''Caenis'' is a genus of mayflies. They are very small in size, sometimes with a body of only an 1/8 of an inch ().

Distribution and ecology

''Caenis'' is one of the most abundant mayfly genera of the Holarctic. Larvae can occur in high densities on the bottoms of shallow ponds and lakes up to an altitude of 1800 meters in the

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Densities of 700-1700 larvae per square meter have been reported for ''C. luctuosa'' and ''C. horaria'' on bottoms covered with organic detritus or decaying leaves. Densities on mineral sediments are an order of magnitude lower (4-330 animals per square meter).

Species

*'' Caenis amica'' Hagen, 1861 *'' Caenis anceps'' Traver, 1935 *'' Caenis arwini'' McCafferty & Davis, 2001 *'' Caenis bajaensis'' Allen & Murvosh, 1983 *'' Caenis candida'' Harper & Harper, 1981 *'' Caenis diminuta'' Walker, 1853 *'' Caenis hilaris'' (Say, 1839) *'' Caenis horaria'' (Linnaeus, 1758) *'' Caenis latipennis'' Banks, 1907 *'' Caenis luctuosa'' (Burmeister, 1839) *'' Caenis macafferti'' Provonsha, 1990 *'' Caenis punctata'' McDunnough, 1931 *'' Caenis tardata'' McDunnough, 1931 *'' Caenis youngi'' Roemhild, 1984

Varia

Imitations of this mayfly in hook sizes as small as # 28 are used for fly-fishing. Tying fly imitations this small is difficult, hence the nickname "Anglers Curse."

References

Mayfly genera {{mayfly-stub