“…However, the number of studies aimed to better know the malacological fauna in some regions has increased in the last decades (Paraense 1983, Souza 1986, Souza & Lima 1997, Souza et al 1998a,b, Teles 1987, 1989, 1996, Teles et al 1991, Carvalho et al 1989, 1994,b, FNS 1995, 1998, Schlemper Junior et al 1996.…”