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Callirhytis quercussuttoni
2222_3376 Photo added 2022-02-05

Callirhytis quercussuttoni (Hymenoptera: Cynipidae)
Knowland Park, Oakland, Alameda County, California
November 7, 2021

Old stem gall caused by gall wasps on Quercus agrifolia. The wasps have long ago emerged, leaving exit holes. Gall here was sawed in half to expose the larval chambers where the wasp larvae developed and pupated.

all photos and text © Joyce Gross