The eastern species of sifaka, Propithecus diadema, has four distinctly colored subspecies, each with a distinct range. In addition to the diademed sifaka (Propithecus diadema diadema) the other three subspecies include Milne-Edward's sifaka (Propithecus diadema edwardsi), the Silky sifaka (Propithecus diadema candidus), and Perrier's sifaka (Propithecus diadema perrieri). Together with the Indri (Indri indri), with which it is sympatric, Propithecus diadema diadema is the largest of the living lemurs. With its thick, long and spectacularly colored fur (orange, black and white), this sifaka is thought by many to be the most beautiful of the lemurs.
Like the other two species of sifaka, the golden-crowned sifaka and Verreaux's sifaka, the diademed sifaka is a vertical clinger and leaper, and moves through the forest by jumping from one vertical tree trunk to another, propelling itself with its long powerful legs.