In which subclass of Reptilia, the skull possesses, a solid roof

Options

A. Anapsida
B. Diapsida
C. Parapsida
D. Synaspsida.

Answer

To determine the subclass of Reptilia in which the skull possesses a solid roof, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Subclasses of Reptilia**: The main subclasses of Reptilia include Anapsida, Diapsida, and Synapsida. Parapsida is not commonly recognized as a major subclass in modern classifications.

2. **Understand Skull Structures**:
- **Anapsida**: This subclass is characterized by a skull that has no temporal openings. Therefore, it has a solid roof.
- **Diapsida**: This subclass has two temporal openings in the skull, which means it does not have a solid roof.
- **Synapsida**: Similar to Diapsida, this subclass has openings in the skull, indicating it does not have a solid roof.

3. **Analyze the Characteristics**:
- Since Anapsida has no openings near the temples of the skull, it is the only subclass that possesses a solid roof.

4. **Examples of Anapsida**: Turtles are a primary example of reptiles in the Anapsida subclass, along with some extinct forms from the Permian period.

5. **Conclusion**: Based on the analysis, the subclass of Reptilia that possesses a solid roof in the skull is **Anapsida**.

### Final Answer:
The subclass of Reptilia in which the skull possesses a solid roof is **Anapsida**.