Sabatinca caustica is a species of moth belonging to the family Micropterigidae. It was described by Edward Meyrick in 1912. It is endemic to New Zealand and is found in both Southland and at Stewart Island / Rakiura. The adults of this species are variable in appearance with some specimens being mainly white on their forewings while others have forewings that are a more mottled purple-brown colour. Adults are on the wing from the start of October until the middle of December. Larvae feed on the surface of leafy liverworts.

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