Bythiospeum pellucidum 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Littorinimorpha Hydrobiidae

Scientific Name: Bythiospeum pellucidum (Seckendorf, 1846)
Taxonomic Notes: Glöer and Zettler (2005) noted that in Germany nearly 70 different "species" were originally described, which were reduced by Bolling (1965) to three 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 and 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: Critically Endangered B1ab(iii) ver 3.1
Year Published: 2011
Date Assessed: 2010-02-04
Assessor(s): Falkner, G.
Reviewer(s): Seddon, M.B., von Proschwitz, T. & Nichols, C.
The status of this species could be listed as Data Deficient (DD), given that taxonomic reviews are under way for this species group, however the species is listed on a precautionary basis to protect the species and its habitat pending these results. The species was considered as category 1 in Germany (Falkner and Niederhöfer 2008). Since it occurs in only one location, within a groundwater system that is threatened by pollution or over-abstraction of water, it is here listed as Critically Endangered (CR B1ab(iii)).

Geographic Range [top]

Range Description:This species is endemic to Germany, where it is known from the type locality, alluvial gravels of Necker River in Stuttgart Bad-Cannstatt.
Countries occurrence:
Additional data:
Number of Locations:1
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 Niederhöfer (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 interstitial waters.
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

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

Threats [top]

Major Threat(s): The main threats to this species come from groundwater pollution (nitrates from agricultural sources) and over-abstraction of groundwaters (for domestic supply).

Conservation Actions [top]

Conservation Actions: Falkner and Niederhöfer (2008) considered this to be a category 1 species in Germany and noted that it was an extremely rare species with a geographical restriction. 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 pellucidum. The IUCN Red List of Threatened Species 2011: e.T155957A4874034. . Downloaded on 24 March 2018.
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