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Definitions for
"Echinoidea"
Keywords:
urchins
,
clypeastroid
,
spatangoid
,
echinodermata
,
spheroidal
The class Echinodermata which includes the sea urchins. They have a calcareous shell, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid.
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sea urchins and sand dollars
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