gibbosa is from vietnam and thailandica from...well easy to guess!
these separation/clarification between the two species was done in 2009 by Olaf Gruss, a german taxonomist. ( by googling gibbosa you won't find the information easely, this is how internet goes! same with people, gibbosa is clearly, for a lot of people what must be called thailandica now)
so i pick this picture from Olaf for educationnal purpose:
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