Dichotomous Key/Hexanchiformes

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Dichotomous Key

Hexanchiformes
Kingdom	Animalia
Phylum	Chordata
Subphylum	Vertebrata
Class	Chondrichthyes
Subclass	Elasmobranchii
Superorder	Selachimorpha
Order	Hexanchiformes
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1

• Tissue on gill slits
  • Protruding - Chlamydoselachus anguineus
  • Not protruding - #2

2

• Number of gills
  • Six - #3
  • Seven - #4

3

• Number of pups in one litter
  • 22 to 108 - Hexanchus griseus
  • 13 or less - Hexanchus nakamurai

4

• Spots
  • Present - Notorynchus cepedianus
  • Absent - Heptranchias perlo