Larval sentence example

larval
  • A third form, Microfilaria diurna, is found in the larval stage in blood, but only in the daytime.
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  • Some members of this order spend the winter in the adult state, others in the " larval " or " pupal " condition.
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  • The parasitic and free-living Nematodes are connected by transitional forms which are free at one stage of their existence and parasitic at another; they may be divided into two classes those that are parasitic in the larval state but free when adult, and those that are free in the larval state but parasitic when adult.
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  • Mermis (in the larval state) is confined to the Invertebrata and Sphaerularia to bees.
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  • Although several species belonging to the second class occasionally enter the bodies of water snails and other animals before reaching their definitive host, they undergo no alteration of form in this intermediate host; the case is different, however, in Filaria medinensis and other forms, in which a free larval is followed by a parasitic existence in two distinct hosts, all the changes being accompanied by a metamorphosis.
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  • They, however, show no periodicity, and are found continuously both by day and by night; and their larval forms are termed Microfilaria perstans.
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  • After the second larval moult, he passes through a passive stage comparable to the pupa-stadium of an b insect, and during this stage, which occurs inside the root, the reproductive organs are perfected.
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  • The sensory cells are slender epithelial cells, often with a cilium or stiff protoplasmic process, and should perhaps be regarded as the only ectoderm-cells which retain the primitive ciliation of the larval ectoderm, otherwise lost in all Hydrozoa.
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  • In Cunina parasitica, however, the ovum develops into an actinula, which buds actinulae as before, but only the daughter-actinulae develop into medusae, while the original, parent-actinula dies off; here, therefore, larval budding has led to a true alternation of generations.
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  • This must not be taken to mean, however, that the medusa is derived from a sessile polyp; it must be regarded as a direct modification of the more ancient free actinula form, without primitively any intervening polyp-stage, such as has been introduced secondarily into the development of the Leptolinae and represents 'a revival, so to speak, of an ancestral form or larval stage, which has taken on a special role in the economy of the species.
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  • The development of the Trachomedusae, so far as it is known, shows an actinula-stage which is either free (larval) or passed over in the egg (foetal) as in Geryonia; in no case does there appear to be a free planula-stage.
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  • The actinula, when free, may multiply by larval budding, but in all cases both the original actinula and all its descendants become converted into medusae, so that there is no alter nation of generations.
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  • Strictly speaking, however, the term ant-lion applies to the larval form, which has been known scientifically for over two hundred years, on account of its peculiar and forbidding appearance and its skilful and unique manner of entrapping prey by means of a pitfall.
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  • As regards growth after hatching, all beetles undergo a "complete" metamorphosis, the wing-rudiments developing beneath the cuticle throughout the larval stages, and a resting pupal stage intervening between the last larval instal1 and the imago.
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  • Such a typically "campodeiform" grub, moving actively about in pursuit of prey, is the one extreme of larval structure to be noticed among the Coleoptera.
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  • Whatever may be the true explanation of stridulating organs in adult beetles, sexual selection can have had nothing to do with the presence of these highly-developed larval structures.
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  • The most interesting of the Heteromera, and perhaps of all the Coleoptera, are some beetles which pass through two or more larval forms in the course of the life-history (hypermetamorphosis).
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  • The first larval stage is the "triungulin," a tiny, active, armoured larva with long legs (each foot with three claws) and cercopods.
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  • After a resting (pseudo-pupal) stage and another larval stage, the pupa is developed.
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  • This is followed by a resting (pseudo-pupal) stage, and thisby two successive larval stages like the grub of a chafer.
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  • The wasps are said to leave the larval or pupal Metoecus unmolested, but they are hostile to the developed beetles, which hasten to leave the nest as soon as possible.
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  • They are vegetable feeders, both in the perfect and larval stages, and are often highly injurious.
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  • Any organism may pass through a series of free-living larval stages.
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  • In the Cyclorrhapha on the other hand, in which the actual pupa is concealed within the hardened larval skin, the imago escapes through a circular orifice formed by pushing off or through the head end of the puparium.
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  • To a geographical distribution of the widest extent, Diptera add a range of habits of the most diversified nature; they are both animal and vegetable feeders, an enormous number of species acting, especially in the larval state, as scavengers in consuming putrescent or decomposing matter of both kinds.
