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Callirhytis quercussuttoni
2222_3386 Photo added 2022-02-06

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

Root gall caused by gall wasps. Host is Quercus agrifolia (coast live oak). Here the gall was detached from the tree and sawed in half on November 7 to expose the larval chambers. The gall contained fully developed adults, along with tiny larvae which seemed to be cynipid larvae. It's unclear if the larvae were inducers of the gall or inquilines (guests). I dissected out a few adults. At least 12 more adults emerged on their own from this gall during January 2022.

all photos and text © Joyce Gross