Metaphatus sinuatus is a moth of the family Palaephatidae. It was described by Donald R. Davis in 1986."A New Family of Monotrysian Moths from Austral South America (Lepidoptera: Palaephatidae), with a Phylogenetic Review of the Monotrysia" by Donald R. Davis. It is known from one location in central Chile.
The length of the forewings is about 7 mm. Adults have light brown forewings. They are on wing in November, probably in one generation per year.
Etymology The specific name is derived from Latin sinuatus (meaning bend or curve) and refers to the sinuate apex of the lateral anellar arms in the male.
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