The Echinoderm Phylum

On this site, it will be explaining all the aspects of the Echinoderm Phylum. The Echinoderm Phylum consists of about 6,000 living species, which are all marine organisms. The Phylum is divided up to five major classes, Asteroidea, Ophiuroidea, Echinoidea, Holothuroidea, and Crinoidea. Class Asteroidea is the largest containing around 1,700 living species of echinoderms. This site will explain why the Echinoderm Phylum is different from all other phylums. (Biology of Echinoderms)