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ambulacrum

A Dictionary of Zoology | 1999 | | © A Dictionary of Zoology 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

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

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