larva

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larva

 [lahr´vah] (pl. lar´vae) (L.)
1. an independent, immature stage in the life cycle of an animal, in which it is markedly unlike the parent and must undergo changes in form and size to reach the adult stage.
2. something that resembles such an immature animal.
larva cur´rens a rapidly progressive creeping eruption caused by autoinoculation of larvae of Strongyloides stercoralis that migrate to and mature at the anus in intestinal infections with the parasite.
cutaneous larva mi´grans (larva mi´grans) a convoluted threadlike skin eruption that appears to migrate, caused by the burrowing beneath the skin of roundworm larvae, particularly of the species Ancylostoma; similar lesions are caused by the larvae of botflies. Called also creeping eruption.
ocular larva migrans infection of the eye with larvae of the roundworm Toxocara canis or T. cati, which may lodge in the choroid or retina or migrate to the vitreous; on the death of the larvae, a granulomatous inflammation occurs, the lesion varying from a translucent elevation of the retina to massive retinal detachment and pseudoglioma.
visceral larva migrans a condition due to prolonged migration by the skin larvae of animal nematodes in human tissue other than skin; commonly caused by larvae of the roundworms Toxocara canis and T. cati.

lar·va

, pl.

lar·vae

(lar'vă, lar'vē),
1. The wormlike developmental stage or stages of an insect or helminth that are markedly different from the adult and undergo subsequent metamorphosis; a grub, maggot, or caterpillar.
2. The second stage in the life cycle of a tick; the stage that hatches from the egg and, following engorgement, molts into the nymph.
3. The young of fishes or amphibians that often differ in appearance from the adult.
[L. a mask]

larva

(lär′və)
n. pl. lar·vae (-vē) or lar·vas
1.
a. The newly hatched, wingless, often wormlike form of many insects, developing into a pupa in species that undergo complete metamorphosis.
b. The six-legged immature form of a tick or mite.
2. The newly hatched, earliest form of any of various animals that undergo metamorphosis, differing markedly in appearance from the adult.

lar′val adj.

lar·va

, pl. larvae (lahr'vă, -vē)
1. Developmental stage or stages of an insect or helminth.
2. The second stage in the life cycle of a tick; the stage in which it hatches from the egg and, following engorgement, molts into the nymph.
3. The young of fishes or amphibians that often differ in appearance from the adult.
[L. a mask]

larva

(pl. larvae) the preadult form of many animals that is usually morphologically different from the adult, and which in many cases takes up the larger part of the life history. Usually the larva is not sexually mature, but in cases of PAEDOGENESIS, of which the AXOLOTL is an example, breeding may take place at this stage. Often the larva is a dispersal phase, as in many marine invertebrates where larvae occur in the PLANKTON and usually the larva feeds in a different way from the adult and does not compete with it.

Larva

The immature, early form of an organism that at birth or hatching is not like its parent and has to undergo metamorphosis before assuming adult features.
References in periodicals archive ?
Depending on the species, the larval stage lasts from just a few weeks to six years.
An increase in the skewness of the age-at-transition distribution, as seen in the selection model, has also been observed in species that delay metamorphosis, which is the ability of individuals to prolong their larval stage while retaining the capacity to make the larval-juvenile transition (see Pechenik 1986, Cowen 1991).
It has long been speculated that selection pressures or other processes may be very different in planktonic larval stages of benthic invertebrates than in adult populations.
In this study, 6 larval groups from 30 eggs were surveyed and also predator oviposition date, incubation period, larval stages, pupa and adult period were determined (Table I).
externa with respect to the total larval stage, such that, the daily consumption at 30[degrees]C was 4 times greater than at 15[degrees]C.
High concentrations of antibiotics also extended the duration of the larval stage and reduced pupal weight.
They looked at fruit flies in their larval stages because that's when they do most of their growing.
No other caenogastropod is known to possess a free-swimming pre-veliger larval stage, none is known to possess a cuticle, and no other gastropod larva swims with its posterior end forward.
The larval stage then acts as an adult reservoir, so if you can reduce the number of adults before they start laying eggs, there will be lower fly numbers for the following year.
At any time now, the gooseberry sawfly will hatch out from its larval stage underground and go for the gooseberry bushes.
These states collect oyster shells and then replant them in existing reefs to make a suitable habitat where young oysters can settle after floating freely in the water during their larval stage. One state just now catching on to the value of shell recycling is Louisiana, which harvests about 250 million pounds of oysters a year, one-third of the nation's output.