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molluscs interfering with the capacity of fasciola hepatica miracidia to infect lymnaea truncatula.fasciola hepatica miracidia labelled with radioselenium were used to study aspects of their host-finding capacity by determining radioactivity subsequently taken up by exposed 'target' snails (lymnaea truncatula). possible interfering effects exercised by a number of non-host snails and bivalves were examined in linear test channels. the infection rate (radioactivity) among 'target' snails was markedly lowered when non-host lymnaea species (l. pereger, l. palustris, l. stagnalis) were interposed ...1976980539
the suitability of several aquatic snails as intermediate hosts for angiostrongylus cantonensis.sixteen species of aquatic snails of four families were tested by quantitative technique under standardized conditions for their suitability as intermediate hosts for angiostrongylus cantonensis. these species were the planorbid snails biomphalaria glabrata, biomphalaria alexandrina, planorbis planorbis, planorbis intermixtus, bulinus truncatus, bulinus contortus, bulinus africanus, bulinus tropicus and helisoma sp.; the lymnaeid snails lymnaea natalensis, lymnaea tomentosa, lymnaea stagnalis, a ...19751189583
a study on snail location by fasciola hepatica using radioisotopically labelled miracidia.a number of common freshwater molluscs were exposed to fasciola hepatica miracidia labelled in vivo with radioselenium. radioactivity was rapidly incorporated in all lymnaeid species tested (l. stagnalis, l. tomentosa and l. truncatula) whereas no radioactivity could be demonstrated in non-lymnaeid pulmonate species (aplexa hypnorum, physa acuta, physa fontinalis, anisus vortex, gyraulus albus and planorbis planorbis) or in the prosobranchs valvata cristata and valvata piscinalis. however, the p ...19761264488
[cercarial chaetotaxy of echinostoma revolutum (froelich, 1802) and e. echinatum (zeder, 1803) (trematoda, echinostomatidae)].the life-cycles of echinostoma revolutum and e. echinatum were carried out by using cercariae emitted by naturally infected molluscs. e. revolutum strain was issued from lymnaea auricularia, e. echinatum from lymnaea truncatula and planorbis planorbis, planorbarius corneus produced an echinostome which may possibly be e. echinatum or another species e. sp. metacercarial stages and adults were obtained from laboratory experimental hosts. none of these adult echinostomes displayed well-defined mor ...19873662328
water snails as paratenic hosts of hymenolepididae fuhrmann, 1907 in czechoslovakia.the distribution of cysticercoids of hymenolepididae fuhrmann, 1907 parasitizing water birds (anseriformes and ralliformes) in czechoslovakia was studied. a total of 2970 snail specimens (429 lymnaea stagnalis (l.), 531 l. ovata (drap.), 1, 462 l. peregra (o. f. müll.), 158 l. auricularia (l.), 262 planorbis planorbis (l.) and 65 viviparus viviparus (l.)) were examined for this purpose. among them, 122 snails were infected with cysticercoids of 13 cestode species (dicranotaenia coronula (dujardi ...19863758867
[superficial argentophilic structures of miracidia and cercaria of paramphistomum leydeni nasmark 1937].the life cycle of paramphistomum leydeni näsmark, 1937, is carried out in the laboratory. adults were obtained from the rumen of a naturally infected bos taurus in czechoslovakia. laboratory-reared planorbis planorbis experimentally infected shed the first cercariae two months after exposure to miracidia. argentophilic structures in miracidia and cercariae are described. in miracidia, these structures are similar to those previously described from species of paramphistomum: p. togolense, p. phil ...19846721375
efficacy of clostridium bifermentans serovar malaysia on target and nontarget organisms.clostridium bifermentans serovar malaysia (c.b.m.) is highly toxic to mosquito larvae. in this study, the following aquatic nontarget invertebrates were treated with high c.b.m. concentrations (up to 1,600-fold the toxic concentration for anopheles stephensi) to study their susceptibility towards the bacterial toxin: planorbis planorbis (pulmonata); asellus aquaticus (isopoda); daphnia pulex (cladocera); cloeon dipterum (ephemeroptera); plea leachi (heteroptera); and eristalis sp., chaoborus cry ...19947912261
effect of six non-target snails on schistosoma mansoni miracidial host finding and infection of biomphalaria alexandrina under laboratory conditions.six snail species naturally associated with biomphalaria alexandrina, the snail host of schistosoma mansoni in egypt, were tested under standard laboratory conditions, for impact on miracidial host findings and infection of the snail host. these snails are the prosobranchs melanoides tuberculata, cleopatra bulimoides, bellamys unicolor and lanistes carinatus, the pulmonates planorbis planorbis and physa acuta. the tested snail ssp. reduced considerably the infection rate of biomphalaria with s. ...19989707684
