Diadema palmeri is a sea urchin

Sea urchin

Sea urchins or urchins are small, spiny, globular animals which, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum. They inhabit all oceans. Their shell, or "test", is round and spiny, typically from across. Common colors include black and dull...

 of the family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Diadematidae

Diadematidae

Diadematidae is a family of sea urchins.* Astropyga **Astropyga radiata , extant**Astropyga pulvinata , extant**Astropyga magnifica , extant*Centrostephanus...

. It was first discovered by William (Bill) Palmer, at a depth of about 40 m (130 ft) off the Poor Knights Islands

Poor Knights Islands

The Poor Knights Islands are a group of islands off the east coast of the Northland Region of the North Island of New Zealand. They are located to the northeast of Whangarei, and lie offshore half way between Bream Head and Cape Brett. Uninhabited since the 1820s, they are a nature reserve and...

 (35º28´S 174º44´E), a small group off the temperate north eastern coast of New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

. The species has also been found in other sub-tropical regions around the South Pacific

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

 at greater depths, including New Zealand's Kermadec Islands

Kermadec Islands

The Kermadec Islands are a subtropical island arc in the South Pacific Ocean northeast of New Zealand's North Island, and a similar distance southwest of Tonga...

, and Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

's lower east coast - off Danger Point to Montague Island

Montague Island

Montague Island is 9 kilometres offshore from Narooma on the south coast of New South Wales, Australia.-Lighthouse:On the island is a lighthouse maintained by the Australian Maritime Safety Authority. The lighthouse was designed by James Barnet and built in 1881. It was automated in 1986 and...

, New South Wales

New South Wales

New South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...

 (at about 200 m), Lord Howe Island

Lord Howe Island

Lord Howe Island is an irregularly crescent-shaped volcanic remnant in the Tasman Sea between Australia and New Zealand, directly east of mainland Port Macquarie, and about from Norfolk Island. The island is about 11 km long and between 2.8 km and 0.6 km wide with an area of...

 and the Norfolk Island

Norfolk Island

Norfolk Island is a small island in the Pacific Ocean located between Australia, New Zealand and New Caledonia. The island is part of the Commonwealth of Australia, but it enjoys a large degree of self-governance...

Ridge.