Phylum Schizoramia Bergström, 1976a see Phylum Arthropoda Siebold, 1848 Superclass †Lamellipedia Hou & Bergström, 1997 - lamellipedians Class †Artiopoda Hou & Bergström, 1997 see Subphylum Artiopoda Hou & Bergström, 1997 Subclass †Petalopleura Hou & Bergström, 1997 Order †Xandarellida Chen et al., 1996 1 Family †Xandarellidae H. Xianguang & J. Bergström, 1997 2 Family †Almeniidae H. Xianguang & J. Bergström, 1997