Euura sp. (an unnamed leaf-midrib galling sawfly)

Host: Salix lasiolepis

In northern Arizona, Euura sp. females usually initiate one gall per leaf in the midrib of coyote willow leaves during May. Larvae hatch from eggs and feed inside the gall through June. Larvae then emerge from the galls and fall to the ground, pupate and over-winter. The following April, adults emerge from the ground, mate, and initiate a new generation. In Euura gallers, final gall volume generally results from an interaction of the ovipositing female and the host plant so that galls reach full size before larvae hatch or commence feeding (Smith 1970, and demonstrated by Price and Clancy 1986 for E. lasiolepis).

Range: Colorado River at Lee's Ferry, Arizona, 25 km downstream from Glen Canyon Dam