Light Cahill Mayfly vs Swamp Metalmark
Side-by-side species comparison
| Attribute | Light Cahill Mayfly | Swamp Metalmark |
|---|---|---|
| Scientific Name | Heptagenia solitaria | Calephelis mutica |
| Order | Ephemeroptera | Lepidoptera |
| Family | Heptageniidae | Riodinidae |
| Size | 9-13 mm | 22-28 mm wingspan |
| Habitat | Rivers & Streams | Wetlands |
| Diet | Omnivores | Omnivores |
| Regions | North America | Upper Midwest United States, Great Lakes region |
| Conservation | Least Concern | Near Threatened; extremely local |
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.
Swamp Metalmark
A rare and localized metalmark butterfly of midwestern wetlands with warm rusty-brown wings marked with fine metallic lines. It has very specific habitat requirements.
Did You Know?
Some populations consist of fewer than 50 individuals, making it one of North America's most vulnerable butterflies.