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Caenis beskidensis (Anglers' curse)

Caenis beskidensis was first recorded from the River Crûg, Powys in 1984.  Since then there have been no other records, however this may be as a result of under-recording due to the superficial resemblance of its nymphs to the common British species Caenis rivulorum.  Little is known about this species however it is likely that the nymphs live in the pools and margins of stony rivers and streams, in silt trapped between larger stones and gravel.    They 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 usually overwinters as nymphs and emerges between July and September.

 


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