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| Insects of Britain and Ireland: the genera of Ephemeroptera |
Ordella Campion
Imago. The compound eyes rounded.
Second antennal segment no more than twice as long as the first. Wings fringed in the imago. Fore-wings with R5 and R4 joined basally. Hind-wings absent. The fore-legs inserted relatively close together under the thorax. Hind tarsi with 4 moveable segments.
The abdomen with three tails.
Nymph. Gills mostly lying on the upper surface of the abdomen; not fringed with filaments on both sides.
Classification. Superfamily Baetoidea. Family Caenidae.
British representation. 5 species; C. horaria, C. luctuosa, C. macrura, C. rivulorum, C. robusta (all the Duns and Spinners colloquially named Angler’s Curse).
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’.
