Ambulacrum (anatomy)

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.

References

    This article is issued from Wikipedia - version of the 2/17/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.