OBJECTIVE:

To carry out a survey about larval trematodes in Biomphalaria spp. snail biodiversity, obtained from natural breeding sites of two municipalities in Maranhão State, eastern Brazilian Legal Amazon.

MATERIALS AND METHODS:

The gastropods were collected bimonthly at three distinct points in São Luís and São Bento, from February 2015 to January 2016. The mollusks obtained were identified by external and internal morphology. The cercariae were fixed, stained and identified using specific taxonomic keys.

RESULTS:

A total of 2,661 molluscs were collected in São Luís and 1,726 in São Bento; and 3.72% (99/2,661) and 4.87% (84/1,726) of planorbids were positive for larval trematodes, respectively. In São Luís, the helminth fauna identified were Clinostomidae (0.41%), Diplostomidae (0.56%), Echinostomatidae (0.90%), Schistosomatidae (0.71%), Spirorchiidae (0.41%), and Strigeidae (0.71%) families; and in São Bento were Echinostomatidae (1.80%), Schistosomatidae (0.75%), Spirorchiidae (1.56%), and Strigeidae (0.75%) ones. Among cercariae in Schistosomatidae family of the both municipalities, only Schistosoma mansoni was reported. In São Luís, Biomphalaria species presented the following infection rates: 1.95% (52/2,661) for Biomphalaria straminea and 1.76% (47/2,661) for Biomphalaria glabrata. In São Bento, these rates were 4.46% (77/1,726) for B. glabrata and 0.40% (7/1,726) for B. straminea.

CONCLUSION:

The identified cercariae, with the exception of S. mansoni, are considered first reports for São Luís; while for São Bento the first report is for the Strigeidae family.

        · resumo em Português | Espanhol     · texto em Português | Espanhol     · Português ( pdf ) | Espanhol ( pdf )