Updates from March 3, 2011
Rhithrogena 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 (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.
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