Class Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
   Subclass Branchiura Thorell, 1864 - fish lice
     Order †Cyclida Schram, Vonk & Hof, 1997, nom. corr.
       Genus †Maastrichtiocaris Fraaije, Schram & Vonk, 2003
         1 †Maastrichtiocaris rostrata Fraaije, Schram & Vonk, 2003, nom. corr.