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Holometabolaa subclass of the class Insecta, containing those insects that have a marked METAMORPHOSIS in which a larval form pupates and gives rise to an adult (imago) with a very different body form from the larva. Examples include DIPTERANS and LEPIDOPTERA.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005