Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Echinodermata Bruguière, 1789 - echinoderms
           Class Holothuroidea (de Blainville, 1834) - sea cucumbers
             Order Apoda (Oppel, 1810)
               Suborder Apodida Brandt, 1835
                 1 Family Synaptidae Burmeister, 1837
                 2 Family Chiridotidae Östergren, 1898
                 3 Family Myriotrochidae Théel, 1877