The study of the placement of setae on the fly is called : Chaetotaxy.
Arrangement of bristles or macrochaetae on an arthropod or annelid, or taxonomy based on the position and size is called chaetotaxy.
The chaetotaxy of a fly include :- acrostichal, dorsocentral, humeral, mesopleural, scutellar bristles on the thorax; dorsal, anteroventral bristles on the legs and ocellar, orbital,outer vertical and inner vertical bristles on the head.
Flies belong to the order Diptera and they have two, membranous forewings and vestigial hind wings that are reduced to knobs called halteres that helps the insect in balancing. They have mouthparts that can be adapted for piercing, lapping or sponging.
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