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Diadema palmeri is a sea urchin of the Diadema family. It was first discovered by William (Bill) Palmer, at a depth of about 40 m (130 ft) off the Poor Knights Islands (35º28´S 174º44´E), a small group off the temperate north eastern coast of New Zealand. The species has also been found in other sub-tropical regions around the South Pacific at greater depths, including New Zealand's Kermadec Islands, and Australia's lower east coast - off Danger Point to Montague Island, New South Wales (at about 200 m), Lord Howe Island and the Norfolk Island Ridge.
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