Phylum Echinodermata Bruguière, 1789 - echinoderms
   Class †Blastoidea Say, 1825
   Class Concentricycloidea Baker et al., 1986 - sea daisies
   Class Crinoidea Miller, 1821 - sea lilies and feather stars
   Class Echinoidea (Leske, 1778) - sea urchins and sand dollars
   Class †Edrioasteroidea Billings, 1858
   Class †Eocrinoidea Jaekel, 1918
   Class †Helicoplacoidea Durham & Caster, 1963
   Class Holothuroidea (de Blainville, 1834) - sea cucumbers
   Class †Homoiostelea Gill & Caster, 1960
   Class †Homostelea Gill & Caster, 1960
   Class †Ophiocistioidea (Sollas, 1899)
   Class †Paracrinoidea Regnell, 1945
   Class Stelleroidea Lamarck, 1816 see Subphylum Asterozoa von Zittel, 1895
   Class †Stylophora Gill & Caster, 1960 - stylophorans