[Phylum] [Arthropoda] Siebold, 1848 - arthropods
   Chelicerata Heymons, 1901
     Euchelicerata Weygoldt & Paulus, 1979
       [Order] †Phalangiotarbida Haase, 1890
         Family †Heterotarbidae Petrunkevitch, 1913 [monotypic]
           1 Genus †Heterotarbus Petrunkevitch, 1913