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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]
Consider the sea urchin. Specifically, the painted urchin: ... can order animals online with the specific genetic properties they are hoping to study — transgenic animals, whose genes have been ...
In Norway, small quantities are fished by hand by freedivers and SCUBA-divers. The fishery is not regulated, and the green sea urchin is considered a pest in the Norwegian waters, eating up the kelp forest. [14] It is not common to find the green sea urchin south of Hitra, and the urchin population is moving northward as water temperatures ...
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.
This is a regular sea urchin, with a spherical test bearing the anus on the top and mouth on the bottom. They are somewhat flattened, and of pale pinkish color with white spines. It is a deep-sea species, and they can occur in great number where food is abundant. Strongylocentrotus fragilis (pink) with some Strongylocentrotus pallidus (white).
Paracentrotus lividus is a species of sea urchin in the family Parechinidae commonly known as the purple sea urchin. It is the type species of the genus and occurs in the Mediterranean Sea and eastern Atlantic Ocean.