Information on mayflies (Ephemeroptera) for scientists and the layman.

Information on hundreds of species, including distribution maps and county checklists.

An introduction to biology, classification, and ecology of mayflies, the Ephemeroptera.

Taxonomy of the mayflies, with a brief description and list of references, from Tree of Life.

Mayfly research and resources at Purdue.

Introduction from John R. Meyer's Entomology class.

Fact sheet on Hexagenia spp. from Ohio State University.

Stories, pictures, and videos of the mass emergence of shadflies (also known as mayflies, dunes, and dayflies) in North Bay, Ontario, Canada.