Which of the following features is used to identify a male cockroach from a female cockroach

Options

A. Presence of anal cerci
B. Forewings with darker tegmina
C. Presence of caudal styles
D. Presence of a boat shaped sternum on the 9th abdominal segment

Answer

To identify a male cockroach from a female cockroach, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Sexual Dimorphism**:
- Sexual dimorphism refers to the differences in characteristics between male and female cockroaches. This means that certain features can help distinguish between the two sexes.

2. **Analyzing the Given Options**:
- The question provides several features to consider. We need to evaluate each option to see which one is unique to male cockroaches.

3. **Evaluating Option A: Presence of Annalserci**:
- Annalserci are present in both male and female cockroaches. They are located in the 10th abdominal segment and are used for detecting vibrations. Therefore, this feature does not distinguish male from female cockroaches.

4. **Evaluating Option B: Four Wings with Darker Tegmina**:
- The four wings, also known as tegmina, are dark brown and cover the hind wings in both male and female cockroaches. Since this feature is not exclusive to males, it cannot be used for identification.

5. **Evaluating Option C: Presence of Caudal Stiles**:
- Caudal stiles, also known as anal styles, are found only in male cockroaches. They are located in the 9th abdominal segment and play a role in motion detection. This feature is unique to males and can be used to distinguish them from females.

6. **Evaluating Option D: Presence of Boat-Shaped Sternum on the 9th Abdominal Segment**:
- The boat-shaped sternum is present in both male and female cockroaches. Thus, it does not serve as a distinguishing feature.

7. **Conclusion**:
- After evaluating all the options, the correct answer is **Option C: Presence of Caudal Stiles**, which is unique to male cockroaches.