Japanese Dobsonfly vs Cottonwood Stag Beetle
Side-by-side species comparison
| Attribute | Japanese Dobsonfly | Cottonwood Stag Beetle |
|---|---|---|
| Scientific Name | Protohermes grandis | Lucanus mazama |
| Order | Megaloptera | Coleoptera |
| Family | Corydalidae | Lucanidae |
| Size | 40-60 mm body length | 22-35 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Predators | Wood Feeders |
| Regions | East Asia, Japan | Central and Southern United States |
| 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).
Cottonwood Stag Beetle
A medium-sized North American stag beetle found near river bottoms. Males have moderately large mandibles.
Did You Know?
They are most commonly found near cottonwood and willow trees along river corridors.