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Genus Polystepha

leaf gall on red oak - Polystepha pilulae Gall on Oak - Polystepha quercifolia Gall on Oak - Polystepha quercifolia Galls (green spots) on fallen black oak leaf  - Polystepha Red Oak galls - Polystepha pilulae Black oak button gall - Polystepha pilulae oak galls - Polystepha pilulae
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Nematocera" (Non-Brachycera))
Infraorder Bibionomorpha (Gnats, Gall Midges, and March Flies)
Superfamily Sciaroidea (Fungus Gnats and Gall Midges)
Family Cecidomyiidae (Gall Midges and Wood Midges)
Subfamily Cecidomyiinae (Gall Midges)
Supertribe Cecidomyiidi
Tribe Asphondyliini
Genus Polystepha
Range
Eastern North America.
Remarks
Larvae develop in one-celled spot or blister galls on red and black oaks. Galls are evident in late summer or early fall. Most larvae break out of the galls in autumn, but some stay inside the fallen leaves through the winter. (1)
Works Cited
1.The Plant-Feeding Gall Midges of North America
Raymond J. Gagné. 1989. Cornell University Press.