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...distributed on the body, protruding through 5 double rows of pores in the ambulacral plates of the test. The water vascular system of echinoid follows the archetypical pattern closely, with a single madreportite opening abnormally, as in the asteroids. A regular urchin has spherical symmetry and irregular urchins (sand dollars) have bilateral symmetry.
The Holthuroidea class or sea cucumbers are modified tube feet which are often feathery tentacles at the anterior end and each the tentacles could be used to capture food. The holothruian digestive system resembles that of the echinoids, except that it is greatly elongated. The water vascular system follows the typical echinoderm pattern, with the ring canal forming a ring about the esophagus. The water vascular system is not directly connected to the outside and the class of holothuroidea is bilaterally symmetric.
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