In distinguishing between a true water bug and a mislabeled cockroach pest, what is the primary difference in foreleg function?

Answer

Water bug forelegs are raptorial for grasping; cockroach legs are adapted for running

A stark physical difference used to separate the true aquatic water bugs (Belostomatidae) from terrestrial pests mistakenly called water bugs, such as cockroaches, lies in the adaptation of their forelegs. The true water bug possesses highly modified raptorial appendages specifically designed for capturing and holding prey securely, featuring stout structures for grasping. In sharp contrast, the cockroach, which is primarily a terrestrial insect, has forelegs adapted for running and walking, lacking the specialized grasping mechanism. Furthermore, the mouthparts differ fundamentally: water bugs have a piercing-sucking rostrum, whereas cockroaches possess chewing mandibles, highlighting completely divergent feeding strategies based on their distinct habitats.

In distinguishing between a true water bug and a mislabeled cockroach pest, what is the primary difference in foreleg function?

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