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Mayfly Genus Maccaffertium (March Browns and Cahills)

Taxonomic Navigation -?-
» Genus Maccaffertium (March Browns and Cahills)
Species in MaccaffertiumNumber of SpecimensNumber of Pictures
Maccaffertium ithacaLight Cahill00
Maccaffertium luteum14
Maccaffertium mediopunctatumCream Cahill534
Maccaffertium mexicanumCream Cahill722
Maccaffertium modestumCream Cahill725
Maccaffertium pulchellumLight Cahill00
Maccaffertium terminatum525
Maccaffertium vicariumMarch Brown1156

9 species aren't included.
Common Name
MatchCommon Name
****March Browns and Cahills
Pictures Below ↓

This is page 2 of specimens of Maccaffertium. Visit the main Maccaffertium page for:

  • The behavior and habitat of Maccaffertium.
  • 1 underwater picture of Maccaffertium.
  • 2 streamside pictures of Maccaffertium.

Pictures of 60 Mayfly Specimens in the Genus Maccaffertium:

Specimen Page:1234...7
Female Maccaffertium vicarium (March Brown) Mayfly SpinnerFemale Maccaffertium vicarium (March Brown) Mayfly Spinner View 7 PicturesI collected this mayfly on the same trip as a male of the same species. They are Maccaffertium vicarium mayflies of the type formerly known as Stenonema fuscom, the "Gray Fox."
Collected May 28, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 24, 2006
Male Maccaffertium vicarium (March Brown) Mayfly DunMale Maccaffertium vicarium (March Brown) Mayfly Dun View 10 PicturesI collected this mayfly on the same trip as a female of the same species. After these photos it molted into a spinner. This is the form of Maccaffertium vicarium which anglers call the "Gray Fox."
Collected May 28, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 24, 2006
Female Maccaffertium vicarium (March Brown) Mayfly SpinnerFemale Maccaffertium vicarium (March Brown) Mayfly Spinner View 6 Pictures
Collected June 1, 2005 from the Bois Brule River in Wisconsin
Added to Troutnut.com by Troutnut on May 24, 2006
Female Maccaffertium (March Browns and Cahills) Mayfly AdultFemale Maccaffertium (March Browns and Cahills) Mayfly Adult View 13 Pictures
Collected May 26, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 16, 2006
Female Maccaffertium terminatum Mayfly SpinnerFemale Maccaffertium terminatum Mayfly Spinner View 5 PicturesI was able to identify this female because I captured her while she was mating with an identifiable male.
Collected June 7, 2007 from the West Branch of the Delaware River in New York
Added to Troutnut.com by Troutnut on June 8, 2007
Maccaffertium mediopunctatum (Cream Cahill) Mayfly NymphMaccaffertium mediopunctatum (Cream Cahill) Mayfly Nymph View 4 Pictures
Collected June 8, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 26, 2006
Male Maccaffertium terminatum Mayfly SpinnerMale Maccaffertium terminatum Mayfly Spinner View 11 PicturesI positively identified this specimen under a microscope with a good key. It was one of the more common species in a generally light mixed bag of mayflies over a big Catskill tailwater last night.

I swooped this one out of the air while it was mating with a female, so I can be certain about her ID as well.
Collected June 7, 2007 from the West Branch of the Delaware River in New York
Added to Troutnut.com by Troutnut on June 8, 2007
Male Maccaffertium terminatum Mayfly DunMale Maccaffertium terminatum Mayfly Dun View 6 PicturesBased on the identical size, shape, and relative proportions of different body parts, I'm pretty sure this dun is of the same species as two spinners I collected at about the same time. The color is dramatically different, but that's to be expected with many of these species in the transition from dun to spinner.
Collected June 7, 2007 from the West Branch of the Delaware River in New York
Added to Troutnut.com by Troutnut on June 8, 2007
Maccaffertium luteum Mayfly NymphMaccaffertium luteum Mayfly Nymph View 4 Pictures
Collected January 19, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006
Female Maccaffertium (March Browns and Cahills) Mayfly DunFemale Maccaffertium (March Browns and Cahills) Mayfly Dun View 7 Pictures
Collected June 2, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 24, 2006
Specimen Page:1234...7
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