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Caenis pusilla (Anglers' curse)

Caenis pusilla was first recorded from the River Itchen, Hampshire in the early 1980s.  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.  Nymphs of this species live in the pools and margins of stony rivers and streams.  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 is one generation a year, which usually overwinter as nymphs and emerges between June and July.

 


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Emergence of the adults typically takes place partially or entirely out of the water on a stick, stones or plant stem.