorus (ichyonus ... | 2011 | 21998530 |
| redescription of the male and description of the female of ixodes abrocomae lahille, 1916 (acari: ixodidae). | the male of ixodes abrocomae lahille, 1916 (acari: ixodidae) is redescribed and the female described for the first time from specimens collected on the rodents abrothrix longipilis (waterhouse), a. olivaceous (waterhouse) and phyllotis xanthopygus (waterhouse) at coquimbo, chile. the males of i. abrocomae are peculiar in having the combination of the following features: length and width less than 2 mm and 1 mm, respectively; hypostome notched with two rows of stout denticles and several small in ... | 2010 | 20852985 |
| a new species of trichuris (nematoda: trichuridae) from phyllotini rodents in argentina. | a new species of trichuris is described. trichuris pardinasi n. sp. was recovered from phyllotis xanthopygus waterhouse (rodentia: muridae: phyllotini) in sierra de la ventana, buenos aires province, and pampa de achala, córdoba province (argentina). this is the first record of trichuris parasitizing phyllotini rodents. the new species can be differentiated from the other 10 species parasitizing rodents from south america by the absence of the spicular tube, spicular sheath with spines uniformly ... | 2006 | 16629323 |
| thermal acclimation and seasonal variations of erythrocyte size in the andean mouse phyllotis xanthopygus rupestris. | seasonal hematological adjustments in small mammals may include changes in the number and size of the red cells or changes in other linked blood parameters. the direction and magnitude of these changes vary in different species. we hypothesized that the observed variations of the red cell adjustments could be directly related to the magnitude of the seasonal temperature differential, and predicted that the annual red cell size variation in rodents from environments with marked seasonal changes w ... | 2004 | 15596384 |
| phylogenetic relationships among robertsonian karyomorphs of graomys griseoflavus (rodentia, muridae) by mitochondrial cytochrome b dna sequencing. | graomys griseoflavus (waterhouse 1837) is a phyllotine murid rodent with a robertsonian autosomal polymorphism, having been described 2n = 42, 41, 38, 37, 36, 35 and 34 karyomorphs, and proposed a chromosomal divergence pathway accounted by four sequential robertsonian fusions. sequences of a fragment (422 bp long) of the cytochrome b (cyt b) mitochondrial gene and its 5' flanking region (trna glu) were obtained for 19 graomys griseoflavus from different karyomorphs to infer phylogenetic relatio ... | 2002 | 12369098 |
| habitat islands, genetic diversity, and gene flow in a patagonian rodent. | the effects of terrestrial habitat islands on gene flow and genetic diversity in animal populations have been predicted and discussed in theoretical terms, but empirical data are needed to test these predictions and provide an understanding of the relationships of life-history characteristics to genetics of insular species. we studied saxicolous mice (phyllotis xanthopygus) in patagonia to explore genetic structure, phylogeography, and gene flow in a species inhabiting natural habitat islands. p ... | 1998 | 9640647 |
| geographic variation in quantitative skull traits and systematic of southern populations of the leaf-eared mice of the phyllotis xanthopygus complex (cricetidae, phyllotini) in southern south america. | the leaf-eared mice of the genus phyllotis (cricetidae, phyllotini) encompasses at least 20 species of medium-sized neotropical rodents mostly distributed throughout the andean region. its limits and contents were reviewed by several authors, based both on morphological and molecular data. however, no integrative approaches were conducted based on large samples of individuals with a wide geographical coverage. the purposes of this paper are: (i) to evaluate species limits; and (ii) to test the c ... | 2018 | 30313897 |
| rodents as potential reservoirs for borrelia spp. in northern chile. | small mammals play an essential role in the transmission and maintenance cycles of borrelia spirochetes. in chile, recent studies have characterized novel borrelia genotypes in ticks collected from small mammals, a fact that suggests these vertebrates are hosts for spirochetes from this genus. considering this evidence, the goal of this study was to determine the presence of borrelia dna in small mammals inhabiting northern chile. in winter of 2018, 58 small mammals were captured in five localit ... | 2020 | 32609236 |
| discovery of the world's highest-dwelling mammal. | environmental limits of animal life are invariably revised when the animals themselves are investigated in their natural habitats. here we report results of a scientific mountaineering expedition to survey the high-altitude rodent fauna of volcán llullaillaco in the puna de atacama of northern chile, an effort motivated by video documentation of mice (genus phyllotis) at a record altitude of 6,205 m. among numerous trapping records at altitudes of >5,000 m, we captured a specimen of the yellow-r ... | 2020 | 32675238 |
| developmental environment influences activity levels in a montane rodent, phyllotis xanthopygus. | ambient temperature and thermal variability play a crucial role in diverse aspects of organisms' biology. in the current context of climate change, it is critical to understand how temperature impacts traits that could affect fitness. in phyllotis xanthopygus, a small altricial rodent inhabiting an altitudinal gradient in the andes mountains of argentina, the behavioral response to temperature varies between populations from different altitudes. animals from high altitude (cold environment) redu ... | 2020 | 32745957 |
| genome size variation and its phenotypic consequences in phyllotis rodents. | constitutive heterochromatin and genome size were studied in phyllotis darwini, three phyllotis xanthopygus subspecies, and their interspecific laboratory hybrids. p. darwini, with no or only small c-bands, had the smallest genome size; p. xanthopygus rupestris and p. x. vaccarum, with large c-bands in all the chromosomes, had the largest; and p. x. xanthopygus, with heterochromatin only in a few chromosomes, showed intermediate genome size. to examine some phenotypic consequences of nuclear dna ... | 1991 | 1810909 |
| increase in carbohydrate utilization in high-altitude andean mice. | the low oxygen levels at high altitude are a potent and unavoidable physiological stressor to which highland mammals must adapt. one hypothesized adaptation to high altitude is an increased reliance on carbohydrates to support aerobic activities. based on stoichiometries of combustion, atp yield per mole of oxygen from carbohydrates is approximately 15% higher than from lipids (observed difference closer to 30%), and increased carbohydrate use represents an important oxygen-saving strategy that ... | 2012 | 23219722 |
| litomosoides pardinasi n. sp. (nematoda, onchocercidae) from two species of cricetid rodents in northern patagonia, argentina. | seventy-seven cricetid rodents, corresponding to six different species, deposited at the mammal collection at centro nacional patagónico, puerto madryn, chubut, were examined for parasites. litomosoides pardinasi n. sp. is described parasitizing the pleural and abdominal cavities of phyllotis xanthopygus (phyllotini) and the abdominal cavity of oligoryzomys longicaudatus (oryzomynii) in the northern patagonia, argentina. the new species is included in the carinii group, characterized by the pres ... | 2011 | 20852888 |