Mikko's Phylogeny Archive Main Groups of Protostomes   Phacopida

After Gon, 2002

<==o †PHACOPIDA Salter, 1864
   |--o †CALYMENINA
   |  `--o †CHALYMENOIDEA
   |     |-- †Calymenidae
   |     |--o †Homalonotidae
   |     |  `?-o †Lakaspis Kobayashi, 1937
   |     |     `-- †L. apolonista (Lake, 1906) [Symphysurus apolonista Lake, 1906]
   |     |-- †Carmonidae
   |     `-- †Bathycheilidae
   |--o †PHACOPINA
   |  |--o †PHACOPOIDEA [Phacopacea]
   |  |  |-- †Phacopidae
   |  |  `-- †Pterygometopidae
   |  |--o †DALMANITOIDEA [Dalmanitacea]
   |  |  |-- †Dalmanitidae
   |  |  |-- †Prosopiscidae
   |  |  `-- †Diaphanometopidae
   |  `--o †ACASTOIDEA
   |     |-- †Acastidae
   |     `-- †Calmoniidae
   `--o †CHEIRURINA
      `--o †CHEIRUROIDEA
         |-- †Cheiruridae
         |-- †Pliomeridae
         |-- †Pilekiidae
         |-- †Encrinuridae
         |-- †Staurocephalidae
         `-- †Hammatocnemidae

Reference(s):

Gon III, S. M., 2002: Systematic listing of Trilobite families.
–iNet: http://www.aloha.net/~smgon/trisystem.htm