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Giant Stonefly/Salmon fly

Pteronarcys californica


P. californica nymphs, or larvae, can grow to lengths in excess of 5 centimetres (2 in). The nymphs' dorsal side (back) is dark in color, although their ventral side (belly) is lighter. The coloring can vary, and subtle patterns are occasionally found on the abdomen.


P. californica is found across western North America, from British Columbia to California. They live in higher-velocity streams and rivers, on medium to large-sized unconsolidated substrates.

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IsabellaFiers 10 years ago

Maybe this one, Pteronarcyidae, also known as giant stoneflies or salmonflies, is a family of the order Plecoptera, but there is no size mentioned.

IsabellaFiers 10 years ago

It looks like that one, but it was bigger I estimate about 2 inch

CostaBoyJack 10 years ago

how big is it?

bayucca 10 years ago
Spotted by

Yellowstone National Park, Wyoming, USA

Spotted on Jul 21, 2013
Submitted on Aug 28, 2013

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