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‘The water vascular system, found in all echinoderms, accommodates the elongated body of the holothurians.’
‘Sea cucumbers are sausage-shaped holothurians that lie on the sandy floor of reef lagoons.’
‘There was significantly greater population density of holothurians when a coral reef was adjacent to the mangroves than a shoreline with coral reef alone or mangroves alone.’
‘In fact, crinoids, holothurians, and ophiuroids rule the floor of the deep oceans at depths below 500 metres.’
‘However, holothurians retain pentameral (five-rayed) symmetry, with five rows of tube feet running from the mouth along the body.’
Origin
Mid 19th century: from the modern Latin genus name Holothuria (from Greek holothourion, denoting a kind of zoophyte) + -an.