Anthozoa

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(left off Cnidarian phylogeny. taxib adiquately linked.)
(Introduction: wording)
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[[Image:Barbouria.jpg|thumb|200px|right|Barbouria sp., Lower Pennsylvanian coral from the Ely Formation, Millard County, Utah]]   
[[Image:Barbouria.jpg|thumb|200px|right|Barbouria sp., Lower Pennsylvanian coral from the Ely Formation, Millard County, Utah]]   
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Anthozoans are unique in their absence of a [[medusa|medusoid]] phase.  Instead, they release [[sperm]] and eggs that form a [[planula]], which attaches to some substrate on which the cnidarian grows. Some anthozoans can also reproduce asexually through [[budding]]. Many, especially coral, reproduce both asexually and sexually.
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Anthozoans are unique in their absence of a [[medusa|medusoid]] phase.  Instead, they release sperm and eggs that form a larval-like planula that attaches to some substrate on which the organism grows. Some anthozoans can also reproduce asexually through [[budding]]. Many, especially coral, reproduce both asexually and sexually.
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The [[polyp]]s are much larger than are found in the other two [[class]]es. The polyp shows [[biradial symmetry]], with the body cavity divided by [[septa]].  
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[[polyp]]s are much larger than those found in the other two [[class]]es, with the body cavity divided radially by partitions known as septa, resulting in a biradial symmetry.  
Some species also harbour [[dinoflagellate]]s called [[zooxanthella]]e, in a [[symbiotic]] relationship; the reef building corals known as [[hermatypic]] corals rely on this symbiotic relationship particularly. The zooxanthellae benefit by using nitrogenous waste and carbon dioxide produced by the host, and the cnidarian gains photosynthetic capability and increased [[calcium carbonate]] production in hermatypic corals.
Some species also harbour [[dinoflagellate]]s called [[zooxanthella]]e, in a [[symbiotic]] relationship; the reef building corals known as [[hermatypic]] corals rely on this symbiotic relationship particularly. The zooxanthellae benefit by using nitrogenous waste and carbon dioxide produced by the host, and the cnidarian gains photosynthetic capability and increased [[calcium carbonate]] production in hermatypic corals.

Revision as of 11:23, 10 September 2013

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