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Asterina Phylactica
''Asterina phylactica'' is a species of sea star. It can be found in geographically widespread sites around the British Isles and in the Mediterranean Sea. It has five arms, is about 1.5 cm across and is of a green colour with central brown markings. The species was formally described in 1979 and is very similar to '' Asterina gibbosa''. Description ''Asterina phylactica'' is a pentagonal starfish with short blunt arms and a flattened shape. It grows to a diameter of about and is olive-green with a central brown star-shaped marking, a pale underside, and a clear cut edge between the upper and lower surfaces. It can be distinguished from the closely related ''Asterina gibbosa'' by the fact that it has fewer plates surrounding its mouth, its smaller size and its characteristic colouring. At one time the two were believed to be the same species but it was realised in 1979 that besides the differences in appearance, the two occupied different ecological niches and had different ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Star
Starfish or sea stars are Star polygon, star-shaped echinoderms belonging to the class (biology), class Asteroidea (). Common usage frequently finds these names being also applied to brittle star, ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish are also known as asteroids due to being in the class Asteroidea. About 1,900 species of starfish live on the seabed in all the world's oceans, from warm, tropics, tropical zones to frigid, polar regions of Earth, polar regions. They are found from the intertidal zone down to abyssal zone, abyssal depths, at below the surface. Starfish are marine invertebrates. They typically have a central disc and usually five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates. Many species are brightly coloured in various shades of red or orange, while others are blue, grey or brown. Starfish have tube fee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asterina Gibbosa
''Asterina gibbosa'', commonly known as the starlet cushion star, is a species of starfish in the family Asterinidae. It is native to the northeastern Atlantic Ocean and the Mediterranean Sea. Description ''Asterina gibbosa'' is a pentagonal starfish with short blunt arms and an inflated appearance. The aboral (upper) surface is clothed in groups of short, blunt spines. This starfish grows to a diameter of about and may be brown, green or orange. It is sometimes blotched with colour and individuals from deeper sea locations tend to be paler in colour. It can be distinguished from the closely related ''Asterina phylactica'' by the fact that it has two small spines on each of the plates surrounding its mouth, ''A. phylactica'' having no spines on these plates and having a plain olive-green aboral surface with a brown central star. ''A. gibbosa'', at is considerably bigger than ''A. phylactica'' which seldom exceeds . At one time the two were believed to be the same ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine Life Information Network
The Marine Life Information Network (MarLIN) is an information system for marine biodiversity for Great Britain and Ireland Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea .... MarLIN was established in 1998 by the Marine Biological Association together with the environmental protection agencies and academic institutions in Britain and Ireland. The MarLIN data access programme has now become the DASSH Marine Data Archive Cantre. DASSH is built on the existing extensive data and dissemination skills of the Marine Life Information Network (MarLIN), the library and information services of the National Marine Biological Library (NMBL) and the MBA's historical role in marine science. References {{ocean-stub Biology organisations based in the United Kingdom Information systems Inf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coralline Algae
Coralline algae are red algae in the order Corallinales. They are characterized by a thallus that is hard because of calcareous deposits contained within the cell walls. The colors of these algae are most typically pink, or some other shade of red, but some species can be purple, yellow, blue, white, or gray-green. Coralline algae play an important role in the ecology of coral reefs. Sea urchins, parrot fish, and limpets and chitons (both mollusks) feed on coralline algae. In the temperate Mediterranean Sea, coralline algae are the main builders of a typical algal reef, the ''Coralligène'' ("coralligenous"). Many are typically encrusting and rock-like, found in marine waters all over the world. Only one species lives in freshwater. Unattached specimens ( maerl, rhodoliths) may form relatively smooth compact balls to warty or fruticose thalli. A close look at almost any intertidal rocky shore or coral reef will reveal an abundance of pink to pinkish-grey patches, distributed throu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bacteria
Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of Earth's crust. Bacteria are vital in many stages of the nutrient cycle by recycling nutrients such as the fixation of nitrogen from the atmosphere. The nutrient cycle includes the decomposition of dead bodies; bacteria are responsible for the putrefaction stage in this process. In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. Bacteria also live in symbiotic and parasitic relationsh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diatom
A diatom (Neo-Latin ''diatoma''), "a cutting through, a severance", from el, διάτομος, diátomos, "cut in half, divided equally" from el, διατέμνω, diatémno, "to cut in twain". is any member of a large group comprising several genera of algae, specifically microalgae, found in the oceans, waterways and soils of the world. Living diatoms make up a significant portion of the Earth's biomass: they generate about 20 to 50 percent of the oxygen produced on the planet each year, take in over 6.7 billion metric tons of silicon each year from the waters in which they live, and constitute nearly half of the organic material found in the oceans. The shells of dead diatoms can reach as much as a half-mile (800 m) deep on the ocean floor, and the entire Amazon basin is fertilized annually by 27 million tons of diatom shell dust transported by transatlantic winds from the African Sahara, much of it from the Bodélé Depression, which was once made up of a system of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metamorphosis
Metamorphosis is a biological process by which an animal physically develops including birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation. Some insects, fish, amphibians, mollusks, crustaceans, cnidarians, echinoderms, and tunicates undergo metamorphosis, which is often accompanied by a change of nutrition source or behavior. Animals can be divided into species that undergo complete metamorphosis (" holometaboly"), incomplete metamorphosis ("hemimetaboly"), or no metamorphosis (" ametaboly"). Scientific usage of the term is technically precise, and it is not applied to general aspects of cell growth, including rapid growth spurts. Generally organisms with a larva stage undergo metamorphosis, and during metamorphosis the organism loses larval characteristics. References to "metamorphosis" in mammals are imprecise and only colloquial, but historically idealist ideas of transformation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asterina (starfish)
''Asterina'' is a genus of asteroideans in the family Asterinidae. The species occurring in Australian waters are considered to not be congeneric with the type species ''A. gibbosa'' ( Pennant, 1777) by Rowe and Gates (1995), and will possibly to assigned to another genus or a new genus. Rowe and Gates (1995) also suggested that ''Asterina'' should be restricted to Atlantic waters.Rowe, F. & Gates, J. (1995). Echinodermata. In Wells, A. (Ed.), ''Zoological Catalogue of Australia'', Volume 33. Melbourne: CSIRO Australia. Species *'' Asterina fimbriata'' Perrier, 1875Perrier, E. (1875). ''Revision de la Collection de Stellerides du Museum d'Histoire Naturelle de Paris''. Paris: C. Reinwald. *''Asterina gibbosa'' ( Pennant, 1777) Pennant, T. (1777). ''British Zoology. Vol. IV. Crustacea. Mollusca. Testacea''. London: Benj. White. *'' Asterina gracilispina'' Clark, 1923Clark, H. L. (1923). The echinoderm fauna of South Africa. ''Annals of the South African Museum'', 13, 221–435. * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
