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Ambulacrum (anatomy)

In zoology, an ambulacrum is an elongated area of the shell of an echinoderm in which a row of tube feet are arranged.[1][2] It is pluralized as ambulacra. The area on the shell between ambulacra is known as an interambulacrum.

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.

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