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Procloeon bifidum (Pale evening mayfly)

Procloeon bifidum is found throughout the British Isles, although it appears to have a very localised distribution.  Nymphs of this species live in pools and margins of rivers and streams where they swim in short, darting bursts amongst the substrate, or climb amongst the vegetation.  They feed by scraping algae from submerged stones and other structures, or by gathering or collecting fine particulate organic detritus from the sediment.

 

Little is known about the lifecycle of this species however in Central Europe there is more than one generation a year, one of which overwinters as eggs.  Adults of this species can be seen between April and October.

 


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Emergence of the adults probably takes place at the surface of the water during daylight hours, with the males swarming at dawn and dusk.