Ephemeridae

Ephemeridae is a family of mayflies with about 150 described species found throughout the world except Australia and Oceania.

==Description== Ephemerids are generally quite large mayflies (up to 35 mm) with either two or three very long tails. Many species have distinctively patterned wings. They breed in a wide range of waters, usually requiring a layer of silt as the nymphs have strong legs which are adapted for burrowing (the group is sometimes known as burrowing mayflies).