This is widely distributed bug that is abundant on weedy canal, lakesides and ponds. It is predominantly lowland species occurring below 300 metres. It is often found with other Gerridae including G.lacustris where it tends to prefer somewhat cleaner waters. It is a generalised predator of invertebrates falling onto the water such as moths, flies etc.

There are two generations a year, the first commencing development in April-May, the second in July - August. Egg and larval development together take about 8 weeks: the teeth on the male venter are absent from larvae.

Distribution:

It is well distributed across the county with the lack of distribution in the south being more the result of less recording effort.

Habitat:

Found in a variety of lowland habitats on weedy canals, lakesides and ponds. Also found in acidic habitats and can be found on damp areas a distance from permanent water bodies.

Identification:

This is most easily identified in the male which has 2 distinct teeth on the underside of the 7th abdominal segment. In both sexes the front femur are mainly black with only the basel third pale.