Hi Simone, yes, it's not easy to get photos of these tiny ants in the field. As they are so small I can't really see the features I need to ID to even genus level. There are a few genera with very small ants like this in the region, including Tapinoma, as you have suggested, as well as Doleromyrma and Arnoldius, and I can't be sure from the photos. Cheers, Jon