Blue-winged Olives
Baetis
Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
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Definition of 'petiole'
Definition of 'petiole'
Petiole: A petiole is a stalk, like the one attaching a leaf to the plant stem, and organs extended on a stalk are said to be petiolate. This term is also used to describe forks in wing veins that appear at the end of a single vein (like a letter Y) instead of splitting immediately (like a V).
This other word references the same concept: petiolate.
This other word references the same concept: petiolate.