Callirhytis ellipsoida
(agamic)agamic:The agamic (AKA unisexual) generation of an oak gall wasp (cynipini) species consists of only female wasps, which do not mate before laying the eggs which become the male and females of the sexual generation (sexgen).
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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.
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Details unknown. Looks like Weld's handwriting. In NMNH collection.
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.
Gall. — Ellipsoid, 4.5 by 5.5 mm., single or in small clusters on the small roots just below surface of ground under the tree. Surface smooth, brown. Monothalamous with a firm wall less than one-half millimeter thick when mature, exit hole at end 2 mm. in diameter. Immature galls lighter in color, fleshy, translucent white inside.
Habitat. — Type locality, Wilmette, Illinois. Collected also at Evanston and Winnetka, Illinois.
Biology. — The galls probably take two years to develop, the larvae transforming to adults the second autumn but not emerging from the galls until the following spring between April 15 and May 7. They are all females. They oviposit at once in the swelling buds of the same tree, but the alternating sexual generation is unknown.
