Kingdom Animalia Linnaeus, 1758 - animals Phylum Echinodermata Bruguière, 1789 - echinoderms Subphylum Eleutherozoa Bell, 1891 Class Asteroidea Blainville, 1830 - sea stars Order Paxillosida Perrier, 1884 Genus Ctenodiscus Müller & Troschel, 1842 - mud star