Arthropoda Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848 Myriochelata D. Pisani et al., 2004 - myriochelatans Chelicerata Heymons, 1901 see Superclass Chelicerata Heymons, 1901 1 Xiphosura Latreille, 1802 - horseshoe crabs see Class Xiphosura Latreille, 1802 2 Arachnida Cuvier, 1812 see Class Arachnida Lamarck, 1801