Bithynia tentaculata
Bithynia tentaculata , common names the mud bithynia or common bithynia , or faucet snail is a relatively small species of freshwater snail with gills and an operculum , an aquatic prosobranch gastropod mollusk in the family Bithyniidae . 
<triplet> prosobranch <subj> gastropod <obj> parent taxon <triplet> gastropod <subj> mollusk <obj> parent taxon