[Ecdysozoa] Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997, nom. cl. inval. - ecdysozoans see Clade Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997 [Lake, Halanych, Servin & Garey 2020]
   Superphylum Panarthropoda Nielsen, 1995 see [unranked] Panarthropoda Nielsen, 1995
     Arthropoda Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848
       Phylum Euarthropoda Lankester, 1904 see [unranked] Euarthropoda
         Euchelicerata Weygoldt & Paulus, 1979
           1 Genus †Mollisonia Walcott, 1912
           2.1.1 Genus †Dibasterium Briggs, Siveter, Siveter, Sutton, Garwood & Legg, 2012
           2.1.2 Genus †Offacolus Orr, Siveter, Briggs, Siveter & Sutton, 2000
           2.2.1 Genus Limulus Müller, 1785
           2.2.2.1 Genus †Weinbergina Richter & Richter, 1929
           2.2.2.2.1.1 Genus †Megalograptus Miller, 1873
           2.2.2.2.1.2 Genus †Chasmataspis Caster & Brooks, 1956
           2.2.2.2.2.1 Scorpiones Koch, 1837 - scorpions
           2.2.2.2.2.2.1 Pseudoscorpiones De Geer, 1778
           2.2.2.2.2.2.2.1 Opiliones Sundevall, 1833 - harvestmen
           2.2.2.2.2.2.2.2.1 Palpigradi Thorell, 1888 - palpigrades
           2.2.2.2.2.2.2.2.2.1.1 Solifugae Sundevall, 1833
           2.2.2.2.2.2.2.2.2.1.2.1 Acari Leach, 1817 - mites and ticks
           2.2.2.2.2.2.2.2.2.1.2.2 Ricinulei Thorell, 1876 - ricinuleids
           2.2.2.2.2.2.2.2.2.2.1 †Uraraneida Selden & Shear, 2008
           2.2.2.2.2.2.2.2.2.2.2.1 Araneae Clerck, 1757 - spiders
           2.2.2.2.2.2.2.2.2.2.2.2.1.1 Amblypygi Thorell, 1883 - whip spiders
           2.2.2.2.2.2.2.2.2.2.2.2.1.2 Schizomida Petrunkevitch, 1945 - schizomids
           2.2.2.2.2.2.2.2.2.2.2.2.2.1 Thelyphonida Latreille, 1804
           2.2.2.2.2.2.2.2.2.2.2.2.2.2.1 †Trigonotarbida Petrunkevitch, 1949
           2.2.2.2.2.2.2.2.2.2.2.2.2.2.2 †Haptopoda Pocock, 1911