- 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. Source: opted
- 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. Source: webster
- 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. Source: adambom
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spatangoidea
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aboveambulacraanteriorlyedentulousheart-shapedirregularmouthorderpetal-likeseashellsidesituatedurchinsless
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