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

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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	6	19
Maccaffertium pulchellumLight Cahill	0	0
Maccaffertium terminatum	3	22
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.

57 Mayfly Specimens in the Genus Maccaffertium:

Specimen Page:1...456 7

Maccaffertium mexicanum (Cream Cahill) Mayfly Nymph

View 3 Pictures

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

Maccaffertium mexicanum (Cream Cahill) Mayfly Nymph

View 3 Pictures

Region: Upper Midwest

Collected Mar 1, 2004

Added Jan 25, 2006

Maccaffertium (March Browns and Cahills) Mayfly Nymph

View 3 PicturesEvery picture of this Maccaffertium nymph was taken with my old C740UZ through a microscope.

Region: Northeast

Collected Nov 15, 2004

Added Apr 12, 2006

Maccaffertium vicarium (March Brown) Mayfly Spinner

View 3 Pictures

Region: Upper Midwest

Collected May 28, 2004

Added Jan 25, 2006

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.

Region: Upper Midwest

Collected Aug 5, 2004

Added Jan 19, 2006

Maccaffertium vicarium (March Brown) Mayfly Spinner

View 3 Pictures

Region: Upper Midwest

Collected May 28, 2004

Added Jan 25, 2006

Maccaffertium (March Browns and Cahills) Mayfly Nymph

View 3 Pictures

Region: Upper Midwest

Collected Mar 1, 2004

Added Jan 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.

Region: Upper Midwest

Collected Jun 9, 2005

Added May 26, 2006

Maccaffertium mexicanum (Cream Cahill) Mayfly Nymph

View 2 Pictures

Region: Upper Midwest

Collected Mar 1, 2004

Added Jan 25, 2006

Maccaffertium (March Browns and Cahills) Mayfly Nymph

View 3 Pictures

Region: Upper Midwest

Collected Jan 13, 2004

Added Jan 25, 2006

Specimen Page:1...456 7

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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.