Aquatic annelids like______,posses lateral appendages, parapodia which help in swimming.

Options

A. Nereis
B. Pheretima
C. Hirudinaria
D. Both nereis and Hirudinaria

Explanation

To solve the question, we need to identify an aquatic annelid that possesses lateral appendages called parapodia, which assist in swimming.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for an example of an aquatic annelid that has parapodia for swimming.

2. **Identifying Aquatic Annelids**: We know that annelids are segmented worms, and some are aquatic. Examples include Neris and Herodinaria.

3. **Evaluating the Options**:
- **Option A: Neris** - Neris is an aquatic annelid known for having parapodia and setae, which aid in swimming. This option is likely correct.
- **Option B: Ferritema** - Ferritema is a terrestrial organism, not aquatic, so this option is incorrect.
- **Option C: Herodinaria** - Herodinaria lacks parapodia, making it unsuitable for this question, so this option is also incorrect.
- **Option D: Both Neris and Herodinaria** - Since Herodinaria is not an aquatic annelid with parapodia, this option is incorrect.

4. **Conclusion**: The only suitable answer is Option A, Neris, as it is an aquatic annelid with the required characteristics.

### Final Answer:
Aquatic annelids like **Neris** possess lateral appendages, parapodia, which help in swimming.