In this paper, the forth of a series dealing with the survey of freshwater gastropods of the state of Rio de Janeiro, the results of collections carried out in the Sul Fluminense Mesoregion from 2000 to 2002 are presented and revealed the occurrence of 18 species:
Antillorbis nordestensis
;
Biomphalaria glabrata
;
Biomphalaria peregrina
;
Biomphalaria straminea
;
Biomphalaria tenagophila
;
Drepanotrema anatinum
;
Drepanotrema cimex
;
Drepanotrema lucidum
;
Ferrissia
sp.;
Gundlachia ticaga
;
Gundlachia
sp.;
Heleobia
sp.;
Lymnaea columella
;
Melanoides tuberculatus
;
Physa acuta
;
Physa marmorata
;
Pomacea sordida
and
Pomacea
sp. As to the snail hosts of
Schistosoma mansoni
the most frequent species was
B. tenagophila, found in all municipalities surveyed, except Parati. Besides new records the present study extends the distribution of
B. peregrina and
B. straminea in the state. No specimens were found harbouring larval forms of
S. mansoni although different kinds of cercariae had been observed. An account about the current schistosomiasis transmission sites in this Mesoregion is presented as well.
