Amphibolips quercuscoelebs
(sexgen)sexgen:The sexual generation (AKA bisexual generation or sexgen) of an oak gall wasp (cynipini) species consists of both male and female wasps, which mate before the females lay eggs which will mature to form the all-female agamic generation.
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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
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Last updated Feb 4, 2026 1:47 PM UTC
On the Cynipidae of the North American Oaks and their Galls
Baron Osten Sacken
(1861)
Cynips quercus coelebs n. sp.
Quercus rubra. Red Oak. Elongated, fusiform, pale green gall, with a pedicel, inserted on the edge of the leaf and being the prolongation of a leaf-vein. Length about an inch.
The pedicel is about 0.15-0.2 long; the gall itself is an elongated, subcylindrical body, tapering on both sides, 0.6 or 0.7 long; its apex is slender, about 0.1 or 0.15 long. I have found three specimens of this gall near Washington, in June; two are inserted on the margin of the leaf, not far from the stalk; the third is on the leaf-stalk itself, but so that on the side of the gall the leaf originates about half an inch above its place of insertion, whereas on the other side the beginning of the leaf corresponds exactly to the place of insertion of the gall-stalk. In all the three cases, the gall is the prolongation of a vein; in the latter case, the vein, in consequence of the growth of the leaf, has become entirely independent of the blade and appears to be growing out of the leaf-stalk.
The inside of these galls is hollow; each contains a brownish, oblong nucleus, kept in position by woody fibers. On the 17th of June I obtained the gall-fly from one of my specimens; on June 28th a parasite from the other; the third was dry when I found it. The gall-fly is a male.
