After Carroll, 1988, and Lund, 1989, with species from Williams, 1999-2000

<==o †Pristodontidae Woodward, 1889
   |-- †Calopodus apicalis (St. John & Worthen, 1875) [Cranodus] Penn. NA.
   |--o †Megactenopetalus [Megactenopectalodus] L.-M. Perm. NA. M.-U. Perm. EAs. U. Perm. WAs. 
   |  |-- †M. anblyxiphias (Cope, 1891)
   |  `-- †M. kaibabanus David, 1944
   |-- †Mesolophodus problematicus (Woodward, 1889) Miss. Eu.
   |-- †Peripristis semicircularis (Newberry & Worthen, 1866) [†Ctenoptychius semicircularis] Miss. Perm. NA. 
   |-- †Petalodopsis tripartitis (Davis, 1883)
   |--o †Petalorhynchus [Petalodus] Miss. NA. Eu. EEu. U. Perm. Ind.
   |  |-- †P. benniecana
   |  |-- †P. psittacinus (M'Coy, 1855a) [Petalodus]
   |  `-- †P. bearculchensis Lund, 1989
   |--o †Pristodus [Diodontopsodus, Hoplodus, Petalorhynchus, Pristicladodus] Miss. Eu. 
   |  |-- †P. facaltus Davis, 1883
   |  `-- †P. sp.
   `-- Siksika ottae Lund, 1989

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