Euploea phaenareta is the largest species of the genus, large wings are dark brown on the upper side with a series of discal, post-discal and submarginal spots which are whitish in color with a purple tinge. The discal and post-diskal spots are larger in size toward the apex. On the apex of the hind wings there are whitish spots. The underside of the wings are the same color and pattern as the upper side. Male individuals have large, prominent patches on the hind wing cells.
Larva: Euploea phaenareta larvae are cylindrical and transparent when they hatch, then white with black bands like stripes. Has horns in the 2nd, 3rd thorax and 8th abdominal segments.
Pupa: The pupa of Euploea phaenareta is silver with a pale brown streak.