Hydrochus elongatus
- kingdom: Animalia
- phylum: Arthropoda
- class: Insecta
- order: Coleoptera
- family: Hydrochidae
- genus: Hydrochus
- species: Hydrochus elongatus
Zurndorf
Burgenland
Biedermannsdorf
Groß-Enzersdorf
Laxenburg
Lower Austria
Wundschuh
Styria
Austria
Sauverny
B9
France
Karlskrona
Blekinge
Leksand
Dalarna
Fjärås kyrkby
Vallda
Halland
Bor
Jönköping
Nybro
Kalmar
Ljunghusen
Lund
Skåne
Djursholm
Stockholm
Sweden
Sankt Margrethen
Saint Gallen
Switzerland
Addlestone
Askern
Botesdale
Bradley
Charvil
Cheam
Chertsey
Claydon
Cliffe
Cooling
Copmanthorpe
Cottenham
Crowle
Deal
East Boldon
Egham
Elstead
Exminster
Gainsborough
Greenford
Harrow
Harrow on the Hill
Highbridge
Histon
Hook
Howden
Ipswich
Malmesbury
Morden
Northolt
Pevensey
Scarborough
South Benfleet
Stalham
Stone
The Boldons
Twyford
Upton
Waltham
Wargrave
Wedmore
West Hallam
Weston-super-Mare
Wigston Magna
England
United Kingdom
Erlensee
Alzingen