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Alex C.

Need second opinion on nymph

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I captured several of this nymph species on a local river. I am 99% sure it's an Isonychia Bicolor nymph, but was hoping someone could confirm it for meIPB Image

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there is a pale stripe that goes down the center of it's back, from near the head to the tails, it doesn't show up very well in the pic though

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Definitely Isonychia (many fine setae on the fore-femora), and probably bicolor. However, definite species identification of nymphs requires careful examination of gill structure, which necessitates a microscope. However, this isn't a problem where there's no overlap (spatially or chronologically) of other species. I have an on-line key at: http://insects.ummz.lsa.umich.edu/~ethanbr...onychiidae.html

Cheers, Ethan

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