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[identification of the trematode echinoparyphium recurvatum (von linstow, 1873) in man and in a rodent from egypt]. 1977610631
[acroloxus lacustris (fam. ancylidae) as a new intermediate trematode host in the ussr].585 specimens of the mollusk acroloxus lacustris were parasitologically investigated in the divichin bay of the caspian sea. 3 species of cercarians (echinostoma sp., echinoparyphium recurvatum, asymphylodora sp.), 2 species of parthenites (echinostomatidae gen. sp. redia i, echinostomatidae gen. sp. redia ii) and 4 species of metacercarians (metacercaria gen. sp. i, metacercaria gen. sp. ii. metacercaria gen. sp. iii, tetracotyle sp.) were found in the specimens examined. a. lacustris is first ...1978643308
sites of encystment by the metacercariae of echinoparyphium recurvatum in lymnaea peregra.experimental infection of echinoparyphium recurvatum von linstow (digenea: echinostomatidae) cercariae in the snail second intermediate host lymnaea peregra müller shows that metacercarial encystment takes place on the lining of the mantle cavity, pericardial cavity and kidney lumen, with the mantle cavity the most preferred site. all three sites are accessible via the body openings. the metacercariae appear to be more susceptible to encapsulation in the visceral mass than in the cavity of the m ...19921640093
echinostoma revolutum and echinoparyphium recurvatum recovered from house rats in yangyang-gun, kangwon-do.during an investigation on intestinal flukes of house rats in yangyang-gun, kangwon-do, a total of 6 species of trematodes belonging to 3 families; echinostomatidae (echinostoma hortense, e. cinetorchis, e. revolutum and echinoparyphium recurvatum), diplostomidae (fibricola seoulensis) and plagiorchiidae (plagiorchis muris), were recovered from two adult rats. e. revolutum and e. recurvatum were new trematode faunae of rats in korea. e. revolutum had an elongated body, 5.3-6.0 mm long and 1.0-1. ...19902099177
speciation of echinostomes: evidence for the existence of two sympatric sibling species in the complex echinoparyphium recurvatum (von linstow 1873) (digenea: echinostomatidae).evidence for the existence of 2 first intermediate host-specific sibling species of the 45 collar-spined echinostome echinoparyphium recurvatum is presented. experimental studies on their life-cycles were carried out under controlled laboratory conditions. the two entities were found to be morphologically indistinguishable in all major respects, yet they exhibited distinct biological characteristics. one of the sibling species utilizes the freshwater lymnaeid pulmonate snail lymnaea peregra as f ...19902235072
the influence of second intermediate host dispersion pattern upon the transmission of cercariae of echinoparyphium recurvatum (digenea: echinostomatidae).transmission of cercariae of the echinostome digenean echinoparyphium recurvatum was observed in experimental populations of the second intermediate host snail lymnaea peregra. populations of 100 snails were distributed among plastic mesh cages in an infection arena to produce different patterns of host dispersion. cercarial transmission was investigated in host populations showing three separate patterns of host dispersion; ideal regular, random and contagious ('clumped'). levels of cercarial t ...19902235073
gastrointestinal helminths of the mexican duck, anas platyrhynchos diazi ridgway, from north central mexico and southwestern united states.twenty-five species of helminths, recovered from the gastrointestinal tracts of 129 mexican ducks from mexico and the united states, were all new host records. the species included: echinoparyphium recurvatum, echinostoma revolutum, hypoderaeum conoideum, notocotylus attenuatus, prosthogonimus cuneatus, zygocotyle lunata, anomotaenia ciliata, cloacotaenia megalops, diorchis bulbodes, diorchis sp., drepanidotaenia lanceolata, echinocotyle rosseteri, fimbriaria fasciolaris, fimbriarioides sp., hym ...19863951061
lead poisoning and parasitism in a flock of mute swans (cygnus olor) in scotland.increased mortality in a flock of non-breeding mute swans (cygnus olor) on a scottish loch was investigated. postmortem examinations were carried out on eight adult and six immature swans. the commonest cause of death, found in eight birds, was lead poisoning associated with the ingestion of large lead fishing weights. heavy parasitic burdens were found in five immature birds, involving combinations of the gizzard worm amidostomum species, the thornyheaded worms polymorphus minutus and profilico ...19989460217
