**Mayfly Species Stenonema femoratum (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 Stenonema

» Species femoratum (Cream Cahill)

Common Name

Match	Common Name
	Cream Cahill

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This is the only species remaining in the Stenonema genus after the classic superhatches were reclassified into Maccaffertium. Its habitat and behavior is not different from the Maccaffertium species, except as noted below, and you should consult the page for that genus if you need angling information for this hatch.

Where & When

Regions: East, Midwest
Time Of Year (?): Early May to early September, peaking in early June
Preferred Waters: Lakes, warmwater streams, and warm trout streams

Nymph Biology

Current Speed: Slow to medium
Substrate: Stones, sunken logs, and leaf drift (Leaf drift: The mass of dead leaves gathered on the bottom of the stream, sometimes stacked thick in still places like back eddies. Many aquatic invertebrates use the leaf drift for shelter and food. Most insects shred the leaves to digest the bacteria and plankton living on them, rather than digesting the leaves themselves.)
Environmental Tolerance: Quite tolerant of pollution; thrives in warm water

1 Mayfly Specimen in the Species Stenonema femoratum:

Stenonema femoratum (Cream Cahill) Mayfly Nymph

View 6 Pictures

Region: Catskills

Collected May 6, 2007

Added May 18, 2007

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Jargon Defined:

Leaf drift: The mass of dead leaves gathered on the bottom of the stream, sometimes stacked thick in still places like back eddies. Many aquatic invertebrates use the leaf drift for shelter and food. Most insects shred the leaves to digest the bacteria and plankton living on them, rather than digesting the leaves themselves.

Useful References:

Fauceglia, Ted. 2005. Mayflies . Stackpole Books.

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.

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