The species is only known from females.The female of Diphya vanderwaltae is small and predominantly dark: a dark-brown carapace with an indistinct medianband, a uniformly black sternum, dark-grey femora with fine yellowishlongitudinal lines, and a largely patternless dark-grey abdomen with a few guanine spots; the epigynebears a triangular septum with closely spaced copulatory openings.