Insect eggs from hatching out of the young organism, with the long-shape into a different insects.
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Outline
幼虫 概述
Broadly speaking, the larvae are quite animal ontogeny morphological and physiological characteristics and developmental stages of embryonic nature. Larvae generally have proprietary organ or temporary structure to accommodate the needs of its own lifestyle, but under the direct form of larvae development does not have this situation. Very few vertebrate urochordate and many invertebrates ontogeny categories are experienced larval stage. Some only a larval stage, such as New York, cap-shaped larvae different animals, animals outside the anus after Bay sea squirt tadpole larvae and larvae. Ontogeny some animals containing multiple larvae; If there are two angles shellfish larvae: trochophora and veliger false leafy tapeworm larvae have three: hook the ball larvae, larvae and the whole tail end of the original larvae; There are four larval sea cucumber: early gastrula type larvae, ear-shaped larvae, larvae and five-barrel release larvae; while mussel larvae actually be broken down into five: trochophora, veliger embryo shell surface disk larvae, with eye-point and creeping foot veliger veliger. Arthropods, the number of stages and their larvae molt several relevant. Insect embryos shell nymphs molt in each time period is called the age of the worm. If there are five instar grasshopper period, while insects like mayflies in the environmental impact of the worm may have no peers, were less five, more are up to 27. From an evolutionary perspective, the larvae of species from the category belongs to its own development path in a creation. Some larvae of all animals grouped into two categories: early and late larvae larvae. Early larval germline larvae, also known as dual-sac larvae, cap-like larvae, larvae and spoke wheel trochophora so on. Some forms of these larvae have some basic similarities in their respective categories and the. For example Oligochaeta there and polychaete trochophora similar developmental stages. In contrast, the advanced form of the difference between the different types of larvae appears even with the door as much as the difference between the body. Jellyfish larvae, leeches suck, tapeworms, crustaceans and echinoderms and other types of animals are late larvae. After the larvae develop into adult experiences called metamorphosis. In case there are several larval stages, each morphological changes are associated with changes in lifestyle are closely linked. Sexual and asexual generations generation larvae moon jellyfish larvae appeared in different seasons respectively planktonic life and adhesion of life. Its first form planula intestinal worm-like larvae after attachment, and then developed to represent polyp generation goblet body, then the body is the transition from the water goblet parent generation. Then goblet somites crack is stacked plate body, followed by the free end of the latter and then falling down a dish of larvae body. After a period of planktonic life, disk-shaped body grew to adult animals. Two generations of moon jellyfish larvae into the body and all though the same genotype but different phenotypes, resulting in different patterns. Larval metamorphosis results generally produce small body into a body of individuals, is called larvae. However, some animals in ontogeny, go through a transition period, ie between the larval stage larvae to juveniles. Examples of this are many, such as the absorption of Wag leech larvae larval mussel lines, long eye stalk cherry shrimp larvae, the larvae of shrimp and crab larvae and other big eyes. Features in the larval stage: While most adult organs have begun to grow, but has not yet reached a size and scale body. In addition, some remnants or performance of certain larvae larval ecology organ still exists.
