Salmonflies
Pteronarcys californica
The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
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As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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Stonefly Genus Amphinemura (Tiny Winter Blacks)
Genus Range
Specimens of the Stonefly Genus Amphinemura
1 Female Adult
A few of these tiny stoneflies were among the only species of aquatic insect adults in the air on this particular afternoon, with most of the action coming from a species of Epeorus mayfly. I somehow forgot to photograph this one on the usual ruler, but I recall it was very, very small, with an abdomen no more than 1mm in girth and the body, not counting the wings, probably just 5-7mm long.
Start a Discussion of Amphinemura
Stonefly Genus Amphinemura (Tiny Winter Blacks)
Taxonomy
Species in Amphinemura
Amphinemura varshavaWarsaw Forestflies
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Species in Amphinemura: Amphinemura varshava
15 species (Amphinemura alabama, Amphinemura apache, Amphinemura appalachia, Amphinemura banksi, Amphinemura delosa, Amphinemura linda, Amphinemura mexicana, Amphinemura mockfordi, Amphinemura mogollonica, Amphinemura nigritta, Amphinemura puebla, Amphinemura reinerti, Amphinemura texana, Amphinemura venusta, and Amphinemura wui) aren't included.