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Quill Gordons

Mayflies

Caddisflies

Stoneflies

Scientific Names

Match	Scientific Name
	Epeorus pleuralis
	Rhithrogena futilis
	Epeorus longimanus
	Cinygmula subaequalis
	Rhithrogena undulata

This name primarily describes the important Eastern hatch Epeorus pleuralis. It was the first American trout stream hatch described by anglers, and it is named for the fly pattern created by 19th century fly fishing legend Theodore Gordon to imitate it.

Like most common names, "Quill Gordon" can refer to more than one taxon. They're previewed below, along with 7 specimens. For more detail click through to the scientific names.

Mayfly Species Epeorus pleuralis

These are pretty much always called Quill Gordons.

This is the first really good dry-fly opportunity of the season for most Eastern anglers. They are large mayflies and they have good points of vulnerability both underwater and on the surface.

Epeorus pleuralis (Quill Gordon) Mayfly Nymph

View 4 PicturesThis Epeorus pluralis dun is recently deceased in these photos. I decided not to photograph several lively, less mature nymphs. This one was ready to hatch, as indicated by the black wing pads (

The wing pads on this final instar Baetidae mayfly nymph are extremely dark.

Wing pad: A protrusion from the thorax of an insect nymph which holds the developing wings. Black wing pads usually indicate that the nymph is nearly ready to emerge into an adult.). I believe it had not been dead long enough to lose its natural coloration.

Collected April 19, 2006 from in
Added to Troutnut.com by on April 21, 2006

Male Epeorus pleuralis (Quill Gordon) Mayfly Dun

View 9 PicturesI kept this specimen after photographing it and it molted into a spinner in perfect condition, which I photographed here.

Collected April 30, 2007 from in
Added to Troutnut.com by on May 3, 2007

Male Epeorus pleuralis (Quill Gordon) Mayfly Spinner

View 10 PicturesA few days earlier I photographed this same specimen as a dun. The changes between dun and spinner seem particularly dramatic in this species.

Collected April 30, 2007 from in
Added to Troutnut.com by on May 3, 2007

See 2 more specimens...

Mayfly Species Rhithrogena futilis

These are very rarely called Quill Gordons.

This uncommon and slightly larger species hatches earlier than Rhithrogena hageni, but otherwise is virtually indistinguishable.

Mayfly Species Epeorus longimanus

These are very rarely called Quill Gordons.

Epeorus longimanus and Epeorus albertae are the two most common Epeorus species in the West.

Epeorus longimanus (Slate Brown Dun) Mayfly Nymph

View 2 Pictures

Collected June 24, 2005 from in
Added to Troutnut.com by on June 27, 2011

Female Epeorus longimanus (Slate Brown Dun) Mayfly Spinner

View 1 PicturesI associated this female with a male I collected one night later. For a great and informative discussion of all Epeorus species and other mayflies be sure and read, WESTERN MAYFLY HATCHES by R. Hafele and D. Hughes. They rate all of the western mayflies and they rate the hatch of this genus a 25 out of a possible 45 points based on several rating criterion. They provide insect photos, possible fly patterns and fly presentations. This is a great book.

Collected July 24, 2011 from in
Added to Troutnut.com by on July 25, 2011

See 3 more specimens...

Mayfly Species Cinygmula subaequalis

These are very rarely called Quill Gordons.

This is the only Eastern species of Cinygmula. It may produce fishable hatches in places but it is not a generally important mayfly.

Cinygmula subaequalis (Small Gordon Quill) Mayfly Nymph

View 10 PicturesThis nymph is missing a few gills, but is otherwise in good shape. It was the only one of its species which turned up in my sample.

Collected May 29, 2007 from in
Added to Troutnut.com by on June 4, 2007

See 1 more specimens...

Mayfly Species Rhithrogena undulata

These are very rarely called Quill Gordons.

This is one of the two most common species of Rhithrogena.

Male Rhithrogena undulata (Small Western Red Quill) Mayfly Spinner

View 13 PicturesThis male was collected at the same time as this female and is likely the same species.

It keys pretty clearly to Rhithrogena undulata using the key in Traver 1935, although the size is larger than expected for that species in that source.

Collected July 1, 2019 from in
Added to Troutnut.com by on July 18, 2019

See 1 more specimens...

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.

Natural: A natural is a real insect (or similar creature) a trout might eat. The term is used to specify the real thing as opposed to its artificial imitation.

Nymphs: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).

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.

The wing pads on this final instar Baetidae mayfly nymph are extremely dark.

Wing pads: A protrusion from the thorax of an insect nymph which holds the developing wings. Black wing pads usually indicate that the nymph is nearly ready to emerge into an adult.