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Ephemerella notata (Yellow hawk)

Ephemerella notata is less common than Serratella ignita, however its range has spread northwards considerably over the past 25 years.  Nymphs of this species live in rivers and streams either on in-stream vegetation or amongst the sand and gravel on the bed.  They are usually found clinging to, or crawling amongst submerged plants and stones, although they may swim in short bursts if disturbed.  The nymphs feed by collecting or gathering fine particulate organic detritus from the sediment. 

 

There is one generation a year, which can overwinter either as eggs or as nymphs and emerges between May and June.

 


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Males of this species swarm at dusk and once mated, the female produces an egg mass which she holds under her tail.  This egg mass is released as the insect flies above the water.