Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Arthropoda Siebold, 1848 - arthropods
     Subphylum Chelicerata Heymons, 1901
       Class Arachnida Lamarck, 1801
         Order Scorpiones Koch, 1837 - scorpions
           Suborder Neoscorpionina Thorell & Lindström, 1885
             Infraorder Orthosternina Pocock, 1911 see Infraorder Orthosterni Pocock, 1911
               Family Hormuridae Laurie, 1896
                 1 Genus †Protoischnurus Carvalho & Lourenço, 2001
                 2 Genus Tibetiomachus Lourenço & Qi, 2006