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Species Callirhytis furva

fuzzy balls on leaf - Callirhytis furva Oak Leaf Gall ID Request - Callirhytis furva gall - Callirhytis furva fuzzy brown gall on pin oak leaf vein - Callirhytis furva Callirhytis furva? - Callirhytis furva cynipid wasp galls - Callirhytis furva cynipid wasp galls - Callirhytis furva Callirhytis furva
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Parasitica" (parasitoid Apocrita))
Superfamily Cynipoidea
Family Cynipidae (Gall Wasps)
Tribe Cynipini
Genus Callirhytis
Species furva (Callirhytis furva)
Explanation of Names
Author: Weld, 1952
Life Cycle
Galls drop from leaves in October; adults emerge in the second or third spring in late March. (1)
Forms galls on leaves of Quercus nigra and Q. paiustris (2); "probably on all the red oaks" (1): "Small cluster of globular galls, 3-4 mm, each covered with short, straight brown hairs, upper side, fall" (1).

Note from Charley Eiseman, 12/6/2009: The images in this section are not identified with 100% certainty, but this species is the closest match I have found for them. See comments under this image for more information.
Works Cited
1.Cynipid Galls of the Eastern United States
Lewis H. Weld. 1959. Privately printed in Ann Arbor, Michigan.
2.Catalog of Hymenoptera in America North of Mexico
Karl V. Krombein, Paul D. Hurd, Jr., David R. Smith, and B. D. Burks. 1979. Smithsonian Institution Press.