Class Maxillopoda Dahl, 1956 see Subphylum Pancrustacea Zrzavý et al., 1997
   Subclass †Halicyna Gall & Grauvogel, 1967 see Subclass Branchiura Thorell, 1864
     Order †Cycloidea Schram, Vonk & Hof, 1997 - cycloids see Order Cyclida Schram, Vonk & Hof, 1997, nom. corr.
       Family †Cyclidae Packard, 1885
         1 Genus †Cyclus de Koninck, 1841
         2 Genus †Halicyne von Meyer, 1844
         3 Genus †Carcinaspides Glaessner, 1969
         4 Genus †Apionicon Schram, Vonk & Hof, 1997