Troutnut.com Fly Fishing for Trout Home
User Password
or register.
Scientific name search:

> > 2 tails or 3

This topic is about the Mayfly Species Maccaffertium vicarium

In the East and Midwest this is one of the most important hatches of the Spring. They are large flies which emerge sporadically, making for long days of good fishing.

This species contains the two classic Eastern hatches formerly known as Stenonema vicarium and Stenonema fuscum, the "March Brown" and "Gray Fox." Entomologists have discovered that these mayflies belong to the same species, but they still display differences in appearance which the trout notice easily. Anglers should be prepared to imitate both types. Read more...

There are 16 more specimens...

The Discussion

SnagyFebruary 5th, 2010, 8:32 pm
Posts: 1I notice that while the dun, nymph, and spinner photos on the page are all listed as March Brown (maccaffertium vicarium). While the coloration patterns all seem to follow other March Browns I have seen, I notice that the winged flies pictures all have 2 tails, but the nymphs in the photos have 3. I was under the impression this species was a 2 tailed mayfly. Is the nymph mislabelled?
TaxonFebruary 6th, 2010, 9:01 am
Site Editor
Plano, TX

Posts: 1308
Snagy-

Good observation. Maccaffertium vicarium belongs to family Heptageniidae (Flatheaded Mayflies). Heptageniids have three tails as a nymph, and two tails in their winged stages, except for two genera, Epeorus and Ironodes, which have two tails, both as nymphs, and in their winged stages.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Quick Reply

You have to be logged in to post on the forum. It's this easy:
Username:          Email:

Password:    Confirm Password:

I am at least 13 years old and agree to the rules.

Related Discussions

TitleRepliesLast Reply
Re: Insect photos on CatskillFlies website
In the Mayfly Genus Ephemerella by Jpsully
4May 24, 2008
by Softhackle
Re: Not sure what this is...
In the Photography Board by Freepow
3Jun 6, 2008
by Freepow
Re: Mayfly swarm
In General Discussion by Millcreek
8Apr 5, 2016
by Millcreek
Re: Need help with mayfly nymph ID
In the Identify This! Board by RustySpinnr
8Mar 30, 2012
by Brookyman
Re: Maccaffertium spinner, maybe??
In the Identify This! Board by Wiflyfisher
9Jun 13, 2008
by Wiflyfisher
Re: Size Variation in March Browns
In the Identify This! Board by Fishskicano
5May 20, 2009
by GONZO
Re: Mayfly nymph ID help.
In the Identify This! Board by Quagmireage
5Apr 11, 2015
by Quagmireage
Re: Maybe Epeorus
In Male Nixe inconspicua Mayfly Dun by Troutnut
16Sep 22, 2011
by Oldredbarn
Re: What mayfly is this
In the Identify This! Board by CouxJoe
9May 17, 2007
by Quillgordon
Re: central penna mayfly nymphs
In the Identify This! Board by Gutcutter
8Jun 14, 2010
by JOHNW
Most Recent Posts
Re: Optics for fly fisherman
In the Photography Board by Jmd123 (Wbranch replied)
Re: When the hatch don't match
In General Discussion by Red_green_h (Jmd123 replied)
Re: Looking for a leader formula...
In Gear Talk by OldHasBeen (Wbranch replied)
Re: Moving to Utah - general questions
In General Discussion by Bigfootry (Martinlf replied)
Re: The Boys Were Back in Town, Chapter 5: "Town and Country"
In the Photography Board by Jmd123 (Martinlf replied)
Re: Selecting a reel
In Beginner Help by AllanM83 (Red_green_h replied)
Re: Views from the Parks Highway
In Site Updates by Troutnut
Re: The Boys Were Back in Town Chapter 5, part 2 of "Town and Country"
In the Photography Board by Jmd123
Re: Glossosoma intermedium or nigrior
In the Saddle-case Maker Genus Glossosoma by Wiflyfisher
Re: MIDGES: who's got a good pattern that works consistently?
In General Discussion by Jmd123