Thudaca orthodroma is a moth in the family Depressariidae.

The forewings are golden-ochreous brown with snow-white markings.

There is a streak along the costa from one-fifth to before the middle and a subcostal streak from before the middle to the costa at three-fourths, as well as a median longitudinal streak from the base to three-fourths, the lower edge emarginate in the middle, the apex bent upwards.

There is also a streak along the inner margin from one-fourth to near the anal angle and an elongate blotch along the upper two-thirds of the hindmargin, and a small spot on the anal angle.

[2] This article on a moth of the subfamily Hypertrophinae is a stub.