scholarly journals Trematode cercariae infections in freshwater snails of Chitwan district, central Nepal

2011 ◽  
Vol 7 (9) ◽  
pp. 9-14 ◽  
Author(s):  
Ramesh Devkota ◽  
Prem Bahadur Budha ◽  
Ranjana Gupta
Keyword(s):  
Freshwater Snail ◽  
Temporary Ponds ◽  
Freshwater Snails ◽  
Snail Species ◽  
Double Infection ◽  
Melanoides Tuberculata ◽  
Central Nepal ◽  
Pila Globosa ◽  
Indoplanorbis Exustus ◽  
Bellamya Bengalensis

Because Nepal has been virtually unexplored with respect to its trematode fauna, we sampled freshwater snails from grazing swamps, lakes, rivers, swamp forests, and temporary ponds in the Chitwan district of central Nepal between July and October 2008. Altogether we screened 1,448 individuals of nine freshwater snail species (Bellamya bengalensis, Gabbia orcula, Gyraulus euphraticus, Indoplanorbis exustus, Lymnaea luteola, Melanoides tuberculata, Pila globosa, Thiara granifera and Thiara lineata) for shedding cercariae. A total of 4.3% (N=62) infected snails were found, distributed among the snail species as follows (B. bengalensis - 1, G. orcula - 11, G. euphraticus - 8, I. exustus - 39, L. luteola - 2 and T. granifera - 1). Collectively, six morphologically distinguishable types of trematode cercariae were found: amphistomes, brevifurcate-apharyngeate (likely mammalian schistosomes), clinostome, gymnocephalus (likely fasciolid), longifurcate-pharyngeate and xiphidiocercaria. I. exustus had the highest prevalence of trematode infection, and harbored all the noted cercarial types except gymnocephalus cercariae. One double infection (xiphidiocercaria and longifurcate-pharyngeate cercaria) was found in this snail. Amphistome cercariae were common in G. euphraticus, G. orcula, and I. exustus. The highest prevalence of infection (38.3%) was recorded among snails collected from temporary ponds.DOI: http://dx.doi.org/10.3126/hjs.v7i9.2183 Himalayan Journal of Sciences Vol.7 Issue 9 2011 pp.9-14

MOLLUSCAN DIVERSITY WITH PARTICULAR EMPHASIS TO SNAILS IN DISTRICT GAUTAM BUDH NAGAR (U.P.) INDIA

2018 ◽  
Vol 24 (2) ◽  
Author(s):  
LOMESH KUMAR TYAGI
Keyword(s):  
Lymnaea Stagnalis ◽  
The Other ◽  
Marked Variation ◽  
Melanoides Tuberculata ◽  
Pila Globosa ◽  
Indoplanorbis Exustus ◽  
Molluscan Diversity ◽  
Radix Auricularia ◽  
Molluscan Species ◽  
Bellamya Bengalensis

Present investigation reveals molluscan diversity of the 4 selected sites viz., Tilpata Karanbas, Manhcha, Latifpur and Atta Gujran in the vicinity of district Gautam Budh Nagar (U.P.). As many as 22 species of molluscs under 9 families were collected. There were 19 species of snails viz ., Bellamya bengalensis , B. dissimilis , B. crassa , Lymnaea ( Pseudosuccinea ) acuminata f. hians , L. luteola f. ovalis , L. acuminata f. patula , L . ( Radix ) auricularia , L . ( Lymnaea ) stagnalis , L . acuminata f. gracilior , Pila globosa , Indoplanorbis exustus , Gyraulus convexiculus , G. pankongensis , Planorbis planorbis var. tangitarensis , Hydrobioides nassa, Thiara ( Melanoides ) tuberculata , Thiara ( Thiara ) scabra, T. ( M .) trigrina and Brotia ( Antimelania ) costula under 6 families. The other molluscs were Parreysia ( Parreysia ) favidens , Corbicula striatella and Lamellidens marginalis . There has been a marked variation in the composition of molluscan species collected from different habitats.

