Yellow May Dun vs Flat-headed Mayfly
Side-by-side species comparison
| Attribute | Yellow May Dun | Flat-headed Mayfly |
|---|---|---|
| Scientific Name | Heptagenia sulphurea | Epeorus assimilis |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Heptageniidae | Heptageniidae |
| Size | 10-15 mm | 10-14 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Herbivores |
| Regions | Europe | Europe |
| Conservation | Least Concern | Least Concern |
Yellow May Dun
A bright sulfur-yellow mayfly common across European rivers during early summer. Its flat nymphs are adapted to fast-flowing water on stony substrates.
Did You Know?
The striking yellow color of this mayfly makes it one of the most easily recognizable species on European rivers.
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.