14 June 2012 Last updated at 09:33 ET

Large alder sawfly found in Suffolk

The large alder sawfly is over 2cm long with a wingspan of 5cm

A rare insect has been recorded in Suffolk for the first time in more than 100 years.

The large alder sawfly (cimbex connatus) was discovered at Lackford Lakes near Bury St Edmunds.

It is the first time the 2cm insect with a wingspan of 5cm has been identified in the county since 1904 when it was seen at Freston Wood.

Suffolk Wildlife Trust said an increase in Italian and grey alders may have attracted the insect.

They resemble hornets but have clubbed antennae and lack the narrow waist and sting.

Castle Museum in Norwich, which along with the Suffolk Biological Records Office helped identify the species, said large alder sawflies had recently been spotted in the Great Yarmouth area.