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Mayfly Species Drunella spinifera (Western Slate Olive Dun)

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.  

Where & When

Region: West

Time Of Year (?): August and September

This species is most prevalent near the Pacific Coast, but scattered local populations occur throughout the northern states of the West.

Spinner Behavior

Time Of Day: Dusk

These spinner flights are too sparse to be important.

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