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Dark Olive Duns

Like most common names, "Dark Olive Dun" can refer to more than one taxon. They're previewed below, along with 3 specimens. For more detail click through to the scientific names.

Mayfly Species Drunella coloradensis

These are very rarely called Dark Olive Duns.
This species is very similar to Drunella flavilinea. In areas where their ranges overlap, they can sometimes be found in the same streams. Allen and Edmunds (1962) say that Drunella coloradensis tends to favor colder water than Drunella flavilinea and that it may emerge as much as a month later.
Drunella coloradensis (Small Western Green Drake) Mayfly NymphDrunella coloradensis (Small Western Green Drake) Mayfly Nymph View 11 PicturesThis one nicely illustrates the variation in coloration within an single Ephemerellid species in a single stream, when compared to its lighter, banded counterpart.
Collected July 25, 2019 from in
Added to Troutnut.com by on July 26, 2019
Male Drunella coloradensis (Small Western Green Drake) Mayfly DunMale Drunella coloradensis (Small Western Green Drake) Mayfly Dun View 8 PicturesThe positive species ID on this dun comes from both the spinner that it (or possibly one other dun just like it) molted into and the overwhelming abundance of nymphs of this species in my kicknet samples from the same site.
Collected July 28, 2019 from in
Added to Troutnut.com by on July 30, 2019
Male Drunella coloradensis (Small Western Green Drake) Mayfly SpinnerMale Drunella coloradensis (Small Western Green Drake) Mayfly Spinner View 9 PicturesThis spinner molted from this dun, or possibly one other dun I had in the same container that looked just like it.
Collected July 28, 2019 from in
Added to Troutnut.com by on July 30, 2019

Mayfly Species Siphlonurus rapidus

These are very rarely called Dark Olive Duns.
This species may reinforce spinner flights of Siphlonurus quebecensis and Siphlonurus alternatus.
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