Planidium

Pronunciation: /plan-ID-ee-um/

Category: Anatomy

Singular: Planidium

Plural: Planidia

Definition

The first instar larva of certain insects, especially parasitic wasps (Hymenoptera) and beetles (Coleoptera), that undergo hypermetamorphosis, characterized by being legged, highly mobile, and often flattened.

Etymology

From Latin 'plana', meaning 'flat'.

Example

The planidium stage of certain parasitic beetles is highly mobile and searches for a suitable host.

Related Terms

Hypermetamorphosis
Diptera
Hymenoptera
Coleoptera

Usage Notes

Planidia are highly specialized for finding hosts and are an essential part of the life cycle of insects that undergo hypermetamorphosis.