White Miller Mayfly vs Blue-Winged Olive
Side-by-side species comparison
| Attribute | White Miller Mayfly | Blue-Winged Olive |
|---|---|---|
| Scientific Name | Ephoron virgo | Baetis tricaudatus |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Polymitarcyidae | Baetidae |
| Size | 12-18 mm | 5-9 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Omnivores |
| Regions | Europe, Western Asia | North America |
| Conservation | Least Concern | Least Concern |
White Miller Mayfly
A white-bodied European mayfly that emerges in enormous synchronized swarms at dusk. Females are unique among mayflies in that they moult directly into the spinner stage.
Did You Know?
Swarms at bridges and streetlights can be so thick they cause traffic hazards.
Blue-Winged Olive
A small olive-colored mayfly with distinctive bluish-gray wings, abundant in clean streams across North America. It produces multiple generations per year.
Did You Know?
Blue-winged olives are among the few mayflies that hatch in winter, providing vital food for trout during cold months.