Euarthropoda
   †Lamellipedia see Superclass Lamellipedia Hou & Bergström, 1997
     †Artiopoda Hou & Bergström, 1997 see Subphylum Artiopoda Hou & Bergström, 1997
       1 †Aglaspidida see Subclass Aglaspidida (Walcott, 1911) Bergström, 1968
       2 †Xenopoda see Subclass Xenopoda Raymond, 1935
       2.3.1 †Retifaciida see Order Retifaciida Hou & Bergström, 1997
       2.3.2.1 Genus †Buenaspis Budd, 1999
       2.3.2.2 Genus †Panlongia Liu & Luo, 2006
       2.3.2.3 Genus †Squamacula Hou & Bergström, 1997
       2.3.2.4 †Trilobita Walch, 1771 - trilobites see Class Trilobita Walch, 1771
       2.3.2.5.1 Genus †Phytophilaspis Ivantsov, 1999
       2.3.2.5.2 †Petalopleura Hou & Bergström, 1997 see Subclass Petalopleura Hou & Bergström, 1997
       2.3.2.6.1 Genus †Kwanyinaspis Zhang & Shu, 2005
       2.3.2.6.2 †Conciliterga see Subclass Conciliterga Hou & Bergström, 1997
       2.3.2.7 Order †Nektaspida Raymond, 1920 - nektaspids see Class Nektaspida Raymond, 1920