[Phylum] [Arthropoda] Siebold, 1848 - arthropods Chelicerata Heymons, 1901 Euchelicerata Weygoldt & Paulus, 1979 Pantetrapulmonata Shultz, 2007 [Order] †Trigonotarbida Petrunkevitch, 1949 Family †Trigonotarbidae Petrunkevitch, 1949 [monotypic] 1 Genus †Trigonotarbus Pocock, 1911