After Nelson, 1994, Mould, 1995-1997, 1996, and Williams, G. S., 1999-2000

<==o Hexanchidae Gray, 1851 [Notidanidae] (monikidushait)
   |--o Heptranchias Rafinesque, 1810 [Notidanodon] R. Oc. Cret. Mioc. NA. Olig. EAs. U. Eoc. Aus. L. Cret. Eu. 
   |  |-- †H. ezoensis Applegate & Uyeno, 1968
   |  |-- †H. howelii (Reed, 1946)
   |  |-- †H. tenuidens (Leriche, 1938)
   |  `-- H. perlo (Bonnaterre, 1788) (kapeapäähai)
   |--o Hexanchus Rafinesque, 1810 [Notidanus] R. Oc. U. Cret. SWAs. U. Eoc. Aus. U. Cret. Tert. Eu. NAf.
   |  |-- †H. gracilis
   |  |-- †H. agassizii Cappetta, 1976
   |  |-- †H. andersoni Jordan, 1907
   |  |-- †H. collinsonae Ward, 1979
   |  |-- †H. sp. cf. H. collisonae
   |  |-- †H. gigas (Sismonda, 1857)
   |  |-- †H. hookeri Ward, 1979
   |  |-- †H. microdon (Agassiz, 1843)
   |  |-- †H. sp. cf. H. microdon
   |  |-- †H. sp.
   |  |-- †H. sp. [Pliocene, USA: North Carolina: Lee Creek Mine] [Purdy et al., 2001]
   |  |-- H. nakamurai Teng, 1962 (pikkukidushai)
   |  `-- H. griseus (Bonaterre, 1788) [1780??] (kidushai)
   |--o †Notidanodon Cappetta, 1975 [Heptranchias??] U. Cret. EAs. Paleoc. Eu. NAf.
   |  |-- †N. brotzeni Siverson, 1995
   |  |-- †N. lanceolatus
   |  |-- †N. loozi (Vincent, 1876)
   |  `-- †N. pectinatus (Agassiz, 1843)
   |--o Notorynchus Ayres, 1855 [Notidanus] U. Cret. Aust. Eu. Eoc. NA. CAs. Eu. Olig. NA. Mioc. Aus. NA. Eu. Plio. Aust. R. Oc.
   |  |-- †N. aptiensis (Pictet, 1865)
   |  |-- †N. kempi Ward, 1979
   |  |-- †N. primigenius (Agassiz, 1843) [Notidanus primigenius Agassiz, 1843]
   |  |-- †N. serratissimus (Agassiz, 1844)
   |  |-- †N. sp.
   |  `-- N. cepedianus (Peron, 1807) [Squalus cepedianus Peron, 1807; Notidanus plectrodon Cope, 1867; Notidanus primigenius Agassiz, 1843; Notorynchus maculatus Ayres, 1855] (täpläkidushai)
   |-- †Paraheptranchias repens Mioc. Eu.
   `--o †Weltonia Paleoc. Eu. NAf.
      |-- †W. ancistrodon (Arambourg, 1952)
      |-- †W. burnhamensis Ward, 1979
      `-- †W. sp.

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