CONTRIBUTION A L'INVENTAIRE ET ECOLOGIE DES ESPECES DES MOLLUSQUES DULCICOLES DES PETITS COURS D'EAU DE LWIRO ET SES ENVIRONS, EST DE LA RD CONGO ( CONTRIBUTION TO THE INVENTORY AND ECOLOGY OF FRESHWATER SNAILS OF SMALL STREAMS OF LWIRO AND ITS SURROUNDINGS, EASTERN OF DR CONGO )

A malacological fauna survey was done in the Katana region in South Kivu, Democratic Republic of Congo were intestinal schistosomiasis ( Schistosoma mansoni ) was signaled. Sampling was done in 23 Streams using the technique of Olivier and Scheirderman (1956). About 14 species was collected: Biomphalaria pfeifferi (Krauss, 1948) , Lymnaea natalensis (Krauss, 1948) , B. forskalii ( Ehrenberg, 1931), B. globosus (Morelet, 1866), P. ovata (Olivier, 1804), Tomichia kivuensis (Mandahl-Barth, 1974), Tomichia hendrickxi (Verdcourt, 1950), Lentorbis junodi (Connolly, 1922), Segmentorbis kempi (Preston, 1912), Potadoma ignobilis (Thiele, 1911), Potadoma freethii (Thiele, 1911) , Ferrissia burnupi ( Walker, 1912), Pisidium casernatum (Poli, 1791) and Physa acuta (Brackenbury et Appleton, 1991; Draparnaud, 1805), in which 5 species (Biomphalaria pfeifferi, Bulinus forskalii, Bulinus globosus, Physa acuta and Ferrissia burnupi ) are recognized as intermediate effective or potential host of schistosomiasis ( Schistosoma manasoni and Schistosoma haematobium ). The ecological characteristic of the species in the Katana region are present in this work.