Unio crassus
- kingdom: Animalia
- phylum: Mollusca
- class: Bivalvia
- order: Unionida
- family: Unionidae
- genus: Unio
- species: Unio crassus
Sittersdorf
Velden am Wörthersee
Carinthia
Salzburg
Salzburg
Kremsmünster
Upper Austria
Austria
Podivín
South Moravian
Czech Republic
Crailsheim
Laupheim
Renningen
Baden-Württemberg
Bauler
Dauwelshausen
Freckenfeld
Gemünd
Keppeshausen
Langsur
Oberbillig
Rodershausen
Waldhof-Falkenstein
Rheinland-Pfalz
Germany
Wasserbillig
02
Luxembourg
Białowieża
Podlasie
Poland
Şieu-Odorhei
Bistriţa-Năsăud
Romania
Jegenstorf
Steffisburg
Thun
Urtenen
Bern
Saint-Blaise
Neuchâtel
Stein am Rhein
Schaffhausen
Eschenz
Wagenhausen
Thurgau
Switzerland
Borovnica
Svängsta