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Western Conifer Seed Bug, Leptoglossus occidentalis


Short description of Leptoglossus occidentalis, Western Conifer Seed Bug

The Western Conifer Seed Bug Leptoglossus occidentalis is a large and conspicuous squashbug, reaching a length of 20mm when adult. It is easily distinguished from all other GB coreids by its reddish-brown body, transverse white zigzag line across the centre of its wings and characteristic leaf-like expansions on the hind tibiae.

Description of Leptoglossus occidentalis, Western Conifer Seed Bug status in GB

Recorded widely from much of England and Wales; probably well-established in many parts of GB.

Habitat summary: Leptoglossus occidentalis, Western Conifer Seed Bug

L. occidentalis is associated with coniferous trees during the breeding season, particularly pines.  Adults overwinter under bark, but may also enter buildings.

Overview table

Environment: Terrestrial
Species status: Non-Native
Native range: Northern America
Functional type: Herbivore
Status in England: Non-Native
Location of first record: Weymouth, Dorset (9)
Date of first record: 2008

Distribution map

Map of the UK with areas shaded to show the UK distribution of Western Conifer Seed Bug

GB Distribution from NBN Atlas

Author's name:

Tristan Bantock

Last updated:

October 2nd 2019

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Thin strip of image show tree trunk and bark