Which one belongs to hemichordata

Options

A. Salpa
B. Balanoglossus
C. Petromyzon
D. Myxine

Answer

To determine which organism belongs to the phylum Hemichordata, we can analyze the options provided: Cellpa, Belanoglossus, Petromyzon, and Myxin.

### Step-by-Step Solution:

1. **Understand the Phylum Hemichordata**:
- Hemichordata is a separate phylum that includes marine organisms known for their worm-like shape and specific body structure.

2. **Identify the Options**:
- **Cellpa**: This is not a recognized organism in biological taxonomy.
- **Belanoglossus**: This is a well-known genus within the phylum Hemichordata.
- **Petromyzon**: Commonly known as lampreys, these belong to the phylum Chordata.
- **Myxin**: This refers to hagfish, which also belong to the phylum Chordata.

3. **Analyze Each Option**:
- **Cellpa**: Not relevant to Hemichordata.
- **Belanoglossus**: Confirmed to belong to Hemichordata.
- **Petromyzon**: Confirmed to belong to Chordata.
- **Myxin**: Confirmed to belong to Chordata.

4. **Conclusion**:
- The only organism from the options that belongs to Hemichordata is **Belanoglossus**.

### Final Answer:
**Belanoglossus** belongs to Hemichordata.

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