Syntherata janetta is a moth of the Saturniidae family. In the east it is found in New Guinea and in the northern half of Australia, as far south as Newcastle The wingspan is about 120-140 mm. The larvae feed on various plants, including Euodia elleryana, Geijera salicifolia, Glochidion ferdinandi, Petalostigma quadriloculare, Aegiceras, Ceriops, Timonius rumphii and Podocarpus spinulosus.