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DayTripperJune 30th, 2009, 4:58 am
Northern MI

Posts: 70
I was hoping someone could help clear up a few Isonychia questions I have-

Last I checked, Isonychia sadleri was lumped in with Isonychia bicolor, correct?

Not that there were any substantial differences between the two, at least as far as physical appearance from an angler's perspective; but I was under the impression that it was sadleri that emerged in the stream, and bicolor that crawled out and emerged on the river bank. With the two species now being lumped together, is it accurate to say that bicolor emerges both in the stream and on the bank? Thanks!
GONZOJune 30th, 2009, 7:19 am
Site Editor
"Bear Swamp," PA

Posts: 1681
Yes and yes, Alex: In addition to sadleri, several other former species (albomanicata, christina, circe, fattigi, harperi, matilda, and pacoleta) are now considered to be synonymous with bicolor. The character of the stream and prevailing water conditions will probably determine the predominant manner of emergence, but individuals are capable of emerging in either way. (Just in case you are interested, a discussion of multi-brooding/voltinism in Isonychia can be found here: )
DayTripperJune 30th, 2009, 8:05 am
Northern MI

Posts: 70
Thanks, Gonzo!

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