411 REFERENCE · Wikibooks
Dichotomous Key/Selachimorpha
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Selachimorpha Animalia Chordata Vertebrata Chondrichthyes Elasmobranchii 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
Short - ../Squaliformes/
Long - ../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/