Dichotomous Key/Selachimorpha

Dichotomous Key
Selachimorpha
Kingdom Animalia
Phylum Chordata
Subphylum Vertebrata
Class Chondrichthyes
Subclass Elasmobranchii
Superorder Selachimorpha

1

  • Anal fin
    • Present - #2
    • Not present - #3

2

3

  • Body shape
    • Flattened - Squatiniformes
    • Fusiform - #4

4

  • Snout length
    • Long - Squaliformes
    • Short - Pristiophoriformes

5

  • Fin spines
    • Present - Heterodontiformes
    • Not present - #6

6

  • Mouth position
    • In front of eyes - Orectolobiformes
    • Behind eyes - #7

7

  • Nictitating membrane
    • Present - Carcharhiniformes
    • Not present - Lamniformes
Last modified on 7 September 2009, at 00:06