Class arthropoda
In the case of class arthropoda, the hair is a protuberance of the external skeleton of the surfaces of a body. I am shameless and the hair is thin and, unlike the splinter which does not bend, can turn. When there is structure (the cuticles which became extremely thin) to turn to the basal part, there is it, and there is many it when I work as a sense organ with reception region of the stimulation in each part. With the Arachnida, there is structure capturing movement of the hair in the basal part, and there are structure to hear a sound (I receive vibration of the air) and the thing that it is thought. This is called (a butterfly, already).There is a bunch of the needle of peculiar form-shaped structure to an existing parapodium every metamere with the Polychaeta of the Annelida. This is called a bristle. There is not the parapodium with the Oligochaeta, and only a bristle arranges it to every metamere. These are half buried among bodies and can put it in and out depending on a kind and carry out a role of the assistance of the exercise. I am various, in the tip, the form of comb become the characteristic in the classification.