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Caenis pseudorivulorum (Anglers' curse)

Caenis pseudorivulorum was first recorded from the River Derwent, Yorkshire in 1984.  Since then there have been few 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 where they feed by collecting or gathering fine particulate organic detritus from the sediment.  There are possibly two generations per year - a slow growing winter generation and a much faster summer generation.  This results in a long flight period with adults being seen from the middle of June to the end of October.

 


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