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Urn Gall Wasp (Phylloteras cupella)

The urn gall wasp (Phylloteras cupella) is a Cynipid wasp which induces cup- or urn-shaped galls on a number of white oaks. The galls are quite small (roughly 1.5mm in diameter), and form on the lower leaf surface near the margin. A close inspection will reveal a shiny, slightly grooved surface, covered in a multitude of tiny hairs.


Urn gall wasp (Phylloteras cupella), leaf gall on California scrub oak (Quercus berberidifolia). Focus-stacked for increased depth of field. Stebbins Cold Canyon Reserve, Solano County, California, USA.
GAL0072


Crop of photo GAL0072, revealing the shiny, striated surface, with miniscule hairs. [Please note that some detail will be lost due to compression and various browser settings. Original files are sharper with fewer artifacts.]

Next Gall: Woollybear gall wasp (Atrusca trimaculosa)



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All images copyright Timothy Boomer. All rights reserved worldwide.