**Mayfly Species Callibaetis ferrugineus (Speckled Dun)**

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Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Baetidae (Blue-Winged Olives)

» Genus Callibaetis (Speckled Duns)

» Species ferrugineus (Speckled Dun)

Common Names

Match	Common Name
	Speckled Dun
	Blue-Winged Olive
	Speckle-Wing
	Speckled-Winged Dun
	Gray Quill
	Dark Speckled-Wing Quill
	Speckled-Winged Spinner
	Speckled-Winged Quill

Fly Imitations by Orvis

Stage	Fly Pattern
Dun	Blue Winged Olive

Pictures Below ↓

This is by far the most important Callibaetis species in American trout waters. It is known in angling books by its current species name and many old synonyms (Synonym: A former name of a taxon, usually a species. Entomologists frequently discover that two insects originally described as different species are one in the same, and they drop one of the names. The dropped name is said to be a synonym of the remaining name. These changes take a while to trickle into the common knowledge of anglers; for example, Baetis vagans is now a synonym of Baetis tricaudatus.), such as americanus, nigritus, and coloradensis.

Where & When

Regions: East, Midwest, West
Time Of Year (?): Mid-June through September

Because Callibaetis ferrugineus is the combination of what were once thought to be different species, it now exists across the country and displays a wide variety of behaviors, including hatching dates. Different books dealing with one synonym (Synonym: A former name of a taxon, usually a species. Entomologists frequently discover that two insects originally described as different species are one in the same, and they drop one of the names. The dropped name is said to be a synonym of the remaining name. These changes take a while to trickle into the common knowledge of anglers; for example, Baetis vagans is now a synonym of Baetis tricaudatus.) or another give a variety of different dates, basically showing that this species may be found through most of the season. It usually produces two broods, and the angler should consult local hatch charts for their peak times where they are important.

Spinner Behavior

Time Of Day: Mid-morning or mid-evening

Nymph Biology

Current Speed: Slow
Substrate: Vegetation, silt
Environmental Tolerance: Does well in cold water

Unlike most other species of its genus, Callibaetis ferrugineus is adapted to cold water. Cold lakes and sufficiently slow rivers may hold good populations of this mayfly as well as trout.

1 Mayfly Specimen in the Species Callibaetis ferrugineus:

Callibaetis ferrugineus (Speckled Dun) Mayfly Dun

View 3 Pictures

Region: Upper Midwest

Collected Jul 14, 2004

Added Jan 25, 2006

Recent Discussions of Callibaetis ferrugineus

Callibaetis Spinner Habits 7 Replies »

Posted by WildcatRob on Sep 8, 2007

Last reply on Sep 9, 2007 by Taxon

With almost 40 years lake fishing experience in the Northwest (Washington) our callibaetis always seem to start hatching mid afternoon in the evening, mate overnight then the spinners start in the morning. The spinners draw the most intense "rise." I put rise in quotes because it is so delicate there it leaves almost no disturbance at all not even a sip.

Any comments? Hopefully contradictions?

Rob

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Jargon Defined:

Broods: When a species produces more than one generation per year, each one is called a brood.

Synonyms: A former name of a taxon, usually a species. Entomologists frequently discover that two insects originally described as different species are one in the same, and they drop one of the names. The dropped name is said to be a synonym of the remaining name. These changes take a while to trickle into the common knowledge of anglers; for example, Baetis vagans is now a synonym of Baetis tricaudatus.

Useful References:

Caucci, Al and Nastasi, Bob. 2004. Hatches II. 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.

Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.