Black Mayfly vs Mountain Flathead Mayfly
Side-by-side species comparison
| Attribute | Black Mayfly | Mountain Flathead Mayfly |
|---|---|---|
| Scientific Name | Ephemera danica var. nigra | Cinygmula ramaleyi |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Ephemeridae | Heptageniidae |
| Size | 15-25 mm body | 7-10 mm |
| Habitat | Rivers & Streams | Mountains |
| Diet | Omnivores | Omnivores |
| Regions | Europe | North America |
| Conservation | Least Concern | Least Concern |
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.
Mountain Flathead Mayfly
An alpine mayfly restricted to high-elevation cold streams in the Rocky Mountains. Nymphs feed on diatom films on boulder surfaces.
Did You Know?
This species cannot survive in water temperatures above 15 degrees Celsius.