Planorbis

noun
Pla·​nor·​bis | \ plə-ˈnȯr-bəs How to pronounce Planorbis (audio) \

Medical Definition of Planorbis

: 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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one from the Upper Peninsula of Michigan

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