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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]
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 ...
The average adult size is around 50 mm (2 in), but it has been recorded at a diameter of 87 mm (3.4 in). The green sea urchin prefers to eat seaweeds but will eat other organisms. They are eaten by a variety of predators, including sea stars, crabs, large fish, mammals, birds, and humans.
Thus the sea urchin genome provides a comparison to our own and those of other deuterostomes, the larger group to which both echinoderms and humans belong. [12] Sea urchins are also the closest living relative to chordates. [13] Using the strictest measure, the purple sea urchin and humans share 7,700 genes. [14]
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 ...
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Toxopneustes is a genus of sea urchins from the tropical Indo-Pacific.It contains four species.They are known to possess medically significant venom to humans on their pedicellariae (tiny claw-like structures).
Expert warns urchins vital to coral reef ecosystems now ‘functionally extinct’ in Red Sea Mysterious plague is wiping out sea urchins across the globe, scientists say Skip to main content