Japanese Alderfly vs Hellgrammite
Side-by-side species comparison
| Attribute | Japanese Alderfly | Hellgrammite |
|---|---|---|
| Scientific Name | Sialis japonica | Nigronia serricornis |
| Order | Megaloptera | Megaloptera |
| Family | Sialidae | Corydalidae |
| Size | 15-25 mm wingspan | 40-60 mm wingspan |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Predators | Predators |
| Regions | Japan, East Asia | Eastern North America |
| Conservation | Least Concern | Least Concern |
Japanese Alderfly
A medium-sized alderfly found in ponds and slow streams across Japan. It is one of the most common megalopterans in East Asian lowland waters.
Did You Know?
It is one of the few megalopterans adapted to living in rice paddy fields.
Hellgrammite
A dark-colored dobsonfly whose larvae, known as hellgrammites, are prized as fishing bait. Adults are smaller than Corydalus and have serrated antennae.
Did You Know?
Hellgrammite larvae are so effective as fishing bait that they are commercially collected and sold to anglers.