I really don't have any clue even about the genus. Maybe someone here can help me? They are from Malaysia.
It's a really small species, size is about 1 mm. They are completely yellow, only the top of the antenna is black. They also have propodeal spines (so it's not a Monomorium species). The colony has many queens, one of them could be also seen here. Because these ants are so small, I wasn't able to take picture of them, only a video.
These ants live arboreal, and build a really nice nest entrance, as could be seen too in the video. It reminds me of the nest entrance of Myrmica schencki...