Sulphur Mayfly vs Pale Evening Dun
Side-by-side species comparison
| Attribute | Sulphur Mayfly | Pale Evening Dun |
|---|---|---|
| Scientific Name | Ephemerella dorothea | Heptagenia adaequata |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Ephemerellidae | Heptageniidae |
| Size | 6-9 mm | 8-12 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Omnivores |
| Regions | North America | Europe |
| 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.
Pale Evening Dun
A flat-bodied mayfly whose nymphs press tightly against rocks in swift currents. Adults emerge at dusk during summer months.
Did You Know?
Its extremely flattened body allows it to resist currents that would sweep away most other insects.