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Species of gastropod From Wikipedia, the free encyclopedia
Planorbarius metidjensis is a freshwater lung snail.[2]
Planorbarius metidjensis | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Superorder: | Hygrophila |
Family: | Planorbidae |
Subfamily: | Planorbinae |
Tribe: | Coretini |
Genus: | Planorbarius |
Species: | P. metidjensis |
Binomial name | |
Planorbarius metidjensis | |
Synonyms | |
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Experiments confirmed it to be a host of the Schistosoma parasites, while the Bulinus truncatus freshwater snail has been known much longer as a carrier of schistosomiasis.[3]
The snail measures 8 mm x 16 to 18 mm. The shell is light yellowish, while the periostracum is brown, reddish or greenish. The body is nearly black with a grey foot and tentacles.[4]
While P. metidjensis has been successfully infected with Schistosoma haematobium in the laboratory, in Morocco, no free-living infected snails have been found during a survey.[5] Likewise, in the laboratory, snail specimens from Portugal and Salamanca were found to be very susceptible to infections by Schistosoma bovis strains gathered from the Salamanca region, but the 1977 study urged a prevalence survey of free-living snails.[6]
In some areas, there are S. haematobium/S. bovis hybrids. P. metidjensis is immune to experimental infection with hybrid parasites collected in Corsica that contain 23% genetical material from S. bovis.[7]
The snail occurs in southwestern Morocco[3] as well as in Algarve (Portugal) and Salamanca (Spain).[6]
In a 2007 study carried out in Morocco, the snail was found in larger altitudes, and not in man-made water bodies like canals and artificial lakes. It tolerated a wide range of electrical conductivities (120 to 3650 microsieverts/cm) and up to 1.1 grams of chlorides per liter. It was often found together with Ancylus fluviatilis river snails.[3]
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