Download Freshwater Snails Of Africa And Their Medical Importance by David S Brown PDF

By David S Brown

The 1st 1/2 this e-book is basically a scientific survey of the snails, starting with glossaries, keys for identity to genera and a list of species. this is often via a synopsis of species, with short notes on ecology, distribution and parasites. Relationships are then defined among snails and schistosomes and with different parasites. The booklet is going directly to reflect on the standards affecting snail populations and attainable tools for inhabitants regulate.

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Among the 8 species recognised here, N. oweniana and N. tiassalensis are comparatively large and there is a distinct group of smaller species with strongly patterned shells (adansoniana, glabrata, kuramoensis). Binder (1957) gave a comparative account of 6 species found in Ivory Coast. Neritina oweniana (Wood, 1828, Nerita). Type locality: Africa. Figs 17a,b. 28 mm (including the ‘wings’). Last whorl expanded enclosing earlier whorls almost completely; lip commonly expanded above and below forming two winglike projections; columellar edge smooth in large shells but toothed in some juveniles; highly varied black markings on a yellowish-brown background.

Central tooth (Fig. 36d) with 2 or 3 pairs of basal denticles. In fresh or brackish water near South African coast; also in E Zaire .................................................... Pomatiopsidae: Tomichia (p. 77) Family BITHYNIIDAE 1 A Neritoid (globose, whorls rapidly increasing, spire low); shell may have pigmented pattern. Operculum nucleus is subspiral. Central tooth without basal denticles. Found only in rivers in Sierra Leone and Guinea. 3 2 A Shell may reach 10 mm high; usually with pigmented patches or bands, or evenly dark.

Manoeli that it could be the same species; examples from Mauritius and Anjouan Island described by Brown (1980b), taxonomic relationships discussed by Starmühlner (1983). HABITAT AND DISTRIBUTION. On rocks in streams up to 120 m altitude in Anjouan (Starmühlner, 1976a). , 1986); Madagascar (Fischer-Piette & Vukadinovic, 1973); Mauritius, Réunion and Seychelles (Starmühlner, 1976b, 1983).

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