The gall's range is computed from the range of all hosts that the gall occurs on. In some cases we have evidence that the gall does not occur across the full range of the hosts and we will remove these places from the range. For undescribed species we will show the expected range based on hosts plus where the galls have been observed.
Our ID Notes may contain important tips necessary for distinguishing this gall
from similar galls and/or important information about the taxonomic status of
this gall inducer.
Created Feb 4, 2026 1:47 PM UTC
•
Last updated Feb 4, 2026 1:47 PM UTC
Biosystematics and morphology of Symphyta. I. Stem-galling Euura of the California region, and a new female genitalic nomenclature
Edward L Smith
(1968)
Euura lasiolepis n. sp.
[Photos of many examples of this gall appear in Figure 35, page 16 of the pdf]
GALL.—Lasiolepoid-type (Fig. 35); thick walled, tortuous; surface smooth, shiny, or corrugated; color yellow-green except purple to red in bright sun; 20-70 mm long X 3-21 mm wide; 1-5 larvae/gall; willow a shrub or small tree usually under 5 m, but to 10 m in wet sites.
Range.—With the willow at least from Monterey County north to Mendocino County, California, and from the coast to the west face of the Sierra Nevada (but see subsequent discussion).
Remarks.—Emergence and oviposition from late February to early June, peaking in early March; coast and valley populations with cocooning from October through February. Locally very abundant on susceptible willow clones along roadside ditches and sloughs, and marshy areas along foothill streams. East of the Sierra Nevada Divide from 1225—1825 m is a black Euura on S. lasiolepis, average saw L:W = 17.5:1, dimensions 1.56 mm X 0.09 mm, body slightly paler and smaller than coastal (black) phase. For status of this, another form on 3". rigida, and sibling species on S. scouleriana, see discussion of speciation in stem-galling Euura.
