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Dichotomous Key/Hexanchiformes
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Hexanchiformes Animalia Chordata Vertebrata Chondrichthyes Elasmobranchii Selachimorpha Hexanchiformes
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