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Caenis rivulorum (Anglers' curse)

Caenis rivulorum is the most common and widely distributed of the British Caenidae.  It can be found throughout the British Isles and Ireland, although it has a relatively localised distribution in the South East of England.  Nymphs of this species live in the pools and margins of stony rivers and streams, where they live in silt trapped between larger stones and gravel.  The nymphs are poor swimmers but are adapted for moving amongst the sediment.  They feed by collecting or gathering fine particulate organic detritus from the sediment. 

 

There is one generation a year which overwinters as nymphs and emerges as adults between May and September.

 


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Emergence of the adults probably takes place partially or entirely out of the water on a stick, stones or plant stem at dusk or dawn.