[Neoselachii] Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977
   Order Heterodontiformes Compagno, 1973 [monotypic] - bullhead sharks
     Family Heterodontidae Gray, 1851 [monotypic] - bullhead and horn sharks
       Genus Heterodontus Blainville, 1816
         1 Heterodontus francisci (Girard, 1855) - horn shark
         2 Heterodontus galeatus (Günther, 1870) - crested bullhead shark
         3 Heterodontus japonicus Miklouho-Maclay & Macleay, 1884 - Japanese bullhead shark
         4 Heterodontus mexicanus Taylor & Castro-Aguirre, 1972 - Mexican hornshark
         5 Heterodontus portusjacksoniᵀ (Meyer, 1793) - Port Jackson shark
         6 Heterodontus quoyi (Fréminville, 1840) - Galapagos bullhead shark
         7 Heterodontus ramalheira (Smith, 1949) - whitespotted bullhead shark
         8 Heterodontus zebra (Gray, 1831) - striped cat shark