Chitons are a primitive class of marine mollusks living worldwide. The chitons, also called sea cradles, have a dorsal shell consisting of eight plates (valves). The plates provide flexibility to move across uneven surfaces, as well as robust protection. Chitons displays a powerful adhesion to the surface and is not easily removed by potential predators. Chitons prefer rocky locations.
There are two orders of chitons. All the common shallow water chitons in Norway belong to the order Chitonida.