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Andricus crystallinus
2222_3283 Photo added 2021-06-27

Andricus crystallinus (Hymenoptera: Cynipidae)
Crystalline Gall Wasp
Sunol Regional Park, Sunol, Alameda County, California
July 26, 2015

Wasp galls on Quercus douglasii (blue oak). Usually the galls are covered with bristly hairs but sometimes the hairs are missing. Possibly the growth of these galls has been altered by inquilines ('guests' in the galls) or parasitoids. Galls just starting to develop (still very small) also don't have hairs.

all photos and text © Joyce Gross