Encyclopedia : X : XY : XYE (2 articles)

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Xyelidae
The Xyelidae is a small family of sawflies known from fewer than 50 extant species in 5 genera, but with an extensive fossil record; they are the oldest fossil Hymenoptera, dating back to the Triassic, some 200 million years ago. Most species occur in the Northern Hemisphere, especially in boreal ..
Xyeloidea
The Xyeloidea are a small superfamily within the Symphyta, containing fewer than 200 extant species, but with an extensive fossil record. They are sometimes believed to be the oldest group within the Hymenoptera. Most species occur in the Northern Hemisphere, especially in boreal regions. ..

 

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