British Insects: the Genera of Ephemeroptera
Imago. The compound eyes rounded.
Wings fringed only in sub-imagines. Fore-wings with veins M1 and Cu1 sub-parallel basally; with R5 and R4 joined basally. Hind-wings present. The hind-wing costa smoothly curved. Hind tarsi with 4 moveable segments.
The abdomen with three tails. The lobes of the penis without recurved appendages.
Nymph. Gills mostly lying on the upper surface of the abdomen; not fringed with filaments on both sides.
Classification. Superfamily Baetoidea. Family Ephemerellidae.
British representation. 2 species; E. ignita (Blue Winged Olive or B.W.O. Dun and male Spinner, Sherry Spinner female), and E. notata (Yellow Evening Dun and Spinners).
To view illustrations with legends giving names in current use, go to the interactive key. This also offers full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa, as well as source references and other relevant material.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. British insects: the genera of Ephemeroptera. Version: 29th December 2011. http://delta-intkey.com’.