Order Scorpiones Koch, 1837 - scorpions
   01 Family Bothriuridae Simon, 1880
   02 Family Buthidae Koch, 1837
   03 Family Chactidae Pocock, 1893
   04 Family Chaerilidae Pocock, 1893 [monotypic]
   05 Family Diplocentridae Karsch, 1880
   06 Family Euscorpiidae Laurie, 1896
   07 Family Hemiscorpiidae Pocock, 1893
   08 Family Heteroscorpionidae Kraepelin, 1905 [monotypic]
   09 Family Iuridae Thorell, 1876
   10 Family Liochelidae Fet & Bechly, 2001 (1879) see Family Hormuridae Laurie, 1896
   11 Family Microcharmidae Lourenço, 1996 see Family Buthidae Koch, 1837
   12 Family Pseudochactidae Gromov, 1998 [monotypic]
   13 Family Scorpionidae Latreille, 1802
   14 Family Scorpiopidae Kraepelin, 1905
   15 Family Superstitioniidae Stahnke, 1940
   16 Family Troglotayosicidae Lourenço, 1998
   17 Family Urodacidae Pocock, 1893 [monotypic]
   18 Family Vaejovidae Thorell, 1876