Shield bugs

Definition

Common name for insects of the family Pentatomidae (Hemiptera), referring to the broad, shield-shaped scutellum that typically covers most of the abdomen and wings in repose. The name is sometimes applied more broadly to other Pentatomoidea families (e.g., Acanthosomatidae, Scutelleridae), though specialists generally reserve it for Pentatomidae. Most species are phytophagous and include major agricultural pests, though predatory members of subfamily Asopinae are used in biocontrol.

Etymology

From the characteristic shield-like body shape formed by the enlarged scutellum.

Example

The brown marmorated stink bug (Halyomorpha halys), a pentatomid shield bug native to East Asia, has become a destructive invasive pest of orchard and row crops in North America and Europe.

Synonyms

• Stink bugs

Related Terms

• Pentatomidae
• scutellum
• Hemiptera
• Heteroptera
• stink bug
• Acanthosomatidae
• Asopinae
• Phytophagy

Usage Notes

In strict usage, refers specifically to Pentatomidae; broader application to other shield-shaped Hemiptera is common in field guides but taxonomically imprecise. The synonym "stink bugs" is shared with many non-pentatomid families and is especially ambiguous in North America. Contrast with "burrower bugs" (Cydnidae) and "jewel bugs" (Scutelleridae), which have similar body plans but different scutellum proportions and biology.