Which of the following is the larva of Petromyzon ?

Options

A. Ammocoete
B. Bipinnaria
C. Tadpole
D. Tornaria

Answer

To determine the larva of Petromyzon, we will analyze the options provided in the question step by step.

### Step-by-Step Solution:

1. **Identify the Organism**: Petromyzon refers to a genus of jawless fish commonly known as lampreys. Understanding the life cycle of lampreys is essential to identify their larval form.

2. **Examine the Options**: The options provided are:
- A) Amocete
- B) Bipanaria
- C) Tadpole
- D) Tornaria

3. **Analyze Each Option**:
- **Option A: Amocete**: This is indeed the larval stage of lampreys, including Petromyzon. Amocetes are known for their eel-like appearance and live in freshwater environments.
- **Option B: Bipanaria**: This is incorrect as Bipanaria is the larval stage of starfish, not related to lampreys.
- **Option C: Tadpole**: This option is also incorrect since tadpoles are the larval form of frogs, which are amphibians and not related to lampreys.
- **Option D: Tornaria**: This is incorrect as Tornaria is the larval form of acorn worms, which are a different group of animals altogether.

4. **Conclusion**: After analyzing all the options, we find that the correct answer is **Option A: Amocete**, as it is the larval stage of Petromyzon (lampreys).

### Final Answer:
The larva of Petromyzon is **Amocete**.

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