<==o Cryptopidae Kohlrausch, 1881
   |-- Scolopocryptopinae Pocock, 1896 [Scolocryptopidae Pocock, 1896]
   `--+--o Plutoniuminae Bollman, 1893 [Plutoniidae Bollman, 1893]
      |  |--o Opisthemega Wood, 1862 [Opisthomega Wood, 1863]
      |  |  |--o O. erythrocephalum (Koch, 1847) [Theatops erythrocephala Koch, 1847; Theatops erythrocephalus Koch, 1847]
      |  |  |  `-- O. e. breuili Matic, 1960 [Theatops erythrocephala breuili Matic, 1960]
      |  |  |-- O. lusitanum Verhoeff, 1896
      |  |  `-- O. postica (Say, 1821) [Theatops posticus (Say, 1821)]
      |  |--o Plutonium Cavanna, 1881
      |  |  `-- P. zwierleini Cavanna, 1881 [P. zwierleinii Cavanna, 1881]
      |  `--o Theatops Newport, 1844
      |     |-- T. californiensis Chamberlin, 1902
      |     |-- T. crassipes (Meinert, 1886) [Opisthemega crassipes Meinert, 1886]
      |     |-- T. phanus Chamberlin, 1951
      |     |-- T. postica Abraham & Wolsky, 1821
      |     `-- T. spinicaudus (Wood, 1862) [Theatops spinicauda Wood, 1862; Opisthomega spinicauda Wood, 1862; Opisthemega spinicaudus; Opisthomega insulare Meinert, 1886 ]
      `-- Cryptopinae Kohlrausch, 1881

Reference(s):

Special thanks to:

Jos Dols, for gathering this information.