scholarly journals Infection status and molecular identification of digenean cercariae in snails in Kim Son district, Ninh Binh Province and Ba Vi district, Ha Noi

2019 ◽  
Vol 41 (3) ◽  
Author(s):  
Pham Ngoc Doanh ◽  
Hoang Van Hien ◽  
Bui Thi Dung ◽  
Ho Thi Loan
Keyword(s):  
Fasciola Gigantica ◽  
Trematode Species ◽  
Pomacea Canaliculata ◽  
Freshwater Snails ◽  
Snail Species ◽  
Infection Rates ◽  
Molecular Method ◽  
Melanoides Tuberculata ◽  
Haplorchis Pumilio ◽  
First Time

In this study, the molecular method was used to identify digenean cercariae from freshwater snails in Kim Son District (Ninh Binh Province) and Ba Vi District Ha Noi. A total of 9 snail species were collected and examined for cercarial infection. Three snail species (Radix swinhoei, Angulyagra polyzonata and Pomacea canaliculata) were not infected, while the other 6 species (Austropeplea viridis, Gyraulus convexiusculus, Parafossarulus striatulus, Bithynia fuchsiana, Melanoides tuberculata and Tarebia granifera) were infected with digenean cercariae at low infection rates, ranging from 2.3% to 6.3%. Seven cercarial groups were identified: Echinostome, Monostome, Parapleurophocercaria, Xiphidiocercaria, Fucocercaria, Gymnocephalous and Megalurous. Snails M. tuberculata and P. striatulus were infected with 4 cercarial groups, A. viridis and G. convexiusculus snails were infected with 2 groups, 2 snail species B. fuchsiana and T. granifera were infected with one group of cercaria. The results of ITS2 sequences analyses of the cercarial groups identified the larvae of 9 trematode species, namely Echinostoma revolutum, Echinochasmus japonicus, Notocotylus intestinalis, Philophthalmus gralli, Haplorchis pumilio, Procerovum cheni, Fasciola gigantica, Australapatemon burti and Cyathocotyle prussica. Among them the last three species, P. cheni, A. burti and C. prussica, were found for the first time in Vietnam. In addition, the ITS-2 sequence of Gymnocephalous cercariae which was previously identified as Sphaeridiotrema monorchis, from P. striatulus snail was 97% similar to that of Sphaeridiotrema pseudoglobulus. Likewise, ITS-2 sequence of Echinostome cercaria from B. fuchsiana snail was 93% similar to that of E. japonicus and that of Xiphidiocercaria cercaria from M. tuberculata snail was 93% similar to Lecithodendrium spathulatum. 

scholarly journals Community structure and systematic study of Helminth parasites of freshwater snails of the Chittagong University Campus

2016 ◽  
Vol 44 (1) ◽  
pp. 9-30
Author(s):  
Mahabuba Hasnath ◽  
Md Abdul Gofur Khan
Keyword(s):  
Community Structure ◽  
Developmental Stages ◽  
Freshwater Snails ◽  
Helminth Parasites ◽  
University Campus ◽  
Parasite Diversity ◽  
Pila Globosa ◽  
Low Prevalence ◽  
High Parasite ◽  
Bellamya Bengalensis

In all, 13 parasite taxa - eight cercariae, three nematodes, one rhabdocoel and one aspidogastrean - were recorded from 205 out of the 642 snails autopsied. Of the carcariae, xiphidiocercous was the most diversified (five taxa), followed by the echinostome (two) and the furcocercous (one). Infection by the nematodes, though rather poor in diversity, was much higher (23.99%) than that (12.15%) by the developmental stages of Trematoda. The rhabdocoel and the aspidogastrean were minor infestors having 1.56% and 2.80% prevalence, respectively. Bellamya bengalensis was the most abundant host, had the highest parasite diversity (12 taxa) and also the highest prevalence of infection (51.59%). Though the second highest abundant host, Paludomus blanfordiana had the least parasite diversity (only an oxyurid nematode) and a very low prevalence (2.04%) as well. Brotia costula, the big strong snail harboured two taxa (a carcaria and a nematode), and also had a low prevalence (8.65%). The amphibious Pila globosa, though least abundant among the four hosts, had moderately high parasite diversity (four carcariae and two nematodes) and prevalence (40.26%).Bangladesh J. Zool. 44(1): 9-30, 2016

scholarly journals Toxicity of Metals to a Freshwater Snail,Melanoides tuberculata

