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 Aspidochirota see Order Aspidochirotida Brandt, 1835
               Suborder Elasipodida Théel, 1882
                 1 Family Deimatidae Théel, 1882
                 2 Family Laetmogonidae Ekman, 1926
                 3 Family Psychroptidae see Family Psychropotidae Théel, 1882
                 4 Family Elpididae see Family Elpidiidae Théel, 1882