Hygrotus parallellogrammus
- kingdom: Animalia
- phylum: Arthropoda
- class: Insecta
- order: Coleoptera
- family: Dytiscidae
- genus: Hygrotus
- species: Hygrotus parallellogrammus
- Klagenfurt am Wörthersee
Carinthia- Neulengbach
Lower Austria
Austria- Leucate
A9
France- Karlskrona
Blekinge- Särö
Halland- Skanör med Falsterbo
Skåne- Skärhamn
Västra Götaland
Sweden- Allhallows
- Barking
- Belvedere
- Bembridge
- Brading
- Brightlingsea
- Burnham on Crouch
- Canvey Island
- Chafford Hundred
- Chigwell
- Cliffe
- Congresbury
- Cooling
- Dartford
- Deal
- East Bergholt
- Eye
- Freshwater
- Gravesend
- Grays
- Hadleigh
- Helpston
- High Halstow
- Highbridge
- Hunstanton
- Hythe
- Ilford
- Ipswich
- Leigh-on-Sea
- Lewes
- Leysdown-on-Sea
- Newborough
- Newhaven
- Newington
- Paull
- Pevensey
- Pitsea
- Pulborough
- Purfleet
- Queenborough
- Rochester
- Saint Osyth
- Sandown
- Seaview
- Sheerness
- Sherborne
- Shipley
- South Benfleet
- Southampton
- Spixworth
- Stanford-le-Hope
- Stoke
- Stone
- Strood
- Tilbury
- Waltham Abbey
- Wandsworth
- Welling
- Yarmouth
- Yatton
England
United Kingdom