Plectophila thiophanes is a moth in the family Xyloryctidae.

The forewings are whitish-ochreous with dark fuscous markings.

There is a large sub-basal spot on the dorsum and a transverse line at one-third slightly curved and outwardly oblique, not extending to the margins.

A very oblique broad line is found from two-thirds of the costa to the termen beneath the apex and there is a spot on the costa beyond this, as well as a broad terminal line.

The hindwings are whitish-ochreous with the central part of the disc and terminal area suffused with fuscous.