Glacidorbis 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 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 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

Aquatic animal

An aquatic animal is an animal, either vertebrate or invertebrate, which lives in water for most or all of its life. It may breathe air or extract its oxygen from that dissolved in water through specialised organs called gills, or directly through its skin. Natural environments and the animals that...

 gastropod molluscs or micromolluscs in the family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Glacidorbidae

Glacidorbidae

The Glacidorbidae is a taxonomic family of freshwater snails, gastropod mollusks in the clade Panpulmonata.- 2005 taxonomy :Glacidorbidae is the only family in the superfamily Glacidorboidea. Glacidorboidea has been classified within the informal group Lower Heterobranchia in the taxonomy of...

.

This genus has proved to be somewhat enigmatic in terms of where it belongs within the taxonomy of the gastropods. It was previously thought to belong in the family 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 :...

 or even in the Basommatophora

Basommatophora

Basommatophora was a term that was previously used as a taxonomic informal group, a group of snails within the informal group Pulmonata, the air-breathing slugs and snails...

.

Species

Species within the genus Glacidorbis include:

• Glacidorbis atrophus Ponder & Avern, 2000
• Glacidorbis bicarinatus Ponder & Avern, 2000
• Glacidorbis catomus Ponder & Avern, 2000
• Glacidorbis circulus Ponder & Avern, 2000
• Glacidorbis costatus Ponder & Avern, 2000
• Glacidorbis decoratus Ponder & Avern, 2000
• Glacidorbis hedleyi
  Glacidorbis hedleyi
  Glacidorbis hedleyi is a species of minute freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Glacidorbidae.Glacidorbis hedleyi is the type species of the genus Glacidorbis....
  
  Iredale, 1943 — the type species
• Glacidorbis isolatus Ponder & Avern, 2000
• Glacidorbis occidentalis
  Glacidorbis occidentalis
  Glacidorbis occidentalis is a species of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Glacidorbidae. This species is endemic to Australia.This species was previously placed within the Hydrobiidae....
  
  Bunn & Stoddart, 1983
• Glacidorbis otwayensis Ponder & Avern, 2000
• Glacidorbis rusticus Ponder & Avern, 2000
• Glacidorbis tasmanicus Ponder & Avern, 2000
• Glacidorbis troglodytes Ponder & Avern, 2000

Transferred to other taxa:

• Glacidorbis pawpela Smith, 1979 is a synonym for Benthodorbis pawpela
• Glacidorbis pedderi (Smith, 1973) is a synonym for Striadorbis pedderi
• Glacidorbis magallanicus Meier-Brook et Smith, 1976 is a synomym for Gondwanorbis magallanicus (Meier-Brook et Smith, 1976)