Seed beetles

Definition

Common name for beetles of the subfamily Bruchinae (family Chrysomelidae), a group of small beetles whose larvae develop inside seeds and other dried plant material. Adults are typically compact, short-snouted beetles that do not possess the elongated rostrum characteristic of true weevils (Curculionidae), despite the misleading vernacular 'bean weevil.' The subfamily comprises approximately 1,650 species worldwide and includes significant agricultural pests of legumes and other stored products.

Etymology

From the larval habit of developing within seeds; 'beetle' from Old English bitela (biting insect).

Example

The cowpea weevil Callosobruchus maculatus, a seed beetle notorious in stored-product entomology, completes its entire larval development inside a single cowpea seed, emerging as an adult through a neat circular exit hole.

Synonyms

• Bean weevils
• Bruchines

Related Terms

• Bruchinae
• Chrysomelidae
• Stored-product entomology
• granivory
• True weevils
• Curculionidae
• Legume pests

Usage Notes

The name 'bean weevil' is entrenched in agriculture but taxonomically misleading—seed beetles lack the defining rostrum of true weevils and belong to Chrysomelidae, not Curculionidae. Specialists increasingly prefer 'seed beetle' or 'bruchine' to avoid confusion. The subfamily was historically treated as family Bruchidae, and older literature may reflect this rank.