Ground Beetles of Ireland

Trechus obtusus

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Trechus obtusus
© Roy Anderson
Trechus obtusus
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(Maps updated 30th November 2009)

Trechus obtusus Erichson, 1837

Description: 3.5-4mm long yellowish-brown ground beetle. Very common in a variety of habitats from gardens to montane peatlands and hill summits.

World Distribution: A European Wide-temperate species (63). Found from south-western Fennoscandia to Spain and Italy, and into north Africa, but overall with a moderately strong western restriction and not recorded farther east than the western Balkans. Introduced widely in North America.

Irish Status: Widely distributed and generally abundant across Ireland and Britain. Particularly common on hill land.

Ecology: Eurytopic and recorded from agricultural land, particularly hedgerows (Asteraki et al., 1995), open woods, marshes, lakeshores and montane peat. It appears rarer in coastal dune systems and some types of agricultural land where it may be replaced by the closely related T. quadristriatus. As far as our experience goes, the species is exclusively brachypterous in Ireland.