| Author | Macan, T.T. |
| Year | 1961 |
| Title | A Key to the Nymphs of the British Species of Ephemeroptera |
| Series | Scientific Publications |
| Type | Book/Report |
| How Complete | All the then known British species |
| Source | Scientific Publications, 20, 64pp, Freshwater Biological Association |
| Illustrations | Line drawings accomanpy text, vice county maps at the back |
| Review (by Malcolm Storey) | Dichotomous key to species with a line or two of notes on each. There follows a short chapter on life-histories with phenology diagrams and then vice county distribution maps |
| Examine |  Stereo Microscope |
| Specimen Preparation | Live specimens often have distinctive gis, but they may need to be killed for detailed examination of mouth parts or gill lamellae |
| Identification difficulty | Most of the difficulties lie in dissecting these fragile, pale coloured and often small insects |
