Skull is diapsid in

Options

A. Corocodile, Turtle and Seymouria
B. Natrix, Draco and Turtle
C. Calotes, Cobra and Varanosaurus
D. Sphenodon, Crocodile and viper.

Answer

To determine which group of animals has a diapsid skull, we need to analyze the options given in the question. A diapsid skull is characterized by having two temporal fenestrae (holes) behind the eyes. This type of skull is found in various reptiles, including crocodiles, lizards, snakes, and birds.

### Step-by-Step Solution:

1. **Understand the Definition of Diapsid Skull**:
- A diapsid skull is defined by the presence of two temporal fenestrae on each side of the skull. This structure allows for stronger jaw muscles and a more robust skull.

2. **Analyze Each Option**:
- **Option A: Crocodile, Turtle, and Seymouria**:
- Crocodiles have a diapsid skull.
- Turtles typically have anapsid skulls (no temporal fenestrae).
- Seymouria is a genus that is not classified as a true reptile and has anapsid features.
- **Conclusion**: This option is not correct.

- **Option B: Natrix, Draco, and Turtle**:
- Natrix (a genus of water snakes) has a diapsid skull.
- Draco (flying lizards) also has a diapsid skull.
- Turtles, as mentioned, have anapsid skulls.
- **Conclusion**: This option is not correct.

- **Option C: Calots, Cobra, and Veranosaurus**:
- Calots (a type of lizard) have a diapsid skull.
- Cobras (a type of snake) also have a diapsid skull.
- Veranosaurus is not a well-known genus, but if it is a type of reptile, it may have a diapsid skull.
- **Conclusion**: This option could be correct, but we need to verify Veranosaurus.

- **Option D: Spinodon, Crocodile, and Viper**:
- Spinodon (Sphenodon, also known as tuatara) has a diapsid skull.
- Crocodiles have a diapsid skull.
- Vipers (a type of snake) have a diapsid skull.
- **Conclusion**: All three animals in this option have diapsid skulls.

3. **Final Decision**:
- Based on the analysis, the correct answer is **Option D: Spinodon, Crocodile, and Viper**.

### Final Answer:
The skull is diapsid in **Option D: Spinodon, Crocodile, and Viper**.