8. SCALES Some insect wings are covered with
scales . The scales make the wings colorful. Examples:
Butterflies, moths and skippers (order Lepidoptera), caddisflies (order Trichoptera).
WING COUPLING Higher
pterygotes have attained virtual dipterism by co ordinate wing movements. Such insects have
devices for hooking fore and hind wings together so both the pairs move synchronously. By
coupling the wings the insects become functionally two winged.
TYPES OF WING COUPLING Insect Morphology and Systematics
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1. Hamulate: A row of small hooks is present on the costal margin of the hindwing which is
known as hamuli. These engage the folded posterior edge of fore wing. Eg: Bees.
