1) Echinoderm 2) Free-living mud feeders 3) Sea cucumber 1) Trepang 
• (a.) Belonging to the Holothurioidea. • (n.) One of the Holothurioidea.
(from the article `circulation`) The blood-vascular (hemal) system is reduced and consists of small, fluid-filled sinuses that lack a distinct lining. The system is most highly ... ...oceans, mostly in shallow water but sometimes at great depths. They are best represented in the Indian Ocean and the western Pacific. The 80 to ... [2 ...
Hol`o·thu'ri·an adjective (Zoology) Belonging to the Holothurioidea. -- noun One of the Holothurioidea. » Some of the species of Holothurians are called sea cucumbers , sea slugs , trepang , and bêche de mèr . Many are used as food...
any echinoderm of the class Holothuroidea, comprising the sea cucumbers.