After Carroll, 1988 and Long, 1995

Family -level taxonomy of holocephalimorphs.

<==o Holocephalimorpha (sillikuningaskalamaiset)
   |?-o †Chondrenchelyidae [Chondrenchelyiformes]
   |  |?- †Platyxystrodus Carb. NA. 
   |  |?- †Solenodus Penn. Eu. 
   |  |-- †Chondrenchelys problematica Miss. Eu. 
   |  `-- †Harpagofututor volsellorhinus U. Miss. NA. 
   `--+?-o †Psammodontidae de Koninck, 1878 [Psammodontiformes Obruchev, 1953]
      |  |-- †Lagarodus angustus (Romanovsky, 1864) Miss. Penn. Eu.
      |  |-- †Mazodus  Miss. NA. 
      |  |--o †Psammodus [Arachaeobatis, Astrobodus, Homalodus] ?U. Dev. Miss. NA. Miss. Eu.
      |  |  |-- †P. sp. [North America, Europe]
      |  |  |-- †P. rugosus
      |  |  |-- †P. sp. [Australia]
      |  |  `-- †P. turgidus
      |  `-- †Stamiobatis Penn. NA.
      |?- †Cochliodontidae Owen, 1867 [Cochliodontiformes Obruchev, 1953]
      |?-o †Menaspidae [Menaspiformes]
      |  |-- †Deltoptychius [?Antacanthus, Listracanthus, ?Lophocanthus, Phigeacanthus, ?Phricacanthus, Platacanthus, Platycanthus, Streblodus] Miss. Penn. Eu. NA. 
      |  `-- †Menaspis armata [?Asima, ?Radamus] U. Perm. Eu. 
      `--+?-o †Copodontidae [Copodontiformes]
         |  |-- †Acmoniodus U. Dev. NA. 
         |  `-- †Copodus [Characodus, ?Dimyleus, Labodus, Mesogomphus, Mylacodus, Mylax, Pinacodus, Pleurogomphus, Rhymodus] Miss. Eu. NA. 
         `-- Chimaeriformes (sillikuningaskalat)

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