Skip to main content

Ameletus inopinatus (Upland summer mayfly)

Ameletus inopinatus has a limited distribution in Northern England and Scotland.  It is thought that the distribution of this species will shrink as water temperatures increase due to climate change.  Nymphs of this species typically live in upland streams (above 300 metres), but are also found in some Highland lochs in Scotland.  The 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 one generation a year, which usually overwinters as nymphs and emerges between May and early August.

 


J


F


M


A


M


J


J


A


S


O


N


D


 


 


 


 


 


 


 


 


 


 


 


 

 

Emergence of the adults typically takes place during daylight hours and males of this species can be found swarming in the afternoon.