Members of this phylum contain a network of birefringent calcium carbonate crystals along its skeleton, and the structure of the ossicles in it is called the stereom. The madreporite is a perforated plate which is connected to the stone canal in the water vascular system of these organisms, which usually move using five rows of tubed feet. This phylum includes classes like
Members of this phylum contain a network of birefringent calcium carbonate crystals along its skeleton, and the structure of the ossicles in it is called the stereom. The madreporite is a perforated plate which is connected to the stone canal in the water vascular system of these organisms, which usually move using five rows of tubed feet. This phylum includes classes like Asteroidia and Holothuroidea, and all members exhibit radial symmetry. For 10 points, identify this phylum, whose name means "spiny skinned" and is exemplified by sea urchins and starfish.
Members of this phylum contain a network of birefringent calcium carbonate crystals along its skeleton, and the structure of the ossicles in it is called the stereom.
echinodermata