Class Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
   Subclass Branchiura Thorell, 1864 - fish lice
     Order †Cyclida Schram, Vonk & Hof, 1997, nom. corr.
       Family †Cyclidae Packard, 1885
         Genus †Cyclus de Koninck, 1841
           01 †Cyclus bilobatus Woodward, 1870
           02 †Cyclus wrighti Woodward, 1870
           03 †Cyclus jonesianus Woodward, 1870
           04 †Cyclus torosus Woodward, 1870
           05 †Cyclus simulans Reed, 1908
           06 †Cyclus radialisᵀ (Phillips, 1835)
           07 †Cyclus harknesi Woodward, 1870
           08 †Cyclus woodwardi Reed, 1893
           09 †Cyclus martinensis Goldring, 1967
           10 †Cyclus communis Rogers, 1902
           11 †Cyclus packardi Rogers, 1902
           12 †Cyclus miloradovitchi Kramarenko, 1961