Echinoid

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Definition of Eninoidea:
class of echinoderms, commonly called sea urchins, having a typically globular body with skeletal plates fitting together to form a rigid test.[1]
This is the common definition for Eninoidea, other definitions can be discussed in the article

References

  1. Lawrence, E. (2005). Henderson’s dictionary of biology. Pearson Education Limited, 13th ed., Harlow. 748 p.