Andricus confertus

Andricus confertus, the convoluted gall wasp, is a fairly common species of cynipid wasp that produces galls on oak trees in California in North America. This gall, with its pink, brain-like appearance, is actually a cluster of galls.^[1] In summer, parthenogenetic female larvae induce these galls on the underside of valley oak leaves, along the midrib. Adult wasps emerge the following spring.^[1] These adult females are brown with lighter markings, and are 2.5 millimetres (0.098 in) in length.^[2]

Andricus confertus
Castle Rock Regional Recreation Area, Walnut Creek, California, 2013
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Cynipidae
Genus:	Andricus
Species:	A. confertus
Binomial name
Andricus confertus McCracken & Egbert, 1922