To adapt they can regenerate any part can grow into a whole new sea star if it has part of the central disk. They have calcareous skin for protection Their microscopic pinchers on skin called pedicellaria to keep skin clean The eyespots at the end of each arm can see light and dark. Water vascular system for locomotion, digestion, gas exchange, movement of fluid throughout body. The tube feet have strong suckers that can pry apart clams and mussels. They also feed on clams by inserting their stomach into the shell, digesting it, then slurping up their stomach and the digestive juices.