Classification of the family Hexanchidae
Fm. Hexanchidae Gray 1851 [cow shark]
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G. †Gladioserratus Underwood et al. 2011
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†Gladioserratus aptiensis Pictet 1865
†Gladioserratus dentatus Guinot et al. 2014
†Gladioserratus magnus Underwood et al. 2011
G. Heptranchias Rafinesque 1810 [sevengill shark]
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†Heptranchias andersoni Jordan 1907
†Heptranchias cinereus Gmelin 1789
†Heptranchias ezoensis Applegate and Uyeno 1968
†Heptranchias howellii Reed 1946
Heptranchias perlo Bonnaterre 1788
G. Hexanchus Rafinesque 1810 [sixgill shark]
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†Hexanchus agassizi Cappetta 1976
†Hexanchus gigas Sismonda 1857
†Hexanchus gracilis Davis 1887
†Hexanchus microdon Agassiz 1835
†Hexanchus wiedenrothi Thies 1983
G. †Monopterhinus Blainville 1816
G. †Notidanion Jordan 1923
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†Notidanion boreale Jordan and Hanibal 1923
†Notidanion chiconis Jordan 1907
G. †Notidanodon Cappetta 1975
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†Notidanodon dentatus Woodward 1886
†Notidanodon lanceolatus Woodward 1886
†Notidanodon pectinatus Agassiz 1843
G. Notidanus Cuvier 1817
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†Notidanus gracilis Davis 1887
†Notidanus jenningsi Chapman and Pritchard 1904
†Notidanus loozi Vincent 1876
†Notidanus marginalis Davis 1888
†Notidanus munsteri Agassiz 1843
†Notidanus recurvus Agassiz 1843
†Notidanus serratus Fraas 1855
†Notidanus tenuidens Leriche 1938
†Notidanus ultra Ameghino 1901
G. Notorhynchus Ayres 1855 [sevengill shark]
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†Notorhynchus primigenius Agassiz 1835
†Notorhynchus serratissimus Agassiz 1843
G. Notorynchus Ayers 1855
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Notorynchus maculatus Ayers 1855
†Notorynchus thevenardi Delfortrie 1878