Sea Cucumber

Any of the 1,100 species of marine invertebrates constituting the class Holothuroidea (or Holothurioidea) of the phylum Echinodermata. The soft, cylindrical body, 2 to 200 cm (about 3/4 inch to 6 1/2 feet) long and 1 to 20 cm (0.4–8 inches) thick, usually is a dull, dark colour and often warty, thus resembling a cucumber. The internal skeleton is reduced to numerous distinctively