Ambulacrum (zoology)

{{Short description|Physiological characteristic of echinoderms}}

File:Zeeegel3.jpg; 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.{{Cite book |url=https://www.worldcat.org/oclc/1228890101 |title=Echinoderms through time |date=2020 |others=Bruno David, A. Guille, Jean-Pierre Feral |isbn=978-1-000-12367-8 |location=Boca Raton |oclc=1228890101}}{{Cite journal |last1=Paul |first1=C. R. C. |last2=Smith |first2=A. B. |title=The Early Radiation and Phylogeny of Echinoderms |date=November 1984 |url=https://onlinelibrary.wiley.com/doi/10.1111/j.1469-185X.1984.tb00411.x |journal=Biological Reviews |language=en |volume=59 |issue=4 |pages=443–481 |doi=10.1111/j.1469-185X.1984.tb00411.x |s2cid=86572427 |issn=1464-7931}} It is pluralized as ambulacra. The area on the shell between ambulacra is known as an interambulacrum.