Kinorhynchans are segmented, limbless animals. Their body has a head, neck, and a trunk. The trunk has eleven segments. They do not have external cilia, but have a number of spines along the body, and up to seven circles of spines around the head. These spines are used for movement. They can pull back the head and push forward; then they can grip the substrate with the spines, and draw up the body.