Kingdom Animalia Linnaeus, 1758 - animals Phylum Arthropoda Siebold, 1848 - arthropods Subphylum Chelicerata Heymons, 1901 Class Arachnida Lamarck, 1801 Superorder Parasitiformes Reuter, 1909 - ticks and ticklike mites 1 Order Opilioacarida Zakhvatkin, 1952 [monotypic] 2 Order Holothyrida Thon, 1905 [monotypic] - holothyrans 3 Order Ixodida Leach, 1815 [monotypic] - ticks 4 Order Mesostigmata Canestrini, 1891