Heteroecus pacificus, the beaked spindle gall wasp, is a species of gall wasp in the family Cynipidae. According to Ron Russo's book, Plant Galls of California and the Southwest, the galls appear on canyon live oak and huckleberry oak.

The satin button-billed wasp (Neuroterus numismalis) is a fleece-winged insect from the family of the real bile wasps (Cynipidae). The scientific name of the species was first validly published in 1785 by Fourcroy.

Neuroterus anthracinus is a widely distributed gall wasp that forms chemically induced leaf galls on oak trees. N. anthracinus has both sexual and agamic generations and in consequence forms two distinct galls, the oyster gall and April-bud gall.

With a fascinating life cycle, california jumping gall wasp undergoes a complex transition, beginning as a parasitic larva inside plant tissue. Maturing within unique growths called galls on oak leaves, this creature eventually emerges as a winged adult, equipped to perpetuate its lineage. In its adult form, it displays a metallic sheen and navigates the canopy with precision, contributing to the rich tapestry of the ecosystem through pollination and by providing a food source for predators.

The common spangle gall on the underside of leaves and the currant gall on the male catkins or occasionally the leaves, develop as chemically induced distortions on pedunculate oak (Quercus robur), or sessile oak (Quercus petraea) trees, caused by the cynipid wasp Neuroterus quercusbaccarum which has both agamic and bisexual generations. Previous names or synonyms for this species are Neuroterus baccarum, N. lenticularis, N. malpighii, Cynips lenticularis, C. quercus-baccarum, Spathegaster baccarum, S. varius, S. interruptor.