Class Scorpionida Latreille, 1810 - scorpions
   Order Scorpiones Koch, 1837 - scorpions
     01 ?Genus †Praearcturus Woodward, 1871
     02 ?Genus †Branchioscorpio Kjellesvig-Waering, 1986
     03 ?Genus †Acanthoscorpio Kjellesvig-Waering, 1986
     04 ?Genus †Gigantoscorpio Størmer, 1963
     05 ?Genus †Centromachus Thorell & Lindström, 1885
     06 ?Genus †Cyclophthalmus Corda, 1835
     07 ?Genus †Anthracochaerilus Kjellesvig-Waering, 1986
     08 ?Genus †Trachyscorpio Kjellesvig-Waering, 1986
     09 ?Genus †Scoloscorpio Stockwell, 1989, orth. inval. see Genus Scoloposcorpio Kjellesvig-Waering, 1986
     10 ?Genus †Garnettius Petrunkevitch, 1953
     11 ?Genus †Palaeobuthus Petrunkevitch, 1913
     12 ?Genus †Boreoscorpio Kjellesvig-Waering, 1986
     13 ?Genus †Leioscorpio Kjellesvig-Waering, 1986 see Genus Compsoscorpius Petrunkevitch, 1949
     14 ?Genus †Opsieobuthus Kjellesvig-Waering, 1986
     15 ?Genus †Pseudobuthiscorpius Kjellesvig-Waering, 1986 see Genus Compsoscorpius Petrunkevitch, 1949
     16 ?Genus †Petaloscorpio Kjellesvig-Waering, 1986
     17 ?Genus †Waterstonia Kjellesvig-Waering, 1986
     18 ?Genus †Stenoscorpio Kjellesvig-Waering, 1986
     19 ?Genus †Willsiscorpio Kjellesvig-Waering, 1986
     20 ?Genus †Spongiophonus Wills, 1947
     21 ?Genus †Liassiscorpionides Stockwell, 1989, orth. inval. see Genus Liassoscorpionides Bode, 1951
     22 ?Genus †Mioscorpio Kjellesvig-Waering, 1986
     23 Suborder †Mesoscorpionina (Stockwell, 1989)
     24 Suborder Neoscorpionina Thorell & Lindström, 1885