Idionyx is a genus of dragonflies in the family Synthemistidae, which is earlier treated as a subfamily of Corduliidae. According to World Odonata List, this genera is best considered incertae sedis. Wikipedia
In the book “Dragonflies of Singapore”, Idionyx Yolanda was mentioned that “It is listed as a critically endangered species in the Singapore Red Data Book (was published in 2008).
As per today ( Jan 2022 ), status is Least Concern, updated by Robin Ngiam Dragonflies of Singapore
Location: Windsor Nature Park – Jan 2022
Thanks, Fiora Li for the ID.