Six New Butterflies for India from Arunachal’s Siang Valley

Nestled within the lush, rain-drenched terrain of Siang Valley in Arunachal Pradesh, a team of researchers stumbled upon a discovery that would expand India’s butterfly list. What began as a short field survey turned into a thrilling journey — from watching a butterfly lay its eggs on a host plant to spotting a golden-brown species once known only from Tibet.

In late 2024, researchers from the Ashoka Trust for Research in Ecology & the Environment (ATREE), Bengaluru, in collaboration with the Litin Community Conservation Society, spent a month studying butterflies in the community-conserved forest near Simong in Upper Siang. The team — comprising Monsoon Jyoti Gogoi, Rajkamal Goswami, Seena Narayanan Karimbumkara, and Agur Litin (a conservationist from the Litin clan) — photographed 90 species over seven days.
Among them were six butterflies never before recorded in India.

These are,

1. Horaga takanamii — The Litin Onyx

The Litin Onyx takes its name from the Litin clan of the Adi community — one of Arunachal Pradesh’s major Indigenous tribes, whose name means “people of the hills.”
For generations, the Litin clan has acted as guardians of the forest, guided by traditions that treat trees and wildlife as sacred.

The butterfly itself is a delicate jewel — its upper wings shimmer with a metallic blue sheen edged in dark borders, while the underside shows soft brown and white lines. Its thin tails give it the look of a forest leaf swaying in sunlight.
Before this discovery, it was known only from Laos.

2. Dacalana vui — The Narrow-banded Royal

Known from northern Thailand and northern Vietnam, this butterfly lives up to its regal name. It has blue wings in males, bordered with dark edges, and a fine narrow band across the underside — the “royal insignia” that gives it its name.

3. Euthalia zhaxidunzhui — The Tibetan Duke

With velvety brown wings marked by pale, shimmering bands, the Tibetan Duke looks both elegant and camouflaged. The lighter underside allows it to blend into tree bark and dry leaves. True to its title, the butterfly was originally described from Tibet, and its presence in India hints at deeper ecological connections across the Himalayan landscape.

4. Athyma yui — The Tibetan Sergeant

This high-altitude butterfly, also first recorded from Tibet, bears striking brown-and-white bands. Its dark tones and bold white spots make it stand out among the forest shadows. Often found basking in sunny mountain clearings, the Tibetan Sergeant is rare and has a restricted range, thriving only in pristine montane habitats.

5. Stichophthalma neumogeni renqingduojiei — The Tibetan Junglequeen

The Tibetan Junglequeen reigns over the shaded trails of southeastern Tibet — and now, the forests of Arunachal. A large butterfly with earthy brown wings and eye-like spots, it glides low through the undergrowth. The intricate patterns on its underside serve as camouflage among fallen leaves.
But like its name suggests, this quiet monarch faces threats from deforestation and climate change.

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6. Stiboges elodinia — The Mountain Columbine

A rare beauty from the montane forests of Tibet and western China, the Mountain Columbine has soft brown wings and silvery undersides crossed by fine wavy lines — subtle armor for a butterfly that prefers to remain unseen. Its delicate design allows it to disappear effortlessly into the bark and moss of cool, shaded woods.

Arunachal, the Biodiversity Paradise

The discovery of these six species within a small patch of Arunachal forest underscores the biogeographic bridge that the Siang Valley forms between India and the eastern Himalayas.

As the researchers note, “The Brahmaputra River appears to play a critical biogeographic role, facilitating faunal continuity between southeastern Tibet and eastern Arunachal Pradesh.”

What’s most remarkable is that these discoveries were made within just one week of fieldwork. They hint at a vast, still-unexplored diversity fluttering quietly through India’s northeastern rainforests — waiting for someone to look closely enough to see it.

Read More: Why do Butterfly Wings Shimmer?

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