Ardozyga plinthactis is a species of moth in the family Gelechiidae. It was described by Edward Meyrick in 1904. It is found in Australia, where it has been recorded from New South Wales.[1]
The wingspan is about . The forewings are white, sprinkled with pale ochreous and dark fuscous. The markings are pale ochreous mixed or tinged with ferruginous and irrorated with blackish. There is a small spot at the base of the costa, and another at one-fifth, as well as a larger and more blackish oblique semi-oval spot on the costa before the middle and a mark on the base of the dorsum. A small spot is found on the fold at one-third and there is an irregular patch above the tornus, as well as a row of undefined spots beneath the posterior third of the costa and along the termen. The hindwings are pale grey.[2]