Gastropoda
Snails
Mollusca
A phylum of the kingdom Metazoa. Mollusca have soft, unsegmented bodies with an anterior head, a dorsal visceral mass, and a ventral foot. Most are encased in a protective calcareous shell. It includes the classes GASTROPODA; BIVALVIA; CEPHALOPODA; Aplacophora; Scaphopoda; Polyplacophora; and Monoplacophora.
Biomphalaria
A genus of planorbid freshwater snails, species of which are intermediate hosts of Schistosoma mansoni.
Lymnaea
A genus of dextrally coiled freshwater snails that includes some species of importance as intermediate hosts of parasitic flukes.
Nematocyst
Fasciola
RNA, Ribosomal, 18S
Disease Vectors
Brazil
I'm sorry for any confusion, but "Brazil" is not a medical term or concept, it is a country located in South America, known officially as the Federative Republic of Brazil. If you have any questions related to health, medicine, or science, I'd be happy to help answer those!