Big Spreadwing (Indolestes risi)
The Big Spreadwing was described in 1909, it is known from only one male specimen, which is now lost, as well as from three female specimens; it was found at an unspecified place on new Guinea.
The species reaches a wingspan of about 4,2 cm and is said to be easily recognizable by the shape of the base of the hindwings as well as by the presence of a patch of long black setae in this area in the males. [1]
It is now thought to be possibly extinct.
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References:
[1] Vincent Kalkman; Albert Orr: Field Guide to the damselflies of New Guinea. Brachytron 2013
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edited: 13.11.2021