Wax scales

Definition

Flattened, plate-like secretions of cuticular wax produced by specialized dermal glands in certain insects, forming protective coverings, waterproofing layers, or structural nest materials. In scale insects (Coccidae), wax scales are extruded as powdery or filamentous coatings that shield the sessile female and her eggs from desiccation, predators, and pesticides; in honey bees (Apis), workers secrete wax scales from abdominal wax glands that are then masticated and molded into comb. The chemical composition varies by species but typically includes long-chain alkanes, esters, and fatty acids.

Etymology

From Old English weax (wax) + Latin scala (ladder, scale), referring to the plate-like form of the secretion.

Example

The red wax scale Ceroplastes rubens extrudes crimson wax plates that completely encase the adult female, while honey bee workers secrete translucent wax scales from sternites 4–7 that they harvest with their hind legs to build hexagonal comb.

Synonyms

• wax plates
• wax flakes

Related Terms

• cuticular wax
• wax gland
• scale insect
• Cerumen
• comb building
• dermal gland
• exocrine secretion
• Integument

Usage Notes

Distinguished from continuous wax films or powders by the discrete, plate-like morphology. In apiculture, 'wax scales' refers specifically to the virgin secretion before manipulation; once chewed and mixed with saliva, it becomes 'beeswax.' In scale insect taxonomy, wax scale morphology (color, shape, arrangement) is diagnostic for species like Ceroplastes.