Euarthropoda †Lamellipedia see Superclass Lamellipedia Hou & Bergström, 1997 †Artiopoda Hou & Bergström, 1997 see Subphylum Artiopoda Hou & Bergström, 1997 †Retifaciida see Order Retifaciida Hou & Bergström, 1997 Genus †Retifacies Hou, Chen & Lu, 1989 †Retifacies abnormalis Hou et al., 1989