White Miller Mayfly vs Caenis Mayfly
Side-by-side species comparison
| Attribute | White Miller Mayfly | Caenis Mayfly |
|---|---|---|
| Scientific Name | Ephoron virgo | Caenis horaria |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Polymitarcyidae | Caenidae |
| Size | 12-18 mm | 3-6 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Detritivores |
| Regions | Europe, Western Asia | Europe |
| 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.
Caenis Mayfly
One of the smallest mayflies, often called the 'angler's curse' because trout feed on them selectively. Larvae inhabit slow-flowing rivers and lake margins.
Did You Know?
Caenis mayflies are called the angler's curse because their tiny size makes matching them with artificial flies nearly impossible.