1) Family physidae 2) Freshwater snails 3) Mollusk family 
Physidae, common name the bladder snails, is a monophyletic taxonomic family of small air-breathing freshwater snails, aquatic pulmonate gastropod molluscs in the clade Hygrophila. ==Overview== These fresh water snails are present in aquariums and ponds, as well as in wild areas. They are commonly referred to as tadpole snails or pouch snails. The...
[n] - freshwater snails
family Physidae noun freshwater snails