Heterogenea asella
Encyclopedia
The Triangle is a species of moth
Moth
A moth is an insect closely related to the butterfly, both being of the order Lepidoptera. Moths form the majority of this order; there are thought to be 150,000 to 250,000 different species of moth , with thousands of species yet to be described...

 of the Limacodidae
Limacodidae
Limacodidae or Euclidae is a family of moths in the superfamily Zygaenoidea or the Cossoidea; the placement is in dispute. They are often called slug moths because their caterpillars bear a distinct resemblance to slugs...

 family. It is found in most of the Palearctic ecozone.

The wingspan
Wingspan
The wingspan of an airplane or a bird, is the distance from one wingtip to the other wingtip. For example, the Boeing 777 has a wingspan of about ; and a Wandering Albatross caught in 1965 had a wingspan of , the official record for a living bird.The term wingspan, more technically extent, is...

 is 15-20 mm. Adults are on wing from the end of May to mid July in one generation per year.

The larvae feed on Acer, Corylus, Fagus
Fagus
Fagus may refer to:* Fagus , a god of beech trees in Celtic mythology, especially in Gaul and the Pyrenees.* Fagus, the genus of beeches* Fagus, Missouri, named for the beech* the Fagus Factory, a German architectural landmark of 1913...

and Quercus species. They are grub-like and have very short legs and a retracted head. Larvae can be found from August to May. The last instar larva overwinters in a cocoon resembling a gall.
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