Which of the following is a hemichordate

Options

A. Herdmania
B. Doliolum
C. Balanoglossus
D. Branchiostoma

Explanation

To determine which of the given options is a hemichordate, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Hemichordates**: Hemichordates are a group of marine animals that are characterized by the presence of a notochord, which is a flexible rod-like structure that provides support. They are part of the deuterostome clade and are closely related to echinoderms and chordates.

2. **Identify the Options**: The options provided are:
- Hadmania
- Doliolum
- Blenuclosis
- Branchiostoma

3. **Research Each Option**:
- **Hadmania**: This is a genus of hemichordates.
- **Doliolum**: This is a genus of tunicates, not hemichordates.
- **Blenuclosis**: This does not correspond to any known group of hemichordates or related animals.
- **Branchiostoma**: This is a genus of lancelets, which are part of the phylum Chordata, not hemichordates.

4. **Conclusion**: Based on the classification and characteristics of the options, **Hadmania** is the only option that is a hemichordate.

### Final Answer:
**Hadmania** is a hemichordate.

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