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HYMENOPTERA, Xyeloidea

The Xyeloidea are a small superfamily within the Symphyta, with fewer than 2010 extant species, but with an extensive fossil record. They have been considered to be the oldest group within the Hymenoptera. Most species occur in the boreal regions of the Northern Hemisphere.

References: <biology.ref.htm>, [Additional references may be found at: MELVYL Library ]