Classification of Yamagishi 2004

Cl. Chondrichthyes Huxley 1880 [cartilaginous fish]
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Subcl. Elasmobranchii Bonaparte 1838 [elasmobranch]
Unr. Neoselachii Compagno 1977
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Or. Squalomorphii Compagno 1973
Superor. Squalomorphii Compagno 1973
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Or. †Synechodontiformes Duffin and Ward 1993
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Fm. †Palaeospinacidae Regan 1906
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G. †Synechodus Woodward 1888
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†Synechodus triangulus Yamagishi 2004
Unr. Euselachii Hay 1902
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Superfm. †Hybodontoidea Agassiz 1834
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Fm. †Acrodontidae Casier 1959
G. †Arctacanthus Nielsen 1932
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†Arctacanthus exiguus Yamagishi 2004
Fm. †Hybodontidae Agassiz 1834
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G. †Hybodus Agassiz 1834
Fm. †Polyacrodontidae Glükman 1964
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G. †Polyacrodus Jaekel 1889