The YNU recorder for mayflies (Ephemeroptera) is Mrs Sharon Flint  e-mail:

Ephemeroptera meaning (Greek ephemeros = lasting a day; pteron = wing)

Ephemeroptera are Hemimetabolous insects, i.e. have incomplete metamorphosis, with the larvae resembling the adult in appearance. The life cycle is divided into the four stages, egg, larvae and, uniquely, two adult stages. The subimago (Dun) which emerges from the final larval stage, moults, usually within 24 hours to become the imago (Spinner).

Reproduction and dispersal occur during the winged adult stage in the life cycle.

The following references are useful identification keys and some contain extensive ecological and distributional information.

Elliot, J.M. & Humpesch, U.M. (1983) A Key to the Adults of the British Ephemeroptera with notes on their ecology. Scientific Publications of the Freshwater Biological Association No. 47

Elliot, J.M. & Humpesch, U.M. (2010) Mayfly Larvae (Ephemeroptera) of Britain and Ireland: Keys and a Review of their Ecology. Scientific Publications of the Freshwater Biological Association. No. 66

Macadam, C & Bennet, C (2010) A Pictorial Guide to British Ephemeroptera. Field Studies Council.

The National Mayfly recording scheme can be viewed by clicking on the link below:

Sharon Flint is happy to receive specimens for identification. Identifications will be put into the NBN for the national recorders verification. Records of Mayflies can also be uploaded into:


Insect Section Menu

Grasshoppers and Crickets

The Grasshoppers & Crickets sub-section of the YNU


Mayfly recording in Yorkshire

Plant Galls

Plant gall recording in the YNU

Isopoda, Myriapoda and Pseudoscorpiones

Woodlice, millipedes, centipedes and false scorpions


Insect recording in Yorkshire

Insect Events

List of upcoming events

Insect Section News

News from the YNU's Insect Section


Caddisflies or Trichoptera, (meaning, from the Greek trichos a hair and pteron a wing; hairy-wing

Bees, wasps and ants

The Bees, Wasps and Ants Sub-Section of the YNU.


StoneStoneflies, belonging to the Insect order Plecoptera, are so called because the adults of th

Parasitic Wasps

The Parasitic Wasp Sub-Section of the YNU.


Recording sawflies in Yorkshire


The beetle sub-section of the YNU.

Butterflies and Moths

The butterflies and moths sub-section of the YNU.

Hemiptera, Neuroptera & Odonata

Plant bugs, lacewings, dragonflies and damselflies


Diptera recording in Yorkshire

Main Contacts

Chairman and Secretary of the Entomological Section