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Western Slate Olive Duns

Like most common names, "Western Slate Olive Dun" can refer to more than one taxon. They're previewed below, along with 4 specimens. For more detail click through to the scientific names.

Mayfly Species Drunella spinifera

These are pretty much always called Western Slate Olive Duns.
This taxon prefers cold water and does not flourish where water temperatures exceed 60 degrees. As with the slightly larger Drunella coloradensis, this species prefers cold tailwaters, high elevation headwaters and spring creeks.
Drunella spinifera (Western Slate Olive Dun) Western Slate Olive Dun NymphDrunella spinifera (Western Slate Olive Dun) Mayfly Nymph View 3 PicturesThis species resembles Drunella grandis but the spines tell the story.
Collected December 19, 2009 from in
Added to Troutnut.com by on June 26, 2011

Mayfly Species Drunella flavilinea

These are very rarely called Western Slate Olive Duns.
The Flavs pick up about a week after the closely related but larger Western Green Drakes (Drunella grandis and Drunella doddsii) finish hatching on most Western waters.

Their hatches may be complemented by simultaneous hatches of two less prolific species, Drunella coloradensis and Drunella spinifera.
Drunella flavilinea (Flav) Mayfly DunDrunella flavilinea (Flav) Mayfly Dun View 1 Pictures
Collected July 31, 2010 from in
Added to Troutnut.com by on June 29, 2011
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