Phreatodrobia is a genus of very small or minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Lithoglyphidae.Hershler R. & Thompson F. G. (1990). "Antrorbis breweri, a new genus and species of hydrobiid cavesnail (Gastropoda) from Coosa River Basin, northeastern Alabama". Proceedings of the Biological Society of Washington 103(l): 197-204. PDF.
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".
Species Species within the genus Phreatodrobia include: Phreatodrobia conica Hershler & Longley, 1986 Phreatodrobia coronae Hershler, 1987Hershler & Longley (1987). "Phreatodrobia coronae, a New Species of Cave Snail from Southwestern Texas". The Nautilus 101(3): 133-139. Phreatodrobia imitata Hershler & Longley, 1986 - mimic cavesnail Phreatodrobia micra (Pilsbry & Ferriss, 1906) - type species Phreatodrobia nugax (Pilsbry & Ferriss, 1906) Phreatodrobia nugax inclinata Hershler & Longley, 1986 Phreatodrobia plana Hershler & Longley, 1986 Phreatodrobia punctata Hershler & Longley, 1986 Phreatodrobia rotunda Hershler & Longley, 1986
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