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The study of history
Our history, is the first to be recognized silkworm larvae. Before the 12th century BC, between 16 to Yin, the Chinese silkworm Jibei shape carving on shells and the emergence of a hieroglyphic text of "Silkworm" word. In the West, 17th century leaves a. van Leeuwenhoek discovered newly hatched Cyclops differs greatly from the adult, beginning after Dwyer study confirmed larvae. Some full of animals such as water fleas larvae and larval megalopa though has been found in the 1780s, but by the early 19th century are still being treated as adult animals, until the 1830s before they get corrected. 1832 c. g. After Ehrenberg Discovery Cove larvae and named in 1834, then put it as a wheel-shaped animals, until the beginning of 1869 a. Schneider confirmed to external anal animal larvae. j. p. Maitreya bracket larvae found in 1846, in 1847 found that a cap-like larvae, 1848 spoke wheel found larvae in 1850 found that the larvae spin the wheel and be named separately. Which spoke wheel stand larvae larvae and also initially mistaken for adult animals, j. p. I confirm that Maitreya is indeed stand tail animal larvae larvae, and the other by the c. Gergen spoke wheel Bauer determine broom larvae larvae. 1840 s. Rowan first discovered a significant position in the evolution trochophora, tentative named Rowan larvae was renamed after the ball round the larvae start to 1878 by the b. Ha Qieke changed to its present name. To the 19th century, most of the categories in the form of a common representative and larvae have been documented more specific, such as: two bottles sponge sac larvae; solid white sticks sponge larvae; multi intestinal classes; cnidarians in planula Maitreya's Gert's larvae and larvae; ciliated larvae suck like leeches, larvae and Wag Reddy's larvae; six tail hook sac larvae and larval tapeworm; New York Desha's animal-shaped larvae; polychaete larvae in the hat ; brachiopods the umbrella larvae; there are larvae of certain insects; crustaceans and echinoderms larvae larvae and limb feather wrist wrist larvae. c. r. Darwin's Origin of Species theory has a great influence on the understanding and interpretation of causality and meaning of larvae produced, leading to many famous embryologist use to illustrate the process of larval morphogenesis evolutionary history of species and genetic relationship between animals of different classes, and promote the comparative embryology school development. On the one hand due to the impact ontogeny and phylogeny theory, on the other hand due to the large number of larvae found in similar form, b.哈切克 proposed trochophora said in 1878. Think trochophora is a progenitor body animal - trochophora animals (trochozoon) left a "living fossil." He believes that almost all of the existing symmetric animals (bilateria) are derived from the imaginary ancestors. 1952 b. h. Do 克列米舍夫 will act as a total gate round the animal can be said trochophora say the inheritance and development. Links, software, 螠 insects and esculenta are attributed to the total under the door, while their larvae are also referred to as trochophora. To the mid-20th century, l. h. Hyman at the time of the animal kingdom lineage relationships remain the trochophora style is the starting form 螠 ancestors as insects, esculenta, broom insects, external anal, links, software, and arthropods and many other animals. She also planula body style as the entire animal kingdom ancestral lineage tree backbone that all true metazoans (eumetazoa) are developed from the basis of the ancestral morphology made. j. Haji believes that similar larvae form a variety of animals may actually be the same phenomenon in the functional living environment needs. Such as raw or cone-shaped larvae gyro system and sensory cilia and the top ring of Chengdu and the water environment and ground gravity related, but this similarity and they can not cover their unique morphological characteristics. Such as annelids and mollusks trochophora trochophora most similar, but the evolutionary relationships among them the depth of what it is worth to be studied. There is at least one important difference: annelids trochophora mesoderm from the beginning it did not occur from excessive contact with the body section generated, and signs in the event of mollusks trochophora period mesoderm who had no undue Festival. Before the second half of the 20th century, only a comparative study of embryology and evolution of animal embryology larvae of a part. To 1950 g. Tuer Song larval ecology research first proposed, and the ecology of marine larvae into two groups: Huang Yang Yang floating planktonic larvae and planktonic larvae. 1972 c. a. Mi Lieyi Khodorkovsky marine larvae turn upgraded to marine organisms in a unique ecological groups - the larvae of marine creatures (pelegiclarvaton), and put it with the benthic organisms (benthos), nekton (nec-ton), hydroplaning organisms (pleuston) and plankton (plankton) and so tied. Meanwhile larval ecology and development, the rise of the larvae taxonomy. The latter is in the same category in the content of the larvae divided into several types, the second is the use of larval morphology to identify their respective adult species. As an old 1962 Miyazaki according to the shape and characteristics of the shell will be more than 200 kinds of bivalves veligers grouped into 20 types of mussels, oysters, clams and razor clams and other screens. r. h. Miller is based primarily on the attached form, the larvae are not carried into the body primordia and sprouting body born tadpoles situations such as the sea squirt larvae into 28 types. Larval morphological identification using an adult kind of work, k. w. Oak Coleman has used top form after bivalves shell larvae first one to speculate larval shell (or embryo shell Ⅰ) and the first two larval shell (or shell embryo Ⅱ) generation of morphological changes, and the after comparing extrapolated for an adult category. v. l. Rosen Ivanov and others in accordance with the outline veliger shell, shell top muster degree, a high proportion of shell length and width of the narrow edge of the shell and ligaments around the hinge position and shape of the 20 kinds of conditions identified in North America Lamellibranchia animals. Through the more than 3,000 articles summarized, 1982 d. e. Bliss has developed three aspects of crustaceans retrieval table, namely: use of embryonic appendages to the separation of the various forms of larvae and juveniles of the keys; using nauplii appendages and carapace of crustaceans major morphological separation subclass tables and use the search form Zoea larvae are separated, mesh, or subfamily suborder crustacean retrieval table. 1978 m. j. Westfall addition to adult and nymph Dragonfly mesh retrieval sheet also made to identify and distinguish Dragonfly nymphs and Odonata nymphs keys.
