The early stages of the free-swimming larvaehave not been described, but I have myself observed in the case of Ophiothrix fragilis that the segmentation is uniform, and is followed by the normal invagination.
In such cases, as a rule, the encystment takes place in the host of the Redia or Sporocyst, but the tailless larvae sometimes pass through a free stage like the Cercariae.
These larvae on leaving the egg have an oval form, and are uniformly covered by cilia.
The larvae of these forms are very differently constituted to those of Sycandra.
The larvae composing it at first sight appear to have but little in common with the larvae hitherto described.
The cilia are developed on special cells which may be arranged in transverse bands in the same way as in the larvae of many Chaetopods, but are not, in the larvae at present known, distributed uniformly.
The monotrochae or cephalotrochae are larvaein which only a single prae-oral ring is developed (fig.
The larvae of all these forms undergo more or less of a metamorphosis, but the accounts of their development are not easily reconciled.
The larvae to the number of eight to twenty develop in a peculiar pouch on the dorsal surface of the body.
The innervation of these appendages in the larvae of Pycnogonida requires further investigation.
A, is the type from which the various forms of Echinoderm larvae start.
The larvaein the blood do not undergo a further development, and unless transported to an intermediate host die before very long.
The cysts or envelopes in which the parasites live are dissolved by the digestive fluids and the young larvae which are liberated develop in the small intestine to the adult worm, usually within two days.
This relatively simple means of destroying the larvae is a more certain as well as less expensive method of preventing infection than is the laborious microscopic examination of the tissues of every slaughtered hog.
The most ancient progenitors in the kingdom of the Vertebrata, at which we are able to obtain an obscure glance, apparently consisted of a group of marine animals,[281] resembling the larvae of existing Ascidians.
Female bees have a special apparatus for collecting and carrying pollen, and their ovipositor is modified into a sting for the defence of their larvae and the community.
Their larvae somewhat resemble tadpoles in shape,[275] and have the power of swimming freely about.
It is a more valid objection that the larvae shine, and in some species brilliantly: Fritz Mueller informs me that the most luminous insect which he ever beheld in Brazil, was the larva of some beetle.
Sticks moved to right and left; hairy balls lay and rolled over one another; there was a twisting and turning of larvae in all directions.
Down in the deep water where the black horse-leeches pushed their way along, and monster larvae with bent back and open jaws stood motionless, watching for prey among the refuse, grew the oddest water-forests.
A genus of four-winged insects, the larvae of which, called caddis-worms, are used by anglers as a bait.
In the cells of these three species, I see the number of larvae put out to nurse vary in so elastic a fashion that I must abandon all idea of proportionate adjustment.
Then, in spite of apparently insurmountable obstacles, the mortar wall and the tent without an opening, the flesh-eating larvae appeared in the secret retreat and are now glutting themselves on the sleeper.
Moreover, as with the larvae of the wasp, it is some time before they are suffocated by the petroleum fumes; and so most of them are sure to hatch.
If fortune be at all propitious, as it always is to the persevering, we shall end by finding that the cocoons harbor two larvae together, one more or less faded in appearance, the other fresh and plump.
I sprinkle on the surface of the combs some larvae that have lately left the egg.
Perhaps, aided by easy roads, they had reached their fostering larvae long before the completion of their first babyhood, the end of which they were spending before my eyes, with no apparent purpose, in exploring their provisions.
She is at once recognized as a stranger and attacked and slaughtered with the same vigor as the larvae of the Hylotoma sawfly and the Saperda beetle, neither of which bears any outward resemblance to the larva of the wasps.
The larvae resist longer and do not die until the second day.
After witnessing flesh eating larvae at hundreds and hundreds of meals, I suddenly find myself confronted with a manner of eating that bears no relation to anything which I have seen before.
And so the nonparalyzed larvae are attacked during the period of the nymphosis.
My notes mention fifty-four larvae in the cell of a masked Anthophora (Anthophora personata).
But if the gauzy-winged fly is one of the loved likes of the trout, the former has its day, for none of the larvae of water beetles is so destructive to spawn and fry as this.
These it rapidly turns over with its bill, searching for thelarvae of water flies and gauzy-winged ephemerae.
The larvae of the glow-worm is capable of emitting light, but not to be compared to that of the developed insect.
Even water beetles and their larvae must, on account of their numbers and voracity, come within the reckoning, and among the most destructive of these are water-shrimps and the larvae of the dragon-fly.
Canestrini, on the destruction of its larvae by wasps, i.
This animal seems to have been more like the larvae of our existing marine Ascidians than any other known form.
The larvae of most crustaceans, at corresponding stages of development, closely resemble each other, however different the adults may become; and so it is with very many other animals.
Cases can even be given of the larvae of allied species, or groups of species, differing more from each other than do the adults.
These larvae are hatched in the nests of bees; and when the male bees emerge from their burrows, in the spring, which they do before the females, the larvae spring on them, and afterwards crawl on to the females while paired with the males.
It may be worth notice that when Wagner's remarkable discovery was first announced, I was asked how was it possible to account for the larvae of this fly having acquired the power of a sexual reproduction.
To refer once again to cirripedes: the larvae in the first stage have three pairs of locomotive organs, a simple single eye, and a probosciformed mouth, with which they feed largely, for they increase much in size.
One of the most obvious real cases is, that variations of structure arising in the young or larvae naturally tend to affect the structure of the mature animal.
As soon as the female bee deposits her eggs on the surface of the honey stored in the cells, the larvae of the Sitaris leap on the eggs and devour them.
So again the two main divisions of cirripedes, the pedunculated and sessile, though differing widely in external appearance, have larvae in all their stages barely distinguishable.
As soon as the larvae have completed their development they pupate.
The larvae hatch and begin their work by burrowing across the cambium at right angles to the egg galleries.
As these larvae were for the most part found simply over a considerable time it follows that they are the offspring of different females and represent the relative proportions of the three forms in the general population.
The larvaeof these two species are conspicuously coloured black and red with spiny tubercles.
The larvae also afford characters by which some of the families may be distinguished--those of the Papilionidae for example having a process on the back which can be extruded or retracted.
One of these sections he termed the Pharmacophagus or "poison-eating" {26} group owing to the fact that the larvae feed on the poisonous climbing plants of the genus Aristolochia.
Parasites The ectoparasites of the racer are chiefly chiggers, the parasitic larvae of mites.
Soft-bodied larvae of insects and other invertebrates conceivably could be likewise completely digested, but such occurrences must be rare, as most of the invertebrates known to be eaten have the mouth parts, at least, heavily chitinized.
The form value of this stage nearly corresponds with that which the larvae of the simple Sea-squirts possess at the time when they show the beginning of the dorsal marrow and spinal rod.
The freely swimming larvae of the Ascidians (Plate XII.
There must, however, have existed ancestors of Man in the early Primordial period which possessed the form value of these ciliated larvae (Planaea, p.
One contained adult and larvae of moths and butterflies; the other contained 68 percent insects and 32 percent fruits.
The birds stay as long as there are abundant larvae (Dennis 1967).
Beetle larvae (16 percent) and ants made up an important part of the year-round diet.
Dragonfly and damselfly larvae are important in the diet of ducklings in all areas (Erskine 1971).
The larvae or tadpoles of the Batrachians are capable of reproducing lost members, but not so the adults.
Insects sometimes have their antennae or legs in a monstrous condition, the larvae of which do not possess either antennae or legs; and in these cases, as Quatrefages (22/52.
Mature insects have no power of regrowth, excepting in one order, whilst the larvae of many kinds have this power.
So, again, the germ-balls in the larvae of Cecidomyia are said by Leuckart (27/9.
Salamanders correspond in development with the tadpoles or larvae of the tailless Batrachians, and both possess to a large extent the power of regrowth; but not so the mature tailless Batrachians.
It is probable that certain modifications in the larvae of insects would affect the structure of the mature insects.
The number of moults through which thelarvae of silk-moths pass, varies.
This animal seems to have been more like the larvae of our existing marine Ascidians then any other form known.
Some of them were giants in their way, being probably seven inches in expanse of wing, and their larvae must have been choice morsels to the ganoid fishes, and would have afforded abundant bait had there been anglers in those days.
The waters subside, and the trees rapidly decay, the larvae of wood-boring insects perhaps aiding in the process, as they now do in the American woods.
But the larvae of the Ecaudata are mainly herbivorous and the digestive tract is accordingly extremely elongate and coiled up like the spring of a watch.
They are now considered as arrested larvae descended from the latter.
These carpenter bees are exceedingly destructive, as they bore holes in beams and posts, in which they lay their eggs, the larvaeof which when hatched greedily feed upon the timber.
The larvae of Syrphus Pyrastri according to De Geer eat no other Aphis but that of the rose[708].
The larvae of two species of moth (Galleria Cereana, and Mellonella) exhibit equal hardihood with equal impunity.
But when larvae of any kind have attained their full size, and are about to pass into the pupa state, they can exist for a long period without any further supply.
Many of these are merely cylindrical burrows in the ground, as those formed by the larvae of field-crickets, Cicindelae and Ephemerae.
Wax is the principal substance employed in the habitations of the larvae before mentioned[805], occasionally so destructive to bee-hives.
These are thelarvae of Arctia chrysorrhoea, and the web which contains them is spun by their united labour for the protection of the common society.
The whole of the silk produced in Europe, and the greater proportion of that manufactured in China, is obtained from the common silk-worm; but in India considerable quantities are procured from the cocoons of the larvae of other moths.
Canestrini, on the destruction of its larvae by wasps; difference of size of the male and female cocoons of the; pairing of the.
Ascidia, affinity of the lancelet to; tad-pole likelarvae of.
This animal seems to have been more like the larvae of the existing marine Ascidians than any other known form.
The females of most bees are provided with a special apparatus for collecting and carrying pollen, and their ovipositor is modified into a sting for the defence of the larvae and the community.
The male is feebly luminous, as are the larvaeand even the eggs.
With insects the female larvae are often larger than those of the males, and would consequently be more likely to be devoured.
Smith has reared hundreds of specimens from larvae of all sizes, but has never reared a single male; on the other hand, Curtis says (86.
The process never stops with any of the larvae intervening between the fertile parents at the beginning, and the fertile individuals at the end of the series.
The eggs are somewhat flattened, about one-tenth of an inch long, pale in color, and are deposited by the female in small patches upon a large variety of plants, since there are about fifty of these upon which the larvae will feed.
Dead larvae are sometimes found in cocoons which are practically of a single thickness; there being no space between the outer and inner layers.
The hollow skins of the larvae found in such cocoons clearly show that this unusual cocoon is due to the influence of parasites upon the larva.
The leaves upon which the larvae feed may have long or short petioles.
The larvae have voracious appetites, devour many leaves and grow at a correspondingly rapid rate.
The eggs usually hatch in about a week or ten days, the young larvae being very different in appearance from the mature ones.
A singular account has been given of how these larvae have overcome the difficulties associated with feeding upon long-petioled leaves.
Promethea has from three to five of these moults, the number being influenced apparently by climate, since southern larvae have more moults than northern ones.
Although a variety of parasites which prey upon these larvae is not large, they are very numerous in individuals, and it is to this cause that only a small per cent of the larvae ever produce moths.
The larvae seem normally to make three varieties of cocoons; one kind is very loosely constructed, much larger than the ordinary form and not attached to a twig, but found in the grass or in shrubs near the ground.
Scalpellum: my chief examination of these larvae has been confined to those of Scalpellum vulgare; but I saw them in all the other genera.
Spence Bate, of Swansea, has made other detailed observations and drawings of the larvae of five species in this same early stage, and has most kindly permitted me to quote from his unpublished paper[7].
The larvaein this final stage, in most of the genera, have increased many times in size since their exclusion from the egg; for instance, in Lepas australis, from .
There were distinct remnants of two great reddish-brown eyes, showing that in this respect the larvae of the male in their last stage of development, are characterised like the larvae of other Lepadidae.
In the sack with these two males, there were certainly four, I believe five, larvae, which in every main point of structure resembled the larvae of other pedunculated Cirripedes.
The larvae hatch in a few days and tunnel through the pith of the shoots seriously injuring and stunting their growth while the infested nuts soon fall from the tree.
The larvae complete their growth in four or five weeks when they enter the ground to pupate.
Clean cultivation will, of course, destroy manylarvae that hibernate under trash.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "larvae" in a variety of sentences. We hope that you will now be able to make sentences using this word.
