[Kingdom] Animalia Linnaeus, 1758 - animals Grade Enterozoa Grade Cœlomata Phylum Echinoderma Branch Ambulacrata Class Asteroidea Blainville, 1830 - sea stars Grade Ophiuræ Order Phytastra 1 Genus Euryale Lamarck, 1816 2 Genus Saccocoma Agassiz, 1836