Phallaria ophiusaria is a moth of the family Geometridae. It is known from Australia, including New South Wales, Queensland and Victoria. The wingspan is about 70 mm. Adult have brown wings with a comma-shaped spot and a diagonal stripe on each wing. The larvae feed on Acacia pycnantha, Dodonaea species and Hakea rostrata. They are brown with a hairy pointed knob on the tail. It has the habit of standing straight at an angle on a branch, thus resembling a twig.