living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Echinodermata Bruguière, 1789 - echinoderms
           Subphylum Crinozoa Matsumoto, 1929 see Infraphylum Crinozoa Matsumoto, 1929
             Class Crinoidea Miller, 1821 - sea lilies and feather stars
               Subclass Articulata Miller, 1821
                 Order Millericrinida Sieverts-Doreck, 1953
                   Family Hyocrinidae
                     1 Genus Hyocrinus Thomson, 1876
                     2 Genus Anachalypsicrinus Clark, 1973
                     3 Genus Calamocrinus Agassiz, 1890
                     4 Genus Gephyrocrinus Koehler & Bather, 1902
                     5 Genus Ptilocrinus
                     6 Genus Thalassocrinus