Andricus parmula
Andricus parmula, also known as the disc gall wasp, is a species of gall-forming wasp in the genus Andricus. It induces galls in a wide selection of oak species, especially white oaks, and including hybrids. The galls are disc-shaped, up to 3 mm in diameter, and pale with red streaking. Adult females emerge in April. The galls induced by A. parmula superficially resemble the galls of Andricus gigas, Andricus viscidus, and newly identified species called the "plate gall wasp" and the "orange-cap gall wasp" by Richard Russo. Galls induced by this wasp have been documented in Oregon and California on the Pacific coast of North America. References

External links 
 Andricus parmula on gallformers

Cynipidae
Gall-inducing insects
Oak galls
Hymenoptera of North America
Insects described in 1900
Insects of the United States
Western North American coastal fauna