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Western Slate Olives

Scientific Name
MatchScientific Name
*Drunella flavilinea

This common name refers to only one species.

Mayfly Species Drunella flavilinea

These are very rarely called Western Slate Olives.
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 NymphDrunella flavilinea (Flav) Mayfly Nymph View 6 PicturesAlthough the identification is not certain because the nymph is not yet mature, the configuration of tubercles (
A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled.  They are especially large in this species.
A few (not all) of the abdominal tubercles on this Ephemerella needhami nymph are circled. They are especially large in this species.
Tubercle: Various peculiar little bumps or projections on an insect. Their character is important for the identification of many kinds of insects, such as the nymphs of Ephemerellidae mayflies.
)
on this one--particularly the forefemora--seems to best match Drunella flavilinea.
Collected July 2, 2019 from in
Added to Troutnut.com by on July 18, 2019
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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