After Carroll, 1988, Long 1990 and Williams, 1999-2000

Family -level taxonomy of Holocephali

<==o †Paraselachimorpha [paraphyletic]
   |--o Desmiodontidae Zangerl, 1981 [Desmiodontiformes Zangerl, 1981]
   |  |--o Desmiodus Miss. NA.
   |  |  |-- D. lingoniformis "flabellum" (St. John & Worthen, 1875)
   |  |  `-- D. tumidus St. John & Worthen, 1875a
   |  `-- Heteropetalus elegantulus Lund, 1977
   |--o †Orodontidae de Koninck, 1878 [Oreodontiformes Zangerl, 1981; Orodontida Zangerl, 1981]
   |  |?- †Hercynolepis meischneri Gross, 1973, L. Dev. Eu. 
   |  |?- †Leiodus calcaratus St. John & Worthen, 1875a, Miss. NA. 
   |  |?- †Mesodmodus exsculptus St. John & Worthen, 1875a, Miss. NA. 
   |  `--o †Orodus Agassiz, 1838 [Hybodopsis, Lophodus] Miss. Eu. Penn. NA.
   |     |-- †O. cinctus Agassiz, 1838
   |     |-- †O. corrugatus Romer, 1942
   |     |-- †O. greggi Zangerl, 1981
   |     |-- †O. marginalis (Romanovsky, 1864a) [Lophodus]
   |     |-- †O. micropterygius Zangerl
   |     |-- †O. ramosus "major" Agassiz, 1838
   |     |-- †O. variabilis Newberry, 1875
   |     `-- †O. sp.
   |--o †Iniopterygiformes
   |  |?- Iniopterygiformes genera et species indet. Penn. NA. [Bear Gluch, Montana] 
   |  |-- †Iniopteryx rushlaui Penn. NA. [Iniopterygidae]
   |  `--o †Sibyrhynchidae
   |     |-- †Sibyrhynchus denisoni Penn. NA.
   |     |-- †Iniopera richardsoni Penn. NA.
   |     `-- †Inioxyele Penn. NA. 
   |-- †Eugeneodontiformes
   `-- †Petalodontiformes Zangerl, 1981 [Petalodontida Zangerl, 1981]

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