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Gall Wasp?

Observed: 31st March 2013 By: ophrys
Yorkshire Naturalists' Union
ophrys is knowledgeable about Invertebratesophrys’s earned reputation in Invertebratesophrys’s earned reputation in Invertebratesophrys’s earned reputation in Invertebratesophrys’s earned reputation in Invertebratesophrys’s earned reputation in Invertebrates
wasp e
wasp j
wasp u
wasp w
Description:

Found on a fence post beneath oak trees. ID purely based on location beneath oaks and similarity to web pictures. Any correction welcome.
About 7mm with wings

Identifications
Species interactions

No interactions present.

Species with which Andricus kollari interacts