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Sea urchins move by walking, using their many flexible tube feet in a way similar to that of starfish; regular sea urchins do not have any favourite walking direction. [13] The tube feet protrude through pairs of pores in the test, and are operated by a water vascular system ; this works through hydraulic pressure , allowing the sea urchin to ...
Paracentrotus lividus is found throughout the Mediterranean Sea and in the eastern Atlantic Ocean from western Scotland and Ireland to the Azores, Canary Islands and Morocco.It is most common in the western Mediterranean, the coasts of Portugal and the Bay of Biscay, where the water temperature in winter varies between 10 and 15 °C.
Stylocidaris affinis, also known as pencil urchin or red lance urchin, [1] is a species of sea urchin. It can be found in Bermuda, Caribbean Sea, Gulf Of Mexico, and the Mediterranean Sea. [1] It occurs on circalittoral and deep sedimentary bottoms near Malta. [2] [3]
Echinocyamus pusillus, commonly known as the pea urchin or green urchin, is a species of sand dollar, a sea urchin in the family Fibulariidae, native to the northeastern Atlantic Ocean and the Mediterranean Sea. It buries itself in gravel or coarse sand at depths down to about 1,250 m (4,000 ft).
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.
A mysterious sea urchin plague has spread across the world, causing the near extinction of the creature in some areas and threatening delicate coral reef ecosystems, a new study suggests.
At any given moment, the team has 1,000 to 2,000 sea urchins in various stages of development. Hamdoun points to transgenic sea urchins his lab is raising at Scripps. (Sandy Huffaker / For The Times)
Sphaerechinus granularis is a species of sea urchin in the family Toxopneustidae, commonly known as the violet sea urchin, [2] or sometimes the purple sea urchin (though the latter is also a common name for a Pacific sea urchin Strongylocentrotus purpuratus). Its range includes the Mediterranean Sea and eastern Atlantic Ocean. [1]