British Insects: the Genera of Ephemeroptera

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L. Watson and M. J. Dallwitz

Cloeon Leach

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.


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’.

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