Parasa pygmy is a moth of the Limacodidae family. It is found in Taiwan, inhabiting mountains, at altitudes ranging from 2,000 to 3,000 meters. The wingspan is 24–25 mm. The forewing ground colour is chestnut with a large median green patch delimited externally by a thin white line, which in turn is lined by a brown border. The hindwings are chestnut. Adults have been recorded on wing from mid-August to early October, probably in one generation per year.