Definition The class insect regroups all Arthropod animals which possess three pairs of legs and a segmented body at adult stage. This segmented body is composed of three main parts which are the abdomen, the thorax and the head. In top of that, adult insects have also usually one pair of wing, sometimes even two.
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HeadThree sets of mouth part :
Each mouthpart of an insect is adapted to a particular way of feeding. Per example, and this will be better detailed in the venom and saliva section, mouthpart can be oriented to pierce and suck preys flesh. Pair of antennae : Used as sensory organs Pair of compound eyes : Can be either lateral or smaller ocelli, acting like simpler eyes. |
ThoraxTwo pairs of wings :
Only develop in adult stage of insects, can be more or less developed according to the specie. Allow better movement Three pairs of legs : Insects possess three pairs of legs , which seems to be the perfect compromise between mobility and stability. |
AbdomenSexual organs
Respiratory spiracles: Located onto the exosqueleton of the insect, these allow air to enter the trachea. They are part of the reasons why insects can't grow massive in size, as air could not reach inner parts. Digestive and excretory organs |