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Ads. Dobsonfly, common name for any member of a family of often large, stout-bodied, net-winged aquatic insects. They are found nearly worldwide. Larvae are called hellgrammites or dobsons and are sometimes used as fishing bait. In midsummer, dobsonfly females lay eggs on leaves or rocks overhanging water, into which the larvae drop when hatched. The larvae are fierce predators, feeding on small aquatic animals; they are sometimes cannibalistic. The larvae remain in the water for up to three years, sometimes reaching a length of 5 cm (2 in).
Mayflies also known as shadflies or fishflies in Canada, are aquatic insects belonging to the order Ephemeroptera. This order is part of an ancient group of insects termed the Palaeoptera, which also contains dragonflies and damselflies. Over 3,000 species of mayfly are known worldwide, grouped into over 400 genera in 42 families. Mayflies are relatively primitive insects and exhibit a number of ancestral traits that were probably present in the first flying insects, such as long tails and wings that do not fold flat over the abdomen.