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  • No specialized system of spermathecae, sperm reservoirs, and copulatory apparatus, as in Oligochaeta; development generally through a larval form; reproduction by budding also occurs.
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  • It has been ascertained that the nephridia of Oligochaeta are preceded in the embryo by a pair of delicate and sinuous tubes, also found in the Hirudinea and Polychaeta, which are larval excretory organs.
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  • The insects in the larval or wireworm stage attack the roots of plants, eating them away below the ground.
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  • Larval " weevils " mostly feed on the roots of plants, but some, such as the nut weevil (Balaninus nucum), live as larvae inside fruit.
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  • These two-winged insects attack all kinds of plants, and also animals in their larval stage.
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  • Many of the adults are bloodsuckers (Tabanidae, Culicidae, &c.); others are parasitic in their larval stage (Oestridae, &c.).
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  • Large pits are dug across the line of advance of these great insect armies to stop them when in the larval or wingless stage, and even huge bonfires are lighted to check their flight when adult.
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  • This acts as a larval heart, but ceases to pulsate after a time.
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  • Similar larval nephridia occur in other Gastropoda.
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  • Enderlein and C. Bdrner (1904), and they are very evident in larval may-flies.
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  • Sharp (1898), the marked divergence among the Hexapoda, as regards life-history, is between insects whose wings develop outside the cuticle (Exopterygota) and those whose wings develop inside the cuticle (Endopterygota), becoming visible only when the casting of the last larval cuticle reveals the pupa.
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  • In other insects the imaginal disks are less completely disconnected from the superficies of the larval hypodermis, and may indeed be merely patches thereof.
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  • The process of destruction of the larval tissues was first studied in the forms where metamorphosis is greatest and most abrupt, viz.
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  • Many larval Hexapods might be defined in similar general terms, unlike as they are to their parents in most points of detail.
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  • These differences in larval form depend in part on the surroundings among which the larva finds itself after hatching; the active, armoured grub has to seek food for itself and to fight its own battles, while the soft, defenceless maggot is provided with abundant nourishment.
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  • Among a few of the beetles or Coleoptera, and also in the neuropterous genus Mantispa, are found life-histories in which the earliest instar is campodeiform and the succeeding larval stages eruciform.
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  • These later stages, comprising the greater part of the larval history, are adapted for an inquiline or a parasitic life, where shelter is assured and food abundant, while the short-lived, active condition enables the newly-hatched insect to make its way to the spot favourable for its future development, clinging, for example, in the case of an oil-beetle's larva, to the hairs of a bee as she flies towards her nest.
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  • The presence of the two successive larval forms in the life-history constitutes what is called hypermetamorphosis.
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  • In conjunction with the association mentioned above of the most highly developed imaginal with the most degraded larval structure, it indicates clearly that the active, armoured grub preceded the sluggish soft-skinned caterpillar or maggot in the evolution of the Hexapoda.
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  • After a prolonged aquatic larval and nymphal life-history, the winged insect appears as a sub-imago, whence, after the casting of a delicate cuticle, the true imago emerges.
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  • In the metabolic Hexapoda the resting pupal instar shows externally the wings and other characteristic imaginal organs which have been gradually elaborated beneath the larval cuticle.
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  • Generally the larval is the feeding, the imaginal the breeding, stage of the life-cycle.
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  • Thus a mass or chain of embryos is produced, lying in a common cyst, and developing as their larval host develops.
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  • Young animals always unlike parents, the wing-rudiments developing beneath the larval cuticle and only appearing in a penultimate pupal instar, which takes no food and is usually passive.
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  • Pupa incompletely obtect or free, and enclosed in the hardened cuticle of the last larval instar (puparium).
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  • The caterpillar, or the maggot, is a specialized larval form characteristic of the most highly developed orders, while the campodeiform larva is the starting-point for the more primitive insects.
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  • The Odonata are in many imaginal and larval characters highly specialized; yet they probably arose with the Ephemeroptera as a divergent offshoot of the same primitive isopteroid stock which developed more directly into the living Isoptera, Plecoptera, Dermaptera and Orthoptera.
