Ambulacrum (anatomy)
Introduction Sea urchin shell, or 'test'. Each white band is the location of a row of tube feet; each pair of white bands is called an ''ambulacrum'' There are five such ambulacra; the penta-radial symmetry reveals a kinship with sea stars.In zoology, an '''ambulacrum''' is an elongated area of the shell of an echinoderm in which a row of tube feet are arranged. It is pluralized as ''ambulacra''. The area on the shell between ambulacra is known as an interambulacrum.
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