Dichotomous Key/Reptilia
< Dichotomous Key
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| Chordata keys |
| Subphyla |
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| Myxini | Urochordata |
| Classes |
| Actinistia | Actinopterygii | Amphibia | Aves | Chondrichthyes | Dipnoi | Mammalia | Petromyzontida | Reptilia |
1
2
- Ribs adapted into hard shells
- Present - Testudines
- Not present - Tuatara
3
- Cloacal opening
- Longitudinal slit Crocodylia
- Transverse slit - #4
4
- Jaw disarticulation
- Present - Serpentes
- Not present - Sauria
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