Dichotomous Key/Selachimorpha

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

1

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

2

Dorsal fins
- One - Hexanchiformes
- Two - #5

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

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