Hexanchiformes
Hexanchiformes marrazo-ordena bat da. Egun ordena osatzen duten sei espezieak fosil biziduntzat jotzen dituzte adituek, historiaurretik oso eboluzio txikia izan dutelako.

Taxonomia 
 Chlamydoselachidae familia
 Chlamydoselachus Garman, 1884
 Chlamydoselachus bracheri Pfeil, 1983
 Chlamydoselachus fiedleri Pfeil, 1983
 Chlamydoselachus garmani Welton, 1979
 Chlamydoselachus goliath Antunes & Cappetta, 2001
 Chlamydoselachus gracilis Antunes & Cappetta, 2001
 Chlamydoselachus keyesi Mannering & Hiller, 2008
 Chlamydoselachus landinii Carrillo-Briceño, Aguilera & Rodriguez, 2014
 Chlamydoselachus lawleyi Davis, 1887
 Chlamydoselachus tatere Consoli, 2008
 Chlamydoselachus thomsoni Richter & Ward, 1990
 Chlamydoselachus tobleri Leriche, 1929
 Thrinax Pfeil, 1983
 Thrinax baumgartneri Pfeil, 1983
 Hexanchidae familia
 Gladioserratus Underwood, Goswami, Prasad, Verma & Flynn, 2011
 Gladioserratus aptiensis Pictet, 1865
 Gladioserratus dentatus Guinot, Cappetta & Adnet, 2014
 Gladioserratus magnus Underwood, Goswami, Prasad, Verma & Flynn, 2011
 Heptranchias Rafinesque, 1810
 Heptranchias ezoensis Applegate & Uyeno, 1968
 Heptranchias howelii Reed, 1946
 Heptranchias karagalensis Kozlov & Zhelezko, 1999
 Heptranchias tenuidens Leriche, 1938
 Hexanchus Rafinesque, 1810
 Hexanchus agassizi Cappetta, 1976
 Hexanchus andersoni Jordan, 1907
 Hexanchus casieri Kozlov, 1999
 Hexanchus collinsonae Ward, 1979
 Hexanchus gracilis Davis, 1887
 Hexanchus hookeri Ward, 1979
 Hexanchus microdon Agassiz, 1843
 Hexanchus tusbairicus Kozlov in Zhelezko & Kozlov, 1999
 Notidanoides Maisey 1986
 Notidanoides muensteri Agassiz, 1843
 Notidanodon Cappetta, 1975
 Notidanodon brotzeni Siverson, 1995
 Notidanodon dentatus Woodward, 1886
 Notidanodon lanceolatus Woodward, 1886
 Notidanodon loozi Vincent, 1876
 Notidanodon pectinatus Agassiz, 1843
 Notidanus Cuvier
 Notidanus amalthei Oppel, 1854
 Notidanus atrox Ameghino, 1899 
 Notidanus intermedius Wagner, 1862
 Notidanus nikitini Chabakov & Zonov, 1935
 Notorynchus Ayres, 1855
 Notorynchus borealus Jordan & Hannibal, 1923
 Notorynchus kempi Ward, 1979
 Notorynchus lawleyi Cigala Fulgosi, 1983
 Notorynchus primigenius Agassiz, 1843
 Notorynchus serratissimus Agassiz, 1843
 Pachyhexanchus Cappetta, 1990
 Pachyhexanchus pockrandti Ward & Thies, 1987
 Paraheptranchias Pfeil, 1981
 Paraheptranchias repens Probst, 1879
 Pseudonotidanus Underwood & Ward, 2004
 Pseudonotidanus semirugosus Underwood & Ward, 2004
 Weltonia Ward, 1979
 Weltonia ancistrodon Arambourg, 1952
 Weltonia burnhamensis Ward, 1979
 Mcmurdodontidae familia
 Mcmurdodus White, 1968
 Mcmurdodus featherensis White, 1968
 Mcmurdodus whitei Turner, & Young, 1987

Kanpo estekak
Hexanchiformes marrazo-ordena bat da . Egun ordena osatzen duten sei espezieak fosil biziduntzat jotzen dituzte adituek , historiaurretik oso eboluzio txikia izan dutelako . Taxonomia Chlamydoselachidae familia Chlamydoselachus Garman , Chlamydoselachus bracheri Pfeil , Chlamydoselachus fiedleri Pfeil , Chlamydoselachus garmani Welton , Chlamydoselachus goliath Antunes & Cappetta , Chlamydoselachus gracilis Antunes & Cappetta , Chlamydoselachus keyesi Mannering & Hiller , Chlamydoselachus landinii Carrillo-Briceño , Aguilera & Rodriguez , Chlamydoselachus lawleyi Davis , Chlamydoselachus tatere Consoli , Chlamydoselachus thomsoni Richter & Ward , Chlamydoselachus tobleri Leriche , Thrinax Pfeil , Thrinax baumgartneri Pfeil , Hexanchidae familia Gladioserratus Underwood , Goswami , Prasad , Verma & Flynn , Gladioserratus aptiensis Pictet , Gladioserratus dentatus Guinot , Cappetta & Adnet , Gladioserratus magnus Underwood , Goswami , Prasad , Verma & Flynn , Heptranchias Rafinesque , Heptranchias ezoensis Applegate & Uyeno , Heptranchias howelii Reed , Heptranchias karagalensis Kozlov & Zhelezko , Heptranchias tenuidens Leriche , Hexanchus Rafinesque , Hexanchus agassizi Cappetta , Hexanchus andersoni Jordan , Hexanchus casieri Kozlov , Hexanchus collinsonae Ward , Hexanchus gracilis Davis , Hexanchus hookeri Ward , Hexanchus microdon Agassiz , Hexanchus tusbairicus Kozlov in Zhelezko & Kozlov , Notidanoides Maisey Notidanoides muensteri Agassiz , Notidanodon Cappetta , Notidanodon brotzeni Siverson , Notidanodon dentatus Woodward , Notidanodon lanceolatus Woodward , Notidanodon loozi Vincent , Notidanodon pectinatus Agassiz , Notidanus Cuvier Notidanus amalthei Oppel , Notidanus atrox Ameghino , Notidanus intermedius Wagner , Notidanus nikitini Chabakov & Zonov , Notorynchus Ayres , Notorynchus borealus Jordan & Hannibal , Notorynchus kempi Ward , Notorynchus lawleyi Cigala Fulgosi , Notorynchus primigenius Agassiz , Notorynchus serratissimus Agassiz , Pachyhexanchus Cappetta , Pachyhexanchus pockrandti Ward & Thies , Paraheptranchias Pfeil , Paraheptranchias repens Probst , Pseudonotidanus Underwood & Ward , Pseudonotidanus semirugosus Underwood & Ward , Weltonia Ward , Weltonia ancistrodon Arambourg , Weltonia burnhamensis Ward , Mcmurdodontidae familia Mcmurdodus White , Mcmurdodus featherensis White , Mcmurdodus whitei Turner , & Young , Kanpo estekak