Octocorallia

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(removed Anthozoa "phylogeny" , goes with Anthozoa only)
(added sections)
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:<u>Systematics</u> <br/>
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:Phylum: [[Cnidaria]] <br/>
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:Class: [[Anthozoa]] <br/>
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:Subclass: '''Octocorallia'''
== Introduction==
== Introduction==
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Octocorallians include a number of diverse forms including not only soft corals but sea fans, sea feathers, sea pens, and organ pipe corals.
Octocorallians include a number of diverse forms including not only soft corals but sea fans, sea feathers, sea pens, and organ pipe corals.
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==General Morphology==
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Polyps are divided into an upper pharynx, or gullet, and a lower gastrovascular cavity, of "stomach". The pharynx is compressed, i.e. narrow and elongate. On one of the two narrow sides is a strongly ciliated band that produces a strong current, known as a siphonoglyph, ir simply sulcus. In older literature the siphonoglyph side was referred to and "ventral''. Now commonly the sulcal side.
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The gastrovasular cavity is divided symmetrically by eight septa or mesentaries that alternate with the eight pinnate tentacles. Polyps are bilaterally radial in symmetry resulting not only from the narrow pharynx but the the fact that the retractor muscles are on the sulcal side of the mesentaries such that the four on one side of the pharynx are a mirror image of those on the other.
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Skeletal material usually consists of calcareous spicules that form in the mesoglea. In some forms the morphology (shape) of the spicules is diagnostic. 
==Classification==
==Classification==
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**[[Telestacea]]
**[[Telestacea]]
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The following is a dendrogram (not really a phylogeny) that incudes the various taxa
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==Dentrogram==
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The following is a dendrogram (not really a phylogeny) that incudes some of the various taxa
  [[Anthozoa|<==]]o ALCYONARIA (= Octocorallia)
  [[Anthozoa|<==]]o ALCYONARIA (= Octocorallia)

Revision as of 16:43, 9 September 2013

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