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Bythiospeum quenstedti

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA MOLLUSCA GASTROPODA LITTORINIMORPHA HYDROBIIDAE

Scientific Name: Bythiospeum quenstedti
Species Authority: (Wiedersheim, 1873)
Taxonomic Notes:

There are currently 4 subspecies listed for this species; quenstedti (Wiedersheim 1873), ara (Geyer, 1905), turbinella (Geyer, 1905) and weinlandi (Geyer, 1904).

Glöer & Zettler (2005) noted that in Germany nearly 70 different "species" were originally described, which were reduced by Bolling (1965) to 3 species, so for some periods there was little recording. In this problematic genus, they continued to list those species and subspecies on CLECOM (Check List of European Continental Mollusca), but noting that as long as we adhere solely to the shells there will be no progress. A revision of this genus is urgently needed and in Stuttgart, research with DNA analysis is ongoing for this problem.

A conservation assessment is made based on data from shell morphology pending the results for full analysis for the group using Falkner & Niederhöfer (2008), however unless there is indicated active specific species survey data, some species listed as or Extinct or Possibly Extinct have been placed into threatened categories.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2013
Date Assessed: 2010-02-04
Assessor(s): Falkner, G.
Reviewer(s): Haase, M., Seddon, M.B., von Proschwitz, T. & Nichols, C.
Justification:
The distribution of this species is under review in Germany and is considered to be one of the few taxa within the genus Bythiospeum that is less problematic (M. Haase pers. comm. 2010). It may be more widespread, as some of the other species are possibly conspecific with the species and as such the range maybe greater than previously believed (M. Haase pers. comm. 2010). The species could be assessed as Vulnerable (based on the more restricted view of the range sensu Falkner and Niederhöfer 2008), Least Concern (based on the belief that it is more conspecific with other taxa) or Data Deficient pending the outcome of the ongoing species review. It is currently placed as Least Concern (LC), as it has four subspecies, some with more than one site.
History:
1996 Vulnerable
1994 Endangered (Groombridge 1994)

Geographic Range [top]

Range Description: The distribution of this species is under review in Germany and is considered to be one of the few taxa within the genus Bythiospeum that is less problematic (M. Haase pers. comm. 2010). It may be more widespread, as some of the other species are possibly conspecific with the species and as such the range maybe greater than previously believed (M. Haase pers. comm. 2010). Falkner and Niederhöfer (2008) regarded this as more restricted, with four subspecies with several locations.
Countries:
Native:
Germany
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The species is widespread and hence believed to be stable.
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: This species is present in interstitial and groundwaters.
Systems: Freshwater

Use and Trade [top]

Use and Trade: There is no use or trade information for this species.

Threats [top]

Major Threat(s): There are localised threats as subterranean habitats are vulnerable to water pollution from domestic (sewage and run-off) or agricultural (nutrient loads, herbicide and pesticides) sources. Decline in habitat following falls in the water table levels maybe another threat if the aquifers are overexploited.

Conservation Actions [top]

Conservation Actions: The taxonomic status and the distributional data require review and this is currently underway. This species is listed as Category 2 (Highly Endangered) in Germany (Falker and Niederhöfer 2008).

Citation: Falkner, G. 2013. Bythiospeum quenstedti. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 21 October 2014.
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