Wing coupling
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Some four-winged insect orders, such as the Lepidoptera, have developed a wide variety of morphological wing coupling mechanisms in the imago which render these taxa as "functionally dipterous" (effectively two-winged) for efficient insect flight.[1] All but the most basal forms exhibit this wing coupling.[2]:ā4266ā
The mechanisms are of three different types - jugal, frenulo-retinacular and amplexiform.[3]