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Reference.org
Gall wasp
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<p>Gall wasps, also traditionally called gallflies, are <a href="/facts/Hymenoptera/xx7SU0VR">hymenopterans</a> of the family Cynipidae in the wasp superfamily <a href="/facts/Cynipoidea/FvszS4vV">Cynipoidea</a>. Their common name comes from the <a href="/facts/Gall/dd7TT4ke">galls</a> they induce on <a href="/facts/Plant/X5BMDMvS">plants</a> for larval development. About 1,300 species of this generally very small creature (1–8 millimetres or 1⁄32–5⁄16 inch) are known worldwide, with about 360 species of 36 different genera in Europe and some 800 species in North America. </p>