A parietal eye is found in

Options

A. Sphenodun
B. Uromastix
C. Garden lizard
D. Marine Turtle.

Answer

### Step-by-Step Solution:

1. **Understanding the Parietal Eye**: The parietal eye, also known as the third eye, is a type of photoreceptive organ. It is capable of sensing light and is associated with the pineal gland.

2. **Identifying Organisms with a Parietal Eye**: The parietal eye is primarily found in certain reptiles. One of the most notable examples of an organism that possesses a parietal eye is the sphenodon.

3. **Evaluating Other Options**:
- **Euromastix**: This is a type of lizard, and lizards do not have a parietal eye.
- **Garden Lizard**: Similar to Euromastix, garden lizards do not possess a parietal eye.
- **Marine Turtle**: Turtles are aquatic reptiles and do not require a parietal eye for photoreception, making this option incorrect as well.

4. **Conclusion**: Based on the information gathered, the parietal eye is specifically found in the sphenodon. Therefore, the correct answer to the question is that a parietal eye is found in **sphenodon**.

### Final Answer:
A parietal eye is found in **sphenodon**.

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