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Larvae mode
Embryos and larvae pattern consistent pattern, animal larvae divided into: ① in the blastocyst-like larval levels, based on the structure surrounded by a monolayer, there is no layer of the embryo, such as double balloon sponges larvae. ② larvae from the two layers of the embryo, such as planula, which is enclosed by the surface ectoderm and internal parasites living cell mass, neither the lumen nor openings. n. n. Meiqi Kafelnikov said that this is the real larvae larvae, also appeared in the sponge animals. This corresponds to the inner cell mass of the digestive tract are not fully primordia, which is not equivalent to the endodermal and mesodermal within quite similar. ③ no body cavity of the larvae of three germ layers, such as multi-class Maitreya's intestinal absorption leeches larvae and larvae; Maitreya's larvae once existed at the beginning of the occurrence of cavities (blastocyst cavity), but soon filled by mesenchymal cells and digestive increased branching and disappear. Larvae suck vermiculite filler in addition to the substance as well as a large number of germ cells and germ cell clusters. Trochophora larvae ④ three germ layers have fake body cavity, such as links, esculenta, and software and other types of animals, cap-like insect larvae Zealand, anal animal larvae and larvae of the Back Bay. They are composed of a single layer of ectodermal cells in the body wall, students have a simple digestive tract in vivo. That lacuna living prosthesis cavity between the wall and the digestive tract. This cavity is actually survived the blastocyst cavity. Such larvae are mainly circular motion organ cilia wheel, located larval mouth before oral cilia who said before the round: in the peripheral rim were mostly called cilia crown. ⑤ three germ layers larval sac with true body cavity, such as the larvae of brachiopods, echinoderms larvae and stigma larvae. These larvae are cystic structure coelomosac intestine protrudes part of the original formation. This coelomosac right and left sides only separated larval digestive tract, and each divided into before, during and after the three parts. Rear body cavity which is the base of adult stem cavity happen? 4 get Guo loopholes chew myself cadmium Zhuang Xian Bei Minamata disease brain Shuo Huang Si nephew awakened latent testifies Xing Bin heir resistant frog? In evolutionary history, the larvae need to adapt to the environment, in order to obtain nutrition security, and to expand the scope of activities for the successful completion of metamorphosis and keep in shape and create some variation. If proprietary organs appear - new sex occurs, organ postpone or advance the time of birth - metachronous and gonadal puberty - and so are the immature stage of maturity of its content. There are many cases described occurred from direct or indirect role in the occurrence of larval organs and their way into the body organs. Because the fate of the larval organs following aspects: ① disappear completely, break, ② or without transformation after transformation and becomes a part of the body organ; ③ completely preserved, but the change in the structure and physiological function.
