Pacificulla thrasydora is a moth in the Lecithoceridae family. It was described by Meyrick in 1910. It is found in New Guinea. The wingspan is about 23 mm. The forewings are purplish-black with a broad orange fascia rising from the dorsum beyond the middle and running towards three-fourths of the costa but not reaching it. The hindwings are purplish-black with a broad orange fascia from the middle of the costa to the outer half of the dorsum, occupying the median third of the wing.