Rock Bristletail vs Burrowing Mayfly
Side-by-side species comparison
| Attribute | Rock Bristletail | Burrowing Mayfly |
|---|---|---|
| Scientific Name | Petrobius brevistylis | Hexagenia limbata |
| Order | Archaeognatha | Ephemeroptera |
| Family | Machilidae | Ephemeridae |
| Size | 9-12 mm | 18-32 mm body |
| Habitat | Beaches & Coastal | Ponds & Lakes |
| 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.
Burrowing Mayfly
Creates massive synchronized emergences so dense they appear on weather radar. Billions emerge simultaneously from lake bottoms where nymphs burrowed for up to two years.
Did You Know?
Mayfly emergences along the Mississippi River are so massive they show up on Doppler weather radar — billions of insects rising simultaneously look like approaching thunderstorms.