Japanese Dobsonfly vs Common Alderfly
Side-by-side species comparison
| Attribute | Japanese Dobsonfly | Common Alderfly |
|---|---|---|
| Scientific Name | Protohermes grandis | Sialis lutaria |
| Order | Megaloptera | Megaloptera |
| Family | Corydalidae | Sialidae |
| Size | 40-60 mm body length | 12-16 mm |
| Habitat | Rivers & Streams | Ponds & Lakes |
| Diet | Predators | Predators |
| Regions | East Asia, Japan | Europe, Asia |
| Conservation | Least Concern | Least Concern |
Japanese Dobsonfly
A large aquatic insect known as 'hebi-tonbo' (snake dragonfly) in Japanese. The adult males have elongated, curved mandibles. Larvae called 'magotaro-mushi' are used as fishing bait.
Did You Know?
Dobsonfly larvae are prized as live fishing bait in Japan and are collected from stream rocks by anglers targeting ayu (sweetfish).
Common Alderfly
A dark smoky-winged insect commonly found near still or slow-moving waters across Europe. Its aquatic larvae are predators in lake and pond sediments.
Did You Know?
Alderfly females lay hundreds of eggs in neat rows on vegetation overhanging water, and the larvae drop into the water upon hatching.