What family includes mayflies that are often collected for fishing bait?

The family that includes mayflies often collected for fishing bait is Leptophlebiidae. This family is known for its species that undergo a specific life cycle, with nymphs that live in freshwater environments and are often sought after by anglers for their effectiveness in attracting fish.

Leptophlebiidae mayflies are characterized by their unique features, such as long tails and a delicate body structure. They are commonly found in various freshwater habitats, making them accessible and popular among fishers looking to catch trout and other freshwater species. Their presence in both the nymph and adult stages provides an excellent option for bait, as many fish are drawn to the natural movements of these insects.

The other families listed, such as Isonychiidae and Polymitarcyidae, contain mayflies that may also have fishing importance, but they are less commonly collected for bait compared to Leptophlebiidae. Hemiptera, on the other hand, is an entirely different order that includes insects like true bugs, which are not related to mayflies and are not used as fishing bait. Thus, the most accurate choice that aligns with the context of mayflies collected for fishing is Leptophlebiidae.