Euarthropoda
   †Lamellipedia see Superclass Lamellipedia Hou & Bergström, 1997
     †Artiopoda Hou & Bergström, 1997 see Subphylum Artiopoda Hou & Bergström, 1997
       [†Helmetiida Novozhilov, 1969] see Order Helmetiida Novozhilov, 1969