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For Insects, Spiders & Their Kin
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Photo#210495
Pteronarcyid - Pteronarcys proteus

Pteronarcyid - Pteronarcys proteus
1st? order stream, Mount Wonalancet in the White Mountains,, New Hampshire, USA
August 1, 2008
Size: 1.5 in?
The same fellow. This photo shows the gills on the animal's underside, which are unique to pteronarcyids (if I'm not mistaken).

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Pteronarcyid - Pteronarcys proteus Pteronarcyid - Pteronarcys proteus

Yes, Pteronarcyidae
Jonas-

Your stonefly nymph is most likely Pteronarcys proteus, also referred to as an Appalachian Salmonfly. However, with regard to your belief regarding gills, nymphs of both familiy Pteronarcyidae (Salmonflies) and family Perlidae (Common Stones) have tufts of highly branched gills on their thorax around their leg bases.

 
Close cousens
Well, the two are related...
I guess I forgot perlids have them too.