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Larval morphology
Larvae system can be divided into radial symmetry and symmetrical. Dual-sac larvae, larvae implemented, planula, Hydra insects radiation in larvae of the red nucleus tube jellyfish larvae and coral larvae are of radiation in symmetrical Edward larvae; ball comb comb jellyfish larvae for two radial symmetry larvae. In addition, all three germ layers larvae are symmetrical type larvae. Adult echinoderms radial symmetry system, but its larvae are symmetrical. e. w. McBride larval morphological characteristics according imaginary echinoderms and chordates Hemichordata common ancestral origin called symmetric larvae (dipleurula) of this ancestor with trochophore position in the evolution of animal roughly the same. Larvae region and somites esculenta, 螠 insects and mollusks trochophora can distinguish three individual zones: front wheel cilia mouth area, front wheel and back wheel area. Division alone annelid trochophora three individual areas with this difference: the roof, the first round of the mouth and oral cilia recessed area composed of ciliated round before the mouth area, by the end of the cilia wheel, anus and anal anal area after area composed and between the growth zone between the two districts. Some polychaetes (Ryusuke Branch, Nereis Branch, Rocky Nereis Branch) late trochophora from the growth zone and then another section to give birth to three larvae. Other somites system after successive larval birth and called somites somites larvae or trunk somites. Mesoderm formation of somites from larval mesoderm mother cell; somites formed after the larvae but mesoderm cells derived from ectodermal parasites backend. Larvae early unsegmented mesoderm, ectoderm after sub-section under the influence before they have changed. Larvae somites no fat cells and vascular cells on yellow, nor produce germ cells. These two different sources somites are p. p. Ivanov called somites generated by different legal nature. This law is also different in some decapods larval development. Mesoderm and ventral nerve cord 螠 Gang trochophora had once watched festival phenomenon, but it was too soon, when the end of the line at the larval stage disappears. Locomotor larvae often become the most prominent organ of the body surface, but it is also to be discarded or perverted engineered organs. This organ is both species-specific, while labeling the different activities of the larvae have their own unique habits. The most common larval organ is ciliated organ movement, its morphology, growth patterns, and increased with the number of different types of larvae. The most common and has a more important feature is the top cilia bundle. Forward and backward movement and the larvae are aware of the surrounding environment and on top of the cilia beam. In addition to having the top of the Back Bay ciliated larvae extrapyramidal also give birth to another swing from the bottom of the front body cilia bundle. The latter can explore the marine sediment adhering to _select_ locations. Green sea anemone planula backend cilia bundle (Figure 16) also has a similar effect. Ciliated organ larvae appear to be very common form of ciliary band. Some cilia and larvae with the long axis parallel to said longitudinal body with cilia. Polychaete worms and 螠 trochophore larvae with special vertical ciliary nerve area called cilia belt. And ciliary body axis perpendicular to the ring with the location and number of species varies due to the larvae. The main ring of cilia with polychaete trochophora is cilia round before the mouth, and some of both the port and terminal cilia cilia round round. Only the first round of oral cilia who can be called a single hair round larvae, both ends of cilia round and only those points after the opening round of ciliated larva called terminal hair and the hair round larvae. Particularly evident in the absence of cilia round and most of those who called cilia throughout the body surface hairless wheel larvae or larvae of raw wool wheel. So, in two or more annular surface with those who are called cilia round hairy larvae. If the projections in the larval body parts covered with cilia, locomotor formed more efficiently and make more unique larval morphology. As Maitreya's larvae and larvae cilia Gert leaves, leaf side cap larvae, veliger face plate, tentacles and sea urchin larvae and stigma bracket spin round worm larvae larvae wrist spoke wheels are some of the examples. Some larvae even a special form of moving organs named. In addition to ciliated organ, the bristles and specialized appendages are also a variety of aquatic larvae moving organs. The former swim hair found in polychaete larvae, which is found in crustacean