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Species Polystepha globosa

Oak Leaf Galls - Polystepha globosa Gall on red oak - Polystepha globosa Gall on red oak - Polystepha globosa Gall on red oak - Polystepha globosa Ubiquitous oak galls - Polystepha globosa Top - Polystepha globosa
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
Species globosa (Polystepha globosa)
Synonyms and other taxonomic changes
Cincticornia globosa Felt
Size
Galls are 1/15" in diameter (~2 mm)
Food
Forms small spherical galls on leaves of black oak (Quercus velutina) and perhaps other red oaks, usually on the underside.
Remarks
This is the only spherical gall found on oaks that is not caused by a cynipid wasp. Goldfinches have been observed opening the galls to feed on the larvae (see blog post here).