Spatangoida
| Heart urchins Temporal range:
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|---|---|
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| Spatangus purpureus | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Subclass: | Euechinoidea |
| Infraclass: | Irregularia |
| Superorder: | Atelostomata |
| Order: | Spatangoida L. Agassiz, 1840 |
| Suborders | |
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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.
Taxonomy[]
According to World Register of Marine Species :
- suborder Stockley, Smith, Littlewood, Lessios & MacKenzie-Dodds, 2005
- family Asterostomatidae Pictet, 1857
- family Brissidae Gray, 1855
- family Palaeotropidae Lambert, 1896
- super-family Fischer, 1966
- family Eupatagidae Lambert, 1905
- family Eurypatagidae Kroh, 2007
- family Loveniidae Lambert, 1905
- family Macropneustidae Lambert, 1905
- family Maretiidae Lambert, 1905
- family Fourtau, 1905 †
- family Spatangidae Gray, 1825
- family Hemiasteridae H. L. Clark, 1917
- suborder Fischer, 1966
- family Aeropsidae Lambert, 1896
- family Micrasteridae Lambert, 1920a
- family Palaeostomatidae Lovén, 1868
- suborder Markov & Solovjev, 2001
- superfamily A. Agassiz, 1904
- family Paleopneustidae A. Agassiz, 1904
- family Pericosmidae Lambert, 1905
- family Prenasteridae Lambert, 1905
- family Schizasteridae Lambert, 1905
- superfamily A. Agassiz, 1904
- family Wagner & Durham, 1966a †
- family Toxasteridae Lambert, 1920a †
sp. (Macropneustidae)
Fossile of (Hemiasteridae)
Fossile de (Micrasteridae)
Fossile d' (Toxasteridae)
See also[]
References[]
- 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.
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- Spatangoida
- Extant Early Cretaceous first appearances
- Echinoidea stubs