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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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Golden Spinners

Like most common names,"Golden Spinner" can refer to more than one taxon. They're previewed below, along with 4 specimens. For more detail click through to the scientific names.

Mayfly Species Anthopotamus distinctus

These are sometimes called Golden Spinners.

Mayfly Species Cinygmula subaequalis

These are very rarely called Golden Spinners.
This is the only Eastern species of Cinygmula. It may produce fishable hatches in places but it is not a generally important mayfly.
Dorsal view of a Cinygmula subaequalis (Heptageniidae) (Small Gordon Quill) Mayfly Nymph from Mongaup Creek in New York
I had heard reports of a bright red heptageniid nymph before but never seen one until I found this early instar specimen in a very high water quality small stream in the Catskills.

Mayfly Species Ephemera varia

These are very rarely called Golden Spinners.
This is an excellent hatch of a different character than its Ephemera brethren. Rather than emerging in a flurry of activity within a week, the Ephemera varia hatch may last for more than a month in a single place.
Artistic view of a Female Ephemera varia (Ephemeridae) (Yellow Drake) Mayfly Dun from Aquarium in New York
This yellow drake dun hatched out of my aquarium over a month before her brethren in the wild are slated to emerge. She seems a bit small, and that might be the reason.
Lateral view of a Female Ephemera varia (Ephemeridae) (Yellow Drake) Mayfly Spinner from Cayuta Creek in New York
I found this female spinner ovipositing in a small stream. She came along while I was playing a trout -- every good bug seemed to do that last night! I didn't have my bug net, so I caught the trout in my landing net, released the trout, and caught the mayfly in my landing net. Her wing got a bit messed up from that.
A burrowing mayfly nymph. The juvenile stage of the brown drake, Ephemera simulans

Dorsal view of a Ephemera varia (Ephemeridae) (Yellow Drake) Mayfly Nymph from Fall Creek in New York

References

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