[Phylum] [Arthropoda] Siebold, 1848 - arthropods Chelicerata Heymons, 1901 Euchelicerata Weygoldt & Paulus, 1979 [Order] Palpigradi Thorell, 1888 - palpigrades 1 Genus †Paleokoenenia Rowland & Sissom, 1980 2 Family Eukoeneniidae Petrunkevitch, 1955 3 Family Prokoeneniidae Condé, 1996