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
M. Shuhaimi-Othman ◽  
R. Nur-Amalina ◽  
Y. Nadzifah
Keyword(s):  
Concentration Factor ◽  
Soft Tissues ◽  
Toxic Metal ◽  
Freshwater Snail ◽  
Freshwater Snails ◽  
Freshwater Gastropods ◽  
Melanoides Tuberculata ◽  
Laboratory Conditions ◽  
Mn Concentrations

Adult freshwater snailsMelanoides tuberculata(Gastropod, Thiaridae) were exposed for a four-day period in laboratory conditions to a range of copper (Cu), cadmium (Cd), zinc (Zn), lead (Pb), nickel (Ni), iron (Fe), aluminium (Al), and manganese (Mn) concentrations. Mortality was assessed and median lethal times (LT50) and concentrations (LC50) were calculated. LT50and LC50increased with the decrease in mean exposure concentrations and times, respectively, for all metals. The LC50values for the 96-hour exposures to Cu, Cd, Zn, Pb, Ni, Fe, Al, and Mn were 0.14, 1.49, 3.90, 6.82, 8.46, 8.49, 68.23, and 45.59 mg L−1, respectively. Cu was the most toxic metal toM. tuberculata, followed by Cd, Zn, Pb, Ni, Fe, Mn, and Al (Cu > Cd > Zn > Pb > Ni > Fe > Mn > Al). Metals bioconcentration inM. tuberculataincreases with exposure to increasing concentrations and Cu has the highest accumulation (concentration factor) in the soft tissues. A comparison of LC50values for metals for this species with those for other freshwater gastropods reveals thatM. tuberculatais equally sensitive to metals.

scholarly journals Cryptic speciation in freshwaters: are speciation in lentic species shaped by paleohydrological events?

2021 ◽  
Author(s):  
Maitreya Sil ◽  
Abhishikta Roy ◽  
Tenzin Palden ◽  
Poorna Bhat ◽  
K. Praveen Karanth ◽  
...  
Keyword(s):  
Indian Subcontinent ◽  
Freshwater Snail ◽  
Snail Species ◽  
Cryptic Speciation ◽  
Cryptic Diversity ◽  
Niche Modelling ◽  
Putative Species ◽  
Species Complexes ◽  
Biotic Diversity ◽  
Pila Globosa

The Indian subcontinent is extremely diverse in terms of its flora and fauna. However, there is a severe underestimation of the biotic diversity in invertebrate groups as well as a lack of understanding of the processes generating diversity in these groups. Here we aimed to jointly estimate the cryptic diversity of two freshwater snail species complexes, Pila globosa and Pila virens, and uncover the processes behind the speciation in these groups. We employed phylogenetic, morphometric, population genetic and niche modelling technique to address these questions. We found out that both species complexes consist of several genetically and ecologically distinct putative species. The speciation was primarily driven by allopatric isolation into different river basins. A combination of paleoclimatic and paleohydrological changes during the Miocene have shaped the speciation events. Local climatic adaptation also could have contributed towards some of the speciation events. The study sheds light on the complex interaction between the biology of the species and the environment that shape the diversification patterns in a group.

scholarly journals Infection status and molecular identification of digenean cercariae in snails in Kim Son district, Ninh Binh Province and Ba Vi district, Ha Noi

2019 ◽  
Vol 41 (3) ◽  
Author(s):  
Pham Ngoc Doanh ◽  
Hoang Van Hien ◽  
Bui Thi Dung ◽  
Ho Thi Loan
Keyword(s):  
Fasciola Gigantica ◽  
Trematode Species ◽  
Pomacea Canaliculata ◽  
Freshwater Snails ◽  
Snail Species ◽  
Infection Rates ◽  
Molecular Method ◽  
Melanoides Tuberculata ◽  
Haplorchis Pumilio ◽  
First Time

