After Gon, 2002

<==o Proetida Fortey & Owens, 1975
   `--o Proetina [Proetacea]
      |--o †Protetoidea
      |  |-- †Proetidae
      |  `-- †Phillipsiidae
      |--o †Aulacopleuroidea
      |  |-- †Aulacopleuridae
      |  |-- †Brachymetopidae
      |  `-- †Rorringtoniidae
      `--o †Bathyuroidea [Bathyuracea; incl. Holotrachelacea]
         |-- †Bathyuridae Walcott, 1886
         |-- †Dimeropygidae
         |-- †Tornquistiidae [per Chatterton, et al. 1998]
         |-- †Celmidae
         |-- †Lecanopygidae [Illaenuridae] [also treated as a Leiostegioid ]
         |-- †Glaphuridae
         |-- †Holotrachelidae [Holotrachelacea]
         `-- †Telephinidae

Reference(s):