Need help with mayfly nymph ID

RustySpinnr has attached this picture to aid in identification. The message is below.

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RustySpinnr	March 26th, 2012, 2:10 pm
Musconetcong watershed, northwest NJ Posts: 3	I recently took this underwater shot in the Big Flat Brook River in northwest NJ and can't properly ID the mayfly in the picture. Any help would be appreciated. Thanks in advance.

Entoman	March 26th, 2012, 3:13 pm
Northern CA & ID Posts: 2604	Hi Rusty, Welcome to the forum! Looks like Maccaffertium vicarium (March Brown) to me, based on the dark tergal banding and head markings. A much better look at the gills (and a few other features) is necessary to know for sure, though.
	"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

Oldredbarn	March 26th, 2012, 4:35 pm
Novi, MI Posts: 2599	Kurt, You seem to be the man these days...Mr. Bug-ID guy...You are working overtime there fella! Get much sleep? :) How about that big fat, waiting to be popped off the rock there and in to a trout, caddis larva? :) Spence
	"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively "Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood

Entoman	March 26th, 2012, 5:07 pm
Northern CA & ID Posts: 2604	Yes, I quit my day job. Jason's pay is much better...:) The caddis is in the genus Rhyacophila (Green Rockworm, Green Sedge). Based on what can be seen of the the head capsule and notum markings, I suspect the species fuscala.
	"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

RustySpinnr	March 26th, 2012, 5:59 pm
Musconetcong watershed, northwest NJ Posts: 3	Hi Rusty, Welcome to the forum! Looks like Maccaffertium vicarium (March Brown) to me, based on the dark tergal banding and head markings. A much better look at the gills (and a few other features) is necessary to know for sure, though. Thanks, it looks different than most Maccaffertium I come across.

RustySpinnr	March 26th, 2012, 6:02 pm
Musconetcong watershed, northwest NJ Posts: 3	Yes, I quit my day job. Jason's pay is much better...:) The caddis is in the genus Rhyacophila (Green Rockworm, Green Sedge). Based on what can be seen of the the head capsule and notum markings, I suspect the species fuscala. I'm pretty sure that Rhyaccophila is attacking the cased caddis which is why I loved this shot. I had only noticed the mayfly nymph from walking through the stream and stopped to put my camera underwater to get a better idea of what I was looking at. Only after downloading this picture did I see the other action. In fact, I first thought I might be looking at a stonefly and not a mayfly nymph as I didn't have on polarized glasses at the time...

Entoman	March 27th, 2012, 5:19 am
Northern CA & ID Posts: 2604	Yes, very unusual, especially the reddish legs. As for what that rockworm is dining on, not sure what the heck that is.:)
	"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman

Jesse	March 30th, 2012, 11:07 pm
Posts: 378	That is a great picture my man, nice work!
	Most of us fish our whole lives..not knowing its not the fish that we are after. http://www.filingoflyfishing.com

Brookyman	April 27th, 2012, 12:15 am
Banned Posts: 797	Hello entoman..I completely agree..Vicaium under our new classifications. Years ago I might have been inclined to lean to fuscum, but in today's times Vicarium. It written all over the tenth segment. Boy oh boy Patrick Maccafferty and Webb have written allot in the resent years. I spent 4 months reading PDF manuals. Mack
	Banned for threatening another user and then trying to circumvent a kinder "soft" ban with fake accounts

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