| A | B |
|---|
| endoskeleton | internal skeleton (on the inside) |
| radial symmetry | adult echinoderms have this type of symmetry |
| bilateral symmetry | echinoderm larvae have this type of symmetry |
| water vascular system | series of canals filled with fluid |
| sea lilies and sea feathers | echinoderm with hundreds of arms |
| brittle stars and basket stars | echinoderm with long, slim arms |
| sea cucumbers | worm-like shaped echinoderm |
| sea urchins and sand dollars | echinoderms with shell-like endoskeleton |
| radial nerve | controls the movement of a sea star's arm |
