Critically Endangered
Belgrandiella parreyssii
Belgrandiella parreyssii
Belgrandiella parreyssii is a springsnail in the family Hydrobiidae (order Littorinimorpha), recorded as Critically Endangered.
Appearance
Belgrandiella parreyssi is a small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Range and habitat
This species is endemic to Austria where it is found only in one thermal spring at Bad Voeslau, south of Vienna. Due to man made changes of the habitat the population has been decreasing rapidly since the 1970s.
Pins are Wikidata “endemic to” fields. Orange dots, when present, are GBIF occurrence tiles — survey bias included.
Diet
Springsnails graze biofilm in cold, stable water. A dried spring or a pumped aquifer can remove the only known population.
Snails move on a single foot and feed with a rasping tongue. Island and spring species rarely recolonise once the site is emptied.
In crisis
A springsnail listed from one source is one drought or one borehole away from an empty name.
Belgrandiella parreyssii is Critically Endangered on this catalog because that is the IUCN category stored on Wikidata. Confirm the official criteria and any later count on iucnredlist.org.
Sources
Written for this catalog from the English Wikipedia article on Belgrandiella parreyssii — often a short stub, Wikidata item Q4847528. Family and order context is original field-guide writing about the group, not a copied assessment of this one species. Wikipedia text is CC BY-SA. Not an IUCN assessment. Counts, when quoted, can change — confirm them on the recovery programme and on iucnredlist.org.
