| parasitological and ecological aspects of schistosomiasis mansoni in the valley of the paraíba do sul river (são paulo state, brazil) i. natural infection of small mammals with schistosoma mansoni. | small mammals naturally infected with schistosoma mansoni were studied in the valley of the paraíba do sul river (são paulo state, brazil). 192 animals of 12 species were examined post mortem. cavia aperea, holochilus brasiliensis leucogaster, nectomys squamipes squamipes, oryzomys nigripes eliurus and zygodontomys brachyurus were found infected. most schistosome eggs found in the faeces were mature but no eggs were found in the faeces of c. aperea although adults were recovered. in the other in ... | 1978 | 725994 |
| holochilus brasiliensis and nectomys squamipes (rodentia-cricetidae) natural hosts of schistosoma mansoni. | after several brazilian researchers, the author examines the capacity of two species of rodents cricetidae, holochilus brasiliensis and nectomys squamipes, to maintain the biological cycle of schistosoma mansoni in the field and to be parasite reservoir: (a) the role they are able to play in human endemy; (b) the methods necessary to characterize the population of schistosoma mansoni related either to man, either to rodents, either to both. | 1992 | 1343905 |
| geographic patterns of chromosomal variation in south american marsh rats, holochilus brasiliensis and h. vulpinus. | karyotypes were prepared from 146 individuals, representing nine populations evenly spaced along a 2,000-km north-south transect in paraguay and argentina, to determine the nature, extent, and pattern of chromosomal variation in holochilus brasiliensis chacarius and h. vulpinus. two distinct patterns of chromosomal variation characterized these two species. in h. brasiliensis, the diploid number (2n) ranged from 48 to 56 and the nombre fondamental (nf) from 57 to 63. four classes of chromosomal ... | 1992 | 1505226 |
| occurrence and treatment of the mange mite notoedres muris in marsh rats from south america. | the mange mite notoedres muris is reported from a new host, the marsh rat (holochilus brasiliensis) from argentina. the infection involved alopecia and encrustations on the ears and face, and was treated successfully by a subcutaneous injection of ivermectin. the new record suggests that notoedres muris has become self-maintaining within this marsh rat population. | 1990 | 2406468 |
| exceptional chromosomal mutations in a rodent population are not strongly underdominant. | the observation of karyotypic uniformity in most species has led to the widespread belief that selection limits chromosomal change. we report an unprecedented amount of chromosomal variation in a natural population of the south american marsh rat holochilus brasiliensis. this variation consists of four distinct classes of chromosomal rearrangements: whole-arm translocations, pericentric inversions, variation in the amount of euchromatin, and variation in number and kind of supernumerary (b) chro ... | 1989 | 2771951 |
| [variations in peripheral blood cells levels found in holochilus brasiliensis nanus thomas, 1897, infected with trypanosoma cruzi sambon, 1907, from pre-amazonia]. | | 1985 | 3939165 |
| [blood glucose levels of holochilus brasiliensis nanus thomas, 1897, natural host of schistosoma mansoni in lower amazonia]. | | 1985 | 3939167 |
| [natural infection of holochilus brasiliensis nanus thomas, 1897 (rodentia, cricetidae) by litomosoides carinii]. | it is recorded the natural infection of holochilus brasiliensis nanus, a small semi-aquatic rodent of the occidental lowland of maranhão state, brazil, by litomosoides carinii. | 1985 | 4088043 |
| [holochilus brasiliensis nanus thomas, 1897. suggestion for an experimental model for filariasis, leishmaniasis and schistosomiasis]. | | 1984 | 6535233 |
| [changes in component c3 levels in holochilus brasiliensis nanus experimentally infected with schistosoma mansoni]. | | 1984 | 6729384 |
| morphological aspects of schistosoma mansoni in naturally infected holochilus brasiliensis leucogaster. | | 1980 | 7210119 |
