The endoparasites are those which live inside the body of the host. According to the tissue or the place they inhabit the endoparasites may be grouped into various categories. The parasites of the alimentary canal are commonly called as entozoic parasites. The parasites invading the tissues of the host are histozoic and those living in the coelomic cavity, are called as Coelozoic parasites. The intracellular parasites are known as cytozoic parasites.