''Bythiospeum geyeri'' is a species of very small

freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include ...

snails that have an operculum, aquatic

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusks in the family Hydrobiidae. The

specific name Specific name may refer to: * in Database management systems, a system-assigned name that is unique within a particular database In taxonomy, either of these two meanings, each with its own set of rules: * Specific name (botany), the two-part (bino ...

''geyeri'' is in honor of German zoologist

David Geyer David Geyer (6 November 1855 – 6 November 1932)Eugene V. Coan, Alan R. Kabat & Richard E. Petit, (15 February) 2009. ''2,400 years of malacology, 6th ed.'' 830 pp. + 32 pp. nnex of Collations American Malacological Society: http://www.malacologi ...

(1855-1932). This species is endemic to Austria.

References

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