''Bassarona durga'', the blue duke,
["''Bassarona'' Moore, [1897]"](_blank)
at Markku Savela's ''Lepidoptera and Some Other Life Forms'' is a species of Nymphalidae">nymphalid
The Nymphalidae are the largest family of butterflies, with more than 6,000 species distributed throughout most of the world. Belonging to the superfamily Papilionoidea, they are usually medium-sized to large butterflies. Most species have a red ...
It is found in Sikkim, Abor Hills and Nagaland.
in 2022 an indian state sikkim has declared it as a state butterfly on the occasion of world environment day.