Light Cahill Mayfly vs Flat-headed Mayfly
Side-by-side species comparison
| Attribute | Light Cahill Mayfly | Flat-headed Mayfly |
|---|---|---|
| Scientific Name | Heptagenia solitaria | Epeorus assimilis |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Heptageniidae | Heptageniidae |
| Size | 9-13 mm | 10-14 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Herbivores |
| Regions | North America | Europe |
| Conservation | Least Concern | Least Concern |
Light Cahill Mayfly
A pale-colored mayfly highly prized by fly fishers for imitating hatches. Nymphs prefer moderate current over gravel substrates.
Did You Know?
The Light Cahill dry fly pattern, designed to mimic this species, has been used since the 1880s.
Flat-headed Mayfly
A stream-dwelling mayfly nymph with a flattened body for clinging to rocks in rapids.
Did You Know?
Its flattened nymph shape allows it to live in the boundary layer of fast currents.