order exocycloida

Noun
  1. Flat sea urchins (synset 102322075)
    is a type of: animal order - the order of animals
    member holonym: sand dollar - flattened disklike sea urchins that live on sandy bottoms
    belongs to: class echinoidea, echinoidea - sea urchins and sand dollars
    same as: exocycloida

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