Echinoidea

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Echinoidea [1]

(n. pl.) The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid.

References

  1. ↑ Echinoidea from Webster's Dictionary
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