Common Mayfly vs Black Mayfly
Side-by-side species comparison
| Attribute | Common Mayfly | Black Mayfly |
|---|---|---|
| Scientific Name | Ephemera danica | Ephemera danica var. nigra |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Ephemeridae | Ephemeridae |
| Size | 15-25 mm body | 15-25 mm body |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Detritivores | Omnivores |
| Regions | Europe | Europe |
| Conservation | Least Concern | Least Concern |
Common Mayfly
Adults have no functional mouths and live only 1-3 days. Massive synchronized emergences called "hatches" are among natures great spectacles. Excellent water quality indicators.
Did You Know?
Mayflies have the shortest adult lifespan of any insect — some species live just 5 minutes as adults, long enough only to mate. They are the only insects with a winged sub-adult stage.
Black Mayfly
A dark color variant of the common Green Drake mayfly found in some European populations. The dark form is more prevalent in upland, acidic waters. Important for trout feeding.
Did You Know?
The dark form predominates in acidic upland streams while the typical yellow form prefers alkaline lowland rivers.