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Siphlonurus armatus (Scarce summer mayfly)

There are few published records Siphlonurus armatus.  Nymphs of this species typically live in the pools and margins of rivers and streams, or in standing waters.  The large nymphs are good swimmers and typically swim in short, darting bursts.  They feed by gathering or collecting fine particulate organic detritus from the sediment.  There is probably one generation a year, which overwinters as eggs and emerges between May and August.

 


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Emergence of the adults typically takes place during daylight hours and males of this species can be found swarming at dawn and dusk.