Large Dark Olive Mayfly vs Small Square-Gilled Mayfly
Side-by-side species comparison
| Attribute | Large Dark Olive Mayfly | Small Square-Gilled Mayfly |
|---|---|---|
| Scientific Name | Baetis rhodani | Caenis luctuosa |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Baetidae | Caenidae |
| Size | 6-10 mm | 3-6 mm |
| Habitat | Rivers & Streams | Ponds & Lakes |
| Diet | Omnivores | Omnivores |
| Regions | Europe | Europe |
| Conservation | Least Concern | Least Concern |
Large Dark Olive Mayfly
The most common European mayfly, emerging year-round in many rivers. It is a small olive-brown species that serves as a staple food for stream fish.
Did You Know?
This mayfly can produce up to three generations per year, making it available as fish food in every season.
Small Square-Gilled Mayfly
A minute mayfly with distinctive square-shaped gills on its nymphs. Adults swarm in enormous numbers near water at twilight.
Did You Know?
The enlarged second gill plate acts as a protective cover over the remaining delicate gills.