The Megalodontoidea are a small superfamily within the Symphyta, containing some 250 living species restricted to the temperate regions of Eurasia and North America. These hymenopterans share the distinctive feature of a very large, almost prognathous head, which is widest ventrally. A prehistoric family, Xyelydidae, is known from the Jurassic of ...
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http://en.wikipedia.org/wiki/Megalodontoidea
Megalodontoidea is a super-family of insects of the sub-order Symphyta, order Hymenoptera. They have multi-segmented antennae and wings that are yellowish or dark. The larvae feed on vegetable matter.
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http://www.probertencyclopaedia.com/browse/BM.HTM
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