Select the incorrect statement regarding the cockroach .

Options

A. In females , the `7^(th)` sternum is boat - shaped.
B. Males bear a pair of short , threadlike anal styles which are absent in females.
C. In both sexes the `9^(th)` segment bears a pair of jointed filamentous structures called anal cerci.
D. The absomen in both males and females consists of 10 segments.

Answer

To solve the question, "Select the incorrect statement regarding the cockroach," we need to evaluate each of the provided statements about cockroaches.

### Step-by-Step Solution:

1. **Statement A**: "In female, the 7th sternum is boat-shaped."
- This statement is correct. The 7th sternum in female cockroaches is indeed boat-shaped, which helps accommodate the large ovaries.

2. **Statement B**: "Males bear a short thread-like anal style which are absent in the female."
- This statement is also correct. Male cockroaches have anal styles, which are absent in females. This feature helps in distinguishing between male and female cockroaches.

3. **Statement C**: "In both sexes, the 9th segment bears a pair of the jointed filamentous structure called anal saccae."
- This statement is incorrect. The anal saccae are actually found in the 10th segment, not the 9th segment. Therefore, this statement is false.

4. **Statement D**: "The abdomen in both male and female consists of 10 segments."
- This statement is correct. Both male and female cockroaches have an abdomen consisting of 10 segments.

### Conclusion:
The incorrect statement regarding the cockroach is **Statement C**.