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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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"Demospongea." A Dictionary of Earth Sciences. . Encyclopedia.com. 21 Aug. 2017 <http://www.encyclopedia.com>.

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"Demospongea." A Dictionary of Earth Sciences. . Retrieved August 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/demospongea

Demospongea

Demospongea See DEMOSPONGIAE.

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"Demospongea." A Dictionary of Zoology. . Encyclopedia.com. 21 Aug. 2017 <http://www.encyclopedia.com>.

"Demospongea." A Dictionary of Zoology. . Encyclopedia.com. (August 21, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/demospongea-0

"Demospongea." A Dictionary of Zoology. . Retrieved August 21, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/demospongea-0