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Tripneustes gratilla, the collector urchin or halloween urchin [1], 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.
Colobocentrotus atratus, commonly named the helmet urchin or shingle urchin, is a species of sea urchin in the family Echinometridae. [1] In Hawaii, it is called hāʻukeʻuke . It is found on wave-swept intertidal shores in the Indo-West Pacific , particularly on the shores of Hawaii .
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.
These sea urchins have been recorded as fossils from Miocene to Recent (from 15.97 to 0.0 Ma). Fossils have been found in the sediments of Southern Europe, Mediterranean and North Africa, Caribbean, Western coast of America and throughout the Indo-Pacific.
Heterocentrotus are brightly colored tropical sea urchins with very thick spines that have given them the nickname "slate pencil urchins", named after slate pencil.. The genus consists of sea urchins with rounded (but slightly elliptical) test , with the peristome (mouth) located in the center of the oral surface (lower) and the periproct at ...
English: This is a cross section of a normal sea urchin. The cross section is not symmetrical to show the five point radial symmetry. 1 - genital plate 2 - gonopore 3 - anus 4 - hard plate with madreporite 5 - axial gland 6 - gonad 7 - intestine 8 - ampullae 9 - test 10 - radial canal 11 - esophagus
Chondrocidaris gigantea, also known as the rough-spined urchin [2] or blade-tipped tiara-urchin, [1] [3] is a species of sea urchin of the family Cidaridae. Chondrocidaris gigantea was first scientifically described in 1863 by Alexander Agassiz .
Heterocentrotus mammillatus shares many of the same predators as the other tropical sea urchins living in its habitat. For example, fish, such as those belonging to the families Balistidae, Labridae, and Lethrinidae, are known to prey on sea urchins. [7] H. mammillatus is also collected and eaten by humans, though not as often as Tripneustes ...