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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 ...
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.
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]
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.
Diadema paucispinum is a small sea urchin with very long, moveable spines which are slender and sharply pointed. They can be up to 25 cm (10 in) long and about four times the diameter of the test. The primary spines are bluish-black in colour, often with pale bands in younger individuals.
Coelopleurus exquisitus, the exquisite urchin, is a sea urchin species found off the coast of the island of New Caledonia in the Pacific Ocean. It is an epifaunal deepwater species living at depths between 240 and 520 m (790 and 1,710 ft) and was only identified and named in 2006.
Diadema savignyi is a species of long-spined sea urchin belonging to the family Diadematidae. Common names include long-spined sea urchin , black longspine urchin and the banded diadem . It is native to the east coast of Africa, the Red Sea, the Indian Ocean and western Pacific Ocean.
Z. adamsii lives in symbiosis with a sea urchin, living among its spines. [4] Sea urchins on which it has been found include Asthenosoma ijimai, Diadema setosum, Heliocidaris crassispina, Pseudocentrotus depressus, Salmacis bicolor, Salmacis virgulata, Toxopneustes elegans, Toxopneustes pileolus, Tripneustes gratilla and a species of Acanthocidaris. [3]