All but the most basal forms exhibit this wing coupling.
2.
The dark colour of its wings coupled with its large surface area acts as a black body, and absorbs the electromagnetic energy from the sun's rays.
3.
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 ".
4.
The jugum on the forewings of the adult is an archaic wing coupling mechanism; further primitive characteristics include, as adults, the lack of mouthparts, large spacing between the fore-and hindwings, and the arrangement of the female genitalia.
5.
It is less widely realised that similar hamuli, though usually fewer, are used in wing coupling in the Sternorrhyncha, the vestige of the rear wing to persist is a futile little strap holding the hamuli, still hooking into the fold of the large front wings.
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