Bulinus senegalensis (Mollusca: Planorbidae) in northern Nigeria.

Surveys in the South Chad Irrigation Project Area have revealed the presence of substantial populations of the important potential snail host for Schistosoma haematobium, Bulinus senegalensis. This is the first confirmed record of this species outside the Senegambian region and the habitats in which it occurs differ from those previously reported. The implications of this finding for the epidemiology of S. haematobium in the Sahel region are discussed.