Echinoderms
Who are they?
A strictly marine group of invertebrates including five major classes (Crinoidea, Asteroidea, Ophiuroidea, Holothuroidea and Echinoidea) with over 6000 species.
Characteristics
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Radially symmetrical
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No head, brain or tail end
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Calcareous skeleton of plates under skin
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Water vascular system
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Tube feet
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Ability to regenerate body parts
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