Carapace with hepatic area less expanded than P. gracilis and marginal projections narrower. No sharp ridges on merus of cheliped. Ischium and palp of outer maxilliped smooth.
SizeCarapace: male 48.7 x 32.6 mm, female 33 x 26.5 mm.
ColourCarapace purplish red with violet patches and white knobs. Chelipeds purplish red, yellow and white, particularly ventrally; palm with inner face pale brown and white; outer purple-brown and white; fingers pale violet with red streaks; teeth white. Walking legs red-brown, with a dirty white band medially on each segment; ventrally mostly white and violet. Antennules and antennae violet, white and brown. Eyestalk violet and white; cornea black with gold flecks.