Izatha austera is a species of moth in the family Oecophoridae. It was first described by Edward Meyrick in 1883 and is endemic to New Zealand. This species can be found throughout the North Island and has also been observed in the Nelson region in the South Island. The larvae of I. austera feed on dead wood by tunnelling into branches of its host species. The larvae matures from September and is on the wing in the months of December to January. The adult moth is variable in colouration but is seldom observed.

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