Which family has front legs not scoop-like, unlike Corixidae?

Which family has front legs not scoop-like, unlike Corixidae?

• A. Notonectidae (Backswimmers)
• B. Corixidae (Water Boatmen)
• C. Nepidae (Waterscorpions)
• D. Belostomatidae (Giant Water Bugs)

Answer: (A)

This question is about how foreleg shape in aquatic true bugs relates to feeding habits. In Corixidae, the forelegs are broad and scoop-like, a specialization that helps them gather food from the water surface or substrate. The family in question lacks that scoop-like modification—the front legs are not broadened for scooping. Instead, they are more standard and not adapted for scooping, reflecting a different approach to feeding and prey handling. The other two families mentioned have clearly raptorial, grasping forelegs used to seize prey, which is a different evolutionary path from both scoop-like forelegs and non-scoop-like forelegs. So the family with front legs that are not scoop-like is Notonectidae.

This question is about how foreleg shape in aquatic true bugs relates to feeding habits. In Corixidae, the forelegs are broad and scoop-like, a specialization that helps them gather food from the water surface or substrate. The family in question lacks that scoop-like modification—the front legs are not broadened for scooping. Instead, they are more standard and not adapted for scooping, reflecting a different approach to feeding and prey handling. The other two families mentioned have clearly raptorial, grasping forelegs used to seize prey, which is a different evolutionary path from both scoop-like forelegs and non-scoop-like forelegs. So the family with front legs that are not scoop-like is Notonectidae.