Arctium sp., Susteren
Arctium sp., Groeningse Berg: front and rear spiraculum
cephalic skeleton of 3rd instar larva (from Dušek)
Like in all Pegomya‘s the front spiraculum consists of a fan of stalked papillae, and the rear spiraculum has three oval, curved, papillae. For an extensive description of larva and puparium of this species see Dušek (1970a).