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Dolania americana
''Dolania americana'' is a species of mayfly in the family Behningiidae. It is the only species in the genus ''Dolania''. It is found in the southeastern United States, as far south as Florida, and is generally uncommon. The adult insects emerge before dawn in early summer, mate and die within the space of about thirty minutes. The female deposits her eggs in the water and dies within five minutes of emergence, believed to be the shortest adult lifespan of any insect.
==Description==
The adult ''Dolania americana'' has a pale brownish-purple body and membranous wings that are in length. The legs of both male and females are vestigial, thin and twisted, but appear to retain some function. The cerci are longer and more robust than the terminal filaments. The penes of the male are twice as long as the genital forceps.〔
The body of the nymph is cylindrical with a flattened head. The antennae are on the ventral side of the head and the small mandibles do not bear any tusks. The sides of the head and the prothorax are spiny. None of the legs have claws; the front pair are palp-like and the remaining pairs are spiny and protect the gills, which are on the ventral surface of the abdomen. The abdomen is densely covered with bristles. The first abdominal segment has a pair of single gills and the other segments bear further pairs of rather smaller, bifid gills. There are three tail filaments at the tip of the abdomen.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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