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  • The antiquity of the Coleoptera is further shown by the great diversity of larval form and habit that has arisen in the order, and the proof afforded by the hypermetamorphic beetles that the campodeiform preceded the eruciform larva has already been emphasized.
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  • Swammerdam, however, showed the presence under the larval cuticle of the pupal structures.
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  • Both Hetero- and Metane- mertini have been more exhaustively studied than the other two groups, the first, as was noticed above, being characterized by peculiar larval forms, the second developing without metamorphosis.
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  • After a series of moults it passes into the second larval stage, somewhat like the parent but differing in having each integumental ring armed with a fringe of backwardly directed short bristles.
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  • The adult stage, for example, has been found in the nasal passages of sheep, goats, horses and even of man, and the larval stage in the pleural and peritoneal cavities of dogs and cats.
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  • All the species are usually infested with Cercariae and Rediae, the larval forms of Trematode parasites of vertebrates.
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  • The larval forms are provided with eye-spots, but no very specialized sense organs are found in the adult.
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  • Either before or just after turning, the mantle develops a larval shell termed the protegulum, and when this is completed the larva is termed the Phylembryo.
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  • A large number of specimens of a species are usually found together, since their only mode of spreading is during the ciliated larval stage, which although it swims vigorously can only cover a few millimetres an hour; still it may be carried some little distance by currents.
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  • He discovered (1823) the Pentacrinus europaeus, and showed that it was the larval form of the Feather-Star Antedon (Comatula).
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  • Mailer's studies on the larval forms of Echinoderms and the discoveries of Vaughan Thompson were appreciated.
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  • But whilst in Trematoda a digestive sac is invariably present except in the sporocyst larval stage, the Cestodes possess no trace of this organ at any stage of their development.
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  • The life-history of Cestodes consists of larval and adult stages, which are usually passed through in different hosts.
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  • Here it develops into a larval, or rather an adolescent form.
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  • The peculiar feature of the larval history of Cestodes is the development in most cases of a cyst or hydatid on the inner wall of which the scolex is formed by invagination.
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  • We have, in fact, a form of larval multiplication that recalls the development of digenetic Trematodes.
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  • The Euculicidae are divided into the Asiphonatae (=Anophelinae), the larvae of which have no respiratory siphon, and the Siphonatae, or forms in which a respiratory siphon is present in the larval state.
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  • In Europe and North America the continued existence of species is ensured by the hibernation of impregnated females, or else the winter is passed in the egg or occasionally in the larval state.
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  • The rapid multiplication that takes place in the larval stage of nearly all endoparasitic forms affects the tissues of the "intermediate" host in which they live.
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  • Von Linstow has indeed suggested that Gyrodactylus is a larval form capable of reproduction by an asexual method.
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  • Here it gives rise by a peculiar process to numerous individuals of a second larval form, and these usually produce a third form from which the minute immature Trematode is developed.
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  • Others again consider that the whole cycle is a metamorphosis which, beginning in the Heterocotylea as a direct development, has become complicated in the Holostomidae by a larval history, and finally in the Malacocotylea has acquired additional complexity by the intercalation of two larval forms, and is thus spread over several generations.
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  • This is followed by the atrophy of many of the larval organs, including the brain, the sense-organ and the ciliated ring.
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  • The alimentary canal persists and revolves in the median plane through an angle of 180°, accompanied by part of the larval vestibule, the space formed by the retra^tion of the oral surface.
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  • Reference has been already made to the various methods of feeding practised by Hymenoptera in the larval stage, and the care taken of or for the young throughout the order leads in many cases to the gathering of such food by the mother or nurse.
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  • In the case of a North American species it is known that this larval life lasts for seventeen years.
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  • Oval or larval irritation also, without doubt, plays an important part in the formation of many galls.
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  • Localities at such altitudes not being, as a rule, suitable for larval life in the water, the young are retained in the uterus, until the completion of the metamorphosis.
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  • - Though concealed within the bivalved shellcover, the mouth-parts are nearly as in the Gymnophylla, but the flexing of the caudal part is in contrast, and the biramous second antennae correspond with what is only a larval character in the other phyllopods.
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  • A parasitic mode of life is also seen in medusae of the genus Cunina during the larval condition, but the habit is abandoned, in this case, when the medusae become adult.
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  • Fissure between the free edge water forms which carry the young in brood-pouches formed by the ctenidia have suppressed this larval phase.
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  • When the larval development is completed the test is cast off, its cells breaking apart and falling to pieces leaving the young animal with a well-developed shell exposed and the internal organs in an advanced state.
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  • The other groups of the old Linnean order (such as lacewing-flies and caddis-flies)--which are hatched as larvae markedly unlike the parent, develop wing-rudiments hidden under the larval cuticle, and only show the wings externally in a resting pupal stage, passing thus through a " complete " metamorphosis and falling into the sub-class Endopterygotawere retained in the order Neuroptera, which thus became much restricted in its extent.
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  • So in some respects is the lifehistory, with a true larval preparatory stage, unlike the parent form, and living an aquatic life, breathing dissolved air by means of a paired series of abdominal tracheal gills.
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  • The larval form thus produced is known as the trochosphere.
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  • It exactly agrees with the larval form of many Chaetopod worms and other Coelomata.
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  • Certain races moult or cast their skin three times during their larval existence, but for the most part the silkworm moults four times - about the sixth, tenth, fifteenth and twenty-third days after hatching.
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  • The growth of the worms during their larval stage is thus stated by Count Dandolo: - When the caterpillars are mature and ready to undergo their transformation into the pupa condition, they cease eating for some time and then begin to ascend the brushwood branches or echelletes provided for them, in which they set about the spinning of their cocoons.
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  • The Trochosphere-hypothesis (2), (3) is based chiefly on the occurrence in certain Polyclad Turbellaria, of a larval form (Miiller's larva) which is comparable to a certain stage (pro-trochula) in the development of the Trochosphere-larva.
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  • The development is direct and there is no larval stage.
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  • Instances of ant-mimicry in this order are sometimes confined to the larval stage.
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  • The early larval stage of the " Lobster Moth " (Stauropus fagi), for example, presents a general resemblance, due to a combination of shape, colour, attitude and movements, to black ants, the swollen head and the caudal disk with its two tentacles representing respectively the abdomen and antenna-bearing head of the model.
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  • Another instance of mimicry affecting the larval form is supplied by the moth Endromis versicolor, the caterpillars of which resemble the inedible larvae of saw-flies.
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  • One species Callistochiton viviparus is viviparous and its ova develop without a larval stage in the maternal oviduct.
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  • Just behind the ciliated ring is a pair of larval eyes which disappear in the adult; these correspond to the cephalic eyes of Lamellibranchs.
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  • In this case there should be only one pair of coelomoducts in the adult, the pair of true nephridia which should also occur being represented by the larval nephridia.
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  • Thus the reflection of a person in a mirror is known as his "image"; in popular usage one person is similarly described as "the very image" of another; so in entomology the term is applied in its Latin form imago to an insect which, having passed through its larval stages, has achieved its full typical development.
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  • E, A male shortly before casting its larval skin.
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  • And yet subsequent discoveries, which followed in rapid succession, have established that Siredon is but the larval form of the salamander Amblystoma, a genus long known from various parts of North America; and Cuvier's conclusions now read much better than they did half a century after they were published.
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  • Before reviewing the history of these discoveries, it is desirable to say a few words of the characters of the axolotl (larval form) and of the Amblystoma (perfect or imago form).
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  • The constant abundance of food, stable amount of water, innumerable hidingplaces in the mud, under the banks, amongst the reeds and roots of the floating islands which are scattered all over them, - all these points are inducements or attractions so great that the creatures remain in their paradise and consequently retain all those larval features which are not directly connected with sexual maturity.
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  • "Plague" was formerly divided into two chief varieties: (1) mild plague, pestis minor, larval plague (Radcliffe), peste fruste, in which the special symptoms are accompanied by little fever or general disturbance; and (2) ordinary epidemic or severe plague, pestis major, in which the general disturbance is very severe.
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  • Various larval stages have been successfully investigated by Sars.
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  • The embryos having then reached the condition of "trochospheres" escape from the mantle cavity and swim about freely near the surface of the water among the multitude of other creatures, larval and adult, which swarm there.
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  • The comparison of the metagenetic type of development, such as that of Aurelia, with the more primitive genera of Scyphomedusae, indicates clearly that the scyphistoma and ephyra are recapitulative larval stages which are represented by the adult forms of primitive genera, making such allowances as are necessary when comparing adult and larval forms. The metagenesis has arisen through the scyphistoma-larva acquiring the power of larval proliferation by budding.
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  • They are absent in the earliest and most primitive B larval forms (nauplius), and appear only late in the course of development, after many of the trunk-limbs are fully formed.
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  • Thus, in the Phyllopoda, the antennal gland develops early and is functional during a great part of the larval life, but it ultimately atrophies, and in the adult (as in most Entomostraca) the maxillary gland is the functional excretory organ.
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  • The majority of the Crustacea are hatched from the egg in a form differing more or less from that of the adult, and pass through a series of free-swimming larval stages.
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  • Further, a definite cuticular membrane is frequently formed and shed at this stage, which corresponds to the nauplius-stage of larval development.
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  • The larval metamorphoses of the Crustacea have attracted much attention, and have been the subject of much discussion in view of their bearing on the phyiogenetic history of the group. In those Crustacea in which the series of larval stages is most complete, the starting-point is the form already mentioned under the name of nauplius.
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  • Most of the larval forms swim freely at the surface of the sea, and many show special adaptations to this habit of life.
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  • The first attempts to reconstruct the genealogical history of the Crustacea started from the assumption that the " theory of recapitulation " could be applied to their larval history.
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  • The various larval forms, especially the nauplius and zoea, were supposed to reproduce, more or less closely, the actual structure of ancestral types.
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  • It is an ancestral larval form, corresponding perhaps to the stages immediately succeeding the trochophore in the development of Annelids, but with some of the later-acquired Crustacean characters superposed upon it.
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  • The Copepoda must have separated themselves very early, though perhaps some of their characters may be persistently larval rather than phylogenetically primitive.
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  • The barnacles and their allies, forming the group Cirripedia or Thyrostraca, sometimes treated as a separate sub-class, are distinguished by being sessile in the adult state, the larval antennules serving as organs of attachment, and the antennae being lost.
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  • The larval forms of the type genus Cerianthus float freely in the sea, and were once considered to belong to a separate genus, Arachnactis.
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  • There is no reason to suppose that the central apical plate of certain free-swimming crinoids has any more to do with the distal foot-plate of the larval Antedon stem than has the so-called centrodorsal of Antedon itself, which is nothing but the compressed proximal end of the stem.
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  • Study of the earliest larval stages has always led to the conclusion that the Echinoderms must have descended from some freely-moving form with a bilateral symmetry, and, connecting this with the ideas just mentioned, we reach the conception that this supposed bilateral ancestor (or Dipleurula) may have become fixed, and may have gradually acquired a radial symmetry in consequence of its sedentary mode of life.
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  • The conception of the Dipleurula derives its chief weight from the fact that it is comparable to the early larval forms of other primitive coelomate animals, such as Balanoglossus, Phoronis, Chaetognatha, Brachiopoda and Bryozoa.
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  • But only slight modifications are required to produce the Tornaria larva of the Enteropneusta and other larvae, including the special type that is inferred from the Dipleurula larval stages of recent forms to have characterized the ancestor of the Echinoderms. We cannot enter here into all the details of comparison between these larval forms; amid much that is hypothetical a few homologies are widely accepted, and the preceding account will show the kind of relation that the Echinoderms bear to other animals, including what are now usually regarded as the ancestors of the Chordata (to which back-boned animals belong), as well as the nature of the evidence that their study has been, or may be, made to yield.
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  • After the formation of an invaginate gastrula the larval form is rapidly acquired.
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  • Most of the praetentacular region and the larval tentacles separate off, being then taken into the alimentary canal, where they are digested.
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  • Since the proboscis is a purely larval organ in this genus, it may be supposed that the coelomic space which properly belongs to it fails to develop, but that the praeoral hood itself is none the less the morphological representative of the proboscis.
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  • Upon hatching, the young, which differ from the adult in possessing long antennae and a pair of powerful fossorial anterior legs, fall to the ground, burrow below the surface, and spend a prolonged subterranean larval existence feeding upon the roots of vegetation.
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  • There is no free living larval stage.
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  • He insists on the value of the upper lip or labrum for generic distinction, and as an aid in affiliating larval forms of different stages to their several species.
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  • He cites Groom's evidence that larvae obtained from the egg readily go through one moult in the aquarium, and the known fact that the last larval stage is.
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  • He considers, then, that by a judicious comparison of larval forms with these two easily determinable stages the poverty of existing information on the subject may be gradually, if laboriously, diminished.
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  • Sarasin (17), whose great work on the development of Ichthyophis is one of the most important recent contributions to our knowledge of the batrachians, Amphiuma is a sort of neotenic Caecilian, a larval form become sexually mature while retaining the branchial respiration.
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  • In some the notochord remains for a long time exposed along the ventral surface, and, owing to the absence of cartilaginous formation around it, disappears without ever becoming invested otherwise than by a thin elastic membrane; it can be easily stripped off below the vertebrae in larval specimens on the point of metamorphosing.
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  • Although there are four branchial arches in all the larval forms of the three orders, and throughout life in the Sirenidae, the perenni vZ.3 Pa.
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  • Even the fossil Stegocephalia underwent metamorphosis, as we know from various larval remains first described as Branchiosaurus.
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  • The larval foodplants are cleavers, hedge bedstraw and primroses.
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  • There is a complex metamorphosis, with three larval stages, followed by a pupal stage enclosed in silken cocoon.
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  • There are usually 7 to 8 larval instars, but the number may vary from 5 to 16.
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  • When they hatch the first instar of the larval stage is very small and makes tiny holes in the leaf.
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  • The 5th larval instar, is followed by the winged imago stage which are 3mm long and brown-black in color.
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  • The adult form is found attached on the inside of human intestines, the larval form is found in the pig.
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  • L3 larvae are invasive and may penetrate human skin, giving rise to cutaneous larval migrans.
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  • Due to the large change from larval to adult form, the insects are said to undergo complete or complex metamorphosis.
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  • These are also very small organisms and strongly resemble the " tadpole " larval stage of the sessile tunicates.
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  • Most species develop through planktonic zoea and other larval stages, but some with direct development.
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  • Manson and Bancroft suggested that the second host of the parasite is the mosquito or gnat, and for a long time it was thought that they were conveyed to man by the mosquito dying after laying her eggs in water, the larval nematodes escaping from her body and being swallowed by man.
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  • Grassi and Noe think that if the cavity of the labium be full of the larval nematodes this bending will burst the tissue, and through the rent the larvae will escape and make their way into the body of the host.
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  • Apart from larval or embryonic forms there are found typically two types of person, as already stated, the polyp and the medusa, each of which may vary independently of the other, since their environment and life-conditions are usually quite different.
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  • The general ectoderm covering the surface of the body has entirely lost the cilia present in the earlier larval stages (planula), and may be naked, or clothed in a cuticle or exoskeleton, the perisarc (ps), which in its simplest condition is a chitinous membrane secreted by the ectoderm.
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  • Brooks [4], who adduces strong evidence for a contrary view, that is to say, for regarding the direct type of development seen in Trachylinae as more primitive, and the metagenesis seen in Leptolinae as a secondary complication introduced into the life-cycle by the acquisition of larval budding.
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  • In Leptolinae the actinula becomes the sessile polyp which has acquired the power of budding and producing individuals either of its own or of a higher rank; it represents a persistent larval stage and remains in a sexually immature condition as a neutral individual, sex being an attribute only of the final stage in the development, namely the medusa.
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  • Thus in Cunina octonaria, the ovum develops into an actinula which buds daughteractinulae; all of them, both parent and offspring, develop into medusae, so that there is no alternation of generations, but only larval multiplication.
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  • It will be seen elsewhere, however, that whatever view may be held as to the origin of metagenesis in Hydromedusae, in the case of Scyphomedusae (q.v.) no other view is possible than that the alternation of generations is the direct result of larval proliferation.
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  • The general proposition as to a parallelism between individual and ancestral development is no doubt indisputable, but extended knowledge of the very different ontogenetic histories of closely allied forms has led us to a much fuller conception of the mode in which stages in embryonic and larval history have been modified in relation to their surroundings, and to a consequent reluctance to attach detailed importance to the embryological argument for evolution.
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  • In the case of certain beetles whose larvae do not find themselves amid appropriate food from the moment of hatching, but have to migrate in search of it, an early larval stage, with legs, is followed by later sluggish stages in which legs have disappeared, furnishing examples of what is called hypermetamorphosis.
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  • As might be expected, degeneration in larval structure is correlated with a concealed habit of life.
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  • Next, any organism may pass through a series of free-living larval stages, so that the new organism at first resembles its.
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  • (See Embryology, Larval Forms. and Reproduction.) Finally, the conception of homogenesis does not exclude the differences between parent and offspring that continually occur, forming the material for the slow alteration of stocks in the course of evolution (see Variation And Selection).
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  • The pupa either shows the appendages of the perfect insect, though these are encased in a sheath and adherent to the body, or else it is entirely concealed within the hardened and contracted larval integument, which forms a barrel-shaped protecting capsule or puparium.
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  • - A, B, C. Three views of Limnaeus stagnalis, in order to show the persistence of the larval velar area v, as the circum-oral lobes of the adult.
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  • Wagner made his classical observations on the production of larvae from unfertilized eggs developed in the precociouslyformed ovaries of a larval gall-midge (Cecidomyid), and subsequent observers have confirmed his results by studies on insects of the same family and of the related Chironomidae.
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  • Their structure is eminently that of degenerate forms. Many frequent growths of coralline Algae and hydroid polyps, upon the juices of which they feed, and in some cases a species of gall is produced in hydroids by the penetration of the larval Pantopod into the tissues of the polyp.
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  • The Monozoa are unsegmented; the Ligulidce have segmented gonads and gonopores without any trace of somatic metamerization except secondary excretory pores in addition to the usual terminal one; the remaining Cestodes are unisegmental only in their larval stage, and all of them show in their later stages repetition of the reproductive organs and of the musculature.
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  • These endoparasites have a peculiar larval development, the results of which are to increase their numbers and enhance the opportunity of their gaining the necessarily remote station in some fresh individual host.
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  • The alimentary canal persists and revolves in the median plane through an angle of 180°, accompanied by part of the larval vestibule, the space formed by the retra^tion of the oral surface.
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  • As in the case of Cyphonautes, the larval organs degenerate and the larva becomes the ancestrula from which a polypide is developed as a bud.
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  • 2 Often the gall bears no visible resemblance to the structures out of which it is developed; commonly, however, outside the larval chamber, or gall proper, and giving to the gall its distinctive form, are to be detected certain more or less modified special organs of the plant.
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  • The transformations from the larval state are completed within the gall, out of which the imago, or perfect insect, tunnels its way, - usually in autumn, though sometimes, as has been observed of some individuals of Cynips Kollari, after hibernation.
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  • The adult, larval and pupa stages are under the ground and out of view.
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  • Larval Therapy This can be a useful treatment, especially for sloughing open wounds, which are infected with MRSA.
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  • Studies have indicated that inhibited 3rd stage small strongyle larvae represent 50% of the total larval population in the horse.
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  • They look like tunicate larvae but retain this larval shape when they become adult.
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  • Biology The female beetle lays the whitish eggs in or on a suitable larval food.
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  • There are three stages of development within the larval stage.
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  • The eggs quickly progress to the larval stage, where they continue their development by eating microscopic debris including dander, feces, and dead skin cells.
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  • The U.S.Department of Agriculture's pamphlet on Japanese beetle control recommends several pesticides to kill Japanese beetles at their adult and larval stages.
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  • In other northern climates, they're still in the larval stage, biding their time.
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  • In the summer, the larval ticks hatch from eggs laid in the ground and feed by attaching themselves to small animals and birds.
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  • Description: Battra has both larval and adult forms like Mothra.
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  • Description: Like many of Godzilla's enemies, Hedorah went through multiple incarnations from larval form, sea form, landform and air form.
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  • Description: Mothra was a gigantic moth who began in larval form, spun a cocoon and was reborn.
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  • The most important Hymenopterous pests are the sawflies or Tenthredinidae, which in their larval stage attack almost all vegetation.
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