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Fimbriate Gall Wasp (Andricus opertus)

The fimbriate gall wasp (Andricus opertus) is a cynipid species which induces galls on several white oaks. In many cases, the galls are quite tiny - just 3 to 4mm tall including the fringed or fingerlike protuberances which account for the common name. It should be noted, however, that these galls can grow to be much longer when they disrupt the entire leaf.


Fimbriate gall wasp (Andricus opertus), gall on blue oak (Quercus douglasii). Photographed at 3x lifesize and focus-stacked for increased depth of field. Vacaville Open Space, Solano County, California, USA.
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Fimbriate gall wasp (Andricus opertus), spring generation gall on blue oak. Focus-stacked composite photographed at ~2x lifesize. Vacaville Open Space, Solano County, California, USA.
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Fimbriate gall wasp (Andricus opertus), gall on blue oak. Focus-stacked composite. Vacaville Open Space, Solano County, California, USA.
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Fimbriate gall wasp (Andricus opertus), gall shown with standard pencil tip for scale. Vacaville Open Space, Solano County, California, USA.
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Next Gall: Flange gall wasp (undescribed Cynipidae)



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All images copyright Timothy Boomer. All rights reserved worldwide.