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Echinidae
Echinidae is a family of sea urchins in the order Echinoida. Members of the family are found in the Atlantic Ocean and the Antarctic.Family Echinidae Gray, 1825. The Echinoid Directory. Retrieved 2011-08-28. Characteristics Members of the family Echinidae are characterized by having trigeminate ambulacra (quadrigeminate in one genus) with pairs of pores arranged either as vertical arcs or as a dense band. The ambulacral plates are compound. The tubercles are imperforate and do not have crenulate edges. There are few tubercles on the interambulacral plates. The buccal notches are reduced in size and, their most significant distingu ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sterechinus Neumayeri
''Sterechinus neumayeri'', the Antarctic sea urchin, is a species of sea urchin in the family Echinidae. It is found living on the seabed in the waters around Antarctica. It has been used as a model organism in the fields of reproductive biology, embryology, ecology, physiology and toxicology. Molecular phylogeny The mitochondrial DNA of the Antarctic sea urchin and several other urchins found in the circumpolar region was examined in order to assess their phylogenetic relationships. It was found that ''Sterechinus neumayeri'' was most closely related to '' Paracentrotus lividus'' and '' Loxechinus albus'', both of which are found in the southernmost part of South America. The divergence of the three species began 35 to 25 million years ago, which coincides with the period at which Antarctica became separated from South America. Description The Antarctic sea urchin ranges in color from bright red to dull purple and can grow to in diameter. The test is globular with vertical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gracilechinus Acutus
''Gracilechinus acutus'' is a species of sea urchin in the family Echinidae, commonly known as the white sea urchin. It is an omnivore and feeds on algae and small invertebrate Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chordate ...s. Description Gracilechinus acutus usually grow up to 150 mm in diameter in their adult stage. They appear commonly in a reddish to brown-red color with occasional urchins having a green color. There are vertical white stripes on the ambulacral plates. The Gracilechinus acutus have two types of spines, primary and secondary. Its primary spines are long and tapered while secondary spines are more short and thin. The spines act as a defense mechanism against predators. The area around the mouth does not contain spines, but instead have pedicellariae. Distribu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sterechinus
''Sterechinus'' is a genus of sea urchins in the family Echinidae. All living members of the genus are found in the waters around Antarctica but the first species described in the genus was a fossil and was found in Europe. Description Members of the genus ''Sterechinus'' have compound ambulacral plates that are trigeminate (composed of three elements). These plates have a primary tubercle articulating with a spine on the middle element, a small secondary tubercle in the interambulacral groove on one side of it and 3 pairs of pores on the other. The tube feet are connected to these pores in the living animal and the pore pairs are arranged in a vertical arc. The sutures between the plates are deeply indented. The area of narrow plates around the mouth is small and the buccal notches are shallowly grooved. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gracilechinus
''Gracilechinus'' is a genus of sea urchins in the family Echinidae. Description and characteristics The species in this genus are regular sea urchins, with a rounded test Test(s), testing, or TEST may refer to: * Test (assessment), an educational assessment intended to measure the respondents' knowledge or other abilities Arts and entertainment * ''Test'' (2013 film), an American film * ''Test'' (2014 film), ..., bearing the anus at the top and the mouth at the bottom. They are extremely similar to species in the genus '' Echinus'', but are differentiated by a primary tubercle on every interambulacral plate. Most species in this genus are abyssal, and live in the North Atlantic or close cold seas. Species Species in this genus include:Andreas Kroh (2015), Gracilechinus' in Kroh, A. & Mooi, R. (2015), ''World Echinoidea Database''. References {{Taxonbar, from=Q16639747 Gracilechinus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dermechinus
''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. Taxonomy The species was first described in 1879 as ''Echinus horridus'' by the American zoologist Alexander Agassiz, after being dredged from the deep seabed during the Challenger expedition of 1872–1876. In 1942, it was allocated to the newly erected genus ''Dermechinus'' by the Danish zoologist Ole Theodor Jensen Mortensen, a specialist in sea urchins. Description An unusual-looking bright-orange sea urchin, ''Dermechinus horridus'' is globular when young but sometimes grows to a height more than twice its width. The fine long spines grow in vertical rows and are interspersed with a dense mat of shorter ones. Pedicellariae and tube feet are also present, and the general appearance of the sea urchin is similar to a cylindrical ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinus Esculentus
