ermata :• The animal of this phylum have spiny skin .• It have hard covering of endoskeleton which are MADE up of CALCIUM  • These animal body have Radical symmetry , triploblastic and Coelomate .• Vascualr system is PRESENT so it help in capturing of food , locomotion and respiration .• Example – Starfish and sea cucumber etc  Symmetry : 1] Bilateral symmetry : Bilateral symmetry means body divide into two equal parts  2] Radical Symmetry : Radical symmetry means body divide into multiple equal parts  Germ  layers :  1] Diploblastic : Diploblastic means body FORMED from two germs layer .2] Triploblastic : Triploblastic means body formed from three germs layer .Colemate : Colemate means Body cavity present in the body .Acolemate : Acolemate means body cavity absent in the body .  Segmentation : A body which have segment called Segmentation  Skelation :  1] Exoskelation : Exoskelation means hard covering of calcium carbonate present which help to protection of body  2] Endoskelation : Endoskelation means hard covering of Calcium present which help to also protection of body  Chorodata : Chorodata means vertebral column present and Notochord also present  Non- Chorodata : Non – Chorodata means Absent vertebral column and Notochord also absent