larvae. Nereis larvae swim hair (also known as warts foot larvae) to bristle warts on the foot as swimming organs. Some hairy larvae swim in the section to give birth to three larvae (or hairy section) performed after metamorphosis, but some sections after birth and more individuals are still preserved many larval organs, then bristly larvae still works. Each pair of appendages crustaceans (except swimming foot) commonly occurs in the process to have been used as organ movement. If nauplii big jaw, zoea larvae antennae, legs and chest foot jaw, chest mysis larvae larvae and leafy enough and Venus larvae pereiopods been true. In the case of the foot can also be seen as a moving organ veliger and insects bivalves in the Arma-shaped larvae. And veliger can only be attached to the foot of the creeping crawling on the ground, and it can be used Arma-shaped larvae chest and abdomen original enough to act quickly enough. Larvae digestive tract are generally simple u-tube connection port front esophagus, the middle of the stomach, the intestinal segment. Only fetlock Maitreya's larvae and larval digestive tract branching. Lamellibranchia animal's digestive tract trochophora particularly to the back arched, which occurred from the shell gland induction effect. Multi-intestinal larvae digestive tract only port holes without anal holes. Prosthesis lumen three germ layers larval mouth recess formed in a position Haraguchi, their original structure anal newborn. But in the true body cavity three germ layers larvae, the situation with more than the opposite: to generate original anal Haraguchi position at the mouth of newborn concave structure. Namely the main basis protostomes and deuterostomes distinction. Digestive gland occurs later time, known occurred in the liver prior to the gills class veliger distort the body during crystal rod Lamellibranchia sac occurs in creeping foot veliger stage. There are many larvae excretory organs is the original renal tubular excretory organs in the larvae have a left and right side of the body. Leech sucked all of the original tail tapeworm larvae and larvae by a number of former flame renal tubular cells, tapeworm larvae and six hooks anal animal larvae contain only one original flame renal tubular cells. Polychaete trochophora, spoke wheel broom insect larvae and worms trochophora Yi original renal tubular cells by having the tube. As the larvae grow the number of such cells excretion increased by one to ten months. Bivalve larvae, consisting of the original kidney tubule cells have disappeared and only a metamorphosis. Renal tube esculenta trochophora period there appear. More specific forms of larval excretory organs are not the same in name, structure and generating position, such as limpets veliger anal cells, some of the animals prior to the gills veliger excretion cell mass and the gills of the original animal veligers kidney and secondary kidney. Only by a pair of original kidney kidney cells, secondary kidney by several large vacuoles containing the cells. Ectodermal cap-like larvae can accumulate metabolites during embryonic development, but also for gas exchange, it is considered to have the excretion function. In metamorphosis due to the disappearance of the ectoderm disappear after this function. Circulatory organs ascidian tadpole larvae before metamorphosis that give birth to the heart, in this case failed to invertebrate larvae appeared. Some animals before Gill veliger larvae of birth of a heart (or Heart sac) a temporary sexual organs (Figure 20), disappeared in metamorphosis. Its occurrence location is in the middle, and after the larvae back face plate. Take heart sac expansion and contraction movement of oxygenated blood to the face plate to the surrounding viscera. From the larval stage began permanent vascular phenomenon found only spoke wheel larvae. Nervous system and sensory organs without body cavity three germ layers larvae and prosthetic lumen three germ layers larvae roof that is the earliest sense organs, but also the brain knot groups happen? T Dang trouble han B Zhong Zhuang Di ⑸ school secluded meteorite hole in a wall Wei ǔ benches Carolina hole in a wall Song evil marsh group Pa Little F rendering armed pastoral mash Essentials hole in a wall mo Zhuang Wei of fear Xing furosemide Min Greek cries Min Department of deserted Da shares hole in a wall tanning ⑸ N Hun Han B Zhong Zhuang Xian that Yue Wokesongchi ? Larval sensory organs are mainly eye and balance sac. A variety of structures and the number of larvae with a certain eye points, such as tapeworm larvae and crustaceans wag nauplii only one eye point; esculenta trochophora and Gill have two classes veligers, vermiculite ciliated larvae suck 2 to 3, a plurality of