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Sea urchins or urchins (/ ˈ ɜːr tʃ ɪ n z /) are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres (16,000 ft; 2,700 fathoms). [1]
In Norway, small quantities are fished by hand by freedivers and SCUBA-divers. The fishery is not regulated, and the green sea urchin is considered a pest in the Norwegian waters, eating up the kelp forest. [14] It is not common to find the green sea urchin south of Hitra, and the urchin population is moving northward as water temperatures ...
Tripneustes gratilla, the collector urchin, is a species of sea urchin. Collector urchins are found at depths of 2 to 30 metres (7 to 100 ft) in the waters of the Indo-Pacific, Hawaii, the Red Sea, and The Bahamas. They can reach 10 to 15 centimetres (4 to 6 in) in size.
Centrostephanus coronatus, also known as crowned sea urchin, is a species of sea urchin in the family Diadematidae. It was first described to science by Yale zoology Professor Addison Emery Verrill in 1867.
Astropyga radiata, the red urchin, fire urchin, false fire urchin or blue-spotted urchin, is a species of sea urchin in the family Diadematidae. It is a large species with long spines and is found in the tropical Indo-Pacific region. It was first described in 1778 by the German naturalist Nathaniel Gottfried Leske.
Mespilia globulus, the globular sea urchin, sphere sea urchin, or tuxedo urchin (trade name), is a sea urchin occurring in tropical shallow reef habitats. [1] The specific name refers to a small ball or spherule, describing its overall shape/morphology. [1] It is the only species in the genus Mespilia. [2]
Holopneustes inflatus, the pink sea urchin or sea grass sea urchin is a species of sea urchin of the family Temnopleuridae. Pink Sea Urchins are found in southern Australia, in New South Wales, Victoria, South Australia, Western Australia and Tasmania. The habitat is inter-tidal rocky areas and coastal waters up to a depth of 75 metres.
Psammechinus miliaris is a species of sea urchin in the family Parechinidae. It is sometimes known as the green sea urchin or shore sea urchin . It is found in shallow areas of the eastern Atlantic Ocean and the North Sea .
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