Asterolecaniidae

Definition

A family of scale insects (Hemiptera: Coccoidea) commonly known as pit scales, characterized by the formation of depressions or pits in host plant tissues where the insects settle and feed, often resulting in shoot distortion, gall-like swellings, or stem pitting. The family comprises approximately 25 genera and 243 described species with greatest diversity in the Northern Hemisphere; members are frequently pests of oaks (Quercus), bamboos, and ornamental woody plants.

Etymology

From Greek aster- (star) + lekanē (dish/basin), referring to the star-shaped or basin-like depressions formed on host plants.

Example

The oak pit scale Asterolecanium quercicola (Asterolecaniidae) induces characteristic star-shaped pits on twigs of Quercus species, with heavy infestations causing branch dieback in urban oak plantings.

Synonyms

• pit scales

Related Terms

• Coccoidea
• Diaspididae
• Coccidae
• scale insect
• plant gall
• phloem feeder
• Berlese

Usage Notes

Distinguished from armored scales (Diaspididae) by the absence of a separable waxy test and from soft scales (Coccidae) by the pit-forming habit and more reduced wax covering. The family-level classification has undergone revision; some authorities formerly placed pit scales within Coccidae or as a separate superfamily. Identification to genus requires examination of adult female morphology, particularly the arrangement of tubular ducts and spiracles.