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Tripneustes depressus is the largest sea urchin species in the Galápagos Islands with a mean diameter of 11.5 cm (4.5 in). The growth rate averages 0.5 mm (0.02 in) per month. [ 4 ] There is very little difference in morphology between T. depressus , Tripneustes gratilla and Tripneustes ventricosus ; they are suspected of being the same ...
The Antarctic sea urchin ranges in color from bright red to dull purple and can grow to 5 centimetres (2.0 in) in diameter. The test is globular with vertical rows of long, strong, white-tipped spines between which there is a dense covering of smaller spines and vertical rows of tube feet.
It is one of the few sea urchin that can survive many hours out of water. [45] Sea urchins can be found in all climates, from warm seas to polar oceans. [40] The larvae of the polar sea urchin Sterechinus neumayeri have been found to use energy in metabolic processes twenty-five times more efficiently than do most other organisms. [46]
The jewel urchin grows to a diameter of about 3 to 5 centimetres (1.2 to 2.0 in) and has spines up to 3 centimetres (1.2 in) long. Many of them are shorter than this and provide a dense covering. The test is usually a pale brown colour with a red or dark brown stripe along the joints of the main inter ambulacral plates.
Diadema antillarum, also known as the lime urchin, black sea urchin, or the long-spined sea urchin, [2] is a species of sea urchin in the family Diadematidae. This sea urchin is characterized by its exceptionally long black spines. It is the most abundant and important herbivore on the coral reefs of the western Atlantic and Caribbean basin.
Brissus gigas, also known as the giant heart urchin, [1] is a species of sea urchins of the family Brissidae. Their armour is covered with spines. Their armour is covered with spines. Brissus gigas was first scientifically described in 1947 by H.B. Fell. [ 2 ]
Echinoida is an order of sea urchins in the class Echinoidea. They are distinguished from other sea urchins by simultaneously possessing both an un-sculpted test and a feeding lantern with large plates fused across the top of each pyramid.
Pseudocentrotus depressus, commonly known as the pink sea urchin, [2] is a species of sea urchin, one of only two species in the genus Pseudocentrotus.It was first described in 1864 by the American marine zoologist Alexander Agassiz as Toxocidaris depressus, having been collected during the North Pacific Exploring and Surveying Expedition undertaken by Captain Cadwalader Ringgold and later ...