''Echinus esculentus'', the European edible sea urchin or common sea urchin, is a species of marine invertebrate in the Echinidae family. It is found in coastal areas of western Europe down to a depth of . It is considered "Near threatened" in the IUCN Red List of Threatened Species. Description ''E. esculentus'' is approximately spherical but slightly flattened at both poles. It is reddish or purplish with white tubercles and grows to about ten centimetres in diameter. The brittle, limy test is rigid and divided into five ambulacral areas separated by five inter-ambulacral areas. There are two rows of plates in each of these areas, making twenty rows of plates in total. The test is covered in spines each articulating with a tubercle. There is a dense covering of secondary spines and a smaller number of longer, primary spines, carried on each second or third ambulacral plate. The spines are blunt ended and usually white with purplish tips. There is a radially symmetrical pattern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dermechinus Horridus
''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. Taxonomy The species was first described in 1879 as ''Echinus horridus'' by the American zoologist Alexander Agassiz, after being dredged from the deep seabed during the Challenger expedition of 1872–1876. In 1942, it was allocated to the newly erected genus ''Dermechinus'' by the Danish zoologist Ole Theodor Jensen Mortensen, a specialist in sea urchins. Description An unusual-looking bright-orange sea urchin, ''Dermechinus horridus'' is globular when young but sometimes grows to a height more than twice its width. The fine long spines grow in vertical rows and are interspersed with a dense mat of shorter ones. Pedicellariae and tube feet are also present, and the general appearance of the sea urchin is similar to a cylindrical cactu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinus Melo
''Echinus melo'', melon sea urchin, is a species of sea urchin in the family Echinidae. Description This species grows up to 17 cm (7 in) in diameter. It is spherical or slightly cone-shaped, and the colour of the test is mainly pinkish, yellowish, or greenish-yellow, and banded with white and pale brown, giving it a segmented appearance. The long primary spines are few in number and olive green with pale tips. They grow in a single row on each ambulacral plate. The much shorter secondary spines are yellowish green and are densely packed in several rows.''Echinus melo'' European Marine Life. Retrieved 2011-09-12. Distribution The melon sea urchin is found in the |
Echinoida
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. Taxonomy Order Echinoida * family Echinidae Gray, 1825 * family Echinometridae Gray, 1825 * family Parasaleniidae * family Strongylocentrotidae Gregory, 1900 Image:Paracentrotus lividus profil.JPG, '' Paracentrotus lividus'' ( Echinidae) Image:Echinometra lucunter.jpg, '' Echinometra lucunter'' ( Echinometridae) Image:Urchinhand 300.jpg, '' Strongylocentrotus franciscanus'' (Strongylocentrotidae) See also *''Colobocentrotus atratus'' - Shingle urchin *'' Echinus acutus'' - White sea urchin *''Echinus esculentus'' - Common sea urchin *'' Echinus tylodes'' *''Evechinus chloroticus Kina (''Evechinus chloroticus'') is a sea urchin endemic to New Zealand. This echinoderm belongs to the family Echinometridae and it can reach a maximum dia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinus (sea Urchin)
''Echinus'' is a genus of sea urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) ...s. Species Species in this genus include: Fossils * '' Echinus coglesi'' * '' Echinus dixoni'' * '' Echinus etheridgei'' * '' Echinus lamarcki'' * '' Echinus multicostatus'' * '' Echinus nodulosus'' * '' Echinus paucimiliaris'' * '' Echinus sphaeroides'' * '' Echinus woodi'' References {{echinoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echinoidea
Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of sea urchins are round and spiny, ranging in diameter from . Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. Although algae are the primary diet, sea urchins also eat slow-moving ( sessile) animals. Predators that eat sea urchins include a wide variety of fish, starfish, crabs, marine mammals. Sea urchins are also used as food especially in Japan. Adult sea urchins have fivefold symmetry, but their pluteus larvae feature bilateral (mirror) symmetry, indicating that the sea urchin belongs to the Bilateria group of animal phyla, which also comprises the chordates and the arthropods, the annelids and the molluscs, and are found in every ocean and in every climate, from the tropics to the po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Urchin
Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of sea urchins are round and spiny, ranging in diameter from . Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. Although algae are the primary diet, sea urchins also eat slow-moving ( sessile) animals. Predators that eat sea urchins include a wide variety of fish, starfish, crabs, marine mammals. Sea urchins are also used as food especially in Japan. Adult sea urchins have fivefold symmetry, but their pluteus larvae feature bilateral (mirror) symmetry, indicating that the sea urchin belongs to the Bilateria group of animal phyla, which also comprises the chordates and the arthropods, the annelids and the molluscs, and are found in every ocean and in every climate, from the tropics to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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