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Euphausiacea
Krill are small crustaceans of the order (biology), order Euphausiacea, and are found in all the world's oceans. The name "krill" comes from the Norwegian language, Norwegian word ', meaning "small Fry (biology), fry of fish", which is also often attributed to species of fish. Krill are considered an important trophic level connection – near the bottom of the food chain. They feed on phytoplankton and (to a lesser extent) zooplankton, yet also are the main source of food for many larger animals. In the Southern Ocean, one species, the Antarctic krill, ''Euphausia superba'', makes up an estimated biomass (ecology), biomass of around 379,000,000 tonnes, making it among the species with the largest total biomass. Over half of this biomass is eaten by whales, Pinniped, seals, penguins, seabirds, squid, and fish each year. Most krill species display large diel vertical migration, daily vertical migrations, thus providing food for predators near the surface at night and in deeper w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Krill
Northern krill (''Meganyctiphanes norvegica'') is a species of krill that lives in the North Atlantic Ocean. It is an important component of the zooplankton, providing food for whales, Pinniped, seals, fish and birds. (In the Southern Ocean, Antarctic krill ''Euphausia superba'' fills a similar role.) ''M. norvegica'' is the only species recognised in the genus ''Meganyctiphanes'', although it has been known by several synonym (taxonomy), synonyms: *''Euphausia intermedia'' *''Euphausia lanei'' Holt & Tattersall, 1905 *''Meganyctiphanes calmani'' *''Nyctiphanes norvegicus'' G. O. Sars, 1883 *''Thysanopoda norvegica'' References External links * * * * Krill Crustaceans of the Atlantic Ocean Crustaceans described in 1856 {{Malacostraca-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nematoscelis
''Nematoscelis'' is a genus of krill, containing the following species: *''Nematoscelis atlantica'' Hansen, 1910 *''Nematoscelis difficilis'' Hansen, 1911 *''Nematoscelis gracilis'' Hansen, 1910 *''Nematoscelis lobata'' Hansen, 1916 *''Nematoscelis megalops'' G. O. Sars, 1883 *''Nematoscelis microps'' G. O. Sars, 1883 *''Nematoscelis tenella ''Nematoscelis'' is a genus of krill, containing the following species: *''Nematoscelis atlantica'' Hansen, 1910 *''Nematoscelis difficilis'' Hansen, 1911 *''Nematoscelis gracilis'' Hansen, 1910 *''Nematoscelis lobata'' Hansen, 1916 *''Nemato ...'' G. O. Sars, 1883 References Krill Crustacean genera Taxa named by Georg Ossian Sars {{Malacostraca-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thysanopoda
''Thysanopoda'' is a genus of krill Krill are small crustaceans of the order Euphausiacea, and are found in all the world's oceans. The name "krill" comes from the Norwegian Norwegian, Norwayan, or Norsk may refer to: *Something of, from, or related to Norway, a country in n ..., containing the following species: *'' Thysanopoda acutifrons'' Holt & Tattersall, 1905 *'' Thysanopoda aequalis'' Hansen, 1905 *'' Thysanopoda astylata'' Brinton, 1975 *'' Thysanopoda cornuta'' Illig, 1905 *'' Thysanopoda cristata'' G. O. Sars, 1883 *'' Thysanopoda egregia'' Hansen, 1905 *'' Thysanopoda microphthalma'' G. O. Sars, 1885 *'' Thysanopoda minyops'' Brinton, 1987 *'' Thysanopoda monacantha'' Ortmann, 1893 *'' Thysanopoda obtusifrons'' G. O. Sars, 1883 *'' Thysanopoda orientalis'' Hansen, 1910 *'' Thysanopoda pectinata'' Ortmann, 1893 *'' Thysanopoda spinicaudata'' Brinton, 1953 *'' Thysanopoda tricuspidata'' Milne-Edwards, 1837 References External links * Krill Crustacean gene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stylocheiron
''Stylocheiron'' is a genus of krill Krill are small crustaceans of the order Euphausiacea, and are found in all the world's oceans. The name "krill" comes from the Norwegian Norwegian, Norwayan, or Norsk may refer to: *Something of, from, or related to Norway, a country in n ..., containing the following species: *'' Stylocheiron abbreviatum'' G. O. Sars, 1883 *'' Stylocheiron affine'' Hansen, 1910 *'' Stylocheiron armatum'' Colosi, 1917 *'' Stylocheiron carinatum'' G. O. Sars, 1883 *'' Stylocheiron elongatum'' G. O. Sars, 1883 *'' Stylocheiron indicum'' Silas & Mathew, 1967 *'' Stylocheiron insulare'' Hansen, 1910 *'' Stylocheiron longicorne'' G. O. Sars, 1883 *'' Stylocheiron maximum'' Hansen, 1908 *'' Stylocheiron microphthalma'' Hansen, 1910 *'' Stylocheiron robustum'' Brinton, 1962 *'' Stylocheiron suhmi'' G. O. Sars, 1883 References Krill Crustacean genera Taxa named by Georg Ossian Sars {{Malacostraca-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nyctiphanes
''Nyctiphanes'' is a genus of krill, comprising four species with an anti-tropical distribution. Based on molecular phylogenetic analyses of the cytochrome oxidase gene and 16S ribosomal DNA, ''Nyctiphanes'' is believed to have evolved during the Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recen .... References Krill Crustacean genera Taxa named by Georg Ossian Sars {{Malacostraca-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bentheuphausia
''Bentheuphausia amblyops'', the deep sea krill is a species of krill. ''B. amblyops'' is the only species within its genus, which in turn is the only genus within the family Bentheuphausiidae. All the 85 other species of krill known are classified in the family Euphausiidae. Distribution ''B. amblyops'' occurs in the northern Atlantic Ocean in latitudes south of 40° N, and also in the southern seas of the Atlantic, in the Indian Ocean and in the Pacific. It is a bathypelagic krill that lives in deep waters below . Description It is distinguished from the Euphausiidae by several morphological features, the most apparent being that they are not bioluminescent and that their first pair of pleopod The decapod ( crustaceans such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon (abdomen). Each segment may possess one pair of appendages, although in various ...s is not modified as copulator ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustacean
Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods emerged deep in the Crustacean group, with the completed group referred to as Pancrustacea. Some crustaceans (Remipedia, Cephalocarida, Branchiopoda) are more closely related to insects and the other hexapods than they are to certain other crustaceans. The 67,000 described species range in size from '' Stygotantulus stocki'' at , to the Japanese spider crab with a leg span of up to and a mass of . Like other arthropods, crustaceans have an exoskeleton, which they moult to grow. They are distinguished from other groups of arthropods, such as insects, myriapods and chelicerates, by the possession of biramous (two-parted) limbs, and by th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meganyctiphanes
Northern krill (''Meganyctiphanes norvegica'') is a species of krill that lives in the North Atlantic Ocean. It is an important component of the zooplankton, providing food for whales, seals, fish and birds. (In the Southern Ocean, Antarctic krill ''Euphausia superba'' fills a similar role.) ''M. norvegica'' is the only species recognised in the genus ''Meganyctiphanes'', although it has been known by several synonyms A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are all ...: *''Euphausia intermedia'' *''Euphausia lanei'' Holt & Tattersall, 1905 *''Meganyctiphanes calmani'' *''Nyctiphanes norvegicus'' G. O. Sars, 1883 *''Thysanopoda norvegica'' References External links * * * * Krill Crustaceans of the Atlantic Ocean Crustaceans described in 1856 {{Malacostraca-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctic Krill
Antarctic krill (''Euphausia superba'') is a species of krill found in the Antarctic waters of the Southern Ocean. It is a small, swimming crustacean that lives in large schools, called swarms, sometimes reaching densities of 10,000–30,000 individual animals per cubic metre. It feeds directly on minute phytoplankton, thereby using the primary production energy that the phytoplankton originally derived from the sun in order to sustain their pelagic (open ocean) life cycle. It grows to a length of , weighs up to , and can live for up to six years. It is a key species in the Antarctic ecosystem and in terms of biomass, is one of the most abundant animal species on the planet (approximately 500 million tons, corresponding to 300 to 400 trillion individuals). Life cycle The main spawning season of Antarctic krill is from January to March, both above the continental shelf and also in the upper region of deep sea oceanic areas. In the typical way of all krill, the male attaches a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euphausia
''Euphausia'' is the largest genus of krill, and is placed in the family Euphausiidae. There are 31 species known in this genus, including Antarctic krill (''Euphausia superba'') and ice krill ('' Euphausia crystallorophias'') from the Southern Ocean, and North Pacific krill (''Euphausia pacifica'') in the Pacific Ocean. *''Euphausia americana'' Hansen, 1911 *'' Euphausia brevis'' Hansen, 1905 *'' Euphausia crystallorophias'' Holt & Tattersall, 1906 *''Euphausia diomedeae'' Ortmann, 1894 *'' Euphausia distinguenda'' Hansen, 1908 *''Euphausia eximia'' Hansen, 1911 *'' Euphausia fallax'' Hansen, 1916 *'' Euphausia frigida'' Hansen, 1911 *''Euphausia gibba'' G. O. Sars, 1883 *''Euphausia gibboides'' Ortmann, 1893 *'' Euphausia hanseni'' Zimmer, 1915 *'' Euphausia hemigibba'' Hansen, 1910 *''Euphausia krohnii'' (Brandt, 1851) *''Euphausia lamelligera'' Hansen, 1911 *''Euphausia longirostris'' Hansen, 1908 *''Euphausia lucens'' Hansen, 1905 *''Euphausia mucronata'' G. O. Sars, 1883 *'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phytoplankton
Phytoplankton () are the autotrophic (self-feeding) components of the plankton community and a key part of ocean and freshwater ecosystems. The name comes from the Greek words (), meaning 'plant', and (), meaning 'wanderer' or 'drifter'. Phytoplankton obtain their energy through photosynthesis, as do trees and other plants on land. This means phytoplankton must have light from the sun, so they live in the well-lit surface layers (euphotic zone) of oceans and lakes. In comparison with terrestrial plants, phytoplankton are distributed over a larger surface area, are exposed to less seasonal variation and have markedly faster turnover rates than trees (days versus decades). As a result, phytoplankton respond rapidly on a global scale to climate variations. Phytoplankton form the base of marine and freshwater food webs and are key players in the global carbon cycle. They account for about half of global photosynthetic activity and at least half of the oxygen production, despite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zooplankton
Zooplankton are the animal component of the planktonic community ("zoo" comes from the Greek word for ''animal''). Plankton are aquatic organisms that are unable to swim effectively against currents, and consequently drift or are carried along by currents in the ocean, or by currents in seas, lakes or rivers. Zooplankton can be contrasted with phytoplankton, which are the plant component of the plankton community ("phyto" comes from the Greek word for ''plant''). Zooplankton are heterotrophic (other-feeding), whereas phytoplankton are autotrophic (self-feeding). This means zooplankton cannot manufacture their own food but must eat other plants or animals instead — in particular they eat phytoplankton. Zooplankton are generally larger than phytoplankton, most are microscopic, but some (such as jellyfish) are macroscopic and can be seen with the naked eye. Many protozoans (single-celled protists that prey on other microscopic life) are zooplankton, including zooflagellates, fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
