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Marine organisms that exhibit five fold radial symmetry and have a water vascular system.

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Invertebrates that are characterized by a spiny endoskeleton, radial symmetry as adults, and a water vascular system; includes sea stars and sand dollars.


Simple eyes that can sense light; characteristic of echinoderms and other invertebrates.

radial symmetry

Symmetry of a body plan in which there is a distinct top and bottom but not distinct head and tail ends, so the body can be divided into two halves like a pie.

tube feet

External projections characteristic of the water vascular system of echinoderms; function in locomotion, feeding and respiration.

water vascular system

A network of canals that extend along each body part; unique feature of echinoderms.

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