Yellow May Dun vs Giant Silk Moth
Side-by-side species comparison
| Attribute | Yellow May Dun | Giant Silk Moth |
|---|---|---|
| Scientific Name | Heptagenia sulphurea | Hyalophora euryalus |
| Order | Ephemeroptera | Lepidoptera |
| Family | Heptageniidae | Saturniidae |
| Size | 10-15 mm | 90-130 mm |
| Habitat | Rivers & Streams | Farmland |
| Diet | Omnivores | Omnivores |
| Regions | Europe | Western North America, from British Columbia to Baja California |
| 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.
Giant Silk Moth
A large western North American silk moth with reddish-brown wings featuring bold white crescent markings and a red-and-white banded body. It is the Pacific coast counterpart of the cecropia moth.
Did You Know?
Hyalophora euryalus can hybridize with the cecropia moth where their ranges overlap, producing fertile offspring in a zone of intergradation.