Английская Википедия:Ambulacrum (anatomy)
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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.
References
Шаблон:Echinoderm-anatomy-stub