Ephemeroptera

通用名稱：

Mayflies

分配：

Every continent except Antarctica

棲息地：

Freshwater habitats in decaying vegetation, under rocks or in sediment (nymph)

飲食：

Nymphs feed on detritus,algae and diatoms; adults do not feed

全球物種數量：

3000

香港的物種數量：

形態學
（如何識別它們）：

-Long thin abdomen
-2 or 3 threadlike tails
-2 large compound eyes and 3 ocelli (simple eyes)
-Large veiny membranous triangular forewings
-Small or absent rounded hindwings
-Short and bristle-like antennae

圖表

你可知道？

The mayfly population often matures all at once. These mayfly adults do not live for long (rarely more than 24hours) and have non-functional mouthparts and digestive tracts. Mayfly adults' only purpose is to mate and during that day, swarms of mayflies can be seen emerging from the water. After mating, the adults will die and females fall onto the water surface. Their fertilised eggs sink into the water and the cycle repeats.