Assertion: echinoderm's coelom | /r/HasProperty | water vascular system
Facets:
Source sentences:
text: Body radially symmetrical, usually 5-parted around an oral-aboral axis; body wall with calcareous plates, often with external spines; coelom includes water vascular system and external tube feet for locomotion; divided into five classes: Class Crinoidea (sea lilies); Class Asteroidea (starfish); Class Ophiuroidea (brittle stars); Class Echinoidea (sea urchins & sand dollars) and Class Holothuroidea (sea cucumbers).