**Mayfly Species Siphlonurus alternatus (Gray Drake)**

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Taxonomic Navigation -?-

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Siphlonuridae (Gray Drakes)

» Genus Siphlonurus (Gray Drakes)

» Species alternatus (Gray Drake)

Common Names

Match	Common Name
	Gray Drake
	Adams
	Brown Quill Spinner
	Black Drake

Pictures Below ↓

This species occasionally produces important spinner falls. Its spinners may join the swarms of Siphlonurus quebecensis or Siphlonurus rapidus, amplifying the importance of all three species.

Where & When

Regions: East, Midwest
Time Of Year (?): Early May through early September; peaking from late June through July

Spinner Behavior

Time Of Day: Evening
Habitat: Riffles

1 Mayfly Specimen in the Species Siphlonurus alternatus:

Siphlonurus alternatus (Gray Drake) Mayfly Nymph

View 2 Pictures

Region: Upper Midwest

Collected Jun 8, 2005

Added May 26, 2006

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Jargon Defined:

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:

Arbona, Fred Jr. 1989. Mayflies, the Angler, and the Trout. Nick Lyons Books.

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.

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

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