Marine annelids with parapodia that bear setae are

Options

A. polycheates
B. oligocheates
C. hirudineans
D. archiannelids

Answer

To solve the question regarding marine annelids with parapodia that bear setae, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for marine annelids that possess parapodia and setae.

2. **Define Key Terms**:
- **Annelids**: A phylum of segmented worms, which includes various classes.
- **Parapodia**: Unjointed appendages found in certain annelids, primarily used for locomotion.
- **Setae**: Small bristle-like structures that aid in movement and provide friction.

3. **Identify Relevant Classes of Annelids**:
- The main classes of annelids include Polychaeta, Oligochaeta, and Hirudinea.
- **Polychaeta**: This class is characterized by the presence of parapodia and setae. They are mostly marine.
- **Oligochaeta**: This class includes earthworms, which do not have parapodia.
- **Hirudinea**: This class includes leeches, which also lack parapodia.

4. **Focus on Polychaeta**:
- Within the Polychaeta class, we can identify specific examples such as the genus **Nereis**.
- Nereis has parapodia on its sides that assist in locomotion and is equipped with setae.

5. **Conclusion**: Based on the characteristics of the classes, the marine annelids with parapodia that bear setae are classified under **Polychaeta**, specifically exemplified by the genus **Nereis**.

### Final Answer:
Marine annelids with parapodia that bear setae are **Polychaeta**, specifically the genus **Nereis**.

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