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).
Damp or wet places.
All year round.
Isotomurus unifasciatus is probably widespread in Britain but records are hopelessly mixed with Isotomurus palustris.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015