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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.

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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Leeches

This common name refers to only one class. Click its scientific name to learn more.

Animal Class Clitellata-Hirudinae

These are pretty much always called Leeches.
The subclass Hirudinae in the class Clitelatta contains all leeches. Leeches are occasionally found naturally in the drift in trout streams, although I've never heard of them being present in such numbers that they're a major component of the trout's diet.

They make great models for streamer flies because they're so large and ambiguously lifelike, and it's easy to make a little clump of feathers look quite a bit like a leech.
Dorsal view of a Clitellata-Hirudinae (Leech) Animal Adult from unknown in Wisconsin

Leeches

Scientific Name
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