Gastropacha quercifolia

{{short description|Species of moth}}

{{Speciesbox

| name = Lappet

| image = Gastropacha quercifolia01.jpg

| image_caption =

| taxon = Gastropacha quercifolia

| authority = (Linnaeus, 1758)

| synonyms = *Phalaena quercifolia Linnaeus, 1758

}}

Gastropacha quercifolia, the lappet, is a moth of the family Lasiocampidae. It is found in Europe and east across the Palearctic to Japan.

Image:Britishentomologyvolume5Plate24.jpg's British Entomology Volume 5]]

The wingspan is 50–90 mm. Meyrick describes it thus - forewings with 9 to termen; red-brown, with purple-bluish gloss, towards costa blackish-mixed, dorsally ferruginous; first, second, and praesubterminal lines blackish-grey, waved, bent near costa; a blackish-grey discal mark; termen waved-dentate. Hindwings as forewings, but lines indistinct, straight, costal area ferruginous, with about six blackish pseudoneuria; 8 connected with cell by long bar. Larva dark grey or brown; whitish dorsal marks on 3 and 4; 2nd and 3rd incisions deep indigo-blue; a prominence on 1 2; a subspiracular series of tubercles and fringe of pale hairs.Meyrick, E., 1895 A Handbook of British Lepidoptera MacMillan, London [https://archive.org/details/handbookofbritis00meyr/page/n7 pdf] {{PD-notice}}

The larvae feed on Crataegus, Prunus spinosa, willow and oak.