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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.
Sterechinus neumayeri, the Antarctic sea urchin, is a species of sea urchin in the family Echinidae. It is found living on the seabed in the waters around Antarctica. It has been used as a model organism in the fields of reproductive biology, embryology, ecology, physiology and toxicology. [2]
Gracilechinus acutus is a species of sea urchin in the family Echinidae, commonly known as the white sea urchin. It is an omnivore and feeds on algae and small invertebrates . [ 2 ]
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Its range extends from the Mediterranean Sea and North African coast to the Caribbean Sea and the Gulf of Mexico. [1] The depth range is between 40 and 210 metres (130 and 690 ft). Off Florida this urchin is usually found on algae or on broken coral substrates , particularly the rubble remains of dead ivory bush coral ( Oculina varicosa ).
At any given moment, the team has 1,000 to 2,000 sea urchins in various stages of development. Hamdoun points to transgenic sea urchins his lab is raising at Scripps. (Sandy Huffaker / For The Times)
A mysterious sea urchin plague has spread across the world, causing the near extinction of the creature in some areas and threatening delicate coral reef ecosystems, a new study suggests.
These sea urchins have a disc-like body, more or less bulging, structured by a flexible test, which is nearly unique among sea urchins. Most species can grow quite big and live in deep seas, though some genera contain shallow species (especially Asthenosoma). [1] The test is composed of thin and weakly calcified plates, not always continuous.