
Quercus palustris, Putten, Schovenhorst: larva dorsal …
… and ventral
thorax dorsal …
… and ventral


head dorsal; the spot at left at the rear margin is connected with parasitation by Grypocentrus


the feet (p1, in this case) bear three short spines anteriorly on the coxa, and end in a short curved claw
prolegs are missing (character of Profenusa), but their position still is recognisable in the surface structure of the integument
Quercus petraea, Hungary, Mosonmagyaróvár, 24.v.2018 © László Érsek: larva, dorsal
head and thorax, dorsal
larva, ventral
head and thorax, ventral
prepupa, dorsal
prepupa, ventral
Quercus cerris, Hungary, Budapest, Hűvösvölgy, 4.vii.2018 © László Érsek: larva
same lave, ventral. Note that the spot on the metasternum is missing

Quercus robur, Belgium, Nismes: prepupa
parasitoids
Sawfly larvae are parisitised by Ichneumonidae of the genus Grypocentus. Th curved, cylindrical eggs are anchored to the head or thorax of the victim.
Profenusa pygmaea larva with Grypocentrus spec, egg
dorsal view

Quercus robur, Duin en Kruidberg. This larva has fallen victim to an entomopathogenic fungus, perhaps related with Cordyceps; a sword-like fruiting of c. 5 mm penetrated the epidermis of the mine.
See Lorenz & Kraus (1957a) for a description of the larva.