An example of agnatha (jawless vertebrate)/cyclostomate is

Options

A. Labeo rohita
B. Scolioden
C. Rana tigrina
D. Petromyzon.

Answer

To answer the question "An example of agnatha (jawless vertebrate)/cyclostomate is," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Agnatha**:
- Agnatha refers to a group of jawless vertebrates. This class includes organisms that do not have jaws, which distinguishes them from other vertebrates.

2. **Identifying Cyclostomata**:
- Cyclostomata is a subclass within Agnatha. It includes modern jawless fish, such as lampreys and hagfish.

3. **Examples of Agnatha**:
- We need to find specific examples of organisms that belong to the Agnatha class.
- The transcript mentions "petromyson," which is a type of lamprey, and is classified under Cyclostomata.

4. **Confirming the Correct Example**:
- Among the examples provided in the transcript, "petromyson" is highlighted as belonging to Cyclostomata and is a well-known example of an agnathan.

5. **Conclusion**:
- Therefore, the correct answer to the question is "petromyson."

### Final Answer:
An example of agnatha (jawless vertebrate)/cyclostomate is **petromyson**.

---