The legs are slender, weak and poorly sclerotised. The claws are pale, flimsy and underdeveloped. Fore legs of male elongated, used to grasp female in flight.
The wings are delicate and transparent, with characteristic net-like venation.
The antennae are very short
The mouthparts of adults are reduced, unsclerotised.
Ephemeroptera have cerci, tail-like structures composed of cilindrical segments