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Mayfly Species Drunella coloradensis (Small Western Green Drake)

Pictures Below
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.  

Where & When


Region: West

Time Of Year (?): July to early October

Preferred Waters: Small streams

Altitude: High
According to Fred Arbona, this species requires streams which never exceed 60F, and this limits them to small streams at high altitude.

Pictures of 9 Mayfly Specimens in the Species Drunella coloradensis:

Specimen Page:12
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 Mystery Creek #249 in Washington
Added to Troutnut.com by Troutnut 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 Mystery Creek #199 in Washington
Added to Troutnut.com by Troutnut on July 30, 2019
Specimen Page:12

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