Profenusa pygmaea

© Peter Hillman. Taken September 2021.

A fairly distinctive leafmine cause by the larvae of a sawfly from the family Tenthredinidae (common sawflies). I discovered it on English Oak (Quercus robur), in a local wood, South Staffordshire. A widespread species, it mines the leaves of various species of oak (Quercus) creating a large blister or blotch mine on the upper surface – usually with a narrow ‘neck’ where it begins, but without a real initial corridor. Frass in gradually larger grains scattered in the mine. There is only one larva per mine. Pupation takes place outside the mine. It is univoltine (one brood per season) during the summer.

Species identification confirmed and recorded by an expert from iRecord.