Fatal Metalmark vs Long-Tailed Mayfly
Side-by-side species comparison
| Attribute | Fatal Metalmark | Long-Tailed Mayfly |
|---|---|---|
| Scientific Name | Calephelis nemesis | Palingenia longicauda |
| Order | Lepidoptera | Ephemeroptera |
| Family | Riodinidae | Palingeniidae |
| Size | 18-25 mm wingspan | 30-40 mm body; 60-80 mm cerci |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Nectar Feeders | Omnivores |
| Regions | Southwestern United States, Mexico | Europe |
| Conservation | Least Concern | Vulnerable |
Fatal Metalmark
A tiny dark brown butterfly with fine metallic silver lines across the wings and minute checkered fringes. Despite its ominous name, it is a harmless nectar feeder.
Did You Know?
The name 'nemesis' refers to the Greek goddess of retribution, though the reason for this dramatic name is unclear.
Long-Tailed Mayfly
The largest European mayfly with body and cerci reaching over 120 mm. Its spectacular mass hatches on the Tisza River are a famous natural phenomenon.
Did You Know?
The annual "Tisza bloom" of this mayfly along the Tisza River lasts only a few hours but has been celebrated in Hungarian culture for generations.