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.
研究小组发现，尽管这些蛛网有在强度和尺寸点像蜘蛛侠织出的蛛网，但是这些达尔文吠蛛只是用他们来捕食像蜉蝣和蜻蜓这样的小型飞行昆虫。
Despite spinning webs of Spider-Man-like size and strength, the Darwin's bark spider USES them to feed mainly on small fry-insects such as mayflies and dragonflies, the team found.
他们也发现河水的通气性良好，重要的食物链昆虫像是蜉蝣、石蝇和石蛾的族群数都增加了。
They also found that the water became well aerated and that populations of important food-chain insects such as mayflies, stoneflies and caddisflies grew.
他们也发现河水的通气性良好，重要的食物链昆虫像是蜉蝣、石蝇和石蛾的族群数都增加了。
They also found that the water became well aerated and that populations of important food-chain insects such as mayflies, stoneflies and caddisflies grew.
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