Enteronephric nephridia of Earthworm are

Options

A. Pharyngeal and septal
B. Pharyngeal
C. Septal
D. Integumentary

Answer

To answer the question about the enteronephric nephridia of earthworms, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Nephridia**: Nephridia are the excretory structures in earthworms responsible for the removal of waste products from the body.

2. **Identify Types of Nephridia**: There are three types of nephridia in earthworms:
- **Septal Nephridia**: Located in the intersegmental septa from the 15th segment to the last segment. They have a nephrostome.
- **Integumentary Nephridia**: Present from the third segment to the last segment. They are V-shaped and do not have a nephrostome.
- **Pharyngeal Nephridia**: Found in three pairs on the 4th, 5th, and 6th segments. They also do not have a nephrostome.

3. **Classify Enteronephric Nephridia**: Enteronephric nephridia are those that release excretory products into the elementary canal. The types of nephridia that fall under this category are:
- **Septal Nephridia**
- **Pharyngeal Nephridia**

4. **Identify the Correct Answer**: Based on the classification, both septal and pharyngeal nephridia are enteronephric. Therefore, the correct answer to the question is that enteronephric nephridia of earthworms are **pharyngeal and septal**.

### Final Answer:
The enteronephric nephridia of earthworms are **pharyngeal and septal**.

---