< Dichotomous Key
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| Chordata keys |
| Subphyla |
|---|
| Myxini | Urochordata |
| Classes |
| Actinistia | Actinopterygii | Amphibia | Aves | Chondrichthyes | Dipnoi | Mammalia | Petromyzontida | Reptilia |
1
- Scales
- Present - #2: Elasmobranchii
- Not present - Chimaeriformes
2: Elasmobranchii
- Open Gill position
- Ventrally - Rajomorphii
- Laterally - Selachimorpha
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