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> Bitterroot river April mayfly nymph ?

Leskorcala	April 7th, 2020, 7:41 pm
Posts: 10	Love to pick few brains to ID this black and white mayfly nymph I just collected one on Bitterroot river in Montana April 7th I found it under tree trunk Thanks
Millcreek	April 8th, 2020, 9:28 am
Healdsburg, CA Posts: 342	Definitely a member of Heptageniidae. Might be a Rhithrogena. If you still have the specimen, put it on it's back and see if the gills form a "suction cup", or if they meet in front and back, like in this picture. https://calphotos.berkeley.edu/cgi/img_query?enlarge=0000+0000+0816+0153
	"If we knew what it was we were doing, it would not be called research, would it?" -Albert Einstein
Leskorcala	April 8th, 2020, 9:08 pm
Posts: 10	Thank you for your help fortunately i did not collect the specimen, i will try next time out.Very different in black and white or cream markings which i have not seen often.
Millcreek	April 8th, 2020, 9:25 pm
Healdsburg, CA Posts: 342	I'm guessing at Rhithrogena. Seems likely because of the general aspect of it. The color is unusual for Rhithrogena but there are several undescribed species of western Rhithrogena nymphs.
	"If we knew what it was we were doing, it would not be called research, would it?" -Albert Einstein
Konchu	April 10th, 2020, 10:50 am
Site Editor Indiana Posts: 498	That looks like my search image of a living Rhithrogena. I'm only aware of R. undulata having been found in the Bitterroot R in MT, but like Millcreek said, we don't know as much about the nymphs as we'd like. The record I have was from a June emergence, FWIW.

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