Stonefly larva - Pteronarcys proteus

Moved

… tom murray, 17 February, 2009 - 1:34pm

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I'm inclined...

to think that this is probably proteus rather than biloba. The main reason is that the anterior corners of the pronotum of biloba have more pronounced projections, giving them a "pinched" look. The other reason is more of a personal observation. In most proteus specimens that I have seen, the abdominal "knobs" seem to diminish around the 7th segment. In biloba, those spines are often distinct all the way to the 8th segment. I'm not sure how reliable that observation is, but it does seem fairly consistent in the specimens that I have seen.

… Lloyd Gonzales, 17 February, 2009 - 11:59am

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Thanks Don

Another nymph identified to species!

… tom murray, 19 December, 2007 - 8:10pm

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Pteronarcys biloba

A straight down view is best so that the outline of the abdominal spines can be seen clearly. It is either P. proteus or biloba, and I will go with biloba since the spines are so prominent.

… Donald S. Chandler, 19 December, 2007 - 6:16pm

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Moved

Thanks Crystal!

… tom murray, 28 September, 2006 - 7:13am

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Pteronarcys spp.

This is a Pteronarcys or giant stonefly nymph. He has abdominal gills, which is distinctive of Pteronarcyidae, and there is only one genus in the East.

… Crystal Maier, 28 September, 2006 - 7:08am

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