Black restless ant Queen with workers

Queen measured around 6mm body length and workers just over 2mm. A previous identical queen has been identified as Plagiolepis fuscula here: http://www.ispotnature.org/node/795344. The workers are almost identical to Lepisiota to my eye with blunt propodeal spines and 2 small spines on petiolar flange however they appear to be smaller than the Lepis at my home. The photos of the workers here are of 3 specimens. Will see what the experts say.

2.5 mm, in a branch about 3 m above ground inside a tropical greenhouse in ZOO Lešná.
The Yucatan greenhouse: https://www.youtube.com/watch?v=tx41VIEzSX0
in some places it is open and connected to the outside