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 †Americlidae Dzik, 2008
         Genus †Americlus Dzik, 2008
           1 †Americlus scotti (Woodward, 1893)
           2 †Americlus obesus (Schram, Vonk & Hof, 1997)
           3 †Americlus americanusᵀ (Packard, 1885)
           4 †Americlus johnsoni (Woodward, 1894)