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Ephemera lineata (Striped Mayfly)

Ephemera lineata is the rarest of the British Ephemeridae.  It is currently known from the River Thames and the River Wye (Monmouthshire) but may occur in other watercourses.  Nymphs of this species live in the pools and margins of large rivers where they dig into the substrate to form a tubular burrow.  They use their gills to force the water through this burrow and the nymphs feed by filtering or collecting fine particulate organic detritus from the water column.  Ephemera lineata has a two-year life cycle, however some populations may have an annual lifecycle.  Adults are usually seen in July.

 


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Emergence of the adults probably takes place at dusk or dawn on the surface of the water or occasionally on a stick, stone or plant stem partially or entirely out of the water.