The Cyclorrhapha is composed of those flies where the adult escapes from the pupal case through a circular opening in the anterior end. These flies are characterized by the possession of three-segmented antennae where the last segmat bears an arista or style. The suborder Cyclorrhapha has historically represented one of three suborders of the Diptera, along with the Nematocera and Brachycera. Recently, it has been proposed that the Brachycera and Cyclorrhapha be combined in an infraorder called the Muscomorpha (Crosskey, 1993).
The Cyclorrhapha contains many adult flies that are free-living and many of the flies that are true parasites of vertebrates as larval stages. Within this group are the filth flies (Muscidae), the flesh flies (Sarcophagidae), the blow flies (Calliphoridae), and the tse-tse (Glossinidae). Some of these flies are parasitic as larvae causing myiasis that my be obligatory or which can be facultative. One last group of these flies, the Cuteribridae, causes significant disease in cats through the migration of the large bot-like larval stage that is usually found in the rodents or lagomorphs.
Crosskey RW. 1993. Introduction to the Diptera. In: Medical Insects and Arachnids. Lane RP, Crosskey RP (eds). Chapman and Hall, Ltd, London, pages 389-428.