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sea cucumber is kept in phylum echinodermata.
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Holothuroidea (sea cucumbers) are one of five extant classes that make up the phylum Echinodermata. ... The ambulacral canals are used in their water vascular system which is another characteristic that binds this phylum together. The water vascular system that develops from their middle coelom or hydrocoel.
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Sea cucumber, (class Holothuroidea), any of 1,200 species of marine invertebrates that constitute a class within the phylum Echinodermata. ... Most species have five rows of tube feet extending from mouth to anus. The anal opening is used for both respiration and discharging wastes
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