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Demospongea
Demospongea (Demospongiae; phylum Porifera) A class of sponges that first appears in the Cambrian. The soft tissue of the skeleton is supported by siliceous spicules, each spicule consisting of either a single ray (monaxon) or four rays (tetraxon) diverging at 60° or 120°. Most fossil species are represented by their spicules only, but they can usually be referred to modern families.
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Cite this article
AILSA ALLABY and MICHAEL ALLABY. "Demospongea." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "Demospongea." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-Demospongea.html AILSA ALLABY and MICHAEL ALLABY. "Demospongea." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Demospongea.html |
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Demospongea
Demospongea See DEMOSPONGIAE.
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Cite this article
MICHAEL ALLABY. "Demospongea." A Dictionary of Zoology. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "Demospongea." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O8-Demospongea.html MICHAEL ALLABY. "Demospongea." A Dictionary of Zoology. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Demospongea.html |
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