Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Echinodermata Bruguière, 1789 - echinoderms
     Subphylum †Blastozoa Sprinkle, 1973 see Infraphylum Blastozoa Sprinkle, 1973
       Class †Blastoidea Say, 1825
         Genus †Deltablastus
         Genus †Drophocrinus
         Genus †Heteroschisma Wachsmuth, 1883
         Genus †Lophoblastus Rowley, 1901
         Genus †Pentremites Sowerby, 1825
         Genus †Placoblastus Fay, 1961
         Genus †Schizoblastus Etheridge & Carpenter, 1882
         Genus †Timoroblastus Wanner, 1924