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Mayfly Species Siphlonurus alternatus (Gray Drake)

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This species occasionally produces important spinner falls. Its spinners may join the swarms of Siphlonurus quebecensis or Siphlonurus rapidus, amplifying the importance of all three species.  

Where & When

Regions: East, Midwest

Time Of Year (?): Early May through early September; peaking from late June through July

Spinner Behavior

Time Of Day: Evening

Habitat: Riffles

Pictures of 1 Mayfly Specimen in the Species Siphlonurus alternatus:

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