The triangle (Heterogenea asella) is a species of moth of the family Limacodidae. It is found in most of the Palearctic realm. The wingspan is 15–20 mm.[2] Adults are on wing from the end of May to mid July in one generation per year.


The larvae feed on Acer, Corylus, Fagus 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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