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Bulinus nasutus
Species of gastropod From Wikipedia, the free encyclopedia
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Bulinus nasutus is a species of tropical freshwater snail with a sinistral shell, an aquatic gastropod mollusk in the family Planorbidae, the ramshorn snails and their allies.
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Subspecies
- Bulinus nasutus nasutus
- Bulinus nasutus productus Mandahl-Barth, 1960[3]
Distribution
The distribution of Bulinus nasutus includes three countries in East Africa:
Type locality is Bagamoyo,[4] now in Tanzania.
Description
The width of the shell is 12 mm.[4] The height of the shell is 25 mm.[4]
The diploid chromosome number is 2n = 36.[4]
Ecology
Bulinus nasutus lives in temporary pools, ditches and burrow-pits.[4]
High concentration of chloride (468-2220 ppm Cl) have been found in pools inhabited by Bulinus nasutus in Tanzania.[4]
Bulinus nasutus can aestivate in the dry mud for about 5–8 months.[4] Respiration of Bulinus nasutus during aestivation is probably aerobic.[4] They aestivate on margins of pools, and thus stop aestivation only in optimal conditions, when the pool has much water.[4]
Webbe (1962, 1965)[5][6] described population dynamics of Bulinus nasutus in Tanzania.[4]
Mature snails lay eggs during the whole life span, primarily immediately after the main rainfall.[4] Snails 8 weeks old, whose shell is about 8 mm in height, are mature and can lay eggs.[4] However they require more than 12 months of life and 1-2 aestivation periods in order to reach their full size.[4]
This species is an intermediate host for:
- Schistosoma bovis[4]
- Schistosoma haematobium - it is the main intermediate host of Schistosoma haematobium in northwestern Tanzania[4]
- Echinostome spp.[4]
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References
External links
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