In this study, the molecular method was used to identify digenean cercariae from freshwater snails in Kim Son District (Ninh Binh Province) and Ba Vi District Ha Noi. A total of 9 snail species were collected and examined for cercarial infection. Three snail species (Radix swinhoei, Angulyagra polyzonata and Pomacea canaliculata) were not infected, while the other 6 species (Austropeplea viridis, Gyraulus convexiusculus, Parafossarulus striatulus, Bithynia fuchsiana, Melanoides tuberculata and Tarebia granifera) were infected with digenean cercariae at low infection rates, ranging from 2.3% to 6.3%. Seven cercarial groups were identified: Echinostome, Monostome, Parapleurophocercaria, Xiphidiocercaria, Fucocercaria, Gymnocephalous and Megalurous. Snails M. tuberculata and P. striatulus were infected with 4 cercarial groups, A. viridis and G. convexiusculus snails were infected with 2 groups, 2 snail species B. fuchsiana and T. granifera were infected with one group of cercaria. The results of ITS2 sequences analyses of the cercarial groups identified the larvae of 9 trematode species, namely Echinostoma revolutum, Echinochasmus japonicus, Notocotylus intestinalis, Philophthalmus gralli, Haplorchis pumilio, Procerovum cheni, Fasciola gigantica, Australapatemon burti and Cyathocotyle prussica. Among them the last three species, P. cheni, A. burti and C. prussica, were found for the first time in Vietnam. In addition, the ITS-2 sequence of Gymnocephalous cercariae which was previously identified as Sphaeridiotrema monorchis, from P. striatulus snail was 97% similar to that of Sphaeridiotrema pseudoglobulus. Likewise, ITS-2 sequence of Echinostome cercaria from B. fuchsiana snail was 93% similar to that of E. japonicus and that of Xiphidiocercaria cercaria from M. tuberculata snail was 93% similar to Lecithodendrium spathulatum. 

scholarly journals Descriptions of strigea cercariae from the Gauteng and North West Provinces, South Africa

2012 ◽  
Vol 79 (1) ◽  
Author(s):  
Esmey B.E. Moema ◽  
Pieter H. King ◽  
Chantelle Baker
Keyword(s):  
Freshwater Snail ◽  
Freshwater Snails ◽  
Parasitic Diseases ◽  
Snail Species ◽  
Intermediate Hosts ◽  
North West ◽  
The North ◽  
Different Types ◽  
Microscopy Techniques ◽  
Lymnaea Natalensis

Freshwater snails are known to serve as first intermediate hosts for various parasitic diseases such as schistosomosis, amphistomosis and fasciolosis. Two freshwater snail species, Lymnaea natalensis, Krauss 1848 and Bulinus tropicus, Krauss 1848 were sampled from five localities in Gauteng and one locality in the North West Province from 2007 to 2010. These snails were collected in order to study their cercarial sheddings. They were found to be infected with three different types of strigea cercariae, of which the morphology was studied using standard light and scanning electron microscopy techniques.

scholarly journals Distribution of freshwater Mollusca in Koothaippar wetland ecosystem Tiruchirappalli District Tamil Nadu

2020 ◽  
Vol 13 (2) ◽  
pp. 091-098
Author(s):  
R. Ranjani ◽  
A. S. Maheswari
Keyword(s):  
Tamil Nadu ◽  
Wetland Ecosystem ◽  
Animal Group ◽  
Wetland Ecosystems ◽  
Pila Globosa ◽  
Indoplanorbis Exustus ◽  
Molluscan Fauna ◽  
Scientific Attention ◽  
Lamellidens Corrianus ◽  
Bellamya Bengalensis

