A new species of small-sized Scorpionfish, Scorpaenopsis insperatus, is described on the basis of two specimens collected from Chowder Bay, Sydney Harbour, New South Wales, Australia. The new species is distinguished from other species of Scorpaenopsis by the following combination of characters: a single upper opercular spine (tip not divided) and 30–34 longitudinal scale rows. Scorpaenopsis insperatus is the only member of the genus found in Australian temperate waters.

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