Phylum Euarthropoda Lankester, 1904 see [unranked] Euarthropoda Subphylum †Artiopoda Hou & Bergström, 1997 Superclass †Trilobitomorpha Størmer, 1944 Class †Nektaspida Raymond, 1920 Subclass †Petalopleura Hou & Bergström, 1997 1 Genus †Cindarella Chen et al., 1996 2 Genus †Xandarella Hou et al., 1991