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 †Hemithrochiscidae Trauth, 1918
         1 Genus †Hemitrochiscus Schauroth, 1854
         2 Genus †Cyclocarcinides Glaessner, 1969
         3 Genus †Oonocarcinus Gemmellaro, 1890