After Okulitch, 1955

<==o †Monocyathea Okulitch, 1943 (nom. transl. Okulitch, 1955 ex Monocyatha Okulitch, 1943)
   |--o †Archaeophyllida Okulitch, 1943 (nom. transl. Okulitch, 1955 ex Archaeophyllina Okulitch, 1943)
   |  `--o †Archaeophyllidae Vologdin, 1931
   |     |--o †Archaeophyllum Vologdin, 1931
   |     |  `-- †A. edelsteini Vologdin, 1931
   |     `--o †Butovia Vologdin, 1931
   |        `-- †B. settata Vologdin, 1931
   `--o †Monocyathida Okulitch, 1943 (nom. transl. Okulitch, 1955 ex Monocyathina Okulitch, 1943)
      |--o †Monocyathidae Bedford & Bedford, 1934
      |  |?-o ?†Tunkia Bedford & Bedford, 1936
      |  |  `-- †T. incerta Bedford & Bedford, 1936
      |  |--o †Monocyathus Bedford & Bedford, 1934 [Archaeolynthus Taylor, 1910 (nomen nudum)]
      |  |  `-- †M. porosus Bedford & Bedford, 1934
      |  |--o †Rhabdocnema Okulitch, 1937 [pro Rhabdocyathus Toll, 1899 (non Brooks, 1893)]
      |  |  |-- †R. sibiricus (Toll, 1899) [Rhabdocyathus sibiricus Toll, 1899]
      |  |  `-- †R. solidimurus (Vologdin)
      |  `--o †Rhabdocyathella Vologdin, 1937
      |     `-- †R. beileyi Vologdin, 1937
      `--o †Rhizacyathidae Bedford & Bedford, 1939
         |--o †Rhizacyathus Bedford & Bedford, 1939
         |  `-- †R. radix (Bedford & Bedford, 1937) [Protopharetra radix Bedford & Bedford, 1937]
         `--o †Bacatocyathus Vologdin 1940
            `-- †B. kazakevici Vologdin 1940

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