📸 PhotoPhoto: Alpsdake · CC BY-SA 3.0 · Wikimedia Commons Source
Japanese demoiselle
Calopteryx japonica (Japanese demoiselle · アオハダトンボ)
💡 Everyday Comparisons for Size, Mass & Speed
- 💡 Walking along a clean brook or valley from May to August, you can see it flying up and perching repeatedly (National List of Species of Korea).
- 💡 Males guarding their territories and watching one another by the water's edge also catch the eye (National List of Species of Korea).
Reference standards: coach bus ~12 m, mid-size car ~4.9 m, compact car ~1 t, basketball hoop 3.05 m, credit card 8.56 cm.
📖 1. Overview
The Japanese demoiselle is a damselfly that flies and perches around clear mountain streams and small brooks, distributed throughout Korea except island regions. It also lives in Japan, northeastern China, and Russia.
🦴 2. Anatomy & Morphology
Body size is not listed in the National List of Species of Korea. Its habit of intermittently spreading and folding its wings while perched is noticeable.
🔍 3. Ecology & Behavior
It appears from May to August and preys on small, moving live insects. Males defend territories against one another, and females lay and attach their eggs on the stems of aquatic plants.
🇰🇷 4. Connection to Korea
It is distributed nationwide except in island regions (National List of Species of Korea). The IUCN assessed it as Least Concern (LC) in 2020.
📚 Sources & References
- • IUCN Red List LC (2020) — https://www.iucnredlist.org/species/138180332/142916905
- • IUCN Red List category LC — latest assessment at iucnredlist.org
- • catalogueoflife.org — Q2LG
- • iucnredlist.org — 142916905
- • 국가생물종목록(국립생물자원관) ktsn 120000037280 — https://species.nibr.go.kr/home/mainHome.do?cont_link=009&subMenu=009002&contCd=009002&ktsn=120000037280
- • wikidata.org — Q1808510
- • commons.wikimedia.org — File:Calopteryx japonica female.JPG
- • species.nibr.go.kr — mainHome.do
- • Silhouette: PhyloPic — Maxime Dahirel · CC BY 3.0 (Congeneric silhouette — Calopteryx splendens)
Recorded dimensions are widely cited representative estimates from public literature and may vary by study or specimen.