Arthropoda Siebold, 1848 - arthropods
   [Euarthropoda]
     Class Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
       Labrophora Siveter, Waloszek & Williams
         Order †Phosphatocopida Müller, 1964
           †Euphosphatocopida
             Suborder †Hesslandonina Müller, 1982
               Family †Cyclotronidae Grundel, 1981
                 Genus †Cyclotron Rushton, 1969
                   †Cyclotron lapworthi (Groom, 1902)