Phylum Echinodermata: Common name(s) of organisms that fall under this phylum. Briefly describe the general body plan of organisms that are in this phylum (ex. type of symmetry, endoskeleton, vascular system etc.) State the common name(s) of animals that fall under Class Asteroidea, Class Ophiuroidea, Class Echinoidea, Class Holothuroidea. Also briefly state the general characteristics differentiating each class. One fact about this group that you found interesting.