I'm def is not very sure of the id of this species as I'm not a specialist of this group of animals but these were come from original China dealer who seems like knew his stuff very well.
The other species someone can mix it to me is Echinotriton asperrinus
or Ech. vietnamense
(if both are not the same).
The last one i was faced personally in the wild and they are not the same i think.
Here's a pictures for comparison (i may post some into separate thread if needed).
Best regards, Mikhail F. Bagaturov The Leningrad Zoo, St.Petersburg, Russia, "Department of Insectarium and Amphibians"
Visit my site at http://tarantulas.tropica.ru