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ambulacrum

A Dictionary of Earth Sciences | 1999 | Copyright

ambulacrum (amb) In Echinodermata, an area of the body surface (covered in most classes by calcitic (see CALCITE) plates), that overlies one of the radial canals of the internal water vascular system, and bears the tube feet. In some echino-derms, e.g. Asteroidea, Blastoidea, and Crinoidea, the ambulacrum is marked by a deep linear depression, the ambulacral groove. Typically, echinoderms have five ambulacral areas, or a multiple of five. See ECHINOIDEA.

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AILSA ALLABY and MICHAEL ALLABY. "ambulacrum." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 10 Feb. 2010 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "ambulacrum." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (February 10, 2010). http://www.encyclopedia.com/doc/1O13-ambulacrum.html

AILSA ALLABY and MICHAEL ALLABY. "ambulacrum." A Dictionary of Earth Sciences. 1999. Retrieved February 10, 2010 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-ambulacrum.html

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Related entries from encyclopedias, dictionaries, and thesauruses

	ambulacrum Book article from: A Dictionary of Earth Sciences ambulacrum (amb) In Echinodermata , an area of the body surface (covered in most...echino-derms, e.g. Asteroidea, Blastoidea , and Crinoidea , the ambulacrum is marked by a deep linear depression, the ambulacral groove. Typically...
	Echinodermata Book article from: The Columbia Encyclopedia, Sixth Edition ...undersurface; in the furrow of the groove is the ambulacral area, or ambulacrum, with holes for the tube feet. The margins of the groove have spines that can close over the ambulacrum. The tip of each arm bears a tube foot that functions as a sensory...
	hydrospire Book article from: A Dictionary of Zoology hydrospire In Blastoidea (a class of pelmatozoans that became extinct in the Lower Permian but are known as fossils), a system of pores and folds to either side of each ambulacrum that may have served to circulate water into and from the coelom , thus allowing gas exchange.
	ambulacral groove Book article from: A Dictionary of Zoology ambulacral groove See AMBULACRUM .
	interambulacrum Book article from: A Dictionary of Earth Sciences interambulacrum ( interamb , adj. interambulacral ) In Echinodermata , that area of the body surface lying between ambulacra. See AMBULACRUM .