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Thesaurus: spatangoidea

An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side.

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Definitions

  1. n. pl. An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side.
  2. An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side.
  3. An order of irregular sea urchins, usually having a more orless heart-shaped shell with four or five petal-like ambulacra above.The mouth is edentulous and situated anteriorly, on the under side.