Common Mayfly vs Riffle Beetle
Side-by-side species comparison
| Attribute | Common Mayfly | Riffle Beetle |
|---|---|---|
| Scientific Name | Ephemera danica | Elmis aenea |
| Order | Ephemeroptera | Coleoptera |
| Family | Ephemeridae | Elmidae |
| Size | 15-25 mm body | 1.5-2.5 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Detritivores | Detritivores |
| 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.
Riffle Beetle
A tiny, dark beetle that spends its entire adult life underwater clinging to rocks in riffles. It breathes using a plastron, a permanent thin film of air.
Did You Know?
Its plastron air film never needs replenishing, allowing it to remain permanently submerged.