October 2011. Images of a stick insect collected on a forest plant (Castanopsis sp.) in Chi Linh district, Hai Duong Province, Vietnam.

Paul Brock, an associate of PestNet, wrote:

When I first saw these, my response was:
The stick insect is a female belonging to the subfamily Necrosciinae; with its shortened hindwings, perhaps in or near Micadina. See my taxonomic website http://phasmida.speciesfile.org I cannot pinpoint them to species level without specimens, preferably male, female and eggs, but safe enough to provisionally call it Micadina sp. – existing species are known from China, Japan and Taiwan. My current projects mean I have no time to look at other Vietnam taxa i.e. it could have been described in a completely different genus, but my view is something like 33% of the Vietnam phasmids have not been described yet, maybe a much higher percentage.