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Hexanchiformes

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Kingdom  Animalia
Subclass  Elasmobranchii
Scientific name  Hexanchiformes
Rank  Order
Phylum  Chordata
Superorder  Selachimorpha
Higher classification  Shark
Hexanchiformes Hexanchiformes cow sharks frilled sharks Wildlife Journal Junior
Lower classifications  Cow shark, Chlamydoselachus

The Hexanchiformes are the order consisting of the most primitive types of sharks, and numbering just six extant species. Fossil sharks that were apparently very similar to modern sevengill species are known from Jurassic specimens.

Hexanchiformes Hexanchiformes Untamed Science

Hexanchiform sharks have only one dorsal fin, either six or seven gill slits, and no nictitating membrane in the eyes. Shark teeth similar to those modern hexanchids are known from Devonian deposits in Antarctica and Australia, as well as Permian deposits in Japan. If these are in fact hexanchids, this may be the only extant order of elasmobranchs to have survived after the Permian extinction (and by extension, the oldest extant order of elasmobranchs) .

Hexanchiformes sharkrayresearchweeblycomuploads2436243628

The frilled shark, Chlamydoselachus anguineus, is very different from the cow sharks, and it has been proposed to be moved to its own order, Chlamydoselachiformes.

Hexanchiformes ChondrichthyesFossil Groups SciComms 0405 Earth Sciences

==Classific Living

  • Family Chlamydoselachidae Garman 1884 (frilled sharks)
  • Chlamydoselachus Garman, 1884
  • Chlamydoselachus africana Ebert & Compagno, 2009 (Southern African frilled shark)
  • Chlamydoselachus anguineus Garman, 1884 (Frilled shark)
  • Family Hexanchidae J. E. Gray 1851 (Cow sharks)
  • Heptranchias Rafinesque, 1810
  • Heptranchias perlo (Bonnaterre, 1788) (sharpnose sevengill shark)
  • Hexanchus Rafinesque, 1810
  • Hexanchus griseus (Bonnaterre, 1788) (bluntnose sixgill shark)
  • Hexanchus nakamurai Teng, 1962 (bigeyed sixgill shark)
  • Notorynchus Ayres, 1855
  • Notorynchus cepedianus (Péron, 1807) (broadnose sevengill shark)

  • Extinct species

  • Family Chlamydoselachidae
  • Chlamydoselachus Garman, 1884
  • Chlamydoselachus bracheri Pfeil, 1983
  • Chlamydoselachus fiedleri Pfeil, 1983
  • Chlamydoselachus garmani Welton, 1983
  • Chlamydoselachus goliath Antunes & Cappetta, 2002
  • Chlamydoselachus gracilis Antunes & Cappetta, 2002
  • 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
  • Proteothrinax Pfeil, 1983
  • Proteothrinax baumgartneri Pfeil, 1983
  • Family Crassonotidae
  • Crassodontidanus Kriwet & Klug, 2011
  • Crassodontidanus serratus Fraas, 1855
  • Crassodontidanus wiedenrothi Thies, 1983
  • Notidanoides Maisey, 1986
  • Notidanoides muensteri Agassiz, 1843
  • Notidanus Cuvier, 1816
  • Notidanus amalthei Oppel, 1854
  • Notidanus atrox Ameghino, 1899
  • Notidanus intermedius Wagner, 1862
  • Notidanus nikitini Chabakov & Zonov, 1935
  • Pachyhexanchus Cappetta, 1990
  • Pachyhexanchus pockrandti Ward & Thies, 1987
  • Family Hexanchidae
  • Gladioserratus Underwood, Goswami, Prasad, Verma & Flynn, 2011
  • Gladioserratus aptiensis Pictet, 1864
  • Gladioserratus dentatus Guinot, Cappetta & Adnet, 2014
  • Gladioserratus magnus Underwood, Goswami, Prasad, Verma & Flynn, 2011
  • Heptranchias Rafinesque, 1810
  • Heptranchias ezoensis Applegate & Uyeno, 1968
  • Heptranchias howellii Reed, 1946
  • Heptranchias karagalensis Kozlov in Zhelezko & Kozlov, 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
  • Notidanodon Cappetta, 1975
  • Notidanodon brotzeni Siverson, 1995
  • Notidanodon dentatus Woodward, 1886
  • Notidanodon lanceolatus Woodward, 1886
  • Notidanodon loozi Vincent, 1876
  • Notidanodon pectinatus Agassiz, 1843
  • 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
  • Notorynchus subrecurvus Oppenheimer, 1907
  • Pachyhexanchus Cappetta, 1990
  • Pachyhexanchus pockrandti Ward & Thies, 1987
  • Paraheptranchias Pfeil, 1981
  • Paraheptranchias repens Probst, 1879
  • Pseudonotidanus Underwood & Ward, 2004
  • Pseudonotidanus semirugosus Underwood & Ward, 2004
  • Welcommia Cappetta, 1990
  • Welcommia bodeuri Cappetta, 1990
  • Welcommia cappettai Klug & Kriwet, 2010
  • Weltonia Ward, 1979
  • Weltonia ancistrodon Arambourg, 1952
  • Weltonia burnhamensis Ward, 1979
  • Family Mcmurdodontidae ?
  • Mcmurdodus White, 1968
  • Mcmurdodus featherensis White, 1968
  • Mcmurdodus whitei Turner, & Young, 1987
  • Family Orthacodontidae
  • Occitanodus Guinot, Cappetta & Adnet, 2014
  • Occitanodus sudrei Guinot, Cappetta & Adnet, 2014
  • Orthacodus Woodward, 1889
  • Orthacodus longidens Agassiz, 1843
  • Sphenodus Agassiz, 1843
  • Sphenodus alpinus Gümbel, 1861
  • Sphenodus longidens Agassiz, 1843
  • Sphenodus lundgreni Davis, 1890
  • Sphenodus macer Quenstedt, 1852
  • Sphenodus nitidus Wagner, 1862
  • Sphenodus planus Agassiz, 1843
  • Sphenodus rectidens Emmons, 1858
  • Sphenodus robustidens Seguenza, 1900
  • Sphenodus tithonius Gemmellaro, 1871
  • Sphenodus virgai Gemmellaro, 1871

  • Hexanchiformes Cochise College P
    Hexanchiformes Hexanchiformes

    References

    Hexanchiformes Wikipedia


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