life history of echinoparyphium recurvatum (trematoda: echinostomatidae) in korea.the present study was performed to observe characteristics of the life history of echinoparyphium recurvatum under both natural and laboratory conditions in korea. a batch of radix auricularia coreana was collected from sunamchon, one of the stream of west naktonggang (river), in kangso-gu, pusan during august and september 1992. out of 106 snails examined by crushing, 52 (49.0%) were infected with larval e. recurvatum, i.e. rediae, cercariae and metacercariae. cercariae naturally shed from snai ...19989637826
larval trematode infections in freshwater gastropods from the albufera natural park in spain.malacological samplings were made from january 1994 to december 1996 in the albufera natural park (valencia, spain) to trace the dynamics of molluscan populations and the prevalence and intensity of infection by larval trematodes. a total of 10,533 freshwater gastropods belonging to seven species (lymnaea auricularia, l. truncatula, l. palustris, l. peregra, bithynia tentaculata, physa acuta and gyraulus chinensis) was examined, and 110 (1.04%) were found to harbour some of the nine distinguisha ...19989639906
the influence of temperature on the survival and infectivity of the cercariae of echinoparyphium recurvatum (digenea: echinostomatidae).survival and infectivity characteristics are described for cercariae of the echinostome echinoparyphium recurvatum at 10, 15, 20, 25 and 30 degrees c. cercarial survival was markedly age- and temperature-dependent, maximum survival time being reduced from 68 h at 10 degrees c to 12 h at 30 degrees c, 50% survival times falling from 47.9 h at 10 degrees c to 8.4 h at 30 degrees c. the mean instantaneous per capita death rate of cercariae increased exponentially with temperature. cercarial infecti ...199910340329
biology of echinostomes except echinostoma.this review examines the significant literature on the biology of echinostomes, except echinostoma, for the following species rich genera: echinoparyphium, echinochasmus, himasthla, and hypoderaeum. coverage of these genera includes descriptive studies, life cycle studies, experimental and manipulative studies, and biochemical and molecular studies. coverage of other echinostome genera, i.e., petasiger, euparyphium, stephanoprora, isthmiophora, acanthoparyphium, and patagifer was mainly concerne ...200111461031
toxic effects of cadmium and zinc on the transmission of echinoparyphium recurvatum cercariae.the toxicity of cadmium, zinc and cd/zn mixtures to the transmission of echinoparyphium recurvatum (digenea: echinostomatidae) cercariae into the snail second intermediate hosts was investigated at concentrations ranging from 100 microg l-1 to 10 000 microg l-1 in both soft and hard water. a differential response in the infectivity of metal-exposed cercariae into lymnaea peregra and physa fontinalis was demonstrated which was dependent on the snail species being infected. exposure of l. peregra, ...200212015828
tegumental ultrastructures of echinoparyphium recurvatum according to developmental stages.the present study was performed to observe tegumental ultrastructure of echinoparyphium recurvatum according to developmental stages. worms (1, 3, 5 and 15-day old) were recovered from chicks experimentally infected with metacercariae from radix auricularia coreana. one-day old worms were elongated and ventrally concave, and covered with peg-like tegumental spines except the adjacent areas of the head crown and excretory pore. type i sensory papillae were distributed on the lip of the oral sucke ...200212073731
family-level covariation between parasite resistance and mating system in a hermaphroditic freshwater snail.genetic compatibility, nonspecific defenses, and environmental effects determine parasite resistance. host mating system (selfing vs. outcrossing) should be important for parasite resistance because it determines the segregation of alleles at the resistance loci and because inbreeding depression may hamper immune defenses. individuals of a mixed mating hermaphroditic freshwater snail, lymnaea ovata, are commonly infected by a digenetic trematode parasite, echinoparyphium recurvatum. we examined ...200212206245
