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Insect morphology
The morphology of insects is the study and description of the form and structure of insects. Terminology is related to that of the morphology of other arthropods. There is a large variation in the modifications that have been made by various taxa to the basic insect body structure. This is a result of the high rate of speciation, short generations, and long lineages of the class of insects. These modifications allow insects to occupy almost every ecological niche, use a staggering variety of food sources, and possess diverse lifestyles. This article describes the basic insect body and some of the major variations that it can take; in the process it defines many of the technical terms used to describe insect bodies.
Insect body sizes range from 0.3 mm in the case of mymarid wasps, parasites on insect eggs, to the 30-cm wingspan of the American owlet moth ''Thysania agrippina'' (family Noctuidae).
Insects are by far the most successful group in the Arthropoda. They differ in significant ways from the other classes of Hexapoda, such as Protura, Collembola, and others, which are now considered by some authorities to be more basal than insects.
== Anatomy summary ==
Insects possess segmented bodies supported by an exoskeleton, a hard-jointed outer covering made mostly of chitin. The segments of the body are organized into three distinctive but interconnected units, or tagmata: a head, a thorax, and an abdomen. The head supports a pair of sensory antennae, a pair of compound eyes, if present, one to three simple eyes (ocelli), and three sets of variously modified appendages that form the mouthparts. The thorax has six segmented legs (one pair each for the prothorax, mesothorax and the metathorax segments making up the thorax) and two or four wings (if present in the species). The abdomen (made up of 11 segments, some of which may be reduced or fused) has most of the digestive, respiratory, excretory and reproductive internal structures. There is considerable variation and many adaptations in the body parts of insects, especially wings, legs, antenna, and mouthparts.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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