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Sphaeroteras trimaculosum
2222_1503 Photo added 2007-11-01

Sphaeroteras trimaculosum (Hymenoptera: Cynipidae)   (Synonym: Atrusca trimaculosa)
Woollybear Gall Wasp
Cosumnes River Preserve, San Joaquin County, California
October 19, 2007

On Quercus lobata (Valley Oak). Two galls next to each other each have an exit hole.

all photos and text © Joyce Gross