Cidaroida: Difference between revisions
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==References== |
==References== |
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* {{cite book |author= Barnes, Robert D. |year=1982 |title= Invertebrate Zoology |publisher= Holt-Saunders International |location= Philadelphia, PA|page= 980|isbn= 0-03-056747-5}} |
* {{cite book |author= Barnes, Robert D. |year=1982 |title= Invertebrate Zoology |publisher= Holt-Saunders International |location= Philadelphia, PA|page= 980|isbn= 0-03-056747-5}} |
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* {{cite web | last = National History Museum | first = | title = Cidaroida | url = http://www.nhm.ac.uk/research-curation/research/projects/echinoid-directory/taxa/taxon.jsp?id=1857 | accessdate = |
* {{cite web | last = National History Museum | first = | title = Cidaroida | url = http://www.nhm.ac.uk/research-curation/research/projects/echinoid-directory/taxa/taxon.jsp?id=1857 | accessdate = 20 Dec 2009 }} |
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[[Category:Echinoidea]] |
[[Category:Echinoidea]] |
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{{echinoderm-stub}} |
{{echinoderm-stub}} |
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Revision as of 06:31, 22 December 2013
| Cidaroida Temporal range:
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| Order: | Cidaroida Claus, 1880
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Cidaroida is an order of primitive sea urchins, the only living order of the subclass Perischoechinoidea. All other orders of this subclass, which were even more primitive than the living forms, became extinct during the Mesozoic.
Their primary spines are much more widely separated than in other sea urchins, and they have no gills. Other primitive features include relatively simple plates in the test, and the ambulacral plates continuing as a series across the membrane that surrounds the mouth.
References
- Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 980. ISBN 0-03-056747-5.
- National History Museum. "Cidaroida". Retrieved 20 Dec 2009.
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