In the morphology of cockroaches, the short, thread-like structures known as anal styles are found in:

Step-by-step solution

In cockroaches, sexual dimorphism is evident in the abdominal appendages. Males bear a pair of short, thread-like anal styles which are absent in females. In both sexes, the 10th segment bears a pair of jointed filamentous structures called anal cerci. Therefore, anal styles are found exclusively in male cockroaches. Answer: Male cockroaches only