[Phylum] [Arthropoda] Siebold, 1848 - arthropods Chelicerata Heymons, 1901 Euchelicerata Weygoldt & Paulus, 1979 Pantetrapulmonata Shultz, 2007 [Order] Uropygi Thorell, 1882 [monotypic] - whip scorpions [plesion] Genus †Prothelyphonus Fritsch, 1904