Which of the following type of nephridia of are not found in earthworm?

Options

A. Septal nephridia
B. Pharyngeal protonephridia
C. Intergumentary nephridia
D. Protonephridia

Explanation

To solve the question "Which of the following types of nephridia are not found in earthworm?", we will analyze the options provided and determine which type is absent in earthworms.

### Step-by-Step Solution:

1. **Understand the Excretory System of Earthworms**:
- Earthworms belong to the phylum Annelida. Their excretory organs are called nephridia, which help in the removal of nitrogenous wastes from the body.

2. **Identify the Types of Nephridia**:
- There are three main types of nephridia found in earthworms:
- **Septal Nephridia**: These are located between the segments of the earthworm.
- **Pharyngeal Nephridia**: These are found in the pharyngeal region.
- **Integumentary Nephridia**: These are located in the skin of the earthworm.

3. **Analyze the Options**:
- The options given are:
- **Septal Nephridia**: Present in earthworms.
- **Pharyngeal Nephridia**: Present in earthworms.
- **Integumentary Nephridia**: Present in earthworms.
- **Protonephridia**: This type is not found in earthworms.

4. **Conclusion**:
- Since septal, pharyngeal, and integumentary nephridia are all present in earthworms, the type of nephridia that is not found in earthworms is **Protonephridia**.

### Final Answer:
**Protonephridia** are not found in earthworms.

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