The viscosities of amorphous and semicrystalline polymeric liquid crystals η have been measured by dynamic mechanical analysis. They have been compared with the rotational correlation times of molecular probes, as drawn by Electron Spin Resonance spectroscopy on two different time scales. In all the cases the correlation times of the spinning motion of a cigar-like probes τ| and η are related by a fractional Debye-Stokes-Einstein law, i.e.η| α ηξ, ξ ≤ 1.