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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
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.

Dorsal view of a Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Parsond
Parsond's profile picture
Green River Wyoming

Posts: 9
Parsond on Sep 11, 2015September 11th, 2015, 1:30 pm EDT
Just a few highlights from this summers guiding here in SW Wyoming
Wbranch
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Sep 12, 2015September 12th, 2015, 12:53 pm EDT
Beautiful thick bodied hen rainbow. Would you be willing to tell us what river you were fishing?
Catskill fly fisher for fifty-five years.
Partsman
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bancroft michigan

Posts: 321
Partsman on Sep 18, 2015September 18th, 2015, 6:48 pm EDT
Wow,so cool. congrats on a beautiful catch.

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