Planorbidae

noun plural

Pla·​nor·​bi·​dae plə-ˈnȯr-bə-ˌdē 

: a family of freshwater pulmonate snails having a single pair of tentacles with an eye at the base of each and gills as well as lungs and including numerous forms important as intermediate hosts of pathogenic trematode worms see planorbis

planorbid

-bəd 

adjective or noun