| Strongylocentrotus fragilis | |
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| Strongylocentrotus fragilis | |
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| Species: | A. fragilis |
| Binomial name | |
| Strongylocentrotus fragilis (Jackson, 1912) | |
Strongylocentrotus fragilis is a species of sea urchin of the family Strongylocentrotidae.
This is a regular sea urchin, with a spherical test bearing the anus and 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.
This is an abyssal species, occurring at many hundred meters deep on the western coasts of the North America. [1] They are distributed throughout the continental shelf and slope, being most abundant in the 200-300m depth range. [2] [3]
It was first scientifically described in 1912 by Jackson. [4]
This species is often referred as Allocentrotus fragilis, and its taxonomy is still under debate. [1]
Sea urchins, 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. Their tests are round and spiny, usually from 3 to 10 cm across. Sea urchins move slowly, crawling with their tube feet, and sometimes pushing themselves with their spines. They feed primarily on algae but also eat slow-moving or sessile animals. Their predators include sea otters, starfish, wolf eels, triggerfish, and humans.
Kelp forests are underwater areas with a high density of kelp, which covers a large part of the world's coastlines. They are recognized as one of the most productive and dynamic ecosystems on Earth. Smaller areas of anchored kelp are called kelp beds.
The Aspidodiadematidae are a family of sea urchins.
The purple sea urchin, Strongylocentrotus purpuratus, lives along the eastern edge of the Pacific Ocean extending from Ensenada, Mexico, to British Columbia, Canada. This sea urchin species is deep purple in color, and lives in lower inter-tidal and nearshore sub-tidal communities. Its eggs are orange when secreted in water. January, February, and March function as the typical active reproductive months for the species. Sexual maturity is reached around two years.
Bald sea urchin disease is a bacterial disease known to affect several species of sea urchins in the Mediterranean Sea, North Atlantic and along the California coastline. Research suggests two pathogens are responsible for the disease, Listonella anguillarum and Aeromonas salmonicida.
Strongylocentrotus is a genus of sea urchins in the family Strongylocentrotidae containing several species.
The Strongylocentrotidae are a family of sea urchins in the order Echinoida.
The Echinacea are a superorder of sea urchins. They are distinguished by the presence of a rigid test, with ten buccal plates around the mouth, and solid spines. Unlike some other sea urchins, they also possess gills. The group is a large one, with species found worldwide.
The Camarodonta are an order of globular sea urchins in the class Echinoidea. The fossil record shows that camarodonts have been in existence since the Lower Cretaceous.
Aporocidaris fragilis is a species of sea urchin of the family Ctenocidaridae. It is well-armoured with spines. It is placed in the genus Aporocidaris and lives in the sea. Aporocidaris fragilis was first scientifically described in 1907 by Alexander Emanuel Agassiz & Hubert Lyman Clark.
Aporocidaris incerta is a species of sea urchin of the family Ctenocidaridae. It is placed in the genus Aporocidaris and lives in the deep sea. Aporocidaris incerta was first scientifically described in 1902 by Koehler. This species lives around the Antarctic continent at depths down to about 300 m (1,000 ft).
Aporocidaris milleri is a species of sea urchin of the family Ctenocidaridae. Their armour is covered with spines. It is placed in the genus Aporocidaris and lives in the sea. Aporocidaris milleri was first scientifically described in 1898 by Alexander Emanuel Agassiz.
Phormosoma placenta is a species of sea urchin in the order Echinothurioida. It is a deepwater species, seldom being found at depths less than 500 m (1,600 ft), and occurs on either side of the Atlantic Ocean on the continental slope.
Brisaster antarcticus is a species of sea urchins of the Family Schizasteridae. Their armour is covered with spines. Brisaster antarcticus was first scientifically described in 1906 by Döderlein.
Brisaster capensis is a species of sea urchins of the Family Schizasteridae. Their armour is covered with spines. Brisaster capensis was first scientifically described in 1880 by Studer. It is endemic to South Africa.
Brisaster fragilis is a species of sea urchins of the Family Schizasteridae. Their armour is covered with spines. Brisaster fragilis was first scientifically described in 1844 by Düben & Koren.
Brisaster kerguelenensis is a species of sea urchins of the Family Schizasteridae. Their armour is covered with spines. Brisaster kerguelenensis was first scientifically described in 1917 by Hubert Lyman Clark.
Brisaster moseleyi is a species of sea urchins of the Family Schizasteridae. Their armour is covered with spines. Brisaster moseleyi was first scientifically described in 1881 by Alexander Emanuel Agassiz.
Dermechinus is a genus of sea urchin in the family Echinidae found in deep water in the southern Indian, Pacific and Atlantic Oceans. It is monotypic, with Dermechinus horridus, sometimes called the cactus urchin, being the only species.
The Geikie Slide is a submarine landslide on the seabed of the North Atlantic Ocean to the northwest of Scotland. The slide occurs in a region known as the Hebridean Slope, the continental slope where the seabed drops from the continental shelf surrounding Britain into the deep ocean. Since 2014 an area of 2,215 square kilometres (855 sq mi) has been designated as a Nature Conservation Marine Protected Area under the name Geikie Slide and Hebridean Slope MPA.
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