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Callirhytis quercussuttoni
2222_3380 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 twig containing the gall died at some point after the wasps emerged. Here the gall was sawed in half showing the larval chambers where the wasp larva fed and pupated. On very old galls like this one, the holes fill with sawdust, frass from other insects that re-use the space, and other debris. In this image the larval cells have been cleaned out to make the larval cell structure easier to see.

all photos and text © Joyce Gross