Tardigrades, often known as water bears or moss piglets, are an eight-legged segmented micro-animals phylum. Tardigrades have barrel-shaped bodies and four short legs. Tardigrades feed on plant cells, algae, and tiny invertebrates and are common in mosses and lichens. The body is made up of a head, three body segments with two legs each, and a caudal segment with a fourth pair of legs. The legs lack joints, and the feet contain four to eight claws each. The cuticle is composed of chitin and protein and is constantly shed. The first three pairs of legs are directed downward along the sides and serve as the primary means of locomotion, while the fourth pair is directed backward on the trunk's final length and is largely used for substrate grasping. Tardigrades are missing multiple Hox genes as well as a huge intermediate section of the body axis. This refers to the complete thorax and abdomen of insects. Except for the last pair of legs, the entire body is built up of segments that are comparable to the head area in arthropods. A haemocoel makes up the bodily cavity, however the only area where a real coelom can be found is around the gonad. There are no respiratory organs present, however gas exchange can occur throughout the body.