The long-finned sand diver (Limnichthys polyactis) or tommyfish, is a species of sandburrower endemic to the coastal waters around the North Island of New Zealand to depths of about , on sandy or gravelly bottoms. It can reach a length of TL.Tony Ayling & Geoffrey Cox, Collins Guide to the Sea Fishes of New Zealand, (William Collins Publishers Ltd, Auckland, New Zealand 1982)
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