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Echinoderms

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Echinoderms
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Vocabulary

echinoderm

echinoderm

Invertebrate, such as a sea star or a sand dollar, that is characterized by a spiny endoskeleton, radial symmetry as adults, and a water vascular system.
nerve net

nerve net

Interconnected neurons with no central brain.
radial symmetry

radial symmetry

Symmetry of a body plan in which there are no head or rear ends, so the body can be divided into two identical halves at any point, like a pie.
sea urchin

sea urchin

Echinoderm with a round, soft body enclosed in a shell covered with long spines.
water vascular system

water vascular system

A network of fluid-filled tubes found in echinoderms.

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