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Description
Starfish or sea stars are marine invertebrates belonging to the kingdom animalia, phylum Echinodermata, class Asteroidea.
Starfish exhibit a superficially radial symmetry. They typically have five or more "arms" which radiate from an indistinct disk (pentaradial symmetry). Starfish do not rely on a jointed, movable skeleton for support and locomotion (though they are protected by their skeleton), but instead possess a hydraulic water vascular system that aids in locomotion. The water vascular system has many projections called tube feet, on the ventral face of the starfish's arms, which function in locomotion and aid with feeding.

Description
Starfish or sea stars are marine invertebrates belonging to the kingdom animalia, phylum Echinodermata, class Asteroidea.
Starfish exhibit a superficially radial symmetry. They typically have five or more "arms" which radiate from an indistinct disk (pentaradial symmetry). Starfish do not rely on a jointed, movable skeleton for support and locomotion (though they are protected by their skeleton), but instead possess a hydraulic water vascular system that aids in locomotion. The water vascular system has many projections called tube feet, on the ventral face of the starfish's arms, which function in locomotion and aid with feeding.