▁listed ▁as ▁crit ically ▁end anger ed ▁by ▁the ▁IU CN . ▁It ▁is ▁mainly ▁threatened ▁by ▁habitat ▁loss . ▁ ▁Tax onomy ▁The ▁tax onomy ▁of ▁Pres by tis ▁fem or alis ▁under w ent ▁several ▁changes . ▁Up ▁until ▁ 2 0 1 9 , ▁three ▁sub species ▁of ▁P . ▁fem or alis ▁were ▁recognized : ▁P . ▁f . ▁fem or alis ▁( n omin ate ), ▁P . ▁f . ▁per c ura ▁( the ▁East ▁Sum at ran ▁band ed ▁lang ur ), ▁and ▁P . ▁f . ▁ro bin son i ▁( Rob inson ' s ▁band ed ▁lang ur ). ▁Pres by tis ▁f . ▁fem or alis ▁lives ▁in ▁Singapore , ▁and ▁in ▁the ▁states ▁of ▁Joh or ▁and ▁P ah ang ▁of ▁southern ▁Pen ins ular ▁Malays ia , ▁P . ▁f . ▁ro bin son i ▁lives ▁in ▁the ▁northern ▁Mal ay ▁Pen ins ula , ▁including ▁southern ▁My an mar ▁and ▁Th ailand , ▁and ▁P . ▁f . ▁per c ura ▁lives ▁in ▁east - central ▁Sum atra . ▁ ▁Gen etic ▁data ▁suggested ▁that ▁at ▁least ▁P . ▁f . ▁fem or alis ▁and ▁P . ▁f . ▁ro bin son i ▁were ▁different ▁species ▁which ▁was ▁also ▁in ▁agreement ▁with ▁their ▁morph ological ▁characters . ▁However , ▁resol ving ▁all ▁sub species - level ▁boundaries ▁within ▁band ed ▁lang urs ▁required ▁data ▁for ▁P . ▁f . ▁per c ura , ▁which ▁was ▁the ▁least ▁studied ▁among ▁them