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Callirhytis congregata
2222_1937 Photo added 2009-11-14

Callirhytis congregata (Hymenoptera: Cynipidae)   (Synonym: Andricus congregata)
Sausage Flower Gall Wasp
Knowland Park, Oakland, Alameda County, California
March 26, 2007

On Quercus agrifolia (coast live oak) catkin.

all photos and text © Joyce Gross