Mayfly Species Cinygmula mimus

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 Cinygmula (Dark Red Quills)

» Species mimus

Pictures Below ↓

Where & When

Region: West

In Mayflies: An Angler's Study of Trout Water Ephemeroptera , Knopp and Cormier report "occasional" fishable hatches of this species from southern Alberta, and its known range extends down the east slope of the Rockies into the United States.

Hatching Behavior

Time Of Day (?): Late July through early September

Nymph Biology

Environmental Tolerance: Prefers cool water

Pictures of 3 Mayfly Specimens in the Species Cinygmula mimus:

Male Cinygmula mimus Mayfly Spinner

View 2 PicturesMale Cinygmula mimus spinner trapped in its subimago (Subimago: Mayfly nymphs emerge from the water into subimagoes, better known to anglers as "duns." They are a sexually immature, winged, recognizably adult stage and they must molt one more time into imagoes or "spinners" before they can mate.) skin, a cripple (Cripple: In fly fishing, a cripple is any insect which has been injured or deformed so that it cannot escape the water. This may include stillborn emergers or fully emerged adults which have been damaged, often by wind or waves, so that they can no longer fly. Trout often favor eating crippled insects.)??

Collected June 3, 2012 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on June 5, 2012

Male Cinygmula mimus Mayfly Adult

View 1 Pictures

Collected May 20, 2012 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on May 25, 2012

Female Cinygmula mimus Mayfly Spinner

View 1 Pictures

Collected May 20, 2012 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on May 25, 2012

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Jargon Defined:

Cripple: In fly fishing, a cripple is any insect which has been injured or deformed so that it cannot escape the water. This may include stillborn emergers or fully emerged adults which have been damaged, often by wind or waves, so that they can no longer fly. Trout often favor eating crippled insects.

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.

Subimago: Mayfly nymphs emerge from the water into subimagoes, better known to anglers as "duns." They are a sexually immature, winged, recognizably adult stage and they must molt one more time into imagoes or "spinners" before they can mate.

Useful References:

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