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Echinoidea, n.
more info sea urchins and sand dollars
<noun.animal>

Echinoidea class Echinoidea
semantic pointers
member holonym
Echinodermata, phylum Echinodermata
hypernym
class
member meronym
sea urchin Exocycloida, order Exocycloida Spatangoida, order Spatangoida