| histopathological observations in new and classic models of experimental schistosoma haematobium infections. | the authors present marsh rat holochilus brasiliensis, jirds meriones shawi and m. unguiculatus as new models of schistosoma haematobium infection. histological findings were compared with those of classic models mouse mus and hamster mesocricetus. in new models, embryonated eggs were seen in the stool from 90 days post infestation (dpi) and active disease developed from 117 to 175 dpi. seven out of 10 rodents presented granulomatous and/or chronic cystitis, fibrosis, polyps and urothelial chang ... | 1996 | 8673838 |
| tapironema coronatum n. gen., n. sp. (trichostrongyloidea-cooperiidae-obeliscoidinae), a parasite of holochilus brasiliensis and tapirus terrestris. | in this paper we provide a description of tapironema coronatum n. gen. n. sp. (trichostrongyloidea, obeliscoidinae) from the cricetid holochilus brasiliensis or "water rat" in argentina (type material) and from tapirus terrestris in french guyana (voucher material in poor condition). the new genus is characterized by a corona radiata, an oesophageal tooth, a bilaterally synlophe with about 73 (male), 122 (female) cuticular ridges, a caudal bursa pattern 2-1-2 with rays 5 and 6 parallel and close ... | 1997 | 9587607 |
| deleterious mutations at the mitochondrial nd3 gene in south american marsh rats (holochilus). | statistical analyses of dna sequences have revealed patterns of nonneutral evolution in mitochondrial dna of mice, humans, and drosophila. here we report patterns of mitochondrial sequence evolution in south american marsh rats (genus holochilus). we sequenced the complete mitochondrial nd3 gene in 82 holochilus brasiliensis and 21 h. vulpinus to test the neutral prediction that the ratio of nonsynonymous to synonymous nucleotide changes is the same within and between species. within h. brasilie ... | 1998 | 9725852 |
| interrelationship between ectoparasites and wild rodents from northeastern buenos aires province, argentina. | infestation parameters and indices of mites, ticks and fleas associated with wild rodents from northeastern buenos aires province, argentina, were studied. host species similarity was also analyzed in relation to their ectoparasites. fifty-five rodents were captured from january 2000 to march 2001. in total, 1,022 ectoparasites were collected and three ectoparasite-host associations were new records. however, this is the first study on craneopsylla minerva wolffhuegeli infesting parameters. ecto ... | 2003 | 12700861 |
| b chromosomes in brazilian rodents. | b chromosomes are now known in eight brazilian rodent species: akodon montensis, holochilus brasiliensis, nectomys rattus, n. squamipes, oligoryzomys flavescens, oryzomys angouya, proechimys sp. 2 and trinomys iheringi. typically these chromosomes are heterogeneous relative to size, morphology, banding patterns, presence/absence of nors, and presence/absence of interstitial telomeric signals after fish. in most cases, bs are heterochromatic and late replicating. active nors were detected in two ... | 2004 | 15292600 |
| graphidioides subterraneus n. sp. (nematoda: trichostrongyloidea) from the south american subterranean rodent ctenomys talarum thomas, 1898 (rodentia: octodontidae). | a new nematode species, graphidioides subterraneus n. sp., found in the stomach of c. talarum from argentina is described. the new species more closely resembles g. mazzai lent & freitas, 1935, parasite of galea leucoblephara from argentina, and g. kravetzi sutton & durette-desset, 1995, parasite of holochilus brasiliensis from uruguay. it can be distinguished by shorter spicules, by the shape of the gubernaculum, by shorter uterine branches, and by a different number of ridges of the synlophe a ... | 2005 | 15991827 |