re-validation of echinostoma miyagawai ishii, 1932 (digenea: echinostomatidae) on the basis of the experimental completion of its life-cycle.the life-cycle of echinostoma miyagawai, a eurasian species closely related to e. revolutum, was completed in the laboratory, and the morphology of the larval stages and the adults obtained experimentally was studied. planorbis planorbis and anisus vortex were the first intermediate hosts in the brackish lake durankulak on the bulgarian black sea coast. characteristic features of the cercaria include: a prominent collar with 37 spines; a tail as long as the body and with seven conspicuous fin-fo ...200010743854
correlation between snails and fish in fish ponds of world fish center (iclarm) with special reference to snail vectors of schistosomiasis and fascioliasis.the abundance of snail species in earthen fish ponds, irrigation and drainage canals at world fish center (iclarm) in descending order was bellamya unicolor (50.89%) > physa acuta (18.94%) > cleopatra bulimoides (7.6%) > lanistes carinatus (6.73%) > bulinus truncatus (5.19%) > melanoides tuberculata (4.83%) > lymnaea natalensis (3.14%) > gabbiella senaariensis (0.9%) > biomphalaria alexandrina (0.55%) > lym naea truncatula (0.4%) > planorbis planorbis and succinea cleopatra (0.33%) > ferrissia i ...200314964656
effect of water plants and non-target snails on the infectivity of bulinus truncatus with schistosoma haematobium.the application of the water plant (ceratophyllum demersum, eichhornia crassipes and lemna gibba) and/or non-target snails (planorbis planorbis, physa acuta and melanoides tuberculata) gave a significant degree of reduction in the infection rate of b. truncatus subjected to s. haematobium miracidia. the data also indicated a reduction in mean total number of cercarial production/snail. however, no significant difference was detected in the prepatent period and duration of cercarial shedding of t ...200516333895
determination of definitive and intermediate hosts of cercarial dermatitis-producing agents in northern iran.the study concerns the prevalence of avian schistosomes in intermediate and definite hosts in mazandaran province, northern iran.200616649371
[the studies of the invasion of alaria alata (goeze,1782) in the province of kuyavia and pomerania].the studies were conducted between 1999 and 2001 in two hunting regions. larval alariosis was revealed in the boars only in one of the studied regions. in this region, the results of the parasitological studies, conducted towards a. alata in the direct host (domestic dogs) and indirect hosts (snails: planorbis planorbis and anisus vortex as well as frogs: rana temporaria and rana terrestris) were also positive. the lack of the host snails a. alata in the other region might have resulted from no ...200116894758
effect of non target snails on some biological of lymnaea natalensis snails and their infection to fasciola gigantica.the influence of non-target freshwater snails (melanoides tuberculata and planorbis planorbis) on the capacity of fasciola egg production f. gigantica miracidia to infect lymnaea natalensis and their effect on mortality and growth rates showed that the snails exhibited a competitive ability against l. natalensis. the mortality rate existed in mixed cultures with snails was greatly increased, and increased with increase of snails number. the egg production and growth rate were negatively affected ...200617153707
larval trematodes (digenea) of planorbid snails (gastropoda: pulmonata) in central europe: a survey of species and key to their identification.a survey of the larval stages (cercariae and metacercariae) of trematodes (digenea) found in planorbid snails in central europe (austria, czech republic, south-east germany, hungary, poland and the slovak republic) is presented based on a study of 7,628 snails of 12 species examined between 1998-2006. a total of 34 trematode larval stages, comprising cercariae of 28 species and metacercariae of seven species (one species occurred both as cercaria and metacercaria) of nine families were found in ...200818210216
bird schistosomes in planorbid snails in the czech republic.bird schistosomes have been in focus as causative agents of cercarial dermatitis of humans in the last years; however, our knowledge of their species spectrum and intermediate host specificity is still insufficient. our study focused on bird schistosomes developing in planorbid snails that have been less studied so far. from 2001 to 2010, cercariae of bird schistosomes were found in four snail species (gyraulus albus, segmentina nitida, anisus vortex and planorbis planorbis) from seven localitie ...201122079682
detection of planorbis planorbis and anisus vortex as first intermediate hosts of alaria alata (goeze, 1792) in natural conditions in france: molecular evidence.alaria alata (goeze, 1792), a trematode that parasitizes canids, usually needs two intermediate hosts to complete its life cycle: an aquatic freshwater snail and an amphibian. although many studies have been undertaken on the wild boar's role as paratenic host, owing to the potential threat to human health, few have sought to identify the snails that act as first intermediate hosts in natural conditions. adopting a molecular approach, with specific markers for a portion of the second internal tr ...201222795938
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
