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 Echiura Sedgwick, 1898 - spoon worms, echiurans see Class Echiura
           Order Echiuroinea
             Family Echiuridae
               1 Genus Anelassorhynchus
               2 Genus Arhynchite Sato, 1937
               3 Genus Echiurus Guérin-Ménéville, 1831
               4 Genus Ikedosoma Bock, 1942
               5 Genus Lissomyema
               6 Genus Listriolobus
               7 Genus Ochetostoma Rüppell & Leuckart, 1830 or 1831
               8 Genus Prashadus Stephen & Edmonds, 1972
               9 Genus Thalassema