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Photo#1159879
Gall found on the ground - Andricus quercuscalifornicus

Gall found on the ground - Andricus quercuscalifornicus
Trail in Stanford University Campus, Palo Alto County, California, USA
October 25, 2015
Size: > 6 cm across
This gall was in the vicinity of an oak tree which had many galls, scale in the background is in mm. Some of which were even black. I presume that it was a Valley Oak (Quercus lobata), common in the area. It had at least 3 emergence holes already. The curious thing was that, sometimes, out of an emergence hole a very fetching black critter would poke its had up for a bit. See

Images of this individual: tag all
Gall found on the ground - Andricus quercuscalifornicus Gall found on the ground - Andricus quercuscalifornicus - female Dorsal view - Andricus quercuscalifornicus - female Larva found inside a gall - Andricus quercuscalifornicus Beetle larva found inside a gall - Andricus quercuscalifornicus Wasp removed from its chamber - Andricus quercuscalifornicus - female View of the sectioned gall - Andricus quercuscalifornicus