Distribution of the ultramassive dense ETGs from z ~ 1.6 to z ~ 0 in the R_e–M_⋆ plane. Ultramassive dense ETGs at 1.2 <z< 1.6 are represented with magenta filled circles. The ETGs from MUNICS sample with available velocity dispersion (five presented here and one in Longhetti et al. 2014) are indicated with black countours. The ETG of MUNICS sample at redshift 1.91 (hence not included in the analysis of Sect. 3.3) is indicated with a blue point. Ultramassive dense ETGs at 0.3 <z< 0.9 and in the local Universe are indicated with blue open triangles and dark grey points, respectively. Solid black lines define the cuts in M_⋆ and Σ of our samples. The small open circles show local ETGs from Thomas et al. (2010) in the redshift range 0.063 <z< 0.1. The red line indicates a line of constant σ derived as , i.e. assuming zero dark matter. The long-dashed line indicates the lower boundary of the size-mass relation as found by Belli et al. (2014) and van der Wel et al. (2014).