cadmium toxicity and snail-digenean interactions in a population of lymnaea spp.the toxicity of cadmium to a population of lymnaea peregra and l. stagnalis naturally infected with a range of digeneans and collected from a number of sites in the lower thames valley, uk was investigated. lymnaeid snails were exposed to 100 microg l-1 cadmium and the effects on host survival and emergence of cercariae recorded. overwintered l. peregra, but not l. stagnalis, showed significantly reduced survival compared to seasonally infected snails, i.e. snails which have acquired an infectio ...200312590665
effects of cadmium and zinc toxicity on orientation behaviour of echinoparyphium recurvatum (digenea: echinostomatidae) cercariae.the effects of cadmium and zinc toxicity on orientation behaviour (photo- and geo-taxis) of echinoparyphium recurvatum cercariae was investigated at concentrations ranging from 10 to 1000 microg l(-1). exposure to the toxicants at all metal concentrations caused a change in orientation to negative phototaxis and positive geotaxis during the submaximal dispersal phase (0.5 h cercarial age). autometallography staining of cercariae exposed to 1000 microg l(-1) cadmium or zinc showed selective bindi ...200314524506
metacercarial utilization of a naturally infected single species (lymnaea peregra) snail community by echinoparyphium recurvatum.utilization of a single-species molluscan community of lymnaea peregra by metacercariae of echinoparyphium recurvatum over a summer (july-september) period in south-east england showed an increase in the mean number of cysts per host with host size and time of exposure. aggregation resulting from host and habitat-related factors increased with host size and time of exposure. encystment within the host was restricted to the peripheral organs in smaller juvenile snails but as snails increased in s ...200414972037
toxicity of anti-fouling biocides to encysted metacercariae of echinoparyphium recurvatum (digenea: echinostomatidae) and their snail hosts.the toxicity of the anti-fouling biocides tributyltin (tbto), copper, and irgarol 1051 (irgarol) at a nominal concentration of 10 microg/l over a 30 day period were investigated against the viability of metacercarial cysts of the digenean parasite echinoparyphium recurvatum resident within the body of two common freshwater snails, lymnaea peregra and physa fontinalis. reduced parasite viability was found under most exposures in both snail species. however a greater effect of toxicant exposure wa ...200415183997
influence of cadmium exposure on the incidence of first intermediate host encystment by echinoparyphium recurvatum cercariae in lymnaea peregra.the effect of cadmium exposure of the snail first intermediate host lymnaea peregra on the incidence of encystment of echinoparyphium recurvatum (digenea: echinostomatidae) cercariae without emergence from the snail was investigated. exposure to 100 microg l(-1) cd for 72 h caused a significant increase in the incidence of first host encystment when compared to controls. in addition, autometallographic staining of e. recurvatum daughter rediae and developing cercariae showed that there was metal ...200415575990
temporal variation in prevalence and abundance of metacercariae in the pulmonate snail lymnaea stagnalis in chany lake, west siberia, russia: long-term patterns and environmental covariates.infrapopulations of trematode metacercariae were monitored in the snail lymnaea stagnalis over 17 yr (1982-1999) at chany lake, novosibirskaya oblast', russia. eighteen trematode species were recorded. patterns of occurrence varied from 4 species (echinoparyphium aconiatum, echinoparyphium recurvatum, moliniella anceps, and cotylurus cornutus) that persisted at relatively high prevalence (> 60% of samples) across sites, seasons, and years, to species that were very rare and sporadic in occurrenc ...200616729680
[taxonomic, topical and quantitative structure of the community of intestinal flukes (digenea) of mallards, anas platyrhynchos linnaeus, 1758 from the area of szczecin].taxonomic, topical and quantitative structure of the community of intestinal flukes (digenea) of mallards, anas platyrhynchos linnaeus, 1758 from the area of szczecin. a total of 55 mallards (anas platyrhynchos l.) from the area of szczecin were examined for the presence of intestinal flukes (digenea). this study covered the taxonomic structure (specific composition and taxonomic affiliation of the parasites), topical structure (parasites' distribution within the host's organism), and quantitati ...200216894718
