Phylum: Echinodermata, its classification and characteristics
exclusively marine. multicellular, system grade of body organization. triploblastic, coelomate and radially symmetrical. free living, free swimming or sedentary. star shaped, oval shaped, globular, or discoidal with distinct oral or aboral surface. literally means spiny skinned animals. body surface is marked by five distinct ambulacral grooves and alternating five interambulacral area. water vascular system, consists … Read more