This phylum's members have a pair of pouches that split from the archenteron, with each pouch constricting into three portions. Members of this phylum draw in water through madreporites, which are a part of their water vascular system, and they move by utilizing hydrostatic 
This phylum's members have a pair of pouches that split from the archenteron, with each pouch constricting into three portions. Members of this phylum draw in water through madreporites, which are a part of their water vascular system, and they move by utilizing hydrostatic pressure to move five rows of tube feet. Some species in this phylum have their teeth arranged in a structure called "Aristotle's lantern." This phylum includes the classes Holothuroidea and Asteroida, and species in this phylum exhibit radial symmetry. For 10 points, identify this phylum which includes sea urchins and sea star, whose name means "spiny skin" in Greek.
This phylum's members have a pair of pouches that split from the archenteron, with each pouch constricting into three portions.
{Echinoderm}ata