Phylum Echinodermata Bruguière, 1789 - echinoderms Class Stelleroidea Lamarck, 1816 see Subphylum Asterozoa von Zittel, 1895 Subclass Asteroidea Blainville, 1830 - starfishes see Class Asteroidea Blainville, 1830 Subclass Ophiuroidea Gray, 1840 - brittle stars see Class Ophiuroidea Gray, 1840 Subclass Somasteroidea Spencer, 1951 see Order Platyasterida Spencer, 1951