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Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Nymph Pictures

 Habitat: Shallow riffle over cobble; approx. 1 ft. deep
Size: 8.5 mm. Mature specimens have been captured as large as 10.5 mm.
Emergence schedule: Variable - starting as early as mid March and lasting as late as early June, depending on the year. Usual duration is at least several weeks or more.
Dun Association: Body is elusive pale creamy yellow w/ orange highlights, cream legs and tails, and dun wings
Specimen status in photo: Preserved
Collection method: Kick net

Comments: Extremely common in samples taken from this location. It's color in life was very close to as depicted in the photo; except for the gradual darkening of the abdominal segments as they progress posteriorly, which has been accentuated somewhat by the effects of preservation. Adult association is based upon capture of this taxon at various stages of emergence including: darkened wingcases, split thoraxic notums, and partially ecloded or ''stillborn (
This stillborn Ephemerella subvaria dun is trapped in its shuck.
This stillborn Ephemerella subvaria dun is trapped in its shuck.
Stillborn: In fly fishing, a stillborn insect is one which got stuck in its nymphal or pupal shuck during emergence and floats helplessly on the surface instead of flying away. It is a specific class of cripple, although it is sometimes used interchangeably with that term.
)
'' specimens.

Entoman


This mayfly was collected from the Lower Yuba River on March 21st, 2011 and added to Troutnut.com on November 1st, 2011.

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Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Nymph from the Lower Yuba River in California
AuthorEntoman
CameraCanon PowerShot A490
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Ephemerella dorothea infrequens (Pale Morning Dun) Mayfly Nymph from the Lower Yuba River in California
AuthorEntoman
CameraCanon PowerShot A490

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