Callirhytis quercussuttoni (Hymenoptera: Cynipidae)
Gouty Stem Gall Wasp
Knowland Park, Oakland, Alameda County, California
November 6, 2021

Image shows a dissected gall with adult wasp visible in larval chamber. There's a second wasp somewhat visible in the foreground. Host is Quercus agrifolia (coast live oak).