Maccaffertium vicarium

Photo Credit: Jerry Schoen
Maccaffertium vicarium
Common Name: March brown
Other Common Names: grey fox
Other Scientific Names: Stenonema fuscum, Stenonema vicarium
Animal Guild: Insect
Class > Order > Family: Insecta > Ephemeroptera > Heptageniidae
Where is the species found?
States & Provinces
CT, IA, IL, IN, KS, KY, MA, MB, MD, ME, MI, NB, NC, NE, NH, NL, NS, NY, OH, OK, ON, PA, QC, SC, SK, TN, VA, WI, WV
Which phenophases should I observe?
Do you see/hear...?
Activity Adults
One or more adults are seen or heard moving about or at rest. Mayfly adults (imagos or "spinners") are brighter in color than subadults, and have clear, glassy wings.
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Reproduction Mating
A male and female are seen coupled in a mating position, usually one on top of the other.

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Egg laying
A female is seen laying eggs directly onto the water surface, or attached to aquatic plants.

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Development Subadults
One or more subadults are seen moving about or at rest. Mayfly subadults (subimagos or "duns") are duller in color than adults, and have cloudy wings with a fringe of small hairs.

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Dead adults
One or more dead adults are seen.

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Method Individuals at a light
One or more individuals are seen at a light, whether flying or at rest.

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Individuals in a net
One or more individuals are seen caught in a net.

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Individuals in a trap
One or more individuals are seen caught in a trap.

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What do these phenophases look like?

There is currently no photoguide available for this species. If you'd like help us create one, use the guidance document and species template provided here. Then send it via email to education@usanpn.org when it is complete.