Forests of integumentary nephridia are present in
1)Pharyngeal region
2) Clitellar region
3) Pre clitellar region
4) Post clitellar region

Options

A. Pharyngeal region
B. Clitellar region
C. Pre clitellar region
D. Post clitellar region

Explanation

To solve the question regarding the presence of forests of integumentary nephridia in annelids, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Excretory System in Annelids**:
- Annelids (segmented worms) utilize nephridia as their excretory organs instead of kidneys, which are not developed in these lower organisms.

2. **Types of Nephridia**:
- There are three types of nephridia in annelids:
- **Septal Nephridia**
- **Integumentary Nephridia**
- **Pharyngeal Nephridia**

3. **Focus on Integumentary Nephridia**:
- Integumentary nephridia are scattered throughout the body wall of each segment of the annelid, except for the first two segments.

4. **Distribution of Integumentary Nephridia**:
- Each segment (excluding the first two) contains approximately 200 to 250 integumentary nephridia.

5. **Clitellar Region**:
- In the clitellar region, the number of integumentary nephridia increases significantly, ranging from 2000 to 2500 per segment. This substantial increase is referred to as the "forest of integumentary nephridia."

6. **Conclusion**:
- Based on the information, the forests of integumentary nephridia are specifically present in the **clitellar region** of the annelid.

### Final Answer:
The forests of integumentary nephridia are present in the **Clitellar region** (Option 2).

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