Blog & Latest Updates
Fly Fishing Articles
Insects by Common Name

Trout Streams & Rivers
Trout Pictures
Underwater Pictures

Desktop Backgrounds
Stream & Bug Videos
Troutnut's Alaska Blog

**Mayfly Genus Maccaffertium (March Browns and Cahills)**

Mayflies

Caddisflies

Stoneflies

Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Heptageniidae (March Browns, Cahills, Quill Gordons)

» Genus Maccaffertium (March Browns and Cahills)

Species in Maccaffertium
Maccaffertium ithacaLight Cahill	0	0
Maccaffertium luteum	1	4
Maccaffertium mediopunctatumCream Cahill	5	34
Maccaffertium mexicanumCream Cahill	7	22
Maccaffertium modestumCream Cahill	7	25
Maccaffertium pulchellumLight Cahill	0	0
Maccaffertium terminatum	5	25
Maccaffertium vicariumMarch Brown	11	56

9 species aren't included.

Common Name

Match	Common Name
	March Browns and Cahills

Pictures Below ↓

This is page 5 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:1...456 7

Maccaffertium modestum (Cream Cahill) Mayfly Nymph

View 3 Pictures

Collected January 13, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Female Maccaffertium (March Browns and Cahills) Mayfly Spinner

View 6 Pictures

Collected July 1, 2005 from the Bois Brule River in Wisconsin
Added to Troutnut.com by Troutnut on April 22, 2006

Male Maccaffertium vicarium (March Brown) Mayfly Spinner

View 3 Pictures

Collected May 28, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Maccaffertium mexicanum (Cream Cahill) Mayfly Nymph

View 3 Pictures

Collected March 1, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Maccaffertium mexicanum (Cream Cahill) Mayfly Nymph

View 3 Pictures

Collected January 13, 2004 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Maccaffertium modestum (Cream Cahill) 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 Dun

View 5 Pictures

Collected June 8, 2005 from the Namekagon River in Wisconsin
Added to Troutnut.com by Troutnut on May 26, 2006

Female Maccaffertium modestum (Cream Cahill) Mayfly Spinner

View 3 PicturesThis one was collected in in association with this male. It looks quite different, but that's often the case between spinner genders.

Collected August 5, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 19, 2006

Maccaffertium (March Browns and Cahills) Mayfly Nymph

View 3 Pictures

Collected March 1, 2004 from unknown in Wisconsin
Added to Troutnut.com by Troutnut on January 25, 2006

Maccaffertium vicarium (March Brown) Mayfly Nymph

View 3 PicturesI keyed this nymph to Stenonema fuscom, which is now synonymized with Maccaffertium vicarium. However, the size, markings, and time of year make me very skeptical of this identification.

Collected June 9, 2005 from the Bois Brule River in Wisconsin
Added to Troutnut.com by Troutnut on May 26, 2006

Specimen Page:1...456 7

Jargon Defined:

Nymph: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).

Spinner: There are two winged stages of adult mayflies. They emerge from the water as duns, molt on land (usually) into their fully mature stage, spinners. As spinners, they mate, lay eggs, and die.

Useful References:

Arbona, Fred Jr. 1989. Mayflies, the Angler, and the Trout. Nick Lyons Books.

Caucci, Al and Nastasi, Bob. 2004. Hatches II. The Lyons Press.

Fauceglia, Ted. 2005. Mayflies . Stackpole Books.

Knopp, Malcolm and Robert Cormier. 1997. Mayflies: An Angler's Study of Trout Water Ephemeroptera . The Lyons Press.