| general term for reproductive organs | | |
| Connects to mouth; extruded during feeding | | |
| Connects to anus and digestive glands; stays in during feeding | | |
| Makes bile and absorbs nutrients | | |
| contains radial nerve & radial canal | | |
| Calcium carbonate plates that form the endoskeleton | | |
| Holds tubefeet on aboral side | | |
| Sense light and dark | | |
| Pinchers that keep the surface clear | | |
| Provide protection | | |
| Skin extensions between spines that gas exchange & remove nitrogen waste | | |
| Side with the mouth and ambulacral groove | | |
| Side with the madreporite and anus | | |
| winged larva seen in Echinodermata | | |