Isotomurus unifasciatus

Description

The distinction between Isotomurus palustris and I. unifasciatus is that I. unifasciatus has a continuous dark line down its midline but is otherwise uniformly pale, while Isotomurus palustris has a slightly discontinuous dorsal line and mottled patterning on the sides of its abdomen. However, it is very difficult to separate these species without microscopic examination, which reveals that Isotomurus palustris has dark pigment on legs and sides of abdomen which extends to the dorsolateral patches (c.f. I. palustris) and that the frontoclypeal area is bluish (c.f. I. graminis). 

Identification difficulty
Habitat

Damp or wet places.

When to see it

All year round.

UK Status

Isotomurus unifasciatus is probably widespread in Britain but records are hopelessly mixed with Isotomurus palustris.  

VC55 Status

Status in Leicestershire and Rutland not known.

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Leicestershire & Rutland Map

MAP KEY:

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

UK Map