This chapter focuses on the morphology of adult and larval moths. The adult body framework consists of a hardened exoskeleton made up of a head, thorax, and abdomen. The head of an adult moth contains large compound eyes on the sides, antennae between them, and the mouthparts below, while the head of the larva is a round flattened structure characterized with lobes, bearing an ellipse of six simple eyes. The thorax of adult moths has three fused segments (pro-, meso-, and methathorax), each segment with legs and two pairs of wings in the middle and third segments. The thorax of larval moths is three-segmented with well-developed segmented true legs. The adult abdomen has 10 segments and segments 8 through 10 or 9 and 10 usually greatly modified to form external parts of the genitalia. In larval moths, the abdomen has 10 segments, with leglike organs on all segments.
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