IUCN threat status:

Critically Endangered (CR)

Distribution

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Range Description

This species is endemic to Austria. Specifically it is known from the northern limestone Alps in the Upper Austrian province. It is restricted to a single spring in the Kirchbichlbach area, south of Weyer (Haase 1993). The estimated area of occupancy (AOO) is less than 4 km for the extant subpopulation, based on the buffer zone around the spring. It wasfound only at a single spring measuring around 1 m, although there were several springs in the immediate vicinity on the same slope (M. Haase pers. comm. 2009). At all the other springs in this area, another species, B. austriaca, was recorded while B. ganslmayri was absent.Museum samples with empty deadshells of this species are known from the wider area around this site, including floodline debris from the Gaflenz River, although there are no data to confirm that these populations are still extant. Haase (1993) notes that it is possible this species would be found at other springs.

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Source: IUCN

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