Which of the following animals belongs to Urochordata ?

Options

A. Herdmania
B. Balanoglossus
C. Amphioxus
D. Petromyzon

Answer

To determine which animal belongs to the Urochordata class, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Classification**: Urochordata is a subphylum within the phylum Chordata. Members of Urochordata are also known as tunicates or sea squirts.

2. **Identify the Options**: The options provided are:
- A. Herdmania
- B. Balenoglossus
- C. Amphioxus
- D. Petromyson

3. **Analyze Each Option**:
- **A. Herdmania**: This is a type of tunicate, which belongs to the Urochordata subphylum. They are sedentary and often found attached to substrates in marine environments.
- **B. Balenoglossus**: This belongs to the phylum Hemichordata, not Urochordata.
- **C. Amphioxus**: This is a lancelet and belongs to the subphylum Cephalochordata, not Urochordata.
- **D. Petromyson**: This is a type of jawless fish (lamprey) and belongs to the subphylum Vertebrata, not Urochordata.

4. **Conclusion**: Based on the analysis, the only animal that belongs to Urochordata is **A. Herdmania**.

### Final Answer:
**A. Herdmania**