Planorbis

A European and North African genus of freshwater snails (family Planorbidae), including P. p., intermediate host of the sheep and cattle fluke, Paramphistoma cervi. [G. planos, wandering, + L. orbis, circle, ring]

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Pla·nor·bis plə-'nȯr-bəs n a widely distributed genus of snails that is the type genus of the family Planorbidae, comprises snails having secondarily acquired gills and rather flattened spiral shells, and includes several that are intermediate hosts for schistosomes infecting humans

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Pla·nor·bis (plə-norґbis) a genus of snails of the family Planorbidae. Several species act as intermediate hosts for trematodes such as Schistosoma mansoni, Fasciolopsis buski, and species of Echinostoma.