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Species Acraspis erinacei - Hedgehog Gall Wasp

white oak leaf gall - Acraspis erinacei Cynipid from Acraspis pezomachoides gall - Acraspis erinacei - female gall on oak - Acraspis erinacei
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)
Tribe Cynipini
Genus Acraspis
Species erinacei (Hedgehog Gall Wasp)
Synonyms and other taxonomic changes
Philonix erinacei Beutenmueller, 1909
Remarks
Forms galls on white oak (Quercus alba). The sexual generation forms galls on the buds, and the agamic generation forms the distinctive "hedgehog" galls (ellipsoid, up to 13 mm in diameter, covered with red hairs, with 3-5 larval cells inside) on leaves. Females emerge from the leaf galls in the fall (October-December) and crawl to the buds to oviposit. The resulting gall is a thin-walled blister on the inner face of a bud scale, appearing as the buds start to open in the spring. (1)
Works Cited
1.Cynipid Galls of the Eastern United States
Lewis H. Weld. 1959. Privately printed in Ann Arbor, Michigan.