1) They have bilaterally symmetrical body, elongated in the oral-aboral axis having mouth at or near one end and anusat or near the other end .
2) They have rough body surface.
3) They have endoskeleton reduced to microscopic spicules or plates embeedded in the body wall.
4) They have mouth surrounded by a set of tentacles attached to water vascular system.
5) Their locomotory organ of them are tube feet or podia.
6) They have long ,coiled alimentary canal with cloaca usually with respiratory trees.
7) They have usually sexes separate and gonad single or paired tufts of tubules.
8) They are commonly called sea cucumbers.
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