Class Maxillopoda Dahl, 1956 see Subphylum Pancrustacea Zrzavý et al., 1997
   Order †Cycloidea Schram, Vonk & Hof, 1997 - cycloids see Order Cyclida Schram, Vonk & Hof, 1997, nom. corr.
     Family †Cyclidae Packard, 1885
       Genus †Maastrichtiocaris Fraaije, Schram & Vonk, 2003
         †Maastrichtiocaris rostratus Fraaije, Schram & Vonk, 2003, nom. inval. see Maastrichtiocaris rostrata Fraaije, Schram & Vonk, 2003, nom. corr.