Pergalumna indistincta is a species of mite first found in Cát Tiên National Park, Vietnam, in dark loam in a Lagerstroemia forest. This species is similar in notogastral areae porosae, punctate body surfaces, prodorsal setae morphology, and dorsosejugal suture, to Pergalumna amorpha, differing in body size and the development of its adanal setae.