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The main distribution of this species is in the south and west of
Britain and Warwickshire is more or less on the boundary of its range.
Prior to 1991 there were a few records confined to the rivers Blythe
and Stour; 1992 marked a turning point. That year vigorous populations
were found on the Stour and Blythe and a new population on the upper
reaches of the Leam.
In 2000 it was recorded on the River Dene at Combrook. In 2003 it was
recorded close to
Lighthorne
on an upper tributary of Thelsford Brook and in 2004 on a small unnamed
stream on the Warkwickshire/Oxfordshire boarder close to Shotteswell
and Paddle Brook, Stretton on fosse.
The species
continues its slow expansion of range. However, this species remains a
fairly rare and locally distributed one in the county.
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