**Mayfly Species Maccaffertium mexicanum (Cream Cahill)**

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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 mexicanum (Cream Cahill)

Common Name

Match	Common Name
	Cream Cahill

Pictures Below ↓

This species is usually mentioned under its former name, Stenonema integrum. Now integrum is a subspecies (Subspecies: Entomologists sometimes further divide a species into distinct groups called subspecies, which have two lower-case words on the end of their scientific name instead of one. The latter is the sub-species name. For example, Maccaffertium mexicanum mexicanum and Maccaffertium mexicanum integrum are two different subspecies of Maccaffertium mexicanum.) of Maccaffertium mexicanum. It is not said to produce fishable hatches.

I've tentatively identified several specimens I collected as members of this species based on their color patterns. It may be more likely that they belong to a Midwestern color variety of Maccaffertium vicarium which produces good hatches on the river where they were collected.

Where & When

Regions: East, Midwest
Time Of Year (?): Early July through early September

This species is very widespread in scientific records throughout the East and the Midwest, and south to the Gulf of Mexico. It is apparently not abundant on trout streams within this range.

7 Mayfly Specimens in the Species Maccaffertium mexicanum:

Specimen Page:12

Maccaffertium mexicanum (Cream Cahill) Mayfly Nymph

View 5 Pictures

Region: Upper Midwest

Collected Jan 12, 2004

Added Jan 25, 2006

Maccaffertium mexicanum (Cream Cahill) Mayfly Nymph

View 3 Pictures

Region: Upper Midwest

Collected Feb 7, 2004

Added Jan 25, 2006

Maccaffertium mexicanum (Cream Cahill) Mayfly Nymph

View 3 Pictures

Region: Upper Midwest

Collected Jan 14, 2004

Added Jan 25, 2006

Specimen Page:12

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Jargon Defined:

Subspecies: Entomologists sometimes further divide a species into distinct groups called subspecies, which have two lower-case words on the end of their scientific name instead of one. The latter is the sub-species name. For example, Maccaffertium mexicanum mexicanum and Maccaffertium mexicanum integrum are two different subspecies of Maccaffertium mexicanum.

Useful References:

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

Leonard, Justin W. and Fannie A. Leonard. 1962. Mayflies of Michigan Trout Streams. Cranbrook Institute of Science.

Top 10 Hatches

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Baetidae

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Ephemerellidae

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Hexagenia limbata

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Baetis