Lamellate

Definition

Composed of or arranged in thin, plate-like layers or leaf-like plates; having a lamella or lamellae. In arthropod morphology, describes structures—especially antennae, mouthparts, or respiratory organs—that are flattened into overlapping or stacked plate-like segments, often increasing surface area for sensory reception, filtration, or gas exchange.

Etymology

From Latin lamella, diminutive of lamina (thin plate or layer).

Example

Scarab beetles (Scarabaeidae) possess lamellate antennae, in which the terminal segments form a compact club of plate-like lamellae that can be fanned out to detect pheromones or host volatiles.

Synonyms

• lamelliform
• platelike

Related Terms

• Lamella
• Clavate
• pectinate
• serrate
• Flabellate
• lamellate antennae

Usage Notes

Distinguish from pectinate (comb-like with parallel teeth) and flabellate (fan-shaped). Lamellate emphasizes the stacked, plate-like quality rather than simple flattening. In entomology, most commonly applied to antennae (especially scarabaeiform and some chrysomelid beetles) and to the respiratory structures of aquatic arthropods. The term describes structure, not function—lamellate antennae are primarily chemosensory, while lamellate gills serve respiratory roles.