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Unidentified gall on water oak

Insect Gall Egg Cases A red oak gall Quercus nigra gall SA_G8 2014 2 Oak Galls St. Andrews leaf galls on Quercus nigra SA_G72 2016 2 Sedwick park leaf gall on Quercus rubra maybe D_G34 2017 1 Sedwick park leaf gall on Quercus rubra maybe D_G34 2017 4
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Parasitica" (parasitic Apocrita))
Superfamily Cynipoidea
Family Cynipidae (Gall Wasps)
No Taxon Unidentified gall on water oak
Range
These photos are from North and South Carolina, Texas, Alabama, Georgia, and Florida. The same galls have also been found in Louisiana, per Martin Hauser's comment on this blog post, and Ken Childs has found them in Tennessee.
Season
Galls have been found from September to November.
Remarks
I have looked for these distinctive galls in Felt (1) and Weld (2) several times to no avail. They are around 3/16" to 1/4" in height and are found on the upper surface of water oak leaves. Southeastern galls are understudied, and it may well be that these are caused by an undescribed cynipid species. (Note from Charley Eiseman, 12/5/2009)
Works Cited
1.Plant Galls and Gall Makers
Ephraim Porter Felt. 1940. Comstock Publishing Company, Inc., Ithaca NY.
2.Cynipid Galls of the Eastern United States
Lewis H. Weld. 1959. Privately printed in Ann Arbor, Michigan.