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Paraleptophlebia submarginata (Turkey brown mayfly)

Paraleptophlebia submarginata is found throughout the British Isles, but has not been recorded from Ireland.  The distribution is strongest in Central England and Wales but more localised populations are also found as far North as Thurso.  Wherever this species is found it is rarely present in large numbers - thorough searching of a site may only reveal a handful of specimens.  Nymphs of this species live chiefly in the pools and margins of rivers and stream, where they burrow into, and live in gravel, sand or mud on the bed of the watercourse or forage on moss covered stones.  The nymphs are poor swimmers but are adapted for burrowing and moving on moss covered stones.  They feed by filtering or gathering fine particulate organic detritus from the sediment.  There is one generation a year, which usually overwinters as nymphs and emerges between April and July.

 


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Emergence of the adults typically takes place partially or entirely out of the water on a stick, stone or plant stem during daylight hours.  The males of this species can be found swarming throughout the day, and often swarming continues until dusk.

 

Once mated, the female flies upstream and descends to the surface of the water where she releases around 1200 eggs in a single batch by dipping the tip of her abdomen into the water.  After releasing her eggs the spent female falls on to the surface.