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| Insects of Britain and Ireland: the genera of Ephemeroptera |
Imago. The compound eyes rounded.
Fore-wings with R5 detached basally from R4. Hind-wings absent. The hind-wings of the female imagines more than one fifth the length of the fore-wings. Hind tarsi with 4 moveable segments. The first segment of the hind tarsus about twice as long as the second.
The abdomen with two tails.
Nymph. The outer tails hairy on the inner side only. Gills mostly at the sides of the abdomen; not fringed with filaments on both sides.
Classification. Superfamily Baetoidea. Family Baetidae.
British representation. 2 species; C. dipterum (Pond Olive or Lake Olive Dun, Pond Olive male Spinner, Apricot Spinner female), and C. simile.
Illustrations. • Caenis macroura, Cloeon dipterum, Rhithrogena semicolorata: Stephens VI, 1835. EPHEMEROPTERA. 1, Caenis macroura Stephens; 2, Rhithrogena semicolorata (Curtis); 3, CLOEON dipterum (Linn.). From Stephens vol. VI, 1835.
We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, 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. See also Guidelines for using data taken from Web publications.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. Insects of Britain and Ireland: the genera of Ephemeroptera. Version: 11th April 2022. delta-intkey.com’.
