The Echinodermata, commonly known as the starfish, are an ancient and successful phylum of invertebrates. the starfish contain unique shapes and beautiful colors and are very unique.The starfish has a 5-rayed symmetry that is mostly radial. The body of a starfish contains approximately more than two cell layers, including tissues and organs. The body cavity itself is the coelem, has a poor circulatory system that is open, possesses a water vascular system so it operates through its tube feet, and reproduces sexually, it feeds off of fine particles in the water, contains no excretory organs, and has a a nervous system that includes a circum-oesophageal ring.
CRINOIDEA
Ophiocistioidea
Astroidea
Echinoiudea
Holothuoidea
Sources: http://www.earthlife.net/inverts/echinodermata.html
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