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Large Dark Hendricksons

Scientific Name
MatchScientific Name
*Timpanoga hecuba

This common name refers to only one species.

Mayfly Species Timpanoga hecuba

These are very rarely called Large Dark Hendricksons.
Timpanoga hecuba is not abundant enough, and its emergence not concentrated enough to provide great hatches, but where it is locally abundant it creates fishable action because of its large size. This species seems subject to substantial fluctuations in population densities, possibly in relation to the amount of silted habitat they prefer. When silt builds up in drought years, their numbers appear to increase. It is the largest species in the Ephemerellidae family, often rivaling Drunella grandis (Western Green Drake) in length but appearing even stouter due to its dramatic lateral (Lateral: To the side.) abdominal spines. It contains two subspecies (Subspecies: Entomologists sometimes further divide a species into distinct groups called subspecies, which have two lower-case words on the end of their scientific name instead of one. The latter is the sub-species name. For example, Maccaffertium mexicanum mexicanum and Maccaffertium mexicanum integrum are two different subspecies of Maccaffertium mexicanum.). See the Timpanoga genus hatch page for details.

There seems to be no preferred common name and anglers call them many things. Great Red Quill and Western Red Drake seem to fit best, though many refer to them as Giant Dark Hendricksons. Many fly shop reports have recently started to refer to them by their Latin species name.
Timpanoga hecuba (Great Red Quill) Mayfly NymphTimpanoga hecuba (Great Red Quill) Mayfly Nymph View 2 Pictures
Collected August 26, 2005 from in
Added to Troutnut.com by on June 28, 2011
Female Timpanoga hecuba (Great Red Quill) Mayfly DunFemale Timpanoga hecuba (Great Red Quill) Mayfly Dun View 3 PicturesThis specimen is 14 mm. Technically this is the subspecies (Subspecies: Entomologists sometimes further divide a species into distinct groups called subspecies, which have two lower-case words on the end of their scientific name instead of one. The latter is the sub-species name. For example, Maccaffertium mexicanum mexicanum and Maccaffertium mexicanum integrum are two different subspecies of Maccaffertium mexicanum.) T. h. hecuba. The Cascades, Sierras and further West is where the other subspecies (Subspecies: Entomologists sometimes further divide a species into distinct groups called subspecies, which have two lower-case words on the end of their scientific name instead of one. The latter is the sub-species name. For example, Maccaffertium mexicanum mexicanum and Maccaffertium mexicanum integrum are two different subspecies of Maccaffertium mexicanum.), T. h. pacifica is found. The Great Basin seems to have formed a barrier preventing any overlap in their distribution.
Collected September 15, 2013 from in
Added to Troutnut.com by on September 23, 2013
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