像大多数水生昆虫一样，蜉蝣在成长过程中换羽。
这只3英寸(7.6厘米)长的昆虫——类似于现代的蜉蝣类——在迈开腿起飞之前已经在泥土里待了足够长的时间，留下了一个完美的印迹。
The 3-inch (7.6-centimeter) insect-which resembles a modern mayfly-likely stayed in the mud long enough to move its leg before flying off, leaving a perfect impression.
从虫子的外形看，堪萨斯州大学昆虫学家迈克尔·s·恩格尔认定它为一种最早的飞虫——蜉蝣类。
From the shape of the insect, Michael s. Engel, an entomologist at the University of Kansas, identified it as a mayfly, one of the first groups of flying insects.
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