[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Echinoderma
         Branch Tentaculata Eschscholtz, 1825
           Class Cystidea
             Order Echinencrina
               1 Genus Sphæronites Hisinger, 1828
               2 Genus Stephanocrinus Conrad, 1842