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Heart urchins
Temporal range: Lower Cretaceous–recent
Echinocardium cordatum.jpg
Echinocardium cordatum
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Echinoidea
Superorder: Atelostomata
Order: Spatangoida
L. Agassiz, 1840


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. As a result, heart urchins, unlike most other sea urchins, are bilaterally symmetrical, and have a distinct anterior surface. The presence and position of the mouth and anus typically give members of this group the distinct "heart" shape from which they get their name.

Heart urchins have no feeding lantern, and often have petaloids sunk into grooves. They are a relatively diverse order, with a number of varying species.


According to World Register of Marine Species :

See also[edit]


  • Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 981. ISBN 0-03-056747-5. 
  • National History Museum. "Spatangoida". Retrieved 19 Dec 2009.