Larva n. : Any young insect from the time that it hatches from the egg until it becomes a pupa, or chrysalis. During this time it usually molts several times, and may change its form or color each time. The larvae of many insects are much like the adults in form and habits, but have no trace of wings, the rudimentary wings appearing only in the pupa stage. In other groups of insects the larvae are totally unlike the parents in structure and habits, and are called caterpillars, grubs, maggots, etc.

Larva n. : The early, immature form of any animal when more or less of a metamorphosis takes place, before the assumption of the mature shape.

Example:
what can I use to kill mosquito Larva in the drainage?

Taxonomy
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Defination from the web:
larva can look completely different from the adult form, for example, a caterpillar differs from a butterfly. Larvae often have ... The larvae of some species can become pubescent and not further develop into the adult form (for example, in some newts). This is a type of neoteny. ...