ambulacral ridge
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Ambulacral — is a term typically used in the context of anatomical parts of the phylum Echinodermata or class Asteroidea. Echinoderms can have ambulacral parts that include ossicles, plates, spines, and suckers. For example, sea stars or star fish have an… … Wikipedia
Water vascular system — The water vascular system is a hydraulic system used by echinoderms, such as starfish and sea urchins, for locomotion, food and waste transportation, and respirationcite book | first = Eldra | last = Solomon| coauthors = Linda Berg, Diana Martin… … Wikipedia
