After Carroll, 1988, and Frickhinger, 1995

<==o †Haplolepiformes
   `--o †Haplolepidae
      |--o †Haplolepis [Eurylepis; Mecolepis; Mekolepis; Parahaplolepis] Penn. Eu. NA.
      |  `-- †H. corrugata (Newberry, 1856)
      |?-o †Microhaplolepis Penn. NA. [Diamond Mine, Linton, Ohio]
      |  |-- †M. tuberculata (Newberry, 1856) [Parahaplolepis tuberculata]
      |  |-- †M. ovoidea (Newberry, 1856)
      |  `-- †M. serrata (Newberry, 1856)
      `--o †Pyritocephalus [Teleopterina] Penn. Eu. NA.
         |-- †P. lineatus (Newberry, 1856)
         `-- †P. sculptus

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