After Okulitch, 1955

<==o †Metacyathida Bedford & Bedford, 1936 [nom. transl. Okulitch, 1955 pro Metacyathina Bedford & Bedford, 1936] [Archaeocyathida]
   |--o †Archaeocyathidae Taylor, 1910 [Spirocyathidae Taylor, 1910; Metacyathidae Bedford & Bedford, 1934; Flindersicyathidae Bedford & Bedford, 1937]
   |  |--o †Archaeocyathus Bill., 1861 [Spirocyathus Hinde, 1889; Retecyathus Vologdin, 1932; Flindersicyathus Bedford & Bedford, 1937; ?Protopharetra Born., 1884] L.Camb.
   |  |  `-- †A. atlanticus Bill., 1861
   |  |--o †Araneocyathus Vologdin, 1937; L.Camb. NCAs.
   |  |  `-- †A. ratschkovskyi Vologdin, 1937; Okulitch, 1955
   |  |--o †Archaeopharetra Bedford & Bedford, 1936; L.Camb. Aust.
   |  |  `-- †A. typica Bedford & Bedford, 1936
   |  |--o †Copleicyathus Bedford & Bedford, 1937; L.Camb. NA. Aust.
   |  |  `-- †C. confertus Bedford & Bedford, 1937
   |  |--o †Metaldetes Taylor, 1910 [Metacyathus Bedford & Bedford, 1934] L.Camb. NA. Eu. As. Aust.
   |  |  `-- †M. cylindricus Taylor, 1910
   |  `--o †Protopharetra Born., 1884
   |     `-- †P. polymorpha Born., 1884; Simon, 1939
   |--o †Pycnoidocyathidae Okulitch, 1950 [incl. Cambrocyathidae Okulitch, 1937]
   |  |--o †Pycnoidocyathus Taylor, 1910 [Cambrocyathus Okulitch, 1937] L.-M.Camb. NA. NCAs. Aust.
   |  |  |--o †(Pycnoidocyathus) Taylor, 1910
   |  |  |  `-- †P. (P.) synapticulosus Taylor, 1910
   |  |  `-- †(Archaeofungia) Taylor, 1910 [Metafungia Bedford & Bedford, 1934; Sibirecyathus Vologdin, 1937]
   |  |     `-- †P. (A.) ajax (Taylor, 1910)
   |  |--o †Ardrossacyathus Bedford & Bedford, 1937; L.Camb. Aust.
   |  |  `-- †A. endotheca Bedford & Bedford, 1937
   |  |--o †Dendrocyathus Okulitch & Roots, 1947; L.Camb. WNA.
   |  |  `-- †D. unexpectans Okulitch & Roots, 1947
   |  |--o †Echinocyathus Term. & T., 1950; L.Camb. NAf.
   |  |  `-- †E. goundafensis Term. & T., 1950
   |  |--o †Loculicyathus Vologdin, 1931
   |  |  `-- †L. irregulata
   |  |--o †Metethmophyllum Okulitch, 1943
   |  |  `-- †M. meeki (Walcott, 1891) [Ethmophyllum meeki Walcott, 1891]
   |  |--o †Paranacyathus Bedford & Bedford, 1937 [pro Paracyathus Bedford & Bedford, 1936 non Edw.-H., 1848] [Spirocyathella Vologdin, 1940] L.-M.Camb. NCAs. Aust.
   |  |  `-- †P. parvus (Bedford & Bedford, 1936) [Paracyathus parvus Bedford & Bedford, 1936]
   |  |--o †Sigmocyathus Bedford & Bedford, 1936 [Hemistillicidocyathus Ting, 1937] L.Camb.
   |  |  `-- †S. didymoteichus (Taylor, 1910) [Coscinocyathus didymoteichus Taylor, 1910]
   |  `--o †Sigmofungia Bedford & Bedford, 1936; L.Camb. Aust.
   |     `-- †S. flindersi Bedford & Bedford, 1936
   `--o †Metacoscinidae Bedford & Bedford, 1936
      |--o †Metacoscinus Bedford & Bedford, 1934; L.Camb. Aust.
      |  `-- †M. reteseptatum Bedford & Bedford, 1934
      |--o †Altaicyathus Vologdin, 1932; M.Camb. NCAs. CAs.
      |  `-- †A. nobilis Vologdin, 1932
      |--o †Archaeosycon Taylor, 1910 [=? Altaicyathus Vologdin, 1932; Aptocyathus Vologdin, 1937] L.-M.Camb. NA. NCAs.
      |  `-- †A. billingsi (Walcott, 1886) [Archaeocyathus billingsi Walcott, 1886]
      |--o †Claruscyathus Vologdin, 1932 [Eucyathus Vologdin, 1937] L.-M.Camb. NCAs. Ant.
      |  |-- †C. cumfundus Vologdin, 1932
      |  `-- †C. solidus (Vologdin)
      `--o †Paracoscinus Bedford & Bedford, 1936; L.Camb. Aust.
         `-- †P. mirabile Bedford & Bedford, 1936

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