[Panarthropoda] Nielsen, 1995 - panarthropods Arthropoda Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848 Chelicerata Heymons, 1901 see Superclass Chelicerata Heymons, 1901 Euchelicerata Weygoldt & Paulus, 1979 Xiphosura Latreille, 1802 - horseshoe crabs see Class Xiphosura Latreille, 1802