Sulphur Mayfly vs Cahill Mayfly
Side-by-side species comparison
| Attribute | Sulphur Mayfly | Cahill Mayfly |
|---|---|---|
| Scientific Name | Ephemerella dorothea | Stenacron interpunctatum |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Ephemerellidae | Heptageniidae |
| Size | 6-9 mm | 8-12 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Detritivores |
| Regions | North America | North America |
| Conservation | Least Concern | Least Concern |
Sulphur Mayfly
A small pale yellow mayfly that produces reliable evening hatches on eastern North American streams. One of the most important species for fly anglers.
Did You Know?
Sulphur mayfly hatches are so predictable in timing that experienced anglers can arrive at the stream within minutes of the first emergence.
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.
Did You Know?
The Light Cahill fly pattern, inspired by this mayfly, has been a staple of American fly fishing since the 1880s.