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Despite this key, however, Linnaeus grouped insects together that shared other affinities. His genus Coccus , containing the scale insects , he placed among the 4-winged Hemiptera, along with aphids and other plant-attacking insects, even though females have no wings, and males have two wings. [ 2 ]
The morphological characteristics which distinguish the order Lepidoptera from other insect orders are: [10]: 246 Head: The head has large compound eyes and, if mouthparts are present, they are almost always a drinking straw-like proboscis. Scales: Scales cover the external surface of the body and appendages.
This break-down process is known as digestion. The main structure of an insect's digestive system is a long-enclosed tube called the alimentary canal (or gut), which runs lengthwise through the body. The alimentary canal directs food in one direction: from the mouth to the anus. The gut is where almost all of insects' digestion takes place.
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The system of venation is simplified but is representative of the Comstock–Needham system, which was conceived in the late nineteenth century to define precisely the terminology of the wing morphology of insects. In Diptera are the wing-veins are costa, subcosta, radial, medial and cubital.
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Insects undergo considerable change in form during the pupal stage, and emerge as adults. Butterflies are well-known for undergoing complete metamorphosis; most insects use this life cycle. Some insects have evolved this system to hypermetamorphosis. Complete metamorphosis is a trait of the most diverse insect group, the Endopterygota. [82]
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