Kermesidae

Definition

A family of scale insects in the superfamily Coccoidea (order Hemiptera), commonly called gall-like scales or kermes scales. These sessile, often gall-inducing insects are characterized by the female's sac-like, waxy covering and reduced morphology. The family comprises approximately 100 species in 10 genera distributed primarily in the Nearctic, Palaearctic, and Indomalayan realms. The type genus Kermes has been historically exploited for kermes dye, a crimson pigment derived from dried females that was economically important in textile production before the advent of synthetic and cochineal dyes.

Etymology

From the type genus Kermes (from Arabic/Persian qirmiz, 'red dye, crimson') + family suffix -idae.

Example

Kermes vermilio, the scarlet kermes, infests oak species (Quercus spp.) in the Mediterranean region and was the primary source of kermes dye in European commerce; females are concealed within galls on twigs and can be distinguished from related Coccidae by their more pronounced gall association and the structure of the anal ring.

Synonyms

• gall-like scales

Related Terms

• Coccoidea
• Hemiptera
• scale insect
• Kermes
• cochineal
• gall
• Coccidae
• Dactylopiidae
• Diaspididae

Usage Notes

Kermesidae is sometimes treated as a subfamily (Kermesinae) within Coccidae in older classifications; modern molecular phylogenetics supports family status. Distinguished from the superficially similar Dactylopiidae (cochineal insects) by host association (primarily oaks vs. cacti), geographic distribution, and morphological details of the anal apparatus. The common name 'gall-like scales' reflects frequent but not universal gall induction; some species are merely pit-forming or free-living on bark. In economic entomology literature, 'kermes' without qualification usually refers to the dye or the genus Kermes specifically, not the entire family.