Rock Bristletail vs Mahogany Dun
Side-by-side species comparison
| Attribute | Rock Bristletail | Mahogany Dun |
|---|---|---|
| Scientific Name | Petrobius brevistylis | Isonychia harperi |
| Order | Archaeognatha | Ephemeroptera |
| Family | Machilidae | Isonychiidae |
| Size | 9-12 mm | 13-17 mm |
| Habitat | Beaches & Coastal | Rivers & Streams |
| Diet | Omnivores | Omnivores |
| Regions | Europe | North America |
| Conservation | Least Concern | Least Concern |
Rock Bristletail
A coastal bristletail found on rocky shores from Scandinavia to the Mediterranean. It has shorter cerci than the related P. maritimus.
Did You Know?
It can tolerate brief immersion in seawater during high tides.
Mahogany Dun
A large reddish-brown mayfly with impressive filter-feeding forelegs. Nymphs prefer moderate to fast riffles with clean gravel substrates.
Did You Know?
Adults hold their forelegs forward in flight, making them easy to identify on the wing.