Based on Suhling et. al., 2014 which I use for identifying Odonatan larvae, this specimen corresponds with the description of Lestinogomphus (based on the long hind legs which reaches abdominal segment 9, excluding the breathing tube). However, no image of the habitus of Lestinogomphus is attached, nor can be found online, hence my question.
I also have the larvae of Phyllogomphus which is totally different from this, based on general size and other dimensions.