Order Pseudoscorpiones De Geer, 1778 Suborder Heterosphyronida Chamberlin, 1929 [monotypic] Superfamily Chthonioidea Daday, 1889 Family Chthoniidae Daday, 1889 1 Subfamily [Lechytiinae] Chamberlin, 1929 2 Subfamily Tridenchthoniinae Balzan, 1892