Maitreya's larvae. Most points in larval metamorphosis in the eyes disappear, some bivalves in veliger eye point of birth can be retained to adult animals. True jellyfish balance sac larvae occur in the body of the disc, the feeling of balanced stones sac cavity top wall cells secrete stick form. Gill classes and bivalves veliger balance sac at the beginning of full retraction occurs on both sides of the front surface of the base appears, then sunk deeper healing after beginning to become ectodermal sac. The vast majority of animal phyla larval stage of the reproductive organs do not form the gonads, but in a few schema (suction vermiculite, tapeworm, crustaceans, insects), gonads than occurred in the larval stage, and even mature in the larval stage of the phenomenon. If leeches suck each stage larvae have germ cells, and the cells split into groups. Each encapsulated larvae develop into germ cell group is directly stacked Ray larvae (Figure 19), which the body can be many groups of germ cells to develop into larvae or wag generation larvae mine stack. In the tapeworm class, a kind of cup raw tail tapeworm larvae on birth gonads. Another all-round leafy tail tapeworm larvae body has not only generated egg, and even a small larvae hatch the egg membrane. Amphipoda jump the ditch in the development of insect eggs be incubated in the bag, this is called the incubation support under yellow larval development type. This newly hatched larvae in the egg membrane already have gonads. This molt twice before by the sex glands can be determined. When the insect instar stages of development, the gonads are constantly developing and pharyngeal secretions of the body is controlled by the side. With the arrival of gonadal body into the final period to mature.
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Significance
Larvae are animals ontogeny a child to be part of. Its environmental and nutrient conditions, there are strict requirements, if a little is not satisfied, it can not complete the transition to adult. It follows that the larvae are most sensitive animal life ring is very fragile stage. This happens to human beings the opportunity to take advantage of. Way as to try to cut off the larvae enter the host infectious parasitic disease can control; would destroy agricultural pests in the larval stage can protect the growing crops; reduce or eliminate the larvae attached to the substrate can make marine equipment from fouling and mass culture of larvae can successfully expand economic and other artificial breeding of animals. Based on the accumulation of large amounts of data, animal larvae can be divided into four ecological types: parasitic larvae, the larvae of terrestrial, freshwater and marine larvae larvae. In addition to the parasitic larvae commonly seen in outline and Cestoda leech sucked outward in other categories also have a certain number. Larvae from terrestrial to Insecta who mainly focused on freshwater crustacean larvae generally and aquatic insects. Unique diversity of marine larvae on much more than the other three classes, which marine animals in the relevant categories than terrestrial animals. Not only morphological diversity of marine larvae and mostly on the evolution of representative. Moreover, the situation of many marine animals and marine animals with a larval stage with multiple larval stage of the case has also caused a marine larvae hand characteristics. As we all know, the vast oceans to become Ranching places, mainly by plankton populations as productive, and planktonic larvae is the main component. As a secondary or tertiary productivity, which is necessary for many large economic animal feed, is an important part of the ocean food chain. In addition, marine larvae also convert organic matter in the ocean, transfer and circulation play a role. Many perennial benthic animals accumulated nutrients in larval form, after all, to be within a certain range of time and space to rise to the surface or water currents brought to the distance, in order to make the next generation of widely distributed. It is estimated that the French Atlantic coast Arcachon (arcachon) region barnacle egg output of about 49 tons. As many studies generated by the egg larvae can survive, sink, metamorphosis and _set_tle down as a new generation into the body, which depends on the prevailing weather, currents, water quality, nutrition and predators, such as a series of objective criteria to decide. In fact this is the decision of all marine organic matter (including larvae and all organisms) conversion, transfer and circulation of the main conditions. To learn about all aspects of marine organic matter knowledge, understanding of the law in the ocean have an important reference value.
