[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 †Ptychopariida Swinnerton, 1915
           01 Genus †Agraulos Hawle & Corda, 1847
           02 Genus †Altitudella Repina, 1974
           03 Genus †Antagmus Resser, 1936
           04 Genus †Atops Emmons, 1844
           05 Genus †Bicella Rasetti, 1955
           06 Genus †Binodaspis Lermontova, 1951
           07 Genus †Chondrastaulina
           08 Genus †Crassifimbra Lochman, 1947
           09 Genus †Eoptychoparia Rasetti, 1955
           10 Genus †Kolbinella Repina, 1960
           11 Genus †Luxella Rasetti, 1955
           12 Genus †Oncchocephalus