Quick answer: Dysphaea assamensis is a newly named damselfly from Karbi Anglong district, Assam, belonging to the family Euphaeidae. Its formal description was published in the journal Zootaxa on 14 October 2026 and reported on 31 October 2026, ending decades in which it was mistaken for the Myanmar species Dysphaea walli.
Why Dysphaea assamensis is in the news
Researchers from Dibrugarh University, MIT World Peace University (Pune), the Zoological Survey of India and Debraj Roy College, Golaghat, described it in Zootaxa. They netted five males along a partly shaded lowland forest stream that flows from the Karbi Anglong foothills through the Nambor and Garampani Wildlife Sanctuaries. The female was described from field photographs taken by citizen scientists.
Key facts about Dysphaea assamensis
- Group: Order Odonata, suborder Zygoptera (damselflies), family Euphaeidae.
- Type locality: Karbi Anglong district, Assam; the name “assamensis” refers to the state.
- Long confusion: Populations in Northeast India and Bangladesh were long recorded as Dysphaea walli, a Myanmar species described in 1927.
- How to tell it apart: Males have opaque black wing bases, with the forewing patch shorter than the hindwing patch, and narrow opaque wing tips. D. walli has equal wing-base patches and almost clear tips. The new species also has an extensive blue pattern on the upper abdomen.
- Genus count: The description takes the number of recognised Dysphaea species worldwide to ten.
- Region: Its home is shaded streams running through intact forest, part of the Indo-Burma biodiversity hotspot.
- Threat: Forest loss to farming and urban growth at the type locality.
Dragonfly vs damselfly
| Feature | Dragonfly (Anisoptera) | Damselfly (Zygoptera) |
|---|---|---|
| Wings at rest | Held open and flat, like an aircraft | Usually folded together over the body |
| Eyes | Very large and close together | Smaller, with a clear gap between them |
| Body | Stout and short | Slender and twig-like |
| Wing shape | Hindwings broader at the base than forewings | All four wings similar, narrowing where they join the body |
Why damselflies are freshwater health indicators
Odonates spend their larval stage in water and their adult life on land, so they respond to conditions in both. Species differ in how much pollution they can bear: some disappear with mild pollution, others tolerate moderate levels and a few survive in heavily polluted water. Many species are tied to particular sites, so a shift in the species present can signal changes in dissolved oxygen, pH, temperature or habitat structure.
Exam angle: how NDA, CDS and CAPF can ask this
- New species from the Northeast often appear in statement-type questions; know the state, district and group.
- Questions on the Indo-Burma hotspot and bioindicators link this news to static environment topics.
Practice MCQs
Q1. Dysphaea assamensis was described from which district?
(a) Dibrugarh (b) Karbi Anglong (c) Golaghat (d) Sonitpur
Answer: (b) — specimens came from a stream in Karbi Anglong.
Q2. Damselflies belong to which suborder?
(a) Anisoptera (b) Zygoptera (c) Ensifera (d) Caelifera
Answer: (b) — dragonflies are Anisoptera.
Q3. With which species was D. assamensis long confused?
(a) Dysphaea ethela (b) Dysphaea walli (c) Euphaea fraseri (d) Neurobasis chinensis
Answer: (b) — D. walli was described from Myanmar in 1927.
Q4. Odonates are good indicators of freshwater health mainly because:
(a) they feed only on algae (b) their larvae live in water and species differ in pollution tolerance (c) they migrate across continents (d) they are found only in the sea
Answer: (b).
Frequently asked questions
What is Dysphaea assamensis?
It is a damselfly of the family Euphaeidae, formally described in October 2026 from Karbi Anglong district in Assam.
How many Dysphaea species are known now?
With this description, ten Dysphaea species are recognised worldwide.
How is a damselfly different from a dragonfly?
Damselflies are slimmer, have widely separated eyes and usually fold their wings at rest, while dragonflies are stouter and hold their wings open.
Why does this discovery matter?
It settles a long-running identification problem and highlights how fragile forest streams in the Indo-Burma hotspot are.
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Sources: Zootaxa, Research Matters, Scottish Wildlife Trust, Bulletin of the National Research Centre. Facts as reported up to 2 November 2026.
Featured image background (representative): Sunny Joseph / Wikimedia Commons, CC BY 3.0.
