Tube feet are extensible tubular processes bearing suckers and present in rows on the under-surface of echinoderms. Tube feet are connected internally with water vascular system. Each tube foot has an ampulla, a podium and a sucker. Tube feet are sensory structures that take part in adhesion, locomotion, respiration and food capturing. They are locomotory organs of echinoderms like starfish. Jelly fish is a member of phylum-Coelenterata. Scoliodon is a fish and silver fish is an arthropod.