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Dolania is a monotypic genus of mayfly in the family Behningiidae containing the single species Dolania americana, also known as the American sand-burrowing mayfly. [3] It is found in the southeastern United States, as far south as Florida, and is generally uncommon. [ 4 ]
As of 2012, over 3,000 species of mayfly in 42 families and over 400 genera are known worldwide, [50] [51] including about 630 species in North America. [52] Mayflies are an ancient group of winged (pterygote) insects.
The eggs are laid by the female dipping her abdomen into the surface of the water. This mayfly usually has a two-year life cycle (one- and three-year cycles have also been recorded), [1] with the nymphal stage lasting for most of this period and the adult being on the wing briefly in summer.
Hexagenia limbata, the giant mayfly, is a species of mayfly in the family Ephemeridae. It is native to North America where it is distributed widely near lakes and slow-moving rivers. [ 2 ] The larvae, known as nymphs, are aquatic and burrow in mud and the adult insects have brief lives.
Hexagenia bilineata is a species of mayfly in the family Ephemeridae. It is native to North America where it is found in the Upper Mississippi Valley. Sometimes adults of this mayfly are so abundant as to cause a nuisance because of their enormous numbers. The larvae are aquatic and burrow in mud and the adult insects have brief lives.
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The life expectancy of people with diabetes, which is 9.3% of the U.S. population, is reduced by roughly 10–20 years. [128] [129] People over 60 years old with Alzheimer's disease have about a 50% life expectancy of 3–10 years. [130]