''Cynips quercusfolii'' is a

gall wasp Gall wasps, also incorrectly called gallflies, are hymenopterans of the family Cynipidae in the wasp superfamily Cynipoidea. Their common name comes from the galls they induce on plants for larval development. About 1,300 species of this generall ...

species in the genus '' Cynips''. The species is important for the production of commercial nutgall formed on ''

Quercus lusitanica ''Quercus lusitanica'', commonly known as gall oak, Lusitanian oak, or dyer's oak, is a species of oak native to Portugal, Spain (Galicia and western Andalucia) and Morocco. ''Quercus lusitanica'' is the source of commercial nutgalls. These galls ...

'' (the gall oak). Galls are located on the underside of leaves, with the majority of galls being on the second and third veins from the petiole of the leaf. file:Gallen Eikengalwesp (Cynips quercusfolii).jpg, Galls File:Larve Eikengalwesp (Cynips quercusfolii).jpg, Larva

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Cynipidae Gall-inducing insects Wasps described in 1758 Taxa named by Carl Linnaeus {{wasp-stub