Phreatodrobia is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of very small or minute freshwater snail

Freshwater snail

A freshwater snail is one kind of freshwater mollusc, the other kind being freshwater clams and mussels, i.e. freshwater bivalves. Specifically a freshwater snail is a gastropod that lives in a watery non-marine habitat. The majority of freshwater gastropods have a shell, with very few exceptions....

s with a gill

Gill

A gill is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water, afterward excreting carbon dioxide. The gills of some species such as hermit crabs have adapted to allow respiration on land provided they are kept moist...

 and an operculum

Operculum (gastropod)

The operculum, meaning little lid, is a corneous or calcareous anatomical structure which exists in many groups of sea snails and freshwater snails, and also in a few groups of land snails...

, aquatic gastropod mollusks in the family Lithoglyphidae

Lithoglyphidae

Lithoglyphidae is a family of small freshwater snails with gills and an operculum, aquatic gastropod mollusks.This family is in the superfamily Rissooidea and in the clade Littorinimorpha .- Taxonomy :Taylor , Ponder & Warén and Kabat & Hershler considered this taxon as a subfamily...

.

The generic name

Generic name

Generic name may be:*Generic name, name of a biological genus*Generic name, International Nonproprietary Name for a drug*A placeholder name, referring to nobody in particular, such as Joe Bloggs or John Q. Public...

 Phreatodrobia is derived from the Greek

Greek language

Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

 word "phreatos", that means ground water, phreatic

Phreatic

The term phreatic is used in Earth sciences to refer to matters relating to ground water below the water table . The term 'phreatic surface' indicates the location where the pore water pressure is under atmospheric conditions...

 and from suffix -drobia based on family name Hydrobiidae

Hydrobiidae

Hydrobiidae, common name mud snails, is a large cosmopolitan taxonomic family of very small freshwater snails and brackish water snails that have an operculum, aquatic gastropod mollusks in the clade Littorinimorpha.- Distribution :...

 (where is was originally classified), that means "living in water".

Species

Species within the genus Phreatodrobia include:

• Phreatodrobia conica Hershler & Longley, 1986
• Phreatodrobia coronae Hershler, 1987
• Phreatodrobia imitata Hershler & Longley, 1986 - mimic cavesnail
  Mimic cavesnail
  The mimic cavesnail, scientific name Phreatodrobia imitata, is a species of very small or minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Lithoglyphidae.- Distribution:...
  
  
• 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