Phreatodrobia

Phreatodrobia is a genus of very small or minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Lithoglyphidae.

The generic name Phreatodrobia is derived from the Greek word "phreatos" which means ground water, as in phreatic, and from the suffix -drobia based on family name Hydrobiidae (where it was originally classified), which means "living in water".