| habitat associations of small mammals in southern brazil and use of regurgitated pellets of birds of prey for inventorying a local fauna. | we inventoried terrestrial small mammals in an agricultural area in southern brazil by using trapping and prey consumed by barn owls (tyto alba) and white-tailed kites (elanus leucurus). small mammals were trapped in three habitat types: corn fields, uncultivated fields ("capoeiras"), and native forest fragments. a total of 1,975 small mammal specimens were trapped, another 2,062 identified from the diet of barn owls, and 2,066 from the diet of white-tailed kites. both trapping and prey in the p ... | 2007 | 18278312 |
| fur mites of the family listrophoridae (acariformes: sarcoptoidea) associated with south american sigmodontine rodents (cricetidae: sigmodontinae). | six species of 3 genera belonging to the fur mite family listrophoridae were recorded on skins of south american rodents of the cricetid subfamily sigmodontinae housed in the bavarian state collection of zoology (munich, germany). among them, amlistrophorus geoxus sp. nov. from geoxus valdivianus from chile is described as a new for science, and males of prolistrophorus amazonicus amazonicus fain, 1971 are recorded for the first time. the full generic status for the subgenus amlistrophorus of th ... | 2012 | 23129199 |
| on the origin and evolution of the extant system of b chromosomes in oryzomyini radiation (rodentia, sigmodontinae). | heterogeneous supernumerary chromosomes (bs) are recognized in the oryzomyines holochilus brasiliensis, nectomys rattus, n. squamipes, oligoryzomys flavescens and sooretamys angouya, representing about 10% of all known b-containing rodent species. they provide an outstanding model for understanding the origin, evolution and diversity of bs in a phylogenetic context. therefore, whole chromosome-specific probes were generated from flow-sorted holochilus brasiliensis (hbr) autosomes 11 and 25+26 an ... | 2015 | 26305702 |
| study of types of some species of "filaria" (nematoda) parasites of small mammals described by von linstow and molin. | parasitic nematodes from the berlin (zmb) and vienna (nmw) museum collections referred to the genus filaria mueller, 1787 by von linstow or molin were studied. three samples were in good condition and the specimens redescribed. litomosa hepatica (von linstow, 1897) n. comb., sample zmb vermes entozoa 3368, from the megachiropteran pteropus neohibernicus, bismarck archipelago, resembles l. maki tibayrenc, bain & ramanchandran, 1979, from pteropus vampyrus, in malaysia, but the buccal capsule diff ... | 2011 | 21678791 |
| a remarkable autosomal heteromorphism in pseudoryzomys simplex 2n = 56; fn = 54-55 (rodentia, sigmodontinae). | pseudoryzomys simplex, the false rice rat, is a monotypic genus of the oryzomyini tribe (sigmodontinae) distributed in part of bolivia, paraguay, argentina and brazil. its diploid number has been described as 56 acrocentric chromosomes decreasing in size and no karyotype figure has been depicted. herein, we present karyotypic data on p. simplex, including chromosome banding and molecular fluorescent in situ hybridization using telomeric sequences and the whole x-chromosome of its sister clade ho ... | 2013 | 23885202 |
| breeding of wild-caught rodent cricetidae holochilus brasiliensis under laboratory conditions. | the breeding of wild-caught rodent holochilus brasiliensis (desmarest, 1819) was studied under laboratory conditions. the mean gestation length was 28.4 days. litter size ranged from one to five. males matured at 2-3 months and females at 2-4.5 months of age. the oestrous cycle lasted 6-8 days. eleven pairs observed over 6-13 months increased to a population of 276 individuals (153 males and 123 females). | 1986 | 3540447 |
| orthohantavirus genotype lechiguanas in oligoryzomys nigripes (rodentia: cricetidae): new evidence of host-switching. | to identify and predict situations of increased risk of orthohantavirus infection in humans, it is necessary to study the relationships between the virus and its rodent hosts. the present study investigated orthohantavirus infection in an assemblage of wild sigmodontinae rodents of the paraná delta, argentina, and providing new evidence of host-switching events. rodents belonging to the species oxymycterus rufus (n = 187), akodon azarae (n = 82), oligoryzomys flavescens (n = 80), oligoryzomys ni ... | 2019 | 30599176 |