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Bythiospeum helveticum 

Scope: Global & Europe
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Littorinimorpha Hydrobiidae

Scientific Name: Bythiospeum helveticum (Clessin, 1882)
Taxonomic Notes: Falkner and Niederhof (2008) discuss the problems with the taxonomy of the species and various issues with the nomenclature on the taxon. For example, Turner et al. (1998: 79) put Bythiospeum helveticum (Clessin 1882) in the synonymy of Bythiospeum diaphanum sterkianum (Clessin 1882).

Assessment Information [top]

Red List Category & Criteria: Vulnerable D2 ver 3.1
Year Published: 2011
Date Assessed: 2010-03-04
Assessor(s): Falkner, G.
Reviewer(s): Seddon, M.B., von Proschwitz, T. & Cuttelod, A.
Justification:
The status of this species could be listed as Data Deficient, given that taxonomic reviews are under way for this species group. However, given the two location, within a groundwater system that is possibly threatened by pollution or over-abstraction of water, the species is listed as Vulnerable (VU) D2, on a precautionary basis to protect the species and its habitat pending the results of the taxonomic review. The species was considered as Category Rare by Falkner and Niederhof (2008).

The species has also been assessed at the regional level as:
European regional assessment: Vulnerable (VU) D2
EU27 regional assessment: Vulnerable (VU) D2 at the level of the 27 member States of the European Union

Geographic Range [top]

Range Description:This species is endemic to Germany, where it was described from Waldshut (Rheingenist) and known from a second locality some 60 km away (Falkner and Niederhof 2008).  The presence in Switzerland requires further research, given the taxonomic complexities discussed by Falkner and Niederhof (2008).
Countries occurrence:
Native:
Germany
Additional data:
Estimated area of occupancy (AOO) - km2:40
Number of Locations:2
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There is no population trend data for this species.  It is described as extremely rare by Falkner and Niederhof (2008).
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species is found in groundwater and outflow springs (Falkner and Niederhoefer 2008).
Systems:Freshwater

Use and Trade [top]

Use and Trade: This species is not used.

Threats [top]

Major Threat(s): Main threats lie in groundwater pollution or over-abstraction of groundwaters.

Conservation Actions [top]

Conservation Actions: Falkner and Niederhof (2008) considered the species to be category R, rare, extremely rare species and species with a geographical restriction in Germany. There are no known conservation actions in place for this species, but habitat monitoring is recommended in order to establish potential changes to the populations, as sampling of these populations is difficult.

Citation: Falkner, G. 2011. Bythiospeum helveticum. The IUCN Red List of Threatened Species 2011: e.T155776A4840814. . Downloaded on 22 July 2018.
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