Bythiospeum geyeri
Bythiospeum geyeri is a species of very small freshwater snails that have an operculum, aquatic gastropod mollusks in the family Hydrobiidae. The specific name geyeri is in honor of German zoologist David Geyer (1855-1932). This species is endemic to Austria. References

Hydrobiidae
Bythiospeum
Endemic fauna of Austria
Gastropods described in 1925
Taxonomy articles created by Polbot