Riolus subviolaceus
- kingdom: Animalia
- phylum: Arthropoda
- class: Insecta
- order: Coleoptera
- family: Elmidae
- genus: Riolus
- species: Riolus subviolaceus
Gießhübl
Hainfeld
Hinterbrühl
Kirchberg an der Pielach
Lunz am See
Lower Austria
Gösting
Styria
Garsten
Grünburg
Sankt Ulrich bei Steyr
Steyr
Waldneukirchen
Upper Austria
Kennelbach
Vorarlberg
Austria
Dolní Dobrouč
Pardubický
Czech Republic- France
Aachen
Aldenhoven
Bad Münstereifel
Brakel
Dörentrup
Euskirchen
Halle
Höxter
Kall
Marsberg
Neu-Pattern
Niedermerz
Nieheim
Warburg
Zülpich
North Rhine-Westphalia
Germany
Bolzano
Trentino-Alto Adige
Italy
Beaufort
02
Luxembourg
Bela Palanka
Central Serbia
Serbia
Ashbourne
Bakewell
Bishopstoke
Bishopstrow
Bourton on the Water
Brimscombe
Chalford
Chesham
Chilton Foliat
Codicote
Colden Common
Compton
Corsenside
Creswell
Cromford
Eastleigh
Fairford
Farnborough
Gainsborough
Hemel Hempstead
Hungerford
Hythe
Langham
Little Chalfont
Little Eaton
Matlock
Mayfield
Mildenhall
Much Hadham
Newbury
Rickmansworth
Spilsby
Swanmore
Tuxford
Welford
Whitwell
Wickham
Winterbourne
England
Dumfries
Greenock
Locharbriggs
Stevenston
Scotland
United Kingdom
Aix-les-Bains