Ant Beetle - Thanasimus formicarius

Description

Although the pattern varies, the elytra always has two pale cross bars. The thorax is red. It reaches a length of up to 10mm.

Identification difficulty
Habitat

Feeds on bark beetles and their grubs in various trees, it is therefore often seen on the trunks of trees.

When to see it

Mostly May to August.

Life History

This beetle spends two years in the larval stage. The adults overwinter and disperse in spring to fallen trees to await the arrival of their bark beetle prey. They first bite off the legs of those they catch to stop them running away.

UK Status

The species is fairly widespread in England, but less so in Scotland or Wales.

VC55 Status

Occasional in Leicestershire and Rutland. There were a total of 14 VC55 records for this species up to March 2015.

Leicestershire & Rutland Map

MAP KEY:

Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2025+ | 2020-2024 | pre-2020

UK Map

Species profile

Common names
Ant Beetle
Species group:
Beetles
Kingdom:
Animalia
Order:
Coleoptera
Family:
Cleridae
Records on NatureSpot:
11
First record:
05/08/2009 (Calow, Graham)
Last record:
20/03/2025 (Smith, Peter)

Total records by month

% of records within its species group

10km squares with records

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