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> > Isoperla marmorata and Taenionema pacificum



Millcreek has attached these 4 pictures to aid in identification. The message is below.
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Isoperla marmorata
Isoperla marmorata
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Isoperla marmorata
Isoperla marmorata
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Taenionema pacificum
Taenionema pacificum
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Taenionema pacificum
Taenionema pacificum
MillcreekFebruary 21st, 2018, 11:50 am
Healdsburg, CA

Posts: 350
I've had the Isoperla species in here before but it was dead when photographed and these are live. Species were identified to genus using "An Introduction to the Aquatic Insects of North America" by Merritt, Cummins and Berg (2008). They were identified to species using "The Isoperla of California (Plecoptera: Perlodidae) Larval Descriptions and a Key to 17 Western Nearctic Species" by J.B. Sandberg.(2011).
http://www2.pms-lj.si/illiesia/papers/Illiesia07-22.pdf
And "New Descriptions of North American Taenionema Larvae (Plecoptera; Taeniopterygidae)" by K.W. Stewart (2009).http://www.zobodat.at/pdf/Illiesia_05_0128-0145.pdf

The nymphs were collected 2/20/18 in shallow, fast water with small to medium gravel. The Isoperla marmorata was 13-15 mm and the Taenionema pacificum was 9-12 mm.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

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