[differences in the infestation rate of young cyprinid fishes (cypriniformes) by metacercaria of posthodiplostomum cuticola (digenea, diplostomatidae) in river and lake systems of the lake chany basin (western siberia)].a total of 12 fish species were studied for the invasion of p. cuticola (nordmann, 1832) metacercariae in the chany lake estuaries, river and lake systems during different periods of water level. all infected individuals were represented by juveniles of the family cyprinidae, except for adults of the dace leuciscus leuciscus. (l.). under an average water level (2010) the highest rate of fish invasion was revealed in the estuary zone, where the prevalence of infection (pi) constituted 37.5%, 13.4 ...201525693328
morphology and molecules reveal the alien posthodiplostomum centrarchi hoffman, 1958 as the third species of posthodiplostomum dubois, 1936 (digenea: diplostomidae) in europe.metacercariae of two species of posthodiplostomum dubois, 1936 (digenea: diplostomidae) were subjected to morphological and molecular studies: p. brevicaudatum (von nordmann, 1832) from gasterosteus aculeatus (l.) (gasterosteiformes: gasterosteidae), bulgaria (morphology, cox1 and its1-5.8s-its2) and perca fluviatilis l. (perciformes: percidae), czech republic (morphology, cox1, its1-5.8s-its2 and 28s); and p. centrarchi hoffman, 1958 from lepomis gibbosus (l.) (perciformes: centrarchidae), bulg ...201728062983
impact of certain plants and synthetic molluscicides on some fresh water snails and fish.the lc50 (78, 85 ppm) and lc90 (88, 135 ppm) of anagalis arvensis and calendula micrantha respectively against biomphalaria alexandrina were higher than those of the non-target snails, physa acuta, planorbis planorbis, helisoma duryi and melanoides tuberculata. in contrast, the lc50 of niclosamide (0.11 ppm) and copper sulphate (cuso4) (0.42 ppm) against b. alexandrina were lower than those of the non-target snails. the mortalities percentage among non-target snails ranged between 0.0 & 20% when ...200516333905
experimental observations on the specificity of strigea falconispalumbi (trematoda: strigeidae) toward planorbid first intermediate hosts.planorbis planorbis, planorbarius corneus and biomphalaria alexandrina (egyptian strain) were ascertained as new experimental first intermediate hosts, thus bringing the total number of planorbid experimental first intermediate hosts to eight. the highest degree of compatibility was exhibited with p. planorbis (infection prevalence 80%) followed by p. corneus (46.6%), whereas b. alexandrina (as snail species not occurring in the geographical range of s. falconispalumbi) showed the lowest degree ...19911928800
morphology of neurosecretory cells in basommatophoran snails homologous with egg-laying and growth hormone-producing cells of lymnaea stagnalis.in a light and electron microscope study, neurosecretory cells morphologically homologous with the egg-laying hormone-producing caudodorsal cells (cdc) and growth hormone-producing dorsal cells (dc, light green cells) of the freshwater basommatophoran snail lymnaea stagnalis have been found in five genera (seven species) of basommatophora, viz. in lymnaea palustris and lymnaea ovata, in planorbis planorbis and planorbis vortex, in planorbarius corneus, in bulinus truncatus, and in biomphalaria g ...19873623071
developmental and comparative aspects of nonsynaptic release by the egg-laying controlling caudodorsal cells of basommatophoran snails.in an immunoelectron microscope study the postembryonic development of the cerebral caudodorsal cells (cdc) in the freshwater snail lymnaea stagnalis was studied as well as the development of similar neurons in other basommatophoran families. the cdc of adult l. stagnalis control egg-laying and associated behaviors by releasing various peptides, including the ovulation hormone cdch. the cdc release peptides from neurohemal axon terminals and from nonsynaptic release sites of axon collaterals. du ...19892767405
morphological and molecular data for larval stages of four species of petasiger dietz, 1909 (digenea: echinostomatidae) with an updated key to the known cercariae from the palaearctic.large-tailed echinostomatid cercariae of the genus petasiger dietz, 1909 (digenea: echinostomatidae) from the planorbid snails gyraulus albus (müller) and planorbis planorbis (l.) collected in germany and the czech republic and metacercariae from gasterosteus aculeatus l. (gasterosteiformes: gasterosteidae) collected in canada are characterised morphologically and molecularly. the rediae, cercariae and metacercariae are described in detail and compared with the existing data on the larval stages ...201425204601
cercarial chaetotaxy of echinostoma miyagawai ishii, 1932 (digenea: echinostomatidae), with a review of the sensory patterns in the 'revolutum' group.the chaetotaxy of cercaria of the echinostome echinostoma miyagawai, found in naturally infected planorbis planorbis in a brackish water lake in bulgaria, is described and figured. comparisons with sensory patterns of cercariae of e. revolutum, e. echinatum, echinostoma sp.? echinatum, e. audyi, e. lindoense, e. trivolvis, e. caproni and e. jurini, described by kanev et al. (1987), lie (1966), dimitrov et al. (1997), richard (1971), richard & brygoo (1978) and dimitrov & kanev (1992), showed the ...199910629728
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