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Spatangoida

Animal
The heart urchins or Spatangoida are an order of sea urchins. Their body is a somewhat elongated oval in form, and is distinguished by the mouth being placed towards one end of the animal, and the anus towards the other. Wikipedia
Scientific name: Spatangoida
Kingdom: Animalia
Infraclass: Irregularia
Order: Spatangoida; L. Agassiz, 1840
Lower classifications