Freshwater Mollusca form an important animal group of the wetland ecosystems. The distribution and availability in terms of number of species needs scientific attention. Present study is an attempt to document the available Molluscan forms in Koothaippar wetlands of Tiruchirappalli District. This study was carried out between summer 2013 to post-monsoon 2017. Nine species were recorded and among them 6 species belong to Gastropoda representing 2 orders, 3 families, 3 genera while 3 species were bivalves representing 1 order, 1 family and 2 genera. Bellamya bengalensis, Lamellidens marginalis and Pila globosa were the predominantly present molluscan fauna and are distributed throughout the year. Five species of Molluscan fauna (Pila virens, Pila scutata, Bellamya dissimilis, Indoplanorbis exustus and Lamellidens corrianus) are less abundant and Parreysia favidens was found to be rare species of the ecosystem. These Molluscan forms, representing different families ranging from 34% of Ampullariidae, 33% of Unionoida, 22% of Viviparoidae and 11% of Planorbidae. Percent distribution of these shelled organisms indicate that they represent 3 orders viz., 56% of Architaenioglossa, 33% of Unionoida and 11% of Hygrophila.

The life cycle and transmission dynamics of the larval stages ofHypoderaeum conoideum

2000 ◽  
Vol 74 (2) ◽  
pp. 165-172 ◽  
Author(s):  
C. Muñoz-Antolí ◽  
R. Toledo ◽  
J.G. Esteban
Keyword(s):  
Life Cycle ◽  
Freshwater Snail ◽  
Transmission Dynamics ◽  
Freshwater Snails ◽  
Snail Species ◽  
Intermediate Hosts ◽  
Free Living ◽  
Larval Stages ◽  
Life History Stages ◽  
First Intermediate Host

AbstractThe morphology of the different larval stages and life cycle ofHypoderaeum conoideum(Trematoda: Echinostomatidae) are described. The freshwater snail speciesLymnaea peregra(Gastropoda: Lymnaeidae) serves as the natural first intermediate host and this andL. corvusserve as experimental first intermediate hosts. These and other freshwater snails, such asPhysella acutaandGyraulus chinensis, in turn serve as second intermediate hosts. Adult worms were obtained from chicks and ducks, but not from rats, mice and golden hamsters. The morphology of the larval stages is compared with previous work onH. conoideum. Several aspects of the biology of the life history stages are described with emphasis on the transmission dynamics of the free-living stages. Differential suitability of the snail species that may act as first and/or second intermediate hosts is studied and discussed.

scholarly journals Survey of Fresh Water Snails in Vandeikya Local Government Area, Benue State Nigeria

2019 ◽  
pp. 1-8
Author(s):  
T. S. Atsuwe ◽  
J. I. Chikwendu ◽  
V. U. Obisike
Keyword(s):  
Local Government ◽  
Fresh Water ◽  
Freshwater Snail ◽  
Local Government Area ◽  
Freshwater Snails ◽  
Snail Species ◽  
Biomphalaria Pfeifferi ◽  
Factors Affecting ◽  
Water Ph ◽  
Bulinus Globosus

A survey was carried out in Vandeikya Local Government Area of Benue State, Nigeria from April-July 2017 to determine availability of freshwater snails of and their preferred habitats. A total of 289 fresh water snails of four different genera were collected across 27 streams in the 7 districts in Vandeikya LGA. Water pH, water temperature and water velocity were also measured. Lenistislibycuswas found to be the most abundant freshwater snail species accounting for 40.83% of the total freshwater snails. Melanoidestuberculata was the second most abundant accounting for 29.411% of the total snails population sampled, Biomphalaria pfeifferi accounted for 17.99% while Bulinus globosus was significantly lower in abundance than the other snails, accounting for only 11.77%. By location, Mbaduku district had highest abundance of snails 84 (29.1%). The effect of the nature of the substratum on the availability of freshwater snails revealed that habitats with rocky substratum favoured the presence of snails accounting for 181(62.7%) freshwater snail collected.Our understanding of factors affecting the availability and abundance of freshwater snails in nature can prove useful in snail control which is integral for the control of the diseases for which they serve as intermediate host.

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