Zoology: Invertebrates

A Dictionary of Earth Sciences A Dictionary of Zoology Further reading

Calcarea

A Dictionary of Earth Sciences | 1999 | | Copyright

Calcarea (Calcispongea; phylum Porifera) A class of sponge, ranging from Cambrian to Recent, in which the skeleton is made entirely of calcareous spicules which are commonly of a tuning-fork shape. The sponges are sometimes associated with reefs in the Jurassic, or they may form widespread sponge beds.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

AILSA ALLABY and MICHAEL ALLABY. "Calcarea." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 13 Feb. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Calcarea." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (February 13, 2012). http://www.encyclopedia.com/doc/1O13-Calcarea.html

AILSA ALLABY and MICHAEL ALLABY. "Calcarea." A Dictionary of Earth Sciences. 1999. Retrieved February 13, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Calcarea.html

Learn more about citation styles

Calcarea

A Dictionary of Zoology | 1999 | | Copyright

Calcarea (Calcispongea; phylum Porifera) A class of marine sponges that have a skeleton of calcareous spicules. Forms displaying leucon structure are common, and sycon and ascon forms also occur. Individuals vary in shape from tube colonies to massive forms. They first appeared in the Cambrian.

Cite this article
Pick a style below, and copy the text for your bibliography.

MLA
Chicago
APA

MICHAEL ALLABY. "Calcarea." A Dictionary of Zoology. 1999. Encyclopedia.com. 13 Feb. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Calcarea." A Dictionary of Zoology. 1999. Encyclopedia.com. (February 13, 2012). http://www.encyclopedia.com/doc/1O8-Calcarea.html

MICHAEL ALLABY. "Calcarea." A Dictionary of Zoology. 1999. Retrieved February 13, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Calcarea.html

Learn more about citation styles

Free newspaper and magazine articles

	Phylogeny and evolution of calcareous sponges (1). Magazine article from: Canadian Journal of Zoology; 2/1/2006
	Metamorphosis of Coeloblastula Performed by Multipotential Larval Flagellated... Magazine article from: The Biological Bulletin; 2/1/2001
	Feeding in a calcareous sponge: particle uptake by pseudopodia. Magazine article from: The Biological Bulletin; 10/1/2006