Chitons Chitons are marine mollusks with an oval body covered dorsally with eight movable plates and ventrally by a large adhesive foot. The radula is used to scrape small animals from the rocks along the seashore. The shell of two parts encloses the body. There is no recognizable head, but there is a large foot specialized for burrowing. Water and suspended food are drawn in, and waste voided, through openings called siphons, by the action of the cilia on the gills.
Scallops can clap their shells together to produce a jet of water that propels the animal forward.
They move by a type of jet propulsion caused by mantle contractions. This phylum includes earthworms, polychaetes, and leeches. The body is bilateral with definite segmentation evidenced on the surface as rings. Their habit of ingesting dirt particles while scavenging for organic matter makes them valuable tillers of the soil. The coelomic chambers in conjunction with the circular muscles, longitudinal muscles, and setae allow the typical earthworm pattern of movement.