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Encyclopedia
youchong Larvae larva ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ Outline The study of history Larvae mode Institutional larvae larvae larvae form somites locomotor region and Digestive excretory organs Nervous system and sensory organs cycle genital organs Significance ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ ━ Overview Broadly speaking, the larvae are quite animal ontogeny morphological and physiological characteristics and developmental stages of embryonic nature. Larvae generally have proprietary organ or temporary structure to accommodate the needs of its own lifestyle, but under the direct form of larvae development does not have this situation. Very few vertebrate urochordate and many invertebrates ontogeny categories are experienced larval stage. Some only a larval stage, such as New York, cap-shaped larvae different animals, animals outside the anus after Bay sea squirt tadpole larvae and larvae. Ontogeny some animals containing multiple larvae; If there are two angles shellfish larvae: trochophora and veliger (Fig. 1 corner two shellfish larvae); false leafy tapeworm larvae have three: hook the ball larvae, larvae and full tail end of the original larvae; sea cucumber has four larval stages: early gastrula type larvae, ear-shaped larvae, larvae and five-barrel release larvae; while mussel larvae actually be broken down into five: trochophora, veliger embryo veliger shell, with the eye point veligers (Fig. 2 mussel larvae stage) and creeping foot veligers (Fig. 3 creeping foot mussel veligers). Arthropods, the number of stages and their larvae molt several relevant. Insect embryos shell nymphs molt in each time period is called the age of the worm. If there are five instar grasshopper period, while insects like mayflies in the environmental impact of the worm may have no peers, were less five, more are up to 27. From an evolutionary perspective, the larvae of species from the category belongs to its own development path in a creation. Some larvae of all animals grouped into two categories: early and late larvae larvae. Early larval germline larvae, also known as dual-sac larvae, cap-like larvae, larvae and spoke wheel trochophora so on. Some forms of these larvae have some basic similarities in their respective categories and the. For example Oligochaeta there and polychaete trochophora similar developmental stages. In contrast, the advanced form of the difference between the different types of larvae appears even with the door as much as the difference between the body. Jellyfish larvae, leeches suck, tapeworms, crustaceans and echinoderms and other types of animals are late larvae. After the larvae develop into adult experiences called metamorphosis. In case there are several larval stages, each morphological changes are associated with changes in lifestyle are closely linked. Sexual and asexual generations generation larvae moon jellyfish larvae appeared in different seasons respectively planktonic life and adhesion of life. Its first form planula intestinal worm-like larvae after attachment, and then develop into a cup on behalf of polyp generation (Figure 4 moon jellyfish larval stage (a)), then that is the transition from the body to the water goblet parent generation. Then goblet somites crack is stacked plate body, followed by the free end of the latter and then falling down a dish of larvae (Figure 5 of moon jellyfish larvae (b)). After a period of planktonic life, disk-shaped body grew to adult animals. Two generations of moon jellyfish larvae into the body and all though the same genotype but different phenotypes, resulting in different patterns. Larval metamorphosis results generally produce small body into a body of individuals, is called larvae. However, some animals in ontogeny, go through a transition period, ie between the larval stage larvae to juveniles. Examples of this are many, such as the absorption of Wag the larvae leech (Fig. 6 suck wag its tail fluke of larvae and post-larvae (larvae or after Wag metacercariae)), long Eyestalk mussel larvae □ row, cherry shrimp larvae, the larvae of shrimp and crab larvae and other big eyes. Features in the larval stage: While most adult organs have begun to grow, but has not yet reached a size and scale body. In addition, some remnants or performance of certain larvae larval ecology organ still exists. The study of history Our history, is the first to be recognized silkworm larvae. BC 16 - before the 12th century between the Yin, the Chinese silkworm Jibei shape carving on shells and the emergence of a hieroglyphic text of "Silkworm" word (part 7 Chinese Yin shells, showing hieroglyphs "Silkworm" word). In the West, 17th century leaves A.van Leeuwenhoek discovered newly hatched Cyclops differs greatly from the adult, beginning after Dwyer study confirmed larvae. Some full of animals such as water fleas larvae and larval megalopa although at 18
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English Expression
n.: caterpillar, grub, larva, nit, nympha, insect larvae, insect in the first stage of its life, after coming out of the egg, baby worms
