Identify this thin and strangely-shaped dragonfly, and understand why the shape looks so weird
This dragonfly damselfly is from the species Pseudocopera ciliata. Dragon fly anatomy changes between species and there is not definitive answer for why it looks like that, the best guess i can give is that it may assist the female as she tries to find the hookup point for mating.
General Information
More Information(Pay-wall)
This is in Chinese but confirms presence in Taiwan: http://gaga.biodiv.tw/new23/s3-37.htm