planidium

Etymology
From the

Noun

 * 1) The first-instar larva of any species of parasitoidal insect in which the life cycle is an example of hypermetamorphosis; so called because the first instar wanders in search of the host, whereas the rest of the instars remain stationary while they feed until they pupate.

Synonyms

 * triungulin

Derived terms

 * planidiform
 * planidiform