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29 May 2026 8 views

Gynacantha khasiaca — Long-tailed Duskhawker Dragonfly Rediscovered

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theIAShub
29 May, 2026
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Gynacantha khasiaca — Long-tailed Duskhawker Dragonfly Rediscovered
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Rare dragonfly species rediscovered in Arunachal Pradesh after 112 years — critical for freshwater ecosystem monitoring and biodiversity conservation (Environment & Ecology).

Why in News

A rare dragonfly, Gynacantha khasiaca or the long-tailed duskhawker, was rediscovered in Arunachal Pradesh's Changlang district after being last recorded from the erstwhile Abor Hills in 1914. The new sighting was recorded in Namdapha National Park and Tiger Reserve, about 600 km east of the earlier location.

Key Facts

  • Gynacantha khasiaca belongs to order Odonata — dragonflies and damselflies crucial as both predators and prey in freshwater ecosystems. (UPSC Mains Usage: Indicator species for freshwater ecosystem health — links to GS3 Environment)
  • Species has two compound eyes with thousands of tiny lenses and photoreceptor clusters — providing exceptional visual ability for crepuscular hunting.
  • Genus Gynacantha comprises 92 species globally, around 30 in Southeast Asia, and 10 in India — characterized by pale brown-green colouration.
  • India hosts 504 species and 27 subspecies of Odonata across 152 genera and 18 familiesArunachal Pradesh alone has 110 species.
  • Global Odonata diversity stands at 6,442 species across 693 genera — making it a taxonomically rich order.
  • Distribution: Bangladesh, Myanmar, Nepal and Indian states including Arunachal Pradesh, Assam, Maharashtra, Meghalaya, Uttarakhand, West Bengal.
  • Study recorded 17 Odonata species including Trithemis aurora, Neurothemis fulvia, Orthetrum glaucum.
  • Last recorded 1914 from Abor Hills — 112-year gap highlights biodiversity survey gaps in Northeast India. (UPSC Mains Usage: Northeast biodiversity hotspot — connects to Eastern Himalaya endemic species)

Quick Revision Box

Term

Detail

Order Odonata

Dragonflies + damselflies; 6,442 species globally

Gynacantha genus

92 species worldwide; 10 in India; crepuscular behaviour

India's Odonata

504 species, 27 subspecies across 152 genera

Namdapha National Park

Changlang, Arunachal Pradesh; declared Tiger Reserve 1983

Last recorded

1914 from Abor Hills; rediscovered 2026 after 112 years

Arunachal Pradesh

110 Odonata species; biodiversity hotspot


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