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Did this have gills on the underside of the thorax? I can't quite tell. If it did then it would be in the family Perlidae. The wide pronotum would then suggest that it could be Dinocras cephalotes.
I was trying to decide from a refernce book if this belonged to the Perlidae or Perodidae family- it says the thorax of the latter lacks bunches of gills. I couldnt say for definite from this image. I do have the specimen in alcohol and I will check it out, the underside.
Let me know when you have had a look. Either way it is an impressive stonefly.
had a look, I can just about make out some white fluffy stuff on its underside, I wonder does this then mean it is Perlidae? Its seems to suggest this, my book says the presence of white filamentous gills on the sides of each thoracic segment means Perlidae and not Perlodidae. It could be Dinocras cephalotes as you suggested?
They look like gills to me. In Dicronas the pronotum (first thoracic segment). Is more than twice as wide as long. It looks like that to me.
This is definitely Dinocras cephalotes. The gills are visible between the legs, giving it the appearance of having hairy armpits - characteristic of the Perlidae. The two Perlid species can be distinguished by the colour of the upperside of the rear section of the abdomen. Here it is dark, in line with other body segments. In Perla bipunctata this last body section would be pale. If somebody wishes to put a positive ID up I'll agree with it.
Lat/Lng: 55.0033, -6.0306
OS grid ref: NW423750