| ixodes (haemixodes) longiscutatum boero (new status) and i. (h.) uruguayensis kohls & clifford, a new synonym of i. (h.) longiscutatum (acari: ixodidae). | females of ixodes (haemixodes) uruguayensis kohls & clifford, 1967, a species whose adults were unknown until the present, were obtained in the laboratory from engorged nymphs collected on rodents (scapteromys tumidus and oxymycterus nasutus) in the counties of maldonado and san josé, uruguay. morphological characters of these females were identical to those given in the description of the female of ixodes longiscutatum boero, 1944. i. uruguayensis is, thus, relegated to a junior subjective syno ... | 2001 | 11784932 |
| amblyomma triste koch, 1844 (acari: ixodidae): hosts and seasonality of the vector of rickettsia parkeri in uruguay. | amblyomma triste koch, 1844, the tick species most frequently involved in human bites in uruguay, has been implicated as a vector of human rickettsiosis. seasonal abundance of adult a. triste was examined by standard flagging at three sites where human tick bites and cases of the disease have been reported. adult tick activity occurred from august to february (end of winter to mid summer in the southern hemisphere) with a peak in spring. activity declined in step with decreasing temperatures and ... | 2008 | 18565680 |
| juquitiba-like hantavirus from 2 nonrelated rodent species, uruguay. | serologic and genetic analyses indicate that a juquitiba-like hantavirus circulates in maldonado, uruguay. this virus is carried by 2 rodent species, oligoryzomys nigripes and oxymycterus nasutus. the same hantavirus in 2 nonrelated species can be explained by a spillover infection or a host-switching event. | 2008 | 18760017 |
| a new species of litomosoides chandler, 1931 (nematoda: filarioidea) from the long-nosed hocicudo oxymycterus nasutus waterhouse (rodentia: cricetidae) in uruguay. | a new species of litomosoides chandler, 1931 was collected from the abdominal cavity of oxymycterus nasutus waterhouse (rodentia: cricetidae) in the grassland of the departamento rocha, uruguay. litomosoides nasuti n. sp. belongs to the 'sigmodontis group', and is characterised by: salient amphids; two ventral and one dorsal labial papillae, but no cephalic papillae; a buccal capsule with a transparent anterior segment and an annular asymmetrical thickening; a muscular oesophagus; a bottle-shape ... | 2009 | 19424788 |
| temporal niche overlap among insectivorous small mammals. | being active in the same environment at different times exposes animals to the effects of very different environmental factors, both biotic and abiotic. in the present study, we used live traps equipped with timing devices to evaluate the potential role of biotic factors (competition and food abundance) on overall overlap in the temporal niche axis of 4 insectivorous small mammals in high-elevation grassland fields ('campos de altitude') of southern brazil. based on resources availability (inver ... | 2011 | 22182329 |
| pleistocene climatic oscillations in neotropical open areas: refuge isolation in the rodent oxymycterus nasutus endemic to grasslands. | pleistocene climatic oscillations favoured the expansion of grassland ecosystems and open vegetation landscapes throughout the neotropics, and influenced the evolutionary history of species adapted to such environments. in this study, we sampled populations of the rodent oxymycterus nasutus endemic to open areas in the pampas and atlantic forest biomes to assess the tempo and mode of population divergence using an integrative approach, including coalescence theory, ecological niche models, and m ... | 2017 | 29176839 |
| the tubular compartment and the spermatogenic dynamics of the wild rodent oxymycterus nasutus (rodentia: cricetidae). | despite the order rodentia present worldwide distribution and large number of species in the brazilian fauna, detailed studies on testicular morphophysiology are still scarce. therefore, this study aimed to analyze the dynamics of the spermatogenic process of oxymycterus nasutus using morphometrical and stereological tools. testicles from ten sexually mature males were used, showing a gonadosomatic index of 0.89%. the testicular parenchyma showed one of the highest tubulesomatic indexes reported ... | 2014 | 25037444 |