After Dzik, 2008

<==o †Halicyna Gall & Grauvogel, 1967 [Cyclida]
   `--o †Cycloidea Glaessner, 1928
      |--o †Cyclus de Koninck, 1841 [Cyclidae Packard, 1885]
      |  |-- †C. bilobatus
      |  |-- †C. communis Rogers, 1902
      |  |-- †C. wrighti
      |  |-- †C. jonesianus
      |  |-- †C. torosus
      |  |-- †C. simulans
      |  |-- †C. harknesi
      |  |-- †C. radialis
      |  |-- †C. woodwardi
      |  |-- †C. martinensis
      |  `-- †C. miloradovitchi
      |-- †Apionicon apioides
      |--+--o †Schramine Dzik, 2008 [Schraminidae Dzik, 2008]
      |  |  |-- †S. montanaensis (Schram et al., 2006) Dzik, 2008
      |  |  |-- †S. max (Schram et al., 1997) Dzik, 2008
      |  |  |-- †S. gondwanae (Brambilla et al., 2002) Dzik, 2008 [Halicyne gondwanae Brambilla et al., 2002]
      |  |  `-- †S. mamoroi (Pasini & Garassino, 2007) Dzik, 2008 [“Halicyne” mamoroi Pasini & Garasssino, 2007]
      |  `--o †Halicynidae Gall & Grauvogel, 1967
      |     |--o †Halicyne
      |     |  |-- †H. ornata Trümpy, 1957 [Halicyne silesiensis Alexandrowicz, 1973]
      |     |  |?- ?†H. laxa (Meyer, 1838)
      |     |  `-- †H. agnota (Meyer, 1847)
      |     `-- †Opolanka decorosa Dzik, 2008
      |--o †Americlus Dzik, 2008 [Americlidae Dzik, 2008]
      |  |-- †A. scotti
      |  |-- †A. johnsoni
      |  |-- †A. americanus
      |  `-- †A. obesus
      |-- †Oonocarcinus insignis Gemmellaro, 1890 [O. geinitzi; O. anceps]
      |-- †Paraprosopon reussi Gemmellaro, 1890
      |-- †Carcinaspides pustulosus (Schafhaütl, 1863)
      |-- †Cyclocarcinoides serratus (Stolley, 1915)
      |-- †Maastrichtiocaris rostrata Fraaije et al., 2003, emend. Dzik, 2008 [Maastrichtiocaris rostratus Fraaije et al., 2003]
      |-- †Juracyclus posidoniae Schweigert, 2007
      |?- †Stagmacaris quenstedti
      |--o †Mesoprosopidae Glaessner, 1969
      |  `--o †Mesoprosopon
      |     |-- †M. triasinum Stolley, 1915
      |     `-- †M. rostrata
      `--o †Hemitrochiscidae Trauth, 1918
         `-- †Hemitrochiscus paradoxus Schauroth, 1854

Reference(s):