Which is marine

Options

A. Pheretima communissima
B. Eisenia
C. Pontonbdellal Nereis
D. Hirudo

Answer

To determine which organism from the given options is marine, we will analyze each option based on their habitats.

### Step-by-Step Solution:

1. **Understanding Marine Habitat**:
- Marine habitats refer to environments that are found in salty water, such as oceans and seas.

2. **Analyzing the Options**:
- **Option A: Ferritima (Earthworm)**:
- Ferritima is commonly known as the earthworm. Earthworms typically live in moist or damp soil, not in aquatic environments. Therefore, this option is incorrect.

- **Option B: Communisima (Euglenia)**:
- Communisima refers to a type of earthworm, specifically known as manure worms. These worms thrive in decaying organic matter and rooting vegetation, which means they are also not found in marine habitats. Thus, this option is incorrect.

- **Option C: Nereus**:
- Nereus is a genus of polychaete worms. Polychaetes are known to inhabit marine environments, and Nereus species are predominantly found in salty water. Therefore, this option is correct as it is marine.

- **Option D: Hirudo (Leeches)**:
- Hirudo, commonly known as leeches, primarily inhabit freshwater environments or terrestrial habitats. They are not marine organisms, making this option incorrect.

3. **Conclusion**:
- Based on the analysis, the organism that is marine is **Nereus**.

### Final Answer:
**Nereus** is the marine organism among the options provided.