However, body shape and other features separate seastars into the class Asteroidea.
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They are readily recognized by their stellate star shaped profiles with five or more tapering arms radiating from the central body, although some species have a more cushion-like pentagonal shape with arms reduced.
Characteristics these animals share include their basic body symmetry, an internal calcareous skeleton and a water vascular system composed of fluid filled canals that are often evident as external tube feet which are used for locomotion.