March Brown Mayfly vs Yellow May Dun
Side-by-side species comparison
| Attribute | March Brown Mayfly | Yellow May Dun |
|---|---|---|
| Scientific Name | Rhithrogena germanica | Heptagenia sulphurea |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Heptageniidae | Heptageniidae |
| Size | 10-14 mm | 10-15 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Omnivores |
| Regions | Europe | Europe |
| Conservation | Near Threatened | Least Concern |
March Brown Mayfly
A spring-emerging mayfly with a brownish body and two tails, historically important to European fly fishing. Its flat nymphs cling to rocks in fast water.
Did You Know?
This species has declined significantly in many European rivers due to pollution and is now considered an indicator of water quality.
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.