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Kageronia fuscogrisea (Brown May dun)

Kageronia fuscogrisea is a highly localised species.  It is most common in Ireland, however it can also be found in Dumfries and Galloway and occasionally in the catchment of the River Thames.  Nymphs of this species live chiefly in the riffle sections of larger rivers although they are also found along the wave lashed shores of calcareous lakes and, atypically for Heptageniidae, amongst stands of macrophytes in standing waters.  They feed either by scraping periphyton from the substrate or by gathering fine particulate organic detritus from the sediment.  The nymphs usually swim in short bursts, interspersed with periods of clinging to submerged plants and stones. 

 

There is one generation a year, which usually overwinters as nymphs and emerges between May and June.  Males swarm throughout the day.

 


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