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11.12: Echinoderms

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

TermDefinition
echinoderms Invertebrates that are characterized by a spiny endoskeleton, radial symmetry as adults, and a water vascular system; includes sea stars and sand dollars.
ocelli 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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Difficulty Level:
At Grade

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Date Created:
Feb 24, 2012
Last Modified:
Sep 04, 2016
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SCI.BIO.827.L.1