- The Metamorphosis
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- metamorphosis - Wiktionary
- On Translating Kafka’s “The Metamorphosis”
Some fish, both bony fish Osteichthyes and jawless fish Agnatha , undergo metamorphosis.
Fish metamorphosis is typically under strong control by the thyroid hormone. Examples among the non-bony fish include the lamprey. Among the bony fish, mechanisms are varied. The salmon is diadromous , meaning that it changes from a freshwater to a saltwater lifestyle. Many species of flatfish begin their life bilaterally symmetrical , with an eye on either side of the body; but one eye moves to join the other side of the fish — which becomes the upper side — in the adult form.
The European eel has a number of metamorphoses, from the larval stage to the leptocephalus stage, then a quick metamorphosis to glass eel at the edge of the continental shelf eight days for the Japanese eel , two months at the border of fresh and salt water where the glass eel undergoes a quick metamorphosis into elver, then a long stage of growth followed by a more gradual metamorphosis to the migrating phase.
In the pre-adult freshwater stage, the eel also has phenotypic plasticity because fish-eating eels develop very wide mandibles, making the head look blunt. Leptocephali are common, occurring in all Elopomorpha tarpon - and eel -like fish. Most other bony fish undergo metamorphosis from embryo to larva fry and then to the juvenile stage during absorption of the yolk sac, because after that phase the individual needs to be able to feed for itself.
In typical amphibian development, eggs are laid in water and larvae are adapted to an aquatic lifestyle.
Frogs , toads , and newts all hatch from the eggs as larvae with external gills but it will take some time for the amphibians to interact outside with pulmonary respiration. Afterwards, newt larvae start a predatory lifestyle, while tadpoles mostly scrape food off surfaces with their horny tooth ridges. Metamorphosis in amphibians is regulated by thyroxin concentration in the blood, which stimulates metamorphosis, and prolactin , which counteracts its effect.
Specific events are dependent on threshold values for different tissues. Because most embryonic development is outside the parental body, development is subject to many adaptations due to specific ecological circumstances. For this reason tadpoles can have horny ridges for teeth, whiskers, and fins. They also make use of the lateral line organ. After metamorphosis, these organs become redundant and will be resorbed by controlled cell death, called apoptosis. The amount of adaptation to specific ecological circumstances is remarkable, with many discoveries still being made. With frogs and toads, the external gills of the newly hatched tadpole are covered with a gill sac after a few days, and lungs are quickly formed.
Front legs are formed under the gill sac, and hindlegs are visible a few days later. Following that there is usually a longer stage during which the tadpole lives off a vegetarian diet. Rapid changes in the body can then be observed as the lifestyle of the frog changes completely. The animal develops a big jaw, and its gills disappear along with its gill sac.
Eyes and legs grow quickly, a tongue is formed, and all this is accompanied by associated changes in the neural networks development of stereoscopic vision, loss of the lateral line system, etc. All this can happen in about a day, so it is truly a metamorphosis. It is not until a few days later that the tail is reabsorbed, due to the higher thyroxin concentrations required for tail resorption.
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The Salamander development is highly diverse; some species go through a dramatic reorganization when transitioning from aquatic larvae to terrestrial adults, while others, such as the Axolotl , display paedomorphosis and never develop into terrestrial adults. Within the genus Ambystoma , species have evolved to be paedomorphic several times, and paedomorphosis and complete development can both occur in some species.
In newts, there is no true metamorphosis [ citation needed ] because newt larvae already feed as predators and continue doing so as adults.
Newts' gills are never covered by a gill sac and will be resorbed only just before the animal leaves the water. What made you want to look up metamorphosis?
metamorphosis - Wiktionary
Please tell us where you read or heard it including the quote, if possible. Test Your Knowledge - and learn some interesting things along the way. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Getting down to what's under the surface. A suffix that stinks of corruption. This list is not FDA-approved.
- Metamorphosis dictionary definition | metamorphosis defined.
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On Translating Kafka’s “The Metamorphosis”
How to use a word that literally drives some people nuts. The awkward case of 'his or her'. It's a bird? It's a plane? No, I'm really asking. What is it? Test your vocabulary with our question quiz! Definition of metamorphosis. Examples from the Web for metamorphosis Metamorphosis is running at Lincoln Center, 63rd Street and 9th Avenue, until January 11, Back to Blackface? Life of Elie Metchnikoff, Olga Metchnikoff. A marked change in appearance, character, condition, or function. A change in the form and often habits of an animal during normal development after the embryonic stage.
Metamorphosis includes, in insects, the transformation of a maggot into an adult fly and a caterpillar into a butterfly and, in amphibians, the changing of a tadpole into a frog. A usually degenerative pathological change in the structure of a particular body tissue. Published by Houghton Mifflin Company. Dramatic change in the form and often the habits of an animal during its development after birth or hatching.