Cahill Mayfly vs Angler's Curse Mayfly

Side-by-side species comparison

Attribute Cahill Mayfly Angler's Curse Mayfly
Scientific Name Stenacron interpunctatum Caenis rivulorum
Order Ephemeroptera Ephemeroptera
Family Heptageniidae Caenidae
Size 8-12 mm 3-5 mm
Habitat Rivers & Streams Rivers & Streams
Diet Detritivores Detritivores
Regions North America Europe
Conservation Least Concern Least Concern

Cahill Mayfly

A cream-to-tan colored mayfly found throughout eastern North America. It is named after the classic Light Cahill fly fishing pattern it inspired.

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Did You Know?

The Light Cahill fly pattern, inspired by this mayfly, has been a staple of American fly fishing since the 1880s.

Angler's Curse Mayfly

A tiny mayfly nicknamed for frustrating anglers who cannot imitate it on hook. Nymphs burrow in fine sediments of slow rivers and streams.

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Did You Know?

At just a few millimeters long, trout feed on them voraciously but anglers struggle to tie flies small enough to match.