Gall Wasp
Northern California, USA

photograph © Alex Wild 2005

An oak gall wasp (Cynipidae) on an oak leaf in northern California.  These wasps lay their eggs into living plant tissue and cause bizarre and often beautiful galls to form.

USA CA: Lake Co.  McLaughlin U.C. Reserve.  30.iv.2005  38º51.76'N 122º24.94'W, 600m
Riparian forest, on Quercus sp.

This image is copyrighted by the photographer and cannot be used without permission. To obtain permission to use this image, please email Alex Wild. (alwild (at)  Most of the photographs on are reduced from their original size and compressed for more efficient web transmission.  In some cases, higher quality versions are available.

This image was captured with a Canon EOS D60, with a Canon 65/2.8 MPE 1-5x Macro lens.