Western Iron Dun vs Mountain Flathead Mayfly
Side-by-side species comparison
| Attribute | Western Iron Dun | Mountain Flathead Mayfly |
|---|---|---|
| Scientific Name | Epeorus longimanus | Cinygmula ramaleyi |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Heptageniidae | Heptageniidae |
| Size | 10-14 mm | 7-10 mm |
| Habitat | Rivers & Streams | Mountains |
| Diet | Omnivores | Omnivores |
| Regions | North America | North America |
| Conservation | Least Concern | Least Concern |
Western Iron Dun
An iconic eastern mayfly that signals the start of spring fly-fishing season. Nymphs have only two tails and cling to rocks in fast current.
Did You Know?
It was named after Theodore Gordon, considered the father of American dry-fly fishing.
Mountain Flathead Mayfly
An alpine mayfly restricted to high-elevation cold streams in the Rocky Mountains. Nymphs feed on diatom films on boulder surfaces.
Did You Know?
This species cannot survive in water temperatures above 15 degrees Celsius.