Superfamily
Ephemerelloidea
Drunella coloradensis. Photo: (c) Bob Henricks, some rights reserved (CC BY-SA)
Ephemerelloidea is a superfamily of mayflies in the suborder Pannota. It is a basal group of mayflies with a worldwide distribution. Members of this super-family can be distinguished from those of Caenoidea by the fact that the gills of the nymphs are not filamentous.