Fanniidae Fanild Flies

Four species of Fannin have been reported to cause myiasis: little housefly (F. ecmicularis), latrinefly (F. scalaris), F. incisumta, and F. manicata. Adults of these flies look like small, slender house flies. They are drab gray in color and lack black stripes on the thorax. The larvae commonly occur in feces, on rotting fruits or bulbs, and in bird nests. Larvae occasionally occur in older, somewhat dried carrion. The larvae have a characteristic, fringed appearance (Fig. 16.8) that easily distinguishes them from other muscoid maggots. The fringes apparently allow these maggots

FIGURE 16.8 Fannia sp., larva (Fanniidae); ps, posterior spiracle. (Original by E. P. Catts.)

FIGURE 16.9 Typical muscid larva (Muscidae), third instar. as, anterior spiracle; psl, posterior spiracular plate, house fly (Musca domestica); ps2, posterior spiracular plate, false stable fly (Muscina stabulans). (Original by E. P. Catts.)

to float in a near-liquid medium. The life cycle requires about 1 month. Although cases of enteric and urethral myiasis in humans have been documented (James, 1947; Leclercq, 1969), the involvement of Fannia species in myiasis is rare.

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