**Mayfly Species Maccaffertium ithaca (Light Cahill)**

Mayflies

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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 ithaca (Light Cahill)

Common Names

Match	Common Name
	Light Cahill
	Light Cahill Spinner
	Pale Sulphur Dun
	Ginger Quill Spinner
	Dark Cahill
	Cahill
	Cream Dun

Pictures Below ↓

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

The behavior and habitat of Maccaffertium ithaca.

Pictures of 4 Mayfly Specimens in the Species Maccaffertium ithaca:

Specimen Page:12

Male Maccaffertium ithaca (Light Cahill) 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

Specimen Page:12

Jargon Defined:

Dun: Mayflies have two adult stages. They first emerge from the water as duns (scientifically known as the subimago stage). They then molt into the spinner (imago) stage, in which they mate and die. Sometimes the word "dun" is confusingly used to refer to a brownish gray color in fly tying materials.

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:

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

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.

Schwiebert, Ernest G. 1955. Matching the Hatch. MacMillan Publishing Company.