Jewell's Wanderings Daycamp Field Trip Elementary Visits Echinodermata by Lindsey Carlson Charactistics of Echinodermata Endoskeleton composed of calcium plates which may include protuding spines. The lava have bilaterally symmetry and the adults have pentameral symmety. Pentameral meaning 5 radii.
Tube feet are small movable protrusions that allow the animal to move, eat, and breath.
They do not have a circulatory, respiratory or excretory system.