Organisms in this phylum contain (*) tubefeet, which are part of the water vascular system.
Though organisms in this phylum have a central nerve ring around the gut, no organism in this phylum contains a brain. This phylum's excretory system is linked to the circulatory system, and opens into the environment at the madreporite (MAD-ruh-POR-ite). Organisms in this phylum contain (*) tubefeet, which are part of the water vascular system. This phylum contains the simplest deuterostomes (DOO-ter-oh-STOMEZ). The adults of all members of this phylum are pentaradially symmetrical. For 10 points, name this phylum that contains sea urchins and starfish.
Though organisms in this phylum have a central nerve ring around the gut, no organism in this phylum contains a brain.
{Echinodermata} [or {echinoderms}]