the effects of temperature on the distribution and establishment of echinoparyphium recurvatum metacercariae in lymnaea peregra.the establishment and distribution of echinoparyphium recurvatum metacercariae in the second intermediate host, lymnaea peregra, were investigated at a temperature range of 5-29 degrees c. preliminary studies on the survival and infectivity of e. recurvatum cercariae showed that both parameters were temperature dependent. no cercarial transmission occurred at 5 or 10 degrees c. nevertheless, the transmission efficiency (1/h0) indicated that transmission was temperature independent in the tempera ...200717711598
identification problems with species in the echinoparyphium recurvatum complex from physid snails in the usa.this study was done to help us answer numerous requests that we get about the identity of 45-collar-spined echinostomes in the genus echinoparyphium. we examined 45-collar-spined cercariae from physid snails collected in europe and the usa. morphological observations of these cercariae showed considerable similarities in most of the characteristics we examined in these cercariae. similar findings were made of adults obtained from natural and experimentally infected avian hosts in europe and the ...200818594864
the effects of host size and temperature on the emergence of echinoparyphium recurvatum cercariae from lymnaea peregra under natural light conditions.the production of cercariae from their snail host is a fundamental component of transmission success in trematodes. the emergence of echinoparyphium recurvatum (trematoda: echinostomatidae) cercariae from lymnaea peregra was studied under natural sunlight conditions, using naturally infected snails of different sizes (10-17 mm) within a temperature range of 10-29 degrees c. there was a single photoperiodic circadian cycle of emergence with one peak, which correlated with the maximum diffuse sunl ...201020078900
field evidence for a parasite spillback caused by exotic mollusc dreissena polymorpha in an invaded lake.this study provides field evidence in support of the "parasite spillback hypothesis" that predicts a positive numerical response of native parasites to the presence of an exotic host that is competing for these parasites with native hosts. we examined the role that the exotic mollusc dreissena polymorpha (zebra mussel) plays as the second intermediate host of the echinostomatid trematode echinoparyphium recurvatum in lake naroch, belarus. we found that due likely to the disproportionately high a ...201020107837
genetic characterization of echinostoma revolutum and echinoparyphium recurvatum (trematoda: echinostomatidae) in thailand and phylogenetic relationships with other isolates inferred by its1 sequence.echinostomatidae are common, widely distributed intestinal parasites causing significant disease in both animals and humans worldwide. in spite of their importance, the taxonomy of these echinostomes is still controversial. the taxonomic status of two species, echinostoma revolutum and echinoparyphium recurvatum, which commonly infect poultry and other birds, as well as human, is problematical. previous phylogenetic analyses of southeast asian strains indicate that these species cluster as siste ...201021120529
genetic variation and relationships of four species of medically important echinostomes (trematoda: echinostomatidae) in south-east asia.multilocus enzyme electrophoresis (mee) and dna sequencing of the mitochondrial cytochrome c oxidase subunit 1 (co1) gene were used to genetically compare four species of echinostomes of human health importance. fixed genetic differences among adults of echinostoma revolutum, echinostoma malayanum, echinoparyphium recurvatum and hypoderaeum conoideum were detected at 51-75% of the enzyme loci examined, while interspecific differences in co1 sequence were detected at 16-32 (8-16%) of the 205 alig ...201021129506
scanning electron microscopy of adult echinoparyphium recurvatum (von linstow, 1873) (digenea: echinostomatidae) from britain.the surface topography of 15-day-old adult echinoparyphium recurvatum (von linstow, 1873) sensu stricto, from an isolate of the parasite utilizing lymnaea peregra as first intermediate host in southern england, is described and illustrated using scanning electron microscopy, and is compared to those of other echinoparyphium species from europe, and with those of e. recurvatum of east asian origin. the general morphology of tegumental features was found to be very similar to that of worms of the ...201121208510
thermodynamics of cercarial survival and metabolism in a changing climate.summarycercariae are non-feeding free-living stages in the life cycles of trematodes, highly influenced by temperature. their life span is brief, limited by the depletion of a non-renewable glycogen store. warmer temperatures under the influence of climate change may promote the transmission of parasites and therefore understanding their thermobiology forms an important step in discerning the future dynamics of parasite populations. an empirical relationship exists between cercarial mean expecte ...201121819641
digenean communities in the tufted duck [aythya fuligula (l., 1758)] and greater scaup [a. marila (l., 1761)] wintering in the north-west of poland.a total of 124 specimens of the tufted duck, aythya fuligula, and 63 greater scaup, a. marila, were examined for digenean parasites. both duck species, which overwinter in a coastal lake connected with the southern baltic (north-west poland) were found to support amblosoma exile, cyathocotyle prussica, paracoenogonimus ovatus, australapatemon minor, cotylurus cornutus, echinoparyphium recurvatum, echinostoma revolutum and notocotylus attenuatus. in addition, the tufted duck hosted hypoderaeum co ...201322677200
biodiversity of trematodes in their intermediate mollusc and fish hosts in the freshwater ecosystems of europe.we analysed two novel databases containing 2,380 and 8,202 host-parasite-locality records for trematode parasites of molluscs and fishes, respectively, to assess the biodiversity of trematodes in their intermediate mollusc and fish hosts in the freshwater environment in europe. the "mollusc" dataset covers large numbers of pulmonate (29 spp.), "prosobranch" (15 spp.) and bivalve (11 spp.) molluscs acting as first intermediate hosts for 171 trematode species of 89 genera and 35 families. of these ...201626898591
surface topography of two trematodes parasites infecting grey heron ardea cinerea jouyi (aves, ciconiiformes) in qena, egypt.apharyngostrigea ardeolina and echinoparyphium recurvatum are two important digenean parasites that were recovered from small intestine of grey heron with an infection rate (16.2%) and (8.8%) respectively. the surface topography of two species was redescribed by both light and scanning electron microscopy. using sem studies showed that the body surface of two trematodes were covered by contact receptors, several types of sensory tegumental papillae which may have useful function in orientation a ...201526012229
[the evaluation of snail host-trematode parasite trophic relationships using stable isotope analysis].stable isotope ratios of carbon (13c/12c, δ13c) and nitrogen (15n/14n, δ15n) in snail-host tissue (the foot and hepatopancreas) and trematode parasites on two stages of their life cycle were analyzed. trophic structure in co-occurring trematode larvae was examined in the following species: five species of cercariae (echinoparyphium recurvatum, hypodereum conoideum, plagiorchis mutationis, diplostomum chromatophorum and d. volvens) and two species of metacercariae (cotylurus cornutus and echinopa ...201525693325
morphological and molecular analyses of larval and adult stages of echinoparyphium recurvatum von linstow 1873 (digenea: echinostomatidae) from central mexico.in central mexico, populations of the freshwater snail physella cubensis were infected with metacercariae from a species of echinoparyphium (digenea: echinostomatidae). in the current study, we describe both larval and adult stages of this species obtained from experimental and natural infections. a total 180 snails were collected from patzcuaro lake, michoacan state in central mexico in july 2012. in the laboratory snails were placed in individual vials and exposed to light with the aim of obse ...201524739119
zoonotic echinostome infections in free-grazing ducks in thailand.free-grazing ducks play a major role in the rural economy of eastern asia in the form of egg and meat production. in thailand, the geographical location, tropical climate conditions and wetland areas of the country are suitable for their husbandry. these environmental factors also favor growth, multiplication, development, survival, and spread of duck parasites. in this study, a total of 90 free-grazing ducks from northern, central, and northeastern regions of thailand were examined for intestin ...201324516271
observations on the development of two echinostomes, echinoparyphium recurvatum and echinostoma revolutum, the antagonists of human schistosomes in egypt. 19744472221
antagonistic interaction between echinostoma revolutum and echinoparyphium recurvatum (trematoda) in the definitive host. 19744412040
antagonism of echinoparyphium recurvatum against schistosoma haematobium in the snail bulinus truncatus. 19744412038
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