[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Phylum Echinodermata Bruguière, 1789 - echinoderms
     Class Holothuroidea (de Blainville, 1834) - sea cucumbers
       Order Molpadiida Haeckel, 1896
         Family Eupyrgidae Semper, 1867
           1 Genus Eupyrgus Lütken, 1857
           2 Genus Hedingia Deichmann, 1938