[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   [metazoans] Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
     Phylum Arthropoda Siebold, 1848 - arthropods
       Class †Trilobita Walch, 1771 - trilobites
         Order †Agnostida Salter, 1864
           01 Genus †Dipharus Clark, 1923
           02 Genus †Eoagnostus Resser & Howell, 1938
           03 Genus †Eodiscus Matthew, 1896
           04 Genus †Guizhoudiscus Zhang, 1978
           05 Genus †Hebediscus Whitehouse, 1936
           06 Genus †Hupeidiscus Lu, Chang, Chien et al., 1974
           07 Genus †Lenadiscus Repina, 1965
           08 Genus †Leptochilodiscus Rasetti, 1966
           09 Genus †Mallagnostus Howell, 1935
           10 Genus †Microdiscus Emmons, 1855
           11 Genus †Neocobboldia Rasetti, 1952
           12 Genus †Neopagetina Pokrovskaya, 1960
           13 Genus †Pagetides Rasetti, 1945
           14 Genus †Pagetiellus Lermontova, 1940
           15 Genus †Serrodiscus Richter & Richter, 1941
           16 Genus †Shivelicus Pokrovskaya, 1959, nom. nud.
           17 Genus †Shizudiscus
           18 Genus †Sinodiscus Lu Chang, Chien, Chu, Lin, Chou, Chien, Zhang & Wu, 1974
           19 Genus †Szechuanaspis Lu Chang, Chien, Chu, Lin, Chou, Chien, Zhang & Wu, 1974
           20 Genus †Triangulaspis Lermontova, 1940
           21 Genus †Triangullina
           22 Genus †Tsunyidiscus Chang, 1966
           23 Genus †Weymouthia Raymond, 1913
           24 Genus †Yukonia Palmer, 1968