[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Phylum Echinodermata Bruguière, 1789 - echinoderms
     Class Crinoidea Miller, 1821 - sea lilies and feather stars
       Order Cyrtocrinida Sieverts-Doreck, 1953
         Family Holopodidae Zittel, 1879
           Genus Cyathidium Steenstrup, 1846