noun
Calopteryx atrata; black-winged damselfly
A species of damselfly with dark wings, found near streams in Japan. The name is usually written in kana.
ハグロトンボは川の近くでよく見られる。
The black-winged damselfly is often seen near rivers.
ハグロトンボの雄は金属光
The male Calopteryx atrata has a metallic sheen on its body.