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Procloeon pennulatum (Large spurwing)

Procloeon pennulatum is known from England and Wales, but is rarely encountered in Scotland and absent from Ireland.  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.

 

There is one generation a year, which overwinters as eggs, however some workers have suggested that there may be a second generation in the summer.  Adults of this species can be seen between May 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 dusk.  Once mated, the female probably lays her 2500 eggs in either a single batch or several batches by dipping the tip of her abdomen onto the water surface.