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Updates from March 3, 2011

Closeup insects by Entoman from the Lower Yuba River in California

Rhithrogena morrisoni (Western March Brown) Mayfly NymphRhithrogena morrisoni (Western March Brown) Mayfly Nymph View 4 PicturesSize - (excluding tails) - 12 mm
Status at time of photo - preserved, but photographed within days of capture.

W. C. Day, Aquatic Insects of California differentiates morrisoni nymphs by submedian pale dots on tergites (
One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.
One tergite of this Isonychia bicolor mayfly spinner is highlighted in red.
Tergite: The top (dorsal) part of a single segment on an insect's abdomen when it consists of a single chitinous plate (sclerite), or an individual sclerite if the segment has more than one.) 8 & 9, which look to be in evidence. This is one of the "super-hatches" on this river that can be prolific March through April.

Entoman
Collected March 3, 2011 from the Lower Yuba River in California
Added to Troutnut.com by Entoman on November 1, 2011
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