Hectrocotylised arm of Sepia is

Options

A. Right third
B. left third
C. Right fourth
D. Left Fifth

Answer

To answer the question about the hectocotylized arm of Sepia, we can break down the information step by step.

### Step-by-Step Solution:

1. **Understanding Sepia**:
- Sepia is the scientific name for the cuttlefish, which is a type of mollusk. It has a unique internal structure known as the cuttlebone.

2. **Anatomy of Sepia**:
- Cuttlefish have a total of 10 appendages: 8 arms and 2 longer tentacles. The arms are used for various functions, including capturing prey.

3. **Breeding Season Changes**:
- During the breeding season, male cuttlefish undergo anatomical changes. Specifically, one of their arms is modified for reproductive purposes.

4. **Identifying the Hectocotylized Arm**:
- The left fifth arm of male Sepia is modified into a specialized structure known as the hectocotylus. This arm is adapted for copulation.

5. **Function of the Hectocotylus**:
- The hectocotylized arm is used to store and transfer spermatophores (sperm packets) to the female cuttlefish. This process is crucial for reproduction.

6. **Conclusion**:
- Based on the information, the hectocotylized arm of Sepia is the left fifth arm.

### Final Answer:
The hectocotylized arm of Sepia is the **left fifth arm**.

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