''Acraspis villosa'' is a gall-forming wasp from the family

Cynipidae Gall wasps, also incorrectly called gallflies, are hymenopterans of the family Cynipidae in the wasp superfamily Cynipoidea. Their common name comes from the galls they induce on plants for larval development. About 1,300 species of this genera ...

. It can be found in Canada and the US. It forms galls on ''

Quercus macrocarpa ''Quercus macrocarpa'', the bur oak or burr oak, is a species of oak tree native to eastern North America. It is in the white oak section, ''Quercus'' sect. ''Quercus'', and is also called mossycup oak, mossycup white oak, blue oak, or scrub oa ...

''.

References

Cynipidae Gall-inducing insects Insects described in 1888 {{apocrita-stub