1. A genus of myiasis-producing fleshflies (family Calliphoridae) with medium-sized metallic-colored adults; includes the Old World screw worm, Chrysomyia bezziana (sometimes called Cochliomyia bezziana), which is a primary invader, comparable with Cochliomyia hominivorax, the New World screw worm fly, whereas Chrysomyia megacephala is an Old World equivalent to Cochliomyia macellaria, both being secondary or saprophytic invaders.

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