“…Nearly one -third of these species occur in freshwater ecosystems related to the main drainage river basins in Brazil (Estrada et al,2006;Teodoro,2010),where Biomphalaria glabrata (Say,1818),Biomphalaria tenagophila (Orbigny,1835) and Biomphalaria straminea (Dunker,1848) have serious impact on human health for these species host Schistosoma mansoni Sambon 1907 (Figure 1). Palasio, R.G.S., 2011) showing the worldwide distribution of the 37 Biomphalaria species, the 26 neotropical Biomphalaria species and the 11 species and 1 subspecies naturally described in Brazil (•) (Brasil,Ministério da Saúde 2007;Carvalho et al, 2008;Teodoro et al,2010). An asterisk indicates Schistosoma mansoni host species (Palasio, RGS, 2011).…”