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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: 1278
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.
Roger Rohrbeck
www.FlyfishingEntomology.com

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