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Angolan Flying Squid
The Angolan flying squid (''Todarodes angolensis'') is a species of squid from the subfamily Todarodinae, part of the family Ommastrephidae. Due to taxonomic confusion with the Antarctic flying squid the exact limits of its distribution are uncertain but it is thought to be restricted to waters off Southern Africa. Description The Angolan flying squid has the typical cylindrical mantle shape of the Todarodine squids with arrow shaped fins. It does not have visceral photophores. The tentacular club has a short carpal area and has only four pairs of suckers, a number which is distinct for this species. The suckers in the middle part of the manus have 13 to 16 long, pointed teeth on their rings there are 14-18 suckers on the manus arranged in four rows. The tentacles also bear four rows of suckers, the largest of which have 14-17 conical teeth in their rings alternating with square plates. The rings of the suckers on the arms have large distal teeth which alternate with very sm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Louise Allcock
Louise Allcock is a British researcher, best known for her work on ecology and evolution of the cephalopods of the Southern Ocean and deep sea. She is the editor of the ''Zoological Journal of the Linnean Society''. Career and impact Allcock is the editor of the ''Zoological Journal of the Linnean Society'' and was co-editor of the ''Journal of Natural History'' from 2007 to 2015. She was the president of the Cephalopod International Advisory Council (CIAC) from 2012 to 2015. Allcock has also worked on gender equality, and is a member of the gender equality task force in Ireland. She has highlighted the role and impact of female researchers in cephalopod research. Allcock's research focuses on the ecology, evolutionary biology and systematics of molluscs. Her research expertise also lies in benthic ecology. She has participated in cruises in and around the Antarctic and the South Atlantic Ocean, sometimes as leader. As of summer 2016, she is working on taxonomically poor spong ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalopod Arm
All cephalopods possess flexible limbs extending from their heads and surrounding their beaks. These appendages, which function as muscular hydrostats, have been variously termed arms, legs or tentacles. Description In the scientific literature, a cephalopod ''arm'' is often treated as distinct from a ''tentacle'', though the terms are sometimes used interchangeably, often with the latter acting as an umbrella term for cephalopod limbs. Generally, arms have suckers along most of their length, as opposed to tentacles, which have suckers only near their ends.Young, R.E., M. Vecchione & K.M. Mangold 1999Cephalopoda Glossary Tree of Life web project. Barring a few exceptions, octopuses have eight arms and no tentacles, while squid and cuttlefish have eight arms (or two "legs" and six "arms") and two tentacles.Norman, M. 2000. ''Cephalopods: A World Guide''. ConchBooks, Hackenheim. p. 15. "There is some confusion around the terms ''arms'' versus ''tentacles''. The numerous l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Todarodes
''Todarodes'' is a genus of flying squid from the subfamily Todarodinae, of which it is the type genus. The genus contains five species which are partially allopatric but between them their distributions encompass most of the world's oceans and seas. These squid have a funnel groove with foveola, a hectocotylised fourth arm and tentacular stalks which lack free trabeculae. Species The following species are members of ''Todarodes'', with their vernacular names: *''Todarodes angolensis'' Adam, 1962 Angolan flying squid *''Todarodes filippovae'' Adam, 1975 Antarctic flying squid *'' Todarodes pacificus'' (Steenstrup, 1880) Japanese flying squid *''Todarodes pusillus The little flying squid (''Todarodes pusillus'') is a species of squid, one of the arrow squids of the genus ''Todarodes, in the subfamily ''Todarodinae of the flying squid Family (biology), family Ommastrephidae. It is a small species from the wa ...'' Dunning, 1988 little flying squid *'' Todarodes sagittatu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tree Of Life Web Project
The Tree of Life Web Project (ToL) is an Internet project providing information about the diversity and phylogeny of life on Earth. This collaborative peer reviewed project began in 1995, and is written by biologists from around the world. The site has not been updated since 2011, however the pages are still accessible. The pages are linked hierarchically, in the form of the branching evolutionary tree of life, organized cladistically. Each page contains information about one particular group of organisms and is organized according to a branched tree-like form, thus showing hypothetical relationships between different groups of organisms. In 2009 the project ran into funding problems from the University of Arizona. Pages and Treehouses submitted took a considerably longer time to be approved as they were being reviewed by a small group of volunteers, and apparently, around 2011, all activities ended. History The idea of this project started in the late 1980s. David Maddison ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cape Hake
''Merluccius capensis'' (shallow-water Cape hake or South African hake) is a ray-finned fish in the genus '' Merluccius'', found in the south-eastern Atlantic Ocean, along the coast of South Africa. It is a long, lean fish with a large head, similar in appearance to the European hake and the deep-water Cape hake. By day, it lives close to the bottom on the continental shelf and upper slope at depths not usually exceeding ; it makes a large, daily vertical migration rising at night to feed in the nectonic zone, and it also migrates southwards in spring and northwards in autumn. It is an important commercial fish species in southern Africa. Description Very similar to '' Merluccius merluccius'' (European hake) and '' Merluccius paradoxus'' (the deep-water Cape hake), ''M. capensis'' has an average length around 50 cm, up to a maximum around . It is a long, lean fish with a large head, light brown above and white or silvery below. The first dorsal fin has a single spine and 9 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Statocyst
The statocyst is a balance sensory receptor present in some aquatic invertebrates, including bivalves, cnidarians, ctenophorans, echinoderms, cephalopods, crustaceans, and gastropods, A similar structure is also found in '' Xenoturbella''. The statocyst consists of a sac-like structure containing a mineralised mass (statolith) and numerous innervated sensory hairs ( setae). The statolith's inertia causes it to push against the setae when the animal accelerates. Deflection of setae by the statolith in response to gravity activates neurons, providing feedback to the animal on change in orientation and allowing balance to be maintained. In other words, the statolith shifts as the animal moves. Any movement large enough to throw the organism off balance causes the statolith to brush against tiny bristles which in turn send a message to the brain to correct its balance. It may have been present in the common ancestor of cnidarians and bilaterians. Hearing In cephalopods like s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Flying Squid
The European flying squid (''Todarodes sagittatus'') is a species of squid from the continental slope and oceanic waters of the eastern Atlantic Ocean and the Mediterranean Sea. It is the type species of the genus ''Todarodes'', the type genus of the subfamily Todarodinae of the Oegopsida, pelagic squid family Ommastrephidae. It is a species which is targeted by some fisheries, although it is more often a bycatch. Description The European flying squid is a large species of squid with a maximum reported size of 750mm measured by mantle length for an unsexed specimen, while the largest mantle length known for a male is 640 mm. These animals commonly have mantle lengths of between 250mm and 350 mm. They have a slender, long and muscular Mantle (mollusc), mantle with terminal, wide and strong fins, the length of the fins being equivalent to 45% of the mantle length, and, when considered as a single fin unit, just slightly wider than it is long and tapering to a point poste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epipelagic
The photic zone (or euphotic zone, epipelagic zone, or sunlight zone) is the uppermost layer of a body of water that receives sunlight, allowing phytoplankton to perform photosynthesis. It undergoes a series of physical, chemical, and biological processes that supply nutrients into the upper water column. The photic zone is home to the majority of aquatic life due to the activity ( primary production) of the phytoplankton. The thicknesses of the photic and euphotic zones vary with the intensity of sunlight as a function of season and latitude and with the degree of water turbidity. The bottommost, or aphotic, zone is the region of perpetual darkness that lies beneath the photic zone and includes most of the ocean waters. Photosynthesis in photic zone In the photic zone, the photosynthesis rate exceeds the respiration rate. This is due to the abundant solar energy which is used as an energy source for photosynthesis by primary producers such as phytoplankton. These phytopla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Todaropsis Eblanae
''Todaropsis'' is a species of short finned squid in the family Ommastrephidae. It is the only genus in the monotypic subfamily Todaropsinae. The genus ''Todaropsis'' is also monotypic, containing the single species ''Todaropsis eblanae'', also known as the lesser flying squid. Description ''Todaropsis eblanae'' is a relatively small-sized squid between in length with a large, broad head.Emily Wilson 2006. Todaropsis eblanae. Lesser flying squid. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme n-line Plymouth: Marine Biological Association of the United Kingdom. The males grow to a maximum mantle length of 16.0 cm and the females to a maximum mantle length of . This species possesses a terminal fin which is broadly rhomboidal, wider than it is long and posteriorly rounded. Its arms are stout, more than twice the length of head, and the tentacle club is slim, with four rows of suckers, not extending away from the tips on to the sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benguela Current
The Benguela Current is the broad, northward flowing ocean current that forms the eastern portion of the South Atlantic Ocean gyre. The current extends from roughly Cape Point in the south, to the position of the Angola-Benguela Front in the north, at around 16°S. The current is driven by the prevailing south easterly trade winds. Inshore of the Benguela Current proper, the south easterly winds drive coastal upwelling, forming the Benguela Upwelling System. The cold, nutrient rich waters that upwell from around depth in turn fuel high rates of phytoplankton growth, and sustain the productive Benguela ecosystem. Boundaries Source waters for the Benguela include cold upwelled waters from the depths of the Atlantic Ocean close inshore, joined further off-shore by nutrient poor water that has crossed the Southern Atlantic from South America as part of South Atlantic Gyre. Eddies from the warm South Indian Ocean Agulhas current along South Africa's east coast come round the Ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Food And Agriculture Organization
The Food and Agriculture Organization of the United Nations; . (FAO) is a specialized agency of the United Nations that leads international efforts to defeat hunger and improve nutrition and food security. Its Latin motto, , translates to "let there be bread". It was founded on 16 October 1945. The FAO comprises 195 members, including 194 countries and the European Union. Its headquarters is in Rome, Italy, and it maintains regional and field offices worldwide, operating in over 130 countries. It helps governments and development agencies coordinate their activities to improve and develop agriculture, forestry, fisheries, and land and water resources. It also conducts research, provides technical assistance to projects, operates educational and training programs, and collects agricultural output, production, and development data. The FAO is governed by a biennial conference representing each member country and the European Union, which elects a 49-member executive cou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hectocotylised
A hectocotylus (: hectocotyli) is one of the cephalopod limb, arms of male cephalopods that is specialized to store and transfer spermatophores to the female. Structurally, hectocotyli are muscular hydrostats. Depending on the species, the male may use it merely as a conduit to the female, analogously to a penis in other animals, or he may Autotomy, wrench it off and present it to the female. The hectocotyl arm was first described in Aristotle's biology, Aristotle's biological works. Although Aristotle knew of its use in mating, he was doubtful that a tentacle could deliver sperm. The name ''hectocotylus'' was devised by Georges Cuvier, who first found one embedded in the mantle of a female Argonaut (animal), argonaut. Thinking it to be a helminths, parasitic worm, in 1829 Cuvier gave it a name of a biological genus, generic name (''Hectocotyle''), which is a New Latin term combining the Greek words for "hundred" (''hec(a)to(n)'') and for "hollow thing, cup" (''cotyle''). Structu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
