In members of this phylum, sclerocytes secrete calcium carbonate to form the ossicles that make up their outer covering.
One class in this phylum traps food in mucus and uses cilia to move it down an ambulacral groove to the mouth. That class is named Crinoidea. In members of this phylum, sclerocytes secrete calcium carbonate to form the ossicles that make up their outer covering. In order to move, members of this phylum use ampullae that squeeze water into tube feet connected to a water vascular system. This phylum, characterized by radial symmetry, contains the classes Holothuroidea and Asteroidea. For 10 points, name this phylum of animals whose name is Greek for "spiny skin" and which includes animals such as sand dollars, sea urchins, and starfish.
One class in this phylum traps food in mucus and uses cilia to move it down an ambulacral groove to the mouth.
echinodermata [or echinoderms]