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Closeup insects from the Touchet River

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Pteronarcys californica (Giant Salmonfly) Stonefly NymphPteronarcys californica (Giant Salmonfly) Stonefly Nymph View 2 PicturesHere are two size classes of Pteronarcys nymphs. These probably represent two different generations. The largest will probably emerge next spring and the other in two years. There is probably another generation, smaller, I did not collect. In a Canadian study they discovered Pteronarcys eggs do not all hatch simultaneously but hatch for a period of nearly two years, making their egg/nymphal life 5 years. The other photo is of a curled nymph, a typical response to disturbance.
Collected August 10, 2011 from the Touchet River in Washington
Added to Troutnut.com by Bnewell on August 10, 2011
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