Ambulacrum (anatomy)
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Zeeegel3.jpg/220px-Zeeegel3.jpg)
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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Categories:
- Echinoderm anatomy
- Echinoderm stubs
- Animal anatomy stubs