Centrum of 8th vertebra of frog is

Options

A. Procoelous
B. Acoelous
C. Amphiplatyan
D. Amphicoelous.

Answer

To determine the type of centrum in the 8th vertebra of a frog, we will analyze the options provided and understand the characteristics of each type of vertebra.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify the type of centrum for the 8th vertebra of a frog.

2. **Reviewing the Options**:
- The options given are:
- A) Procellus
- B) Acellus
- C) Amphiplatin
- D) Amphicellus

3. **Analyzing Each Option**:
- **Option A: Procellus**
- This type has a flat anterior end and a convex posterior end. This does not match the description of the 8th vertebra of a frog.

- **Option B: Acellus**
- In this type, both anterior and posterior surfaces are flat, meaning there is no concavity. This is also not applicable to the 8th vertebra of a frog.

- **Option C: Amphiplatin**
- This type has a flat anterior and posterior surface, which again does not correspond to the 8th vertebra of a frog.

- **Option D: Amphicellus**
- This type has both the anterior and posterior ends concave. This matches the characteristics of the 8th vertebra of a frog.

4. **Conclusion**:
- Based on the analysis, the correct answer is **D) Amphicellus**, as the 8th vertebra of a frog has an amphicellous type of centrum where both ends are concave.

### Final Answer:
The centrum of the 8th vertebra of a frog is **Amphicellus**.