Heleobia
Heleobia is a genus of small freshwater and brackish water snails with a gill and an operculum , aquatic gastropod mollusks in the family Cochliopidae and the superfamily Truncatelloidea . 
<triplet> snail <subj> gastropod <obj> subclass of <triplet> Cochliopidae <subj> Truncatelloidea <obj> parent taxon