Hydroporus palustris


3.3 to 4.0 mm. Elongate oval; the elytral outline is smoothly curved from base to apex.Dark elytra with yellow patterning at the front and sides, though this can be variable. Head red at the front. Antennal segments darkened along the apical half.

Identification difficulty
ID guidance

Your specimen should have the following features:

  • 3.3-4mm
  • .dark elytra with yellow patches at the front and sides (though variable)
  • red at the front of the head
  • pronotum with micro-reticulation (x40+)
  • apical segments of antennae darkened
  • pronotal sides diverging to more or less a smooth join with the elytra
  • metasternal process without transverse grooves
Recording advice

Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.


Found in all types of still and slow running freshwater such as ponds and canals.

When to see it

May be encountered in most months of the year.

UK Status

Widespread and common in Britain.

VC55 Status

Quite common in Leicestershire and Rutland.

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map

Species profile

Species group:
Records on NatureSpot:
First record:
02/07/1989 (Derek Lott)
Last record:
21/03/2023 (Nicholls, David)

Total records by month

% of records within its species group

10km squares with records

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