[Phylum] [Arthropoda] Siebold, 1848 - arthropods Chelicerata Heymons, 1901 Euchelicerata Weygoldt & Paulus, 1979 [Order] Ricinulei Thorell, 1876 - ricinuleids Suborder †Palaeoricinulei Selden, 1992 Family †Poliocheridae Scudder, 1884 Genus †Terpsicroton Selden, 1992