Ctenophora shows affinity with

Options

A. Cnidaria
B. Aschelminth
C. Cephalopoda
D. Tuberlaria

Answer

To determine the affinity of Ctenophora, we can analyze the characteristics shared with the given options.

### Step-by-Step Solution:

1. **Understanding Ctenophora**: Ctenophora, commonly known as comb jellies, are marine invertebrates known for their unique locomotion using cilia.

2. **Analyzing the Options**:
- **A. Nidaria**: This group includes jellyfish, corals, and sea anemones. They share several similarities with Ctenophora.
- **B. Eschelmenth**: This is not a recognized phylum in modern taxonomy and thus is not relevant.
- **C. Cephalopoda**: This group includes squids and octopuses, which are mollusks and have significant differences from Ctenophora.
- **D. Tubularia**: This is a genus within the Cnidaria phylum, but it is not a separate group like the others.

3. **Identifying Shared Characteristics**:
- Both Ctenophora and Cnidaria exhibit radial symmetry, meaning their body parts are arranged around a central axis.
- They both have a gastrovascular cavity for digestion and nutrient distribution.
- Neither group possesses a true coelom (body cavity).
- Both groups have tentacles for capturing prey and sensory structures like statocysts.
- The gonads in both groups are endodermal in origin.

4. **Conclusion**: Given these shared characteristics, Ctenophora shows the closest affinity with **A. Nidaria**.

### Final Answer:
Ctenophora shows affinity with **A. Nidaria**.

---