Blue-winged Olives
Baetis
Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
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Millcreek on Oct 3, 2014October 3rd, 2014, 8:39 am EDT
Acentrella insignificans nymphs are abundant in the Russian River from early January through April. Most are found in riffles or at the edge of riffles, also found in lesser numbers in glides. They prefer a substrate of clean gravel and cobble. Large numbers of nymphs are often found on the underside of cobbles.
The nymphs were identified to genus using Merritt, Cummins and Berg (2008). They were identified to species using Morihara and McCafferty's "The Baetis Larvae of North America (Ephemeropttera:Baetidae) (1979). They are listed in this account under the synonym Baetis insignificans. http://www.ephemeroptera-galactica.com/pubs/pub_m/pubmoriharad1979p139.pdf I also used Jacobus and McCafferty's key for North American Acentrella larvae in "A new species of Acentrella Bergsstrom (Ephemeroptera:Baetidae) from Great Smoky Mountains National Park, USA" (2006).http://www.ephemeroptera-galactica.com/pubs/pub_j/pubjacobusl2006p101.pdf
The nymphs were identified to genus using Merritt, Cummins and Berg (2008). They were identified to species using Morihara and McCafferty's "The Baetis Larvae of North America (Ephemeropttera:Baetidae) (1979). They are listed in this account under the synonym Baetis insignificans. http://www.ephemeroptera-galactica.com/pubs/pub_m/pubmoriharad1979p139.pdf I also used Jacobus and McCafferty's key for North American Acentrella larvae in "A new species of Acentrella Bergsstrom (Ephemeroptera:Baetidae) from Great Smoky Mountains National Park, USA" (2006).http://www.ephemeroptera-galactica.com/pubs/pub_j/pubjacobusl2006p101.pdf
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