The Triangle Heterogenea asella - Distribution map

Please note that the NBN Gateway map service has been terminated as of 1 April 2017.

As soon as a replacement map service is available, distribution maps will hopefully appear here again.

In the meantime, you can get some idea of distribution from the NBN Atlas website.

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53.002 BF174

The Triangle Heterogenea asella

([Denis & Schiffermüller], 1775)

Wingspan 15-20 mm.

This rather small species (around 20mm wingspan), is local and scarce in Britain, only occurring in parts of south-east England.

Inhabiting woodland areas, the recorded larval foodplants are oak (Quercus) and beech (Fagus). However, the species was recently discovered in West Sussex feeding on both horse chestnut (Aesculus hippocastanum) (see photo), and small-leaved lime (Tilia cordata), both of which are previously unrecorded foodplants in Britain.

The strange, grub-like larvae have very short legs and a retracted head.

The adults fly in June and July and are attracted to light.
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