Which one forms a connecting link between annelida and arthropoda

Options

A. Peripatus
B. Chaetopterus
C. Limulus
D. Bonellia.

Answer

To determine which organism forms a connecting link between the phyla Annelida and Arthropoda, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of a Connecting Link**:
- A connecting link is an organism that exhibits characteristics of two different groups, providing insight into their evolutionary relationship.

2. **Identify the Characteristics of Annelida**:
- Annelids are segmented worms. They exhibit body segmentation and possess structures such as nephridia for excretion.

3. **Identify the Characteristics of Arthropoda**:
- Arthropods are characterized by jointed appendages (legs) and a chitinous exoskeleton.

4. **Evaluate the Given Options**:
- **Peripatus**: This organism exhibits both segmentation (like annelids) and jointed appendages (like arthropods).
- **Chaetopterus**: This is an annelid worm (not a connecting link).
- **Limulus**: Known as the king crab, it belongs to Arthropoda (not a connecting link).
- **Bonellia**: A marine worm that is also part of Annelida (not a connecting link).

5. **Conclusion**:
- Based on the characteristics, **Peripatus** is the organism that forms a connecting link between Annelida and Arthropoda due to its shared features of both phyla.

### Final Answer:
**Peripatus** is the connecting link between Annelida and Arthropoda.