Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

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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Amphizoa Beetle Larva Amphizoa Beetle Larva

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington

This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).

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27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.

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Ephemerella maculata

Millcreek has attached these 6 pictures. The message is below.

Showing sternites. Coloration common to all specimens.

Length approximately 6 mm (excluding cerci).

Length approximately 8 mm (excluding cerci).

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Apr 10, 2015April 10th, 2015, 7:22 am EDT

Common in the Russian River. Usually found in small gravel, in shallow water. The nymphs were keyed out to family using Merritt, Cummins and Berg (2008) and to species using Allen and Edmunds "A Revision of the Genus Ephemerella (Ephemeroptera; Ephemerellidae) VII. The Subgenus Ephemerella in North America".
http://www.ephemeroptera-galactica.com/pubs/pub_a/puballenr1965p244.pdf
These nymphs show considerable variation in coloring but maintain the same body shape and typical coloring of the sternites.

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