''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 ''Cynips'' is a genus of gall wasps in the tribe Cynipini, the oak gall wasps. One of the best known is the common oak gall wasp (''Cynips quercusfolii''), which induces characteristic spherical galls about two centimeters wide on the undersides ...

''. 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 gal ...

'' (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