The animal which does not show any metamorphosis of larval stage is

Options

A. Pheretima posthuma
B. Asterias
C. Musca domestica
D. Butterfly

Answer

To determine the animal that does not show any metamorphosis of the larval stage, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Metamorphosis**:
- Metamorphosis is a biological process where an animal undergoes significant physical changes after the embryonic stage. This is commonly seen in various species, especially insects.

2. **Analyzing the Options**:
- The options given are:
- Ferritima posthuma (earthworm)
- Asteris (starfish)
- Musca domestica (housefly)
- Butterfly

3. **Identifying Metamorphosis in Each Option**:
- **Ferritima posthuma (Earthworm)**: Earthworms do not undergo metamorphosis. They develop directly from the egg to a juvenile form without a larval stage.
- **Asteris (Starfish)**: Starfish exhibit a larval stage (bipinnaria) that undergoes metamorphosis to become an adult.
- **Musca domestica (Housefly)**: Houseflies undergo complete metamorphosis, which includes egg, larval (maggot), pupal, and adult stages.
- **Butterfly**: Butterflies undergo complete metamorphosis, transitioning from egg to larva (caterpillar), then to pupa (chrysalis), and finally to adult.

4. **Conclusion**:
- Based on the analysis, the only animal listed that does not exhibit any metamorphosis of the larval stage is **Ferritima posthuma** (earthworm).

### Final Answer:
The animal which does not show any metamorphosis of larval stage is **Ferritima posthuma**.

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