Engel, Michael S. Division of Entomology, University of Kansas, Lawrence, Kansas.
Krombein, Karl V. Department of Entomology, National Museum of Natural History, Smithsonian Institution, Washington, DC.
- Immature forms
- Life history
- Ecology and economic importance
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The second or third largest order of insects, consisting of the sawflies, wood wasps, ants, bees, true wasps, and related forms. Worldwide, there are 91 families and over 150,000 described species of the order Hymenoptera. However, conservative estimates suggest that the global fauna may comprise more than 350,000 species, with many tens of thousands still to be discovered and documented, particularly in the superfamily Ichneumonoidea. Species range in size from truly minute [less than 5 mm (0.2 in.) in length] to large and robust [more than 65 mm (2.6 in.)]. The table presents the higher classification of the order worldwide. The approximate number of species is noted for each family, and common names, where available, are given. See also: Insecta
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