larva (redirected from Larval stage)

larva /lar·va/ (lahr´vah) pl. lar´vae   [L.] an independent, motile, sometimes feeding, developmental stage in the life history of an animal.

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larva cur´rens  a variant of larva migrans caused by Strongyloides stercoralis, in which the progression of the linear lesion is much more rapid.

cutaneous larva migrans , larva mi´grans creeping eruption; a convoluted threadlike pruritic, erythematous, papular or vesicular skin eruption that appears to migrate, caused by burrowing beneath the skin of roundworm larvae, particularly Ancylostoma larvae . Also applied to similar lesions caused by other parasites.

ocular larva migrans  infection of the eye with larvae of 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 of nematode larvae in human tissue other than skin; commonly caused by the larvae of Toxocara canis or T. cati, which do not complete their life cycle in humans.

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lar·va (lärv)

n. pl. lar·vas or lar·vae (-v)

1. The newly hatched, wingless, often wormlike form of many insects before metamorphosis.

2. The newly hatched, earliest stage of any of various animals that undergo metamorphosis, differing markedly in form and appearance from the adult.

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larval adj.

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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.

Mentioned in: Antihelminthic Drugs, Hookworm Disease, Trichinosis

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larva

[lär′və] pl. larvae

Etymology: L, specter

the early immature form of an animal, which undergoes metamorphosis to an adult form. It is one of the growth stages for some insects; the state between the egg and the pupolarval stage is the feeding stage in the growth process. larval, adj.

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larva

an independent, immature stage in a life cycle in which the stage is unlike the parent and must undergo changes in form and size to reach the adult stage. There may be one or several, three is common, larval stages in the one life cycle. In fish larvae are also called fry.

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larva currens

a variant of larva migrans caused by Strongyloides stercoralis, in which the linear progress of the lesions is much more rapid.

cutaneous larva migrans

creeping eruption; a convoluted, thread-like skin eruption in humans and other species which appears to migrate; caused by the burrowing beneath the skin of roundworm larvae, particularly Ancylostoma, Strongyloides and Gnathostoma spp. A. braziliense, A. caninum, B. phlebotomum can cause the disease.

ocular larva migrans

infection of the eye with the 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 of larvae of animal nematodes in human tissues other than skin, commonly caused by larvae